{"title":"Light Pollution, CLS and Nebula Filters for Telescopes","description":"\u003cp\u003e\u003cstrong\u003eLight pollution filters\u003c\/strong\u003e give you the ability to enhance your observations and astrophotography by minimizing the effects of artificial lights. \u003cstrong\u003eCLS filters\u003c\/strong\u003e, also known as \u003cstrong\u003eCity Light Suppression or contrast filters\u003c\/strong\u003e, reduce unwanted light from street lamps and other urban sources while allowing the wavelengths characteristic of deep-sky objects to pass through.\u003c\/p\u003e\n\u003cp\u003eBy using these filters, you can observe nebulae, galaxies, and other celestial objects with greater detail and improved contrast. \u003cstrong\u003eNebula filters\u003c\/strong\u003e, specially designed for certain wavelengths, highlight the fine structures of planetary and diffuse nebulae, producing sharper and more striking images.\u003c\/p\u003e\n\u003cp\u003eThese \u003ca href=\"https:\/\/istronomyplus.com\/collections\/filters\" target=\"_self\" title=\"\"\u003efilters\u003c\/a\u003e are compatible with various types of telescopes and can be used for both visual observing and astrophotography. They are easy to install and can transform an observation in a light-polluted environment into a clearer and richer experience.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eChoosing light pollution filters from Astronomy Plus\u003c\/strong\u003e allows you to get the most out of your equipment and explore the deep sky with better precision and enhanced visual comfort, even under partially lit skies.\u003c\/p\u003e","products":[{"product_id":"chroma-loglow-light-pollution-filter","title":"Chroma LoGlow Light Pollution Filter","description":"\u003ch2\u003eChroma LoGlow Light Pollution Filter\u003c\/h2\u003e\n\u003cp\u003eThe Chroma LoGlow Light Pollution Filter blocks common spectral lines from lighting sources. This filter provides balanced color for the visible spectrum while blocking most emission from metal-halide and vapor lamp sources which together contribute to sky glow.\u003c\/p\u003e\n\u003cp\u003eChroma Technology is an employee-owned company. They specialize in the design and manufacture of sputtered optical filters and coatings for applications that require the greatest precision in color separation, optical quality and signal purity. Their astronomical filters are used worldwide in research and amateur applications. They are as comfortable designing and manufacturing custom filters as they are for their catalog items.\u003c\/p\u003e\n\u003cp\u003eHighly precise and accurate, the passbands of these filters remain spectrally stable and do not drift in response to extreme temperature fluctuations or changes in humidity. All filters may be used with apertures of f\/4 or smaller. Chroma provides custom coating services for more demanding imaging applications requiring larger apertures such as f\/3 or f\/2. They also can provide larger sizes and unique passbands upon request.\u003c\/p\u003e\n\u003cp\u003eChroma manufactures the highest quality astronomy filters with durable, sputtered hard coatings using single substrates of the best glass, eliminating the need for laminations. All primary filter coatings are applied on the front surface and anti-reflection coatings on the rear surface to prevent ghosting and to maximize transmission.\u003c\/p\u003e\n\u003cp\u003eAll filters are manufactured in Vermont.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAdditional Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eBlocks common spectral lines from lighting sources. This filter provides balanced color for the visible spectrum while blocking most emission from metal-halide and vapor lamp sources which together contribute to sky glow.\u003c\/li\u003e\n\u003cli\u003eExtremely durable coatings withstand humidity changes and extreme temperature fluxes and remain spectrally accurate\u003cbr\u003ein CWL and band pass adherence\u003c\/li\u003e\n\u003cli\u003eNo reflections leading to image distortions or “back reflections”\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eT: ≥ 94% avg. across visible passbands\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eBlocking ≥ OD1.4@ metal-halide and vapor lamp lines\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eDurable sputter coatings\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eParallelism: \u0026lt;30 arcsec\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eThickness: 3.0 +\/-0.05mm\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eFilters designed for use with CCD and for f\/4.0 or slower\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eTransmitted wavefront better than 0.25 waves\/inch\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eIn the Box\u003c\/h3\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\u003cspan\u003eChroma LoGlow Filter of the chosen size\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eWarranty \u0026amp; Manuals\u003c\/h3\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.chroma.com\/sites\/default\/files\/Astronomy-Brochure-2022.pdf\" data-mce-href=\"https:\/\/www.chroma.com\/sites\/default\/files\/Astronomy-Brochure-2022.pdf\" target=\"_blank\"\u003eChroma Astronomy Filters \u0026amp; Sets Brochure\u003c\/a\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eLifetime Warranty for Sputtered Catalog Filters\u003c\/p\u003e","brand":"Chroma","offers":[{"title":"1.25″ round mounted","offer_id":43652072734949,"sku":"CHR-27030-1.25","price":385.0,"currency_code":"CAD","in_stock":true},{"title":"2″ round mounted","offer_id":43652072767717,"sku":"CHR-27030-2","price":707.0,"currency_code":"CAD","in_stock":true},{"title":"31mm round unmounted","offer_id":43652072800485,"sku":"CHR-27030-31","price":385.0,"currency_code":"CAD","in_stock":true},{"title":"36mm round unmounted","offer_id":43652072833253,"sku":"CHR-27030-36","price":497.0,"currency_code":"CAD","in_stock":true},{"title":"50mm round unmounted","offer_id":43652072866021,"sku":"CHR-27030-50","price":637.0,"currency_code":"CAD","in_stock":true},{"title":"50mm x 50mm square unmounted","offer_id":43652072898789,"sku":"CHR-27030-50S","price":770.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/chroma-loglow-light-pollution-filter-astronomy-plus_aeb18fe3-18df-456e-bc22-5af94ab9f898.png?v=1690483381"},{"product_id":"astronomik-oiii-visual-filter","title":"Astronomik OIII Visual Filter","description":"\u003ch2\u003eAstronomik OIII Visual Filter\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eFrom the start, the Astronomik OIII Visual Filter has been very specifically designed for the visual observation of gaseous and planetary nebulae. The extremely narrow pass band of the two OIII lines brings a substantial contrast gain to these lines even under best observation conditions. On faint super nova remnants and faint planetary nebulae the Astronomik OIIIfilter will often make the difference as to whether the object can bee seen or not!\u003c\/strong\u003e The optimal aperture ratio for the use of the filter is 1:3 to 1:15 with apertures of more than 6\" (150mm). Transmission losses and chromatic distortions, which arise with other filters, occur with Astronomik OIII filters only when extremely bright aperture ratios of 1:3 and more come into play. The Astronomik OIII filters thus can expand the view of dispersed objects, generally speaking, to the whole visual field of view of the eyepiece and are not limited to only the center of the eyepiece.\u003c\/p\u003e\n\u003ch4\u003eMain use\u003c\/h4\u003e\n\u003cp\u003eSince enough light must be available to make use of the OIII filter it is best to use this filter with apertures of more than 6\" (150mm). Smaller instruments do not gather enough light for meaningful and satisfying astronomical work. However, please note: Many experienced Deep Sky observers, with apertures of more than 10\" (250mm), prefer using the OIII filter instead of the more versatile UHC filter. Due to the high optical quality of the Astronomik OIII filter substrate you will see the same needle-sharp stars as you would from your regular telescope. [caption id=\"attachment_3936\" align=\"aligncenter\" width=\"592\"]\u003c\/p\u003e\n\u003ch4\u003eSuitability\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eVisual observation (dark skies): Very good, huge contrast enhancement at O III-emission nebulas\u003c\/li\u003e\n\u003cli\u003eVisual observation (urban skies): Very good, huge contrast enhancement at O III-emission nebulas\u003c\/li\u003e\n\u003cli\u003eFilm photography: It depends, very long exposure time\u003c\/li\u003e\n\u003cli\u003eCCD photography: Good, when used with an additional IR-block-filter\u003c\/li\u003e\n\u003cli\u003eDSLR photography (original): Very good, huge contrast enhancement at O III-emission nebulas\u003c\/li\u003e\n\u003cli\u003eDSLR photography (astro modified): Very good, huge contrast enhancement at O III-emission nebulas\u003c\/li\u003e\n\u003cli\u003eDSLR photography (MC modified): Good, when used with an additional IR-block-filter\u003c\/li\u003e\n\u003cli\u003eWebcam \/ Video (Planets): Unsuitable\u003c\/li\u003e\n\u003cli\u003eWebcam \/ Video (Deep Sky): Reasonable, if light pollution is a big problem and OIII Objects are beeing observed\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical Specification\u003c\/h3\u003e\n\u003cp\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/astronomik_oiii_trans_480x480.png?v=1687450098\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cspan style=\"color: #ff8000;\"\u003eThe major emission lines of artifical light pollution: | Hg 435,8nm | Hg 546,1nm | Hg 577,0nm | Hg 578,1nm | | Na 589,0nm | Na 589,6nm | Na 615,4nm | Na 616,1nm |\u003c\/span\u003e \u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003cspan style=\"color: #20a652;\"\u003eThe major emission lines of nebulas: H-β 486,1nm | OIII 495,9nm | OIII 500,7nm | H-α 656,3nm\u003c\/span\u003e\u003c\/p\u003e\n\u003ch4\u003eHow to Read the Chart\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eThe \u003cb\u003ehorizontal axis\u003c\/b\u003e is the \u003cb\u003eWavelength in Nanometers\u003c\/b\u003e (nm). 400nm is deep blue, at 520nm the human eye senses green and at 600nm red. At 656nm is the famous “H-Alpha” emission line of hydrogen.\u003c\/li\u003e\n\u003cli\u003eThe \u003cb\u003etransmission in %\u003c\/b\u003e is plotted on the \u003cb\u003evertical axis\u003c\/b\u003e.\u003c\/li\u003e\n\u003cli\u003eThe red line shows the \u003cb\u003etransmission of the filter\u003c\/b\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eVisual filters\u003c\/b\u003e: The \u003cb\u003egrey\u003c\/b\u003e line in the background shows the relative sensitivity of the human eye at night. The maximum is at ~510nm and drops to longer and shorter wavelengths. You can easily see, that you can´t see anything of the H-alpha line at night (even if you can during daylight!) The sensitivity at 656nm is 0% at night!\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003ePhotographic filters\u003c\/b\u003e: The grey line in the background shows the sensitivity of a typical CCD sensor.\u003c\/li\u003e\n\u003cli\u003eThe most important \u003cb\u003eartifical emission\u003c\/b\u003e lines are shown in orange. The artifical light pollution is dominated by see mercury (Hg) and sodium (Na), which are used in nearly all streetlights.\u003c\/li\u003e\n\u003cli\u003eThe most important \u003cb\u003eemission lines from nebulas\u003c\/b\u003e are shown in green. The most important lines are from ionized Hydrogen (H-alpha and H-beta) and double ionized oxygen (OIII).\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eTechnical Data\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003etyp. 95% transmission at 496nm (OIII)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003etyp. 95% transmission at 501nm (OIII)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003eComplete blocking of all disturbing wavelength coverages\u003c\/li\u003e\n\u003cli\u003eThe ideal filter for telescopes 10 \" (25cm) and larger\u003c\/li\u003e\n\u003cli\u003eMain operational use: Planetary nebulas \u0026amp; super nova remnants\u003c\/li\u003e\n\u003cli\u003eNo moisture-sensitivity, no aging, and totally scratch-proof\u003c\/li\u003e\n\u003cli\u003eExcellent carrier material - substrate is optically polished. The optical performance (resolution \u0026amp; contrast) of your telescope is not reduced in any way by the filter.\u003c\/li\u003e\n\u003cli\u003eParfocal with other Astronomik filters\u003c\/li\u003e\n\u003cli\u003eGlass thickness: 1mm\u003c\/li\u003e\n\u003cli\u003eCompletely resistant against high humidity, scratches and aging effects\u003c\/li\u003e\n\u003cli\u003eDiffraction limited, the filter will not reduce the optical performance of your telescope!\u003c\/li\u003e\n\u003cli\u003eAstronomik filters are delivered in a high-quality, long lasting, filter box\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eIn the box\u003c\/h3\u003e\n\u003cp\u003eFilter and filter case\u003c\/p\u003e\n\u003ch3\u003eManual \u0026amp; Warranty\u003c\/h3\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/istronomyplus.com\/pages\/astronomik-warranty\" target=\"_blank\"\u003eAstronomik 10-Year Warranty\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Astronomik","offers":[{"title":"1.25\" (M28.5)","offer_id":44116153204965,"sku":"AK-8h0006","price":135.0,"currency_code":"CAD","in_stock":true},{"title":"2\" (M48)","offer_id":44116153237733,"sku":"AK-8h0045","price":271.0,"currency_code":"CAD","in_stock":true},{"title":"SC Rear Cell (2'' \/ 24TPI)","offer_id":44116153270501,"sku":"AK-8h00bk","price":312.0,"currency_code":"CAD","in_stock":true},{"title":"T-Mount (M42 x 0.75)","offer_id":44127359631589,"sku":"AK-8h00bj","price":271.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/astronomik-oiii-visual-filter-astronomy-plus-1.jpg?v=1690483935"},{"product_id":"tele-vue-bandmate-nebustar-type-ii-filter","title":"Tele Vue Bandmate Nebustar Type II Filter","description":"\u003ch2\u003eTele Vue Bandmate Nebustar Type II Filter\u003c\/h2\u003e\n\u003cp\u003eThe Tele Vue Bandmate Nebustar Type II Filter is a unique narrowband design specifically for Tele Vue. It’s available in 1.25″ or 2″ mounted format. Unlike other UHC designs, Nebustar blocks red wavelengths normally passed by typical UHC filters. The design eliminates star bloat to produce sharper, more natural looking stars along with enhanced nebulosity. This is a great general-purpose nebula filter for scopes of any size. Astronomik is proud to deliver this exclusive filter through Tele Vue and wishes that customers “enjoy magnificent observing sessions with our most recent development for visual observers: The TeleVue Type 2 Nebustar.”\u003c\/p\u003e\n\u003ch4\u003eBackground\u003c\/h4\u003e\n\u003cp\u003eThe first thing you’ll notice is that these filters are produced for us in Germany by Astronomik. Tele Vue and Astronomik are two relatively small companies that adhere to the same philosophy. Do it better, or don’t do it at all; the products, customer, and night sky deserve it.\u003c\/p\u003e\n\u003cp\u003eDavid Nagler and Gerd Neumann had crossed paths at astronomy shows for years. Both have had their frustrations with the filter business. From passband to thread tolerances, the filter industry seems like the “wild west” of astronomical products. We had been looking to develop a long-term supplier of state-of-the-art, custom filters and approached Astronomik with the idea of reintroducing Tele Vue’s line of premium quality Bandmate filters; guaranteed to perform and fit, with uniformity beyond any competitive brand. Gerd and Eric of Astronomik were excited with the idea of a partnership with Tele Vue. “When we started into Amateur-Astronomy, Tele Vue already was a legendary brand known for its outstanding quality of their telescopes and eyepieces. Today we are proud to team up with them to share our knowledge and experience in filter design and production and bring the best filters possible to all astronomers worldwide.”\u003c\/p\u003e\n\u003cp\u003eThe distinction you’ll find with Bandmate filters is their consistency, achieved by keeping control of the manufacturing and quality control processes each company does so well. All the materials are sourced in Germany. Each filter is: optically tested by Tele Vue in high power-space to ensure no image degradation, tested by Astronomik on a spectrograph to ensure the coating meets design specifications, mechanically tested for fit, cosmetically inspected for pinholes, digs, and sleeks and serialized, all to insure customer satisfaction. All filters are backed with a 10-year warranty against manufacturing defects.\u003c\/p\u003e\n\u003cdiv style=\"text-align: left;\"\u003e\n\u003cdiv class=\"woocommerce-Tabs-panel woocommerce-Tabs-panel--local_1 panel entry-content\" id=\"tab-local_1\" role=\"tabpanel\" aria-labelledby=\"tab-title-local_1\"\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eSize: 1.25″ mounted or 2″ mounted\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eIn the Box\u003c\/span\u003e\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"woocommerce-Tabs-panel woocommerce-Tabs-panel--local_2 panel entry-content\" id=\"tab-local_2\" role=\"tabpanel\" aria-labelledby=\"tab-title-local_2\"\u003e\n\u003cp\u003e\u003cspan\u003eBandmate Nebustar Type II Filter\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eFilter Case\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003eManuals \u0026amp; Warranty \u003c\/h3\u003e\n\u003cp\u003eTele Vue 10-Years Warranty\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/Tele-Vue-Bandmate-Filters-Transmission-Graph.pdf?v=1669922695\" target=\"_blank\"\u003eTele Vue Bandmate Filters Transmission Graph\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Tele Vue","offers":[{"title":"1.25\" mounted","offer_id":43732862468325,"sku":"TV-B2N-0125","price":204.0,"currency_code":"CAD","in_stock":true},{"title":"2\" mounted","offer_id":43732862501093,"sku":"TV-B2N-0200","price":450.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/tele-vue-bandmate-nebustar-type-ii-filter-astronomy-plus-1_eec400cf-7905-402d-ab9d-24d2759a3292.png?v=1690484202"},{"product_id":"baader-uhc-s-l-booster-filter","title":"Baader UHC-L \/ Ultra-L-Booster Filter (CMOS-optimized)","description":"\u003ch1 class=\"product-title\"\u003eBaader UHC-L \/ Ultra-L-Booster Filter (CMOS-optimized)\u003c\/h1\u003e\n\u003cp\u003eNew CMOS-optimized Baader UHC-L DeepSky Filter from Baader Planetarium with Reflex-Blocker™and Life-Coat™.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eVisual and photographic 1¼\" UHC-L Nebula filter with highest transmission\u003c\/li\u003e\n\u003cli\u003eUltra High Contrast L Filter blocks city lights and increases contrast of nebula and comets (C2 lines)\u003c\/li\u003e\n\u003cli\u003eCan be used as LED-opimized Luminance filter for RGB-Imaging wtih skyglow suppression\u003c\/li\u003e\n\u003cli\u003eBlue transmission optimized to block blueish skyglow caused by LED car- and streetlights.\u003c\/li\u003e\n\u003cli\u003eCreates a much brighter image than a conventional Nebula filter\u003c\/li\u003e\n\u003cli\u003eIdeal for deep-sky observers. This UHC-L filter is the perfect visual complement to narrowband OIII filters.\u003c\/li\u003e\n\u003cli\u003eReflex-Blocker™ hard coated and planeoptically polished – with sealed coating edges (Life-Coat™)\u003c\/li\u003e\n\u003cli\u003eBlackened edges all around, with filter-lead-side-indicator in the form of a telescope-sided black outer rim\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eBaader UHC-L Nebula filter with highest transmission, realistic star colors, also usable as highly effective LED-optimized luminance filter for LRGB imaging.\u003c\/h4\u003e\n\u003cp\u003eThe Baader UHC-L filter is the classic allround \"light pollution rejection filter\", but now also blocked against the main LED emissions in the blue part of the spectrum. The passband curve corresponds to a wide dual-band filter without distorting star colors. The two passbands transmitt all light emitted by the known gas nebulae (the H-alpha and H-beta lines of fluorescent hydrogen as well as the OIII line of oxygen), while both the atmospheric most disturbing stray light from LED lamps and intense bluish car headlights as well as further stray light from classical street lamps and the natural night sky glow (airglow\/skyglow) of the atmosphere are blocked to a large extent. At the same time, the UHC-L filter is coated with latest technology (CMOS-optimized) and therefore blocks false light much more effective than all previous UHC filters.\u003c\/p\u003e\n\u003ch2\u003eUse of the UHC-L filter\u003c\/h2\u003e\n\u003cp\u003eThe application of the UHC-L happens mainly in visual and photographic observation of emission nebulae (star forming regions, planetary nebulae, supernova remnants) under medium to highly polluted skies. Its use is also interesting for comet observation: It passes the OIII line at 501nm as well as the two C2 lines at 511nm and 514nm which are characteristic for the gas tail of many comets.\u003c\/p\u003e\n\u003cp\u003eThis UHC-L filter is the successor of the well-proven plane-optical polished Baader UHC-S filter. It consequently complements it with the advantages of CMOS optimization (no disturbing halos, blackened filter edges, Life-Coat™-coating) while providing an improved transmission spectrum adapted to also cover modern LED light pollution. It provides a brighter image than many classic LPR (Light Pollution Rejection) filters and is therefore not only suitable for large, fast instruments, but also for smaller telescopes collecting less light, where a large exit pupil cannot be achieved. This applies for long-focal length telescopes as well as for small aperture telescopes that only have an eyepiece socket for 1.25\" eyepieces. Unlike the single line or dual line narrowband filters, the image is also bright enough for high magnification, while not diminishing the number of stars.\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eFor deep-sky observers, therefore, this UHC-L filter is the perfect visual complement to narrowband OIII filters.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe UHC-L filter is also\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eexcellent for photographic use\u003c\/strong\u003e. It does not just block polluting terrestrial light sources, but at the same time it serves as a luminance filter (L-filter), since it blocks all UV and IR transmission like a UV\/IR cut filter. An additional UV\/IR-cut filter is therefore not necessary: Cameras without a built-in UV\/IR-cut filter thus deliver significantly sharper images on refracting telescopes. Both classical photographers and users of EAA\/LiveStacking do benefit from the increased sharpness of stars and better contrast of nebulae, as well as the improved transmittance in H-alpha.\u003c\/p\u003e\n\u003cp\u003eLike all Baader CMOS-optimized filters, Baader UHC-L filters likewise are plano-optically polished, with ultra-hard, sputtered dielectric coatings. Even a one-hour bath in boiling water cannot harm these filters! They are scratch-resistant and can be cleaned as often as desired.\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003eThe Baader UHC-L \/ Ultra-L-Booster Filter offers all the advantages of the CMOS-opitmized Baader filters:\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eIncreased contrast, matched for typical CMOS quantum efficiency and s\/n ratio\u003c\/li\u003e\n\u003cli\u003eReflex-Blocker™ coatings, for largest ever freedom from halos, even under most adverse conditions concerning aux-optics\u003c\/li\u003e\n\u003cli\u003eIdentical filter thickness to existing standards, with utmost care for parfocality\u003c\/li\u003e\n\u003cli\u003eBlackened edges all around, with filter-lead-side-indicator in the form of a black frontside outer rim, to additionally eliminate any reflection due to light falling onto the edge of a filter\u003c\/li\u003e\n\u003cli\u003eEach filter coated individually, with sealed coating edge (NOT cut out of a larger plate with coatings left exposed)\u003c\/li\u003e\n\u003cli\u003eLife-Coat™: evermore hard coatings to enable a non-aging coating for life – even in a most adverse environment\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/uhc-l-ultra-l-booster-filter-31mm-0a1_928x576_07cdff75-c6ba-463b-a37c-91c94f3c7a59_480x480.webp?v=1701965652\" width=\"551\" height=\"335\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable id=\"product-attribute-specs-table\" class=\"data-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003e\u003cspan\u003eMANUFACTURER\u003c\/span\u003e\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eBaader Planetarium\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003e\u003cspan\u003eSize\u003cbr\u003e\u003c\/span\u003e\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e\n\u003cp\u003e1.25\"\u003cbr\u003e2\"\u003cbr\u003e31 mm\u003cbr\u003e36 mm\u003cbr\u003e50.4 mm\u003cbr\u003e50 x 50 mm\u003cbr\u003e65 x 65 mm\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003e\u003cspan\u003eNET WEIGHT (KG)\u003c\/span\u003e\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e0.006 - 0.032\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003e\u003cspan\u003eCOLOUR\u003c\/span\u003e\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eBlack\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003e\u003cspan\u003eTRANSMISSION RANGE\u003c\/span\u003e\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e\u003cspan\u003emultiple bands (see spectral image)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003e\u003cspan\u003eFILTER THICKNESS (WITHOUT CELL)\u003c\/span\u003e\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2 mm - 3mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003e\u003cspan\u003eAR-COATING\u003c\/span\u003e\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eReflex-Blocker™ hard coated, planeoptically polished\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003e\u003cspan\u003eSPECIAL FEATURES\u003c\/span\u003e\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eCMOS-optimized with\u003cspan\u003e \u003c\/span\u003eLife-Coat™\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003e\u003cspan\u003eFILTER USAGE\u003c\/span\u003e\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e\u003cspan\u003eContrast Enhancement, Light Pollution Reduction, Luminance\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003e\u003cspan\u003eFILTER MOUNTED\u003c\/span\u003e\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e1.25\" \u0026amp; 2\" Mounted (LPFC 6mm) \/ rest unmounted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003e\u003cspan\u003eTYPE OF FILTER\u003c\/span\u003e\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eBandpass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ctable class=\"data-table\" id=\"product-attribute-specs-table\" style=\"box-sizing: inherit; -webkit-font-smoothing: antialiased; text-size-adjust: none; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); border: 1px solid rgba(128, 128, 128, 0.16); box-shadow: rgba(128, 128, 128, 0.11) 0px 1px 4px; display: block; border-collapse: collapse; max-width: 100%; height: auto; overflow: auto; white-space: normal; background-color: #ffffff; width: 1499.53px; text-align: left; table-layout: fixed; color: #4c5154; font-family: 'Libre Franklin', sans-serif; font-size: 15px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;\"\u003e\n\u003ctbody style=\"box-sizing: inherit; -webkit-font-smoothing: antialiased; text-size-adjust: none; -webkit-tap-highlight-color: rgba(0, 0, 0, 0);\"\u003e\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003e\u003cbr\u003e\u003c\/h3\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eIn the Box\u003c\/h3\u003e\n\u003cdiv style=\"box-sizing: inherit; -webkit-font-smoothing: antialiased; text-size-adjust: none; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: #4c5154; font-family: 'Libre Franklin', sans-serif; font-size: 15px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; text-align: left;\" data-mce-fragment=\"1\" data-mce-style=\"box-sizing: inherit; -webkit-font-smoothing: antialiased; text-size-adjust: none; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: #4c5154; font-family: 'Libre Franklin', sans-serif; font-size: 15px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; text-align: left;\"\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003eBaader UHC-L \/ L-Booster Filter\u003cbr data-mce-fragment=\"1\"\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"centerImage\" data-mce-fragment=\"1\"\u003e\n\u003cdiv class=\"pdp-content-description rte active\" data-pdp-tab-content=\"description\" data-mce-fragment=\"1\"\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\u003c\/ul\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\u003c\/ul\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eWarranty \u0026amp; Manuals\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003e2-Year Warranty\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Baader Planetarium","offers":[{"title":"1.25\"","offer_id":43571900416229,"sku":"BAA-FUHCL-1 (Baader #2961560)","price":143.0,"currency_code":"CAD","in_stock":true},{"title":"2\"","offer_id":43571900448997,"sku":"BAA-FUHCL-2 (Baader #2961563)","price":247.0,"currency_code":"CAD","in_stock":true},{"title":"31mm","offer_id":44461029097701,"sku":"FUHCL-RD31 (Baader #2961561)","price":166.0,"currency_code":"CAD","in_stock":true},{"title":"36mm","offer_id":43571900481765,"sku":"BAA-FUHCL-RD36 (Baader #2961562)","price":201.0,"currency_code":"CAD","in_stock":true},{"title":"50.4mm","offer_id":43571900514533,"sku":"BAA-FUHCL-RD50 (Baader #2961564)","price":255.0,"currency_code":"CAD","in_stock":true},{"title":"50 x 50mm","offer_id":43571900547301,"sku":"BAA-FUHCL-SQ50 (Baader #2961565)","price":401.0,"currency_code":"CAD","in_stock":true},{"title":"65 x 65mm","offer_id":44461121339621,"sku":"BAA-FUHCL-SQ65 (Baader #2961566)","price":561.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/uhc-l-ultra-l-booster-filter-e7d_704x704_df8eb581-f466-40c1-9d37-ae645365fe9d.webp?v=1777045449"},{"product_id":"idas-nb1-nebula-booster-filter-h-alpha-h-beta-oiii","title":"IDAS NB1 Nebula Booster Filter H-alpha, H-beta \u0026 OIII","description":"\u003ch2\u003eIDAS NB1 Nebula Booster Filter H-alpha, H-beta \u0026amp; OIII\u003c\/h2\u003e\nThe IDAS NB1 Nebula Booster Filter is a triple line-pass filter (H-alpha, H-beta \u0026amp; OIII) which can be used with one-shot color (OSC) cameras such as DSLR's or astronomical OSC cameras. Passing the red Hα+NII and the green-blue Hβ+OIII lines, the NB1 filter enhances the contrast of emission line nebulae without the time-consuming use of single-band filters. IDAS NB Filters are designed to enhance the contrast of emission nebula, yet accommodate the filter spectral shift*when used with modern fast optical systems. All interference filters are subject to a bandpass spectral shift which depends on the angle of incidence of the incoming light. IDAS NB filters are designed to accommodate the spectral shift of modern fast optical systems. When placed in front of an optical system, the spectral shift is determined by the focal length of the optics and the size of the imaging sensor. For an APS-C sensor, up to a 50mm focal length can be accommodated. For a full-frame sized sensor, up to an 80mm focal length can be used. For filters placed between the optical system and imaging sensor, the situation is more complex. IDAS NB filters are designed with modern fast optics in mind and can accommodate an angle of incidence of up to 14°.\n\u003ch4\u003e\u003c\/h4\u003e\n\u003ch4\u003eFeatures\u003cbr\u003e\n\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eIdeal flat-top and moderate bandpass\u003c\/li\u003e\n\u003cli\u003eExcellent in-band transmission\u003c\/li\u003e\n\u003cli\u003eExtremely steep bandpass edges minimize internal reflections\u003c\/li\u003e\n\u003cli\u003eNear IR (NIR) is blocked up to 1100nm\u003c\/li\u003e\n\u003cli\u003eAvailable in 52mm and 48mm sizes\u003c\/li\u003e\n\u003cli\u003e2.5mm thickness (parfocal with other IDAS LPS filters)\u003c\/li\u003e\n\u003cli\u003eIDAS-proprietary IGAD\/MBT\/UFPquality\u003c\/li\u003e\n\u003cli\u003eMade in Japan\u003c\/li\u003e\n\u003c\/ul\u003e\nMore on other members of the NB filter family...\n\u003ctable cellspacing=\"0\" cellpadding=\"0\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd valign=\"middle\"\u003e\u003c\/td\u003e\n\u003ctd valign=\"middle\"\u003eEmission Lines\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd valign=\"middle\"\u003eNB1\u003c\/td\u003e\n\u003ctd valign=\"middle\"\u003eTriple - Hβ+OIII, Hα\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd valign=\"middle\"\u003eNB2\u003c\/td\u003e\n\u003ctd valign=\"middle\"\u003eDual - OIII, Hα\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd valign=\"middle\"\u003eNB3\u003c\/td\u003e\n\u003ctd valign=\"middle\"\u003eDual - OIII, SII\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003e\u003c\/h3\u003e\n\u003ch4\u003eIDAS Filter Technology\u003c\/h4\u003e\nA chain is only as good as its weakest link. This applies as well to an optical system such as a telescope\/filter\/imager system. With this in mind, IDAS filters are manufactured using unique technologies that result in quality that meets or exceeds that of the rest of your optical imaging system:\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eIGAD (Ion-Gun Assist Deposition)\u003c\/b\u003e This coating technology was originally developed for the optical communications field where long-term stability (\u0026gt;25 years) over harsh field conditions is required.IDAS is the first manufacturer to apply this technology to astronomical filters. This results in superior filters with robust coatings and long-term spectral stability even under temperature and humidity extremes. This stability is especially important for bandpass curves with steep slopes such as H-alpha, LPS filters, and other narrow bandpass filters. IGAD filters virtually eliminate bandpass shifts from the +\/-3 or 4nm typical of standard coating filters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eMBT (Multi Band-pass Technology)\u003c\/b\u003e This is technology originally developed for biomedical microscopes, but improved by IDAS by combining it the IGAD hard-coating technology described above. The excellent filter responses possible with this technology allows IDAS to create very complicated filters for astronomical use such as the unique LPS filter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eUFP (Ultra Fine Polish) Finishing\u003c\/b\u003e IDAS filters are polished twice as long as is typical for optical glass. In combination with the use of high-quality substrate glass, no scratches, bubbles, or other defects are visible even under microscopic inspection.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cbr\u003e\n\u003ch3\u003eIn the Box\u003cbr\u003e\n\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eNB1 Filter\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003eManual \u0026amp; Warranty\u003c\/h3\u003e\n\u003cp\u003eIDAS 3-Year Warranty\u003c\/p\u003e","brand":"IDAS","offers":[{"title":"48mm mounted (2mm thickness)","offer_id":45659500839141,"sku":"IDA-NB1-48ST2","price":245.0,"currency_code":"CAD","in_stock":true},{"title":"ZWO Cameras","offer_id":43673497665765,"sku":"IDA-NB1-ZF","price":245.0,"currency_code":"CAD","in_stock":true},{"title":"DS for use with IDAS AD42-DSS","offer_id":47818781491429,"sku":"IDA-NB1-DS","price":297.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/products\/IDAS-NB1-Nebula-Booster-Filter-1.webp?v=1668192318"},{"product_id":"astronomik-cls-filter","title":"Astronomik CLS Filter","description":"\u003ch2\u003eAstronomik CLS Filter\u003c\/h2\u003e\n\u003cp\u003eThe Astronomik CLS Filter is a budget filter for visual observation, Black \u0026amp; White photography and CCD photographs of nebulae, galaxies and star clusters with astronomical instruments of any size. The Astronomik CLS Filter blocks the light of the spectral lines of mercury and sodium-vapor lamps and lets the largest part of the visible light and H-alpha emissions pass. All the important emission lines, as well as the spectral region that the very well dark adapted eye can see, can pass through the filter.\u003c\/p\u003e\n\u003ch3\u003eMain use\u003c\/h3\u003e\n\u003cp\u003eThe filters are optimized for use with aperture ratios from 1:3 to 1:15. Transmission losses and chromatic distortions, which are problems with other filters, only appear with Astronomik filters when extremely bright aperture ratios of 1:2 and more are used. The CLS filter is suitable for use with telescopes of all aperture sizes.\u003c\/p\u003e\n\u003ch3\u003eSuitability\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eVisual observation (dark skies): Good, to reduce light pollution by mercury-vapour lamps (streetlight)\u003c\/li\u003e\n\u003cli\u003eVisual observation (urban skies): Good, an UHC-E or UHC filter is more suitable\u003c\/li\u003e\n\u003cli\u003eFilm photography: Very good, colour balance is near perfect\u003c\/li\u003e\n\u003cli\u003eCCD photography: Good, when used with an additional IR-block-filter\u003c\/li\u003e\n\u003cli\u003eDSLR photography (original): Good, colour balance shifted but contrast enhanced\u003c\/li\u003e\n\u003cli\u003eDSLR photography (astro modified): Very good, colour balance is near perfect\u003c\/li\u003e\n\u003cli\u003eDSLR photography (MC modified): Good, when used with an additional IR-block-filter\u003c\/li\u003e\n\u003cli\u003eWebcam \/ Video (Planets): Unsuitable\u003c\/li\u003e\n\u003cli\u003eWebcam \/ Video (Deep Sky): Very good, if light pollution is a big problem\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe table gives you a short Overview about the suitability of our filters for various applications: \u003cstrong\u003eLegend\u003c\/strong\u003e ++ The filter is excellent for this application, the dramatic better image! + The filter is good for this application, the much better image! o The filter is suitable for this application, the slightly better image! - The filter is usable for this application. -- The filter is not suitable for this application. \u003c\/p\u003e\n\u003cdiv class=\"basic ui-accordion selected\" id=\"list1b\"\u003e\n\u003ch3\u003eHow to Read the Chart\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eThe \u003cb\u003ehorizontal axis\u003c\/b\u003e is the \u003cb\u003eWavelength in Nanometers\u003c\/b\u003e (nm). 400nm is deep blue, at 520nm the human eye senses green and at 600nm red. At 656nm is the famous \"H-Alpha\" emission line of hydrogen.\u003c\/li\u003e\n\u003cli\u003eThe \u003cb\u003etransmission in %\u003c\/b\u003e is plotted on the \u003cb\u003evertical axis\u003c\/b\u003e.\u003c\/li\u003e\n\u003cli\u003eThe \u003cspan style=\"color: red;\"\u003ered\u003c\/span\u003e line shows the \u003cb\u003etransmission of the filter\u003c\/b\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eVisual filters\u003c\/b\u003e: The \u003cb\u003egrey\u003c\/b\u003e line in the background shows the relative sensitivity of the human eye at night. The maximum is at ~510nm and drops to longer and shorter wavelengths. You can easily see, that you can´t see anything of the H-alpha line at night (even if you can during daylight!) The sensitivity at 656nm is 0% at night!\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003ePhotographic filters\u003c\/b\u003e: The grey line in the background shows the sensitivity of a typical CCD sensor.\u003c\/li\u003e\n\u003cli\u003eThe most important \u003cb\u003eartifical emission\u003c\/b\u003e lines are shown in \u003cspan style=\"color: orange;\"\u003eorange\u003c\/span\u003e. The artifical light pollution is dominated by see mercury (Hg) and sodium (Na), which are used in nearly all streetlights.\u003c\/li\u003e\n\u003cli\u003eThe most important \u003cb\u003eemission lines from nebulas\u003c\/b\u003e are shown in \u003cspan style=\"color: green;\"\u003egreen\u003c\/span\u003e. The most important lines are from ionized Hydrogen (H-alpha and H-beta) and double ionized oyxgen (OIII).\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cspan style=\"color: orange;\"\u003eThe major emission lines of artifical light pollution: | Hg 435,8nm | Hg 546,1nm | Hg 577,0nm | Hg 578,1nm | | Na 589,0nm | Na 589,6nm | Na 615,4nm | Na 616,1nm | \u003c\/span\u003e \u003cspan style=\"color: green;\"\u003eThe major emission lines of nebulas: H-β 486,1nm | OIII 495,9nm | OIII 500,7nm | H-α 656,3nm\u003c\/span\u003e\n\u003c\/div\u003e\n\u003ch3\u003eQuality Characteristics of Astronomik Filters\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSuperior Substrate: \u003c\/strong\u003eAstronomik filters consist of a precision polished substrate on which the actual filter, in the form of very thin (dichroic) interference layers, is applied. Because of these high quality measures Astronomik filters will in no way reduce the performance of your optical system. And contrary to common experience with other manufacturers´ filters, with Astronomik filters stars remain fine needle points of light!\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoating: \u003c\/strong\u003eAstronomik filters consist of up to 130 layers deposited on top of the completely transparent carrier glass. These layers work as the actual filter and as an antireflective coating.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurability: \u003c\/strong\u003eAstronomik filters are completely scratch resistant, and not sensitive to moisture, dew, or high humidity. With others’ filters, after a few years, you start to notice their filter is no longer up to its full capability. Not so with Astronomik filters which maintain their ‘brand new’ transmission specifications year after year. \u003cstrong\u003eAnd, because of Astronomik’s extraordinarily resistant coating technology, our filters come with a 10year warranty.\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eAstronomik filters are highquality accessories for visual observing which will significantly expand your observing opportunities. After many years of use your Astronomik filters will be an accessory which will be ready to give you the same joy you experienced many years earlier when they were new. Now that’s an investment worth making!\u003c\/p\u003e\n\u003ch4\u003eCompatible Canon EOS R APS-C cameras\u003c\/h4\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left;\"\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth style=\"text-align: center;\"\u003e\u003cstrong\u003eCompatibility\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left;\"\u003eCanon EOS R7\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\"\u003e\u003cimg src=\"https:\/\/www.astronomik.com\/media\/c5\/79\/36\/1775813946\/Haken.svg?ts=1775813946\" style=\"width: 23px; height: 18px;\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left;\"\u003eCanon EOS R10\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\"\u003e\u003cimg src=\"https:\/\/www.astronomik.com\/media\/c5\/79\/36\/1775813946\/Haken.svg?ts=1775813946\" style=\"width: 23px; height: 18px;\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left;\"\u003eCanon EOS R50\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\"\u003e\u003cimg src=\"https:\/\/www.astronomik.com\/media\/c5\/79\/36\/1775813946\/Haken.svg?ts=1775813946\" style=\"width: 23px; height: 18px;\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left;\"\u003eCanon EOS R50 V\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\"\u003e\u003cimg src=\"https:\/\/www.astronomik.com\/media\/c5\/79\/36\/1775813946\/Haken.svg?ts=1775813946\" style=\"width: 23px; height: 18px;\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left;\"\u003eCanon EOS R100\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\"\u003e\u003cimg src=\"https:\/\/www.astronomik.com\/media\/c5\/79\/36\/1775813946\/Haken.svg?ts=1775813946\" style=\"width: 23px; height: 18px;\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch4\u003eNon-compatible Canon lenses\u003c\/h4\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left;\"\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth style=\"text-align: center;\"\u003e\u003cstrong\u003eCompatibility\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left;\"\u003eCanon RF 14mm f\/1.4 L VCM\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\"\u003e\u003cimg src=\"https:\/\/www.astronomik.com\/media\/9e\/75\/05\/1775813946\/Kreuz.svg?ts=1775813946\" style=\"width: 18px; height: 18px;\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left;\"\u003eCanon RF 28mm F2.8 STM\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\"\u003e\u003cimg src=\"https:\/\/www.astronomik.com\/media\/9e\/75\/05\/1775813946\/Kreuz.svg?ts=1775813946\" style=\"width: 18px; height: 18px;\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left;\"\u003eCanon RF 35mm F1.8 IS Macro STM\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\"\u003e\u003cimg src=\"https:\/\/www.astronomik.com\/media\/9e\/75\/05\/1775813946\/Kreuz.svg?ts=1775813946\" style=\"width: 18px; height: 18px;\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left;\"\u003eCanon RF 85mm F1.2L USM\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\"\u003e\u003cimg src=\"https:\/\/www.astronomik.com\/media\/9e\/75\/05\/1775813946\/Kreuz.svg?ts=1775813946\" style=\"width: 18px; height: 18px;\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left;\"\u003eCanon Extender RF 2x\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\"\u003e\u003cimg src=\"https:\/\/www.astronomik.com\/media\/9e\/75\/05\/1775813946\/Kreuz.svg?ts=1775813946\" style=\"width: 18px; height: 18px;\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left;\"\u003eCanon Extender RF 1.4x\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\"\u003e\u003cimg src=\"https:\/\/www.astronomik.com\/media\/9e\/75\/05\/1775813946\/Kreuz.svg?ts=1775813946\" style=\"width: 18px; height: 18px;\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eAstronomik filters are diffraction-limited, ensuring that the optical performance (resolution and contrast) of your telescope is not compromised. Thanks to the high-precision machining of the glas substrate, all Astronomik filters are parfocal. The wedge errors are far below all common tolerances. Therefore, all issues concerning focal distances and the exact alignment of images from each color channel are effectively eliminated.\u003c\/p\u003e\n\u003cp\u003eAll Astronomik filters are ideal for modern cameras, including both CMOS- and CCD-based models, ensuring you capture the best possible images with your equipment. Sharpness, contrast, and the absence of any reflections and halos are guaranteed. Even with bright stars in the field of view, nebulae and galaxies will be captured with the finest structures. The Astronomik MFR and MaxFR coatings are designed for optimal performance across a wide range of focal ratios of the optics used.\u003c\/p\u003e\n\u003cp\u003eEvery Astronomik filter undergoes a rigorous quality control process before delivery.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e92% transmission at 486nm (H-beta)\u003c\/li\u003e\n\u003cli\u003e92% transmission at 496nm (OIII)\u003c\/li\u003e\n\u003cli\u003e92% transmission at 501nm (OIII)\u003c\/li\u003e\n\u003cli\u003e97% transmission at 656nm (H-alpha)\u003c\/li\u003e\n\u003cli\u003eTransmission range: 450 to 540nm and above 650nm\u003c\/li\u003e\n\u003cli\u003eGlass thickness: 1mm (except Astronomik OWB Type 3 and XT filters)\u003c\/li\u003e\n\u003cli\u003eFinely polished optical glass, free of any striae, residual stresses, and bubbles\u003c\/li\u003e\n\u003cli\u003eExtremely scratch-resistant and durable coating\u003c\/li\u003e\n\u003cli\u003eCompletely resistant against high humidity and aging effects\u003c\/li\u003e\n\u003cli\u003eParfocal with other Astronomik filters\u003c\/li\u003e\n\u003cli\u003eDiffraction-limited\u003c\/li\u003e\n\u003cli\u003eOptimized spectral windows\u003c\/li\u003e\n\u003cli\u003eDelivered in a high-quality, long-lasting filter box\u003c\/li\u003e\n\u003cli\u003eMade in Germany\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cp\u003eCLS filter, at selected size. \u003c\/p\u003e\n\u003ch3 class=\"tab__content tab.box tab__content--active\" data-content=\"tab-3\" aria-labelledby=\"tab-title-3\" aria-hidden=\"false\" role=\"tabpanel\"\u003e\n\u003cspan\u003eManual \u0026amp; Warranty\u003c\/span\u003e\u003cbr\u003e\n\u003c\/h3\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.astronomik.com\/en\/warranty-garantie.html\"\u003eAstronomik\u003cspan\u003e \u003c\/span\u003e\u003c\/a\u003e10 year warranty\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Astronomik","offers":[{"title":"1.25\"\/M28.5","offer_id":43445845393637,"sku":"AK-8H0053","price":108.0,"currency_code":"CAD","in_stock":true},{"title":"2\"\/M48","offer_id":43445845426405,"sku":"AK-8H0054","price":230.0,"currency_code":"CAD","in_stock":true},{"title":"31mm Round","offer_id":43445845459173,"sku":"AK-8H00FI","price":135.0,"currency_code":"CAD","in_stock":true},{"title":"36mm Round","offer_id":43445845491941,"sku":"AK-8H00FJ","price":162.0,"currency_code":"CAD","in_stock":true},{"title":"50mm Round","offer_id":43445845524709,"sku":"AK-8H00A3","price":230.0,"currency_code":"CAD","in_stock":true},{"title":"50 mm Square","offer_id":43445845557477,"sku":"AK-8H00AD","price":257.0,"currency_code":"CAD","in_stock":true},{"title":"Clip-Filter EOS APS-C","offer_id":43445845590245,"sku":"AK-8H00IC","price":176.0,"currency_code":"CAD","in_stock":true},{"title":"Clip-Filter EOS-R","offer_id":48895411519717,"sku":"AK-8h11uy","price":211.0,"currency_code":"CAD","in_stock":true},{"title":"Clip-Filter EOS M","offer_id":43445845623013,"sku":"AK-8H00R6","price":189.0,"currency_code":"CAD","in_stock":true},{"title":"Clip-Filter EOS XL","offer_id":43445845655781,"sku":"AK-8H00LC","price":244.0,"currency_code":"CAD","in_stock":true},{"title":"Clip-Filter EOS R XL","offer_id":44127368315109,"sku":"AK-8h11g9","price":271.0,"currency_code":"CAD","in_stock":true},{"title":"Clip-Filter Nikon XL","offer_id":43445845688549,"sku":"AK-8H11AS","price":271.0,"currency_code":"CAD","in_stock":true},{"title":"Clip-Filter Nikon Z XL","offer_id":44127378211045,"sku":"AK-8h11kx","price":271.0,"currency_code":"CAD","in_stock":true},{"title":"Clip-Filter Pentax K-1","offer_id":43445845721317,"sku":"AK-8H11EB","price":271.0,"currency_code":"CAD","in_stock":true},{"title":"Clip-Filter Sony alpha 7","offer_id":43445845754085,"sku":"AK-8H00XA","price":271.0,"currency_code":"CAD","in_stock":true},{"title":"M49","offer_id":44127383191781,"sku":"AK-8h00tl","price":244.0,"currency_code":"CAD","in_stock":true},{"title":"M52","offer_id":43445845786853,"sku":"AK-8H00TM","price":257.0,"currency_code":"CAD","in_stock":true},{"title":"M55","offer_id":44127389614309,"sku":"AK-8h00tn","price":489.0,"currency_code":"CAD","in_stock":true},{"title":"M58","offer_id":44127389647077,"sku":"AK-8h00to","price":502.0,"currency_code":"CAD","in_stock":true},{"title":"M62","offer_id":44127389679845,"sku":"AK-8h00tp","price":502.0,"currency_code":"CAD","in_stock":true},{"title":"M67","offer_id":44127389712613,"sku":"AK-8h00tq","price":530.0,"currency_code":"CAD","in_stock":true},{"title":"M72","offer_id":44127389745381,"sku":"AK-8h00h3","price":530.0,"currency_code":"CAD","in_stock":true},{"title":"M77","offer_id":44127389778149,"sku":"AK-8h00nz","price":530.0,"currency_code":"CAD","in_stock":true},{"title":"SC Rear Cell 2\"x24TPI","offer_id":43445845819621,"sku":"AK-8H00IA","price":257.0,"currency_code":"CAD","in_stock":true},{"title":"T-Mount\/M42x0.75","offer_id":43445845852389,"sku":"AK-8H00IU","price":203.0,"currency_code":"CAD","in_stock":true},{"title":"XT Clip-Filter EOS APS-C","offer_id":43445845885157,"sku":"AK-8H00KE","price":203.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/products\/Astronomik_CLS_T2-cell_4.jpg?v=1777042094"},{"product_id":"celestron-light-pollution-filter-rasa-11-93617","title":"Celestron Light Pollution Filter RASA 11\" (93617)","description":"\u003ch2 class=\"heading h2 pdp-product-title\"\u003eCelestron Light Pollution Filter RASA 11\"\u003c\/h2\u003e\n\u003cp\u003eGet the most out of your Celestron Rowe-Ackermann Schmidt Astrograph 11, even under light-polluted skies, with this Light Pollution Imaging Filter, custom-designed for the RASA. No matter which camera you use, this filter’s generous 68 mm clear aperture allows it to easily accommodate today’s largest sensors. Utilizing a machined aluminum housing and Schott B270 glass, the filter replaces the RASA’s clear optical window so the RASA’s optical performance is unaltered.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eRemove Light Pollution While Keeping Your Images Bright\u003c\/strong\u003e\u003cbr\u003eLight pollution limits how much of the night sky we can see and photograph. When imaging with a color camera in light polluted areas, skyglow degrades image quality. Light pollution filters help to selectively block light emitted from common streetlights and other ambient lighting. But most light pollution filters greatly compromise the total light throughput, causing dim images, and negatively impact the color balance, causing images to appear too green or blue.\u003cbr\u003e\u003cbr\u003eThe Light Pollution Imaging Filter for RASA “surgically” removes unwanted light pollution while preserving as much of the useful spectrum as possible. That means you’ll still retain over 90 percent of the light captured by your telescope at many wavelengths.\u003cbr\u003e\u003cbr\u003eUnlike other light pollution suppression filters, the Celestron LP Imaging Filter for RASA maintains a relatively neutral color balance so you can bring out subtle color in galaxies and other faint deep sky objects. Multiple layers of specially-formulated dielectric coatings provide the desired transmission, while anti-reflective coatings minimize star halos and internal reflections.\u003cbr\u003e\u003cbr\u003eAlso included is a clear plastic case to protect the filter when not in use\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eIndividually Tested for Quality\u003c\/strong\u003e\u003cbr\u003eEvery Celestron Light Pollution Imaging Filter is tested individually for light transmission. Inside the box, you’ll receive a graph detailing the actual transmission spectrum for your specific filter.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAdditional Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eTake beautiful images of deep-sky objects from light-polluted suburban locations with the Rowe-Ackermann Schmidt Astrograph 11 (RASA 11) using this light pollution suppression filter\u003cbr data-mce-fragment=\"1\"\u003e\n\u003c\/li\u003e\n\u003cli\u003eCustom designed to replace the RASA’s optical window, so you still get optimum optical performance even with the addition of the filter\u003cbr data-mce-fragment=\"1\"\u003e\n\u003c\/li\u003e\n\u003cli\u003eSelectively blocks unwanted light pollution while providing over 90% transmission at critical wavelengths\u003cbr data-mce-fragment=\"1\"\u003e\n\u003c\/li\u003e\n\u003cli\u003eMaintains a more neutral color balance than other light pollution imaging filters, perfect for imaging colorful nebulae and galaxies\u003cbr data-mce-fragment=\"1\"\u003e\n\u003c\/li\u003e\n\u003cli\u003eEvery filter is individually tested for light transmission. A graph of test results for your specific filter is included for your reference\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable class=\"table-open\" id=\"product-specs-list\" style=\"box-sizing: inherit; border-collapse: collapse; border-spacing: 0px; text-align: left; width: 1200px; color: #333e48; font-family: 'Open Sans', Arial, Helvetica, sans-serif; font-size: 14px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;\"\u003e\n\u003ctbody id=\"spec-block-1\" style=\"box-sizing: inherit;\"\u003e\n\u003ctr style=\"box-sizing: inherit; border-bottom: 1px solid #e4e8ea;\"\u003e\n\u003ctd style=\"box-sizing: inherit; padding: 13px; font-size: 14px; height: 43px; width: 300px; font-weight: bold;\"\u003eGlass thickness:\u003c\/td\u003e\n\u003ctd style=\"box-sizing: inherit; padding: 13px; font-size: 14px; height: 43px;\"\u003e2.1mm (0.08\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"box-sizing: inherit; border-bottom: 1px solid #e4e8ea;\"\u003e\n\u003ctd style=\"box-sizing: inherit; padding: 13px; font-size: 14px; height: 43px; width: 300px; font-weight: bold;\"\u003eFilter diameter:\u003c\/td\u003e\n\u003ctd style=\"box-sizing: inherit; padding: 13px; font-size: 14px; height: 43px;\"\u003e72mm (2.83\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"box-sizing: inherit; border-bottom: 1px solid #e4e8ea;\"\u003e\n\u003ctd style=\"box-sizing: inherit; padding: 13px; font-size: 14px; height: 43px; width: 300px; font-weight: bold;\"\u003eClear aperture:\u003c\/td\u003e\n\u003ctd style=\"box-sizing: inherit; padding: 13px; font-size: 14px; height: 43px;\"\u003e68mm (2.67\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"box-sizing: inherit; border-bottom: 1px solid #e4e8ea;\"\u003e\n\u003ctd style=\"box-sizing: inherit; padding: 13px; font-size: 14px; height: 43px; width: 300px; font-weight: bold;\"\u003eCoatings:\u003c\/td\u003e\n\u003ctd style=\"box-sizing: inherit; padding: 13px; font-size: 14px; height: 43px;\"\u003eHard Coated dielectric and multi-layer antireflection coatings\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"box-sizing: inherit; border-bottom: 1px solid #e4e8ea;\"\u003e\n\u003ctd style=\"box-sizing: inherit; padding: 13px; font-size: 14px; height: 43px; width: 300px; font-weight: bold;\"\u003eFilter glass:\u003c\/td\u003e\n\u003ctd style=\"box-sizing: inherit; padding: 13px; font-size: 14px; height: 43px;\"\u003eSchott B270\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"box-sizing: inherit; border-bottom: 0px;\"\u003e\n\u003ctd style=\"box-sizing: inherit; padding: 13px; font-size: 14px; height: 43px; width: 300px; font-weight: bold;\"\u003eHousing:\u003c\/td\u003e\n\u003ctd style=\"box-sizing: inherit; padding: 13px; font-size: 14px; height: 43px;\"\u003eAndodized aluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eIn the Box\u003c\/h3\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003eCelestron Light Pollution Filter RASA 11\"\u003cbr data-mce-fragment=\"1\"\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eWarranty \u0026amp; Manuals\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003e2-Year Warranty\u003c\/p\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":43125752725733,"sku":"CEL-93617","price":978.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/celestron-light-pollution-filter-rasa-11-93617-astronomy-plus-1.webp?v=1690484650"},{"product_id":"celestron-light-pollution-filter-rasa-8-93614","title":"Celestron Light Pollution Filter RASA 8\" (93614)","description":"\u003ch2 class=\"heading h2 pdp-product-title\"\u003eCelestron Light Pollution Filter RASA 8\"\u003c\/h2\u003e\n\u003cp\u003eLight pollution in the night sky can significantly degrade contrast in astronomical images. This is especially true when using very fast telescopes like the 8” RASA because the sky background saturates very quickly. The “noise” of the light pollution overwhelms the “signal” from the celestial object you are imaging, making it difficult to get the most detailed image. The Light Pollution Imaging Filter for the 8” RASA remedies this by blocking light pollution while transmitting light from deep-sky objects. The result is bright, detailed objects that pop off the black sky background with superior contrast.\u003cbr\u003e\u003cbr\u003eFortunately, many sources of light pollution have relatively discreet emission spectra; they emit primarily at specific wavelengths of light. By strategically blocking these wavelengths, the filter greatly reduces the effects of light pollution without degrading overall image quality.\u003cbr\u003e\u003cbr\u003eThe Light Pollution Imaging (LPI) Filter for the 8” RASA blocks light from some of the most common sources of light pollution between 400-700nm (i.e., the visible spectrum), including high- and low-pressure sodium-vapor streetlights, mercury-vapor streetlights, and natural airglow caused by oxygen in the atmosphere. Unlike some light pollution filters, the LPI filter blocks only specific areas of the spectrum instead of wide regions. This helps to maintain image brightness and color balance. In addition, specific wavelengths associated with emission nebulae, such as H-α(656nm), H-β (486nm), OIII (496nm and 501nm), and SII (672nm), are highly transmitted, ensuring minimal loss of image brightness for those objects.\u003cbr\u003e\u003cbr\u003eThe filter fits directly into the internal filter mount in the RASA 8’s front lens cell, where the optical window normally mounts. By removing the clear window and replacing it with the filter, optical performance for the entire system is maintained.\u003cbr\u003e\u003cbr\u003eEach filter comes with a plastic storage case to safely store the filter or the placeholder glass that came with your RASA when not in use. You will also receive a spectral transmission graph unique to your specific unit, verifying its performance.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAdditional Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eEnhance your 8” Rowe-Ackermann Schmidt Astrograph (RASA) by blocking light pollution, improving image contrast, and darkening the sky background.\u003cbr data-mce-fragment=\"1\"\u003e\n\u003c\/li\u003e\n\u003cli\u003eThis filter selectively blocks wavelengths of light from sources of light pollution, such as streetlights, not broad regions of the spectrum.\u003cbr data-mce-fragment=\"1\"\u003e\n\u003c\/li\u003e\n\u003cli\u003eDoes not block wavelengths associated with emission nebulae, keeping your nebula images bright and detailed.\u003cbr data-mce-fragment=\"1\"\u003e\n\u003c\/li\u003e\n\u003cli\u003eFits into the 8” RASA’s integrated filter mount, maintaining peak optical performance.\u003cbr data-mce-fragment=\"1\"\u003e\n\u003c\/li\u003e\n\u003cli\u003eOptically flat surfaces free of defects, constructed of Schott glass with anti-reflection coatings.\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable style=\"box-sizing: inherit; border-collapse: collapse; border-spacing: 0px; text-align: left; width: 1200px; color: #333e48; font-family: 'Open Sans', Arial, Helvetica, sans-serif; font-size: 14px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;\" id=\"product-specs-list\" class=\"table-open\"\u003e\n\u003ctbody style=\"box-sizing: inherit;\" id=\"spec-block-1\"\u003e\n\u003ctr style=\"box-sizing: inherit; border-bottom: 1px solid #e4e8ea;\"\u003e\n\u003ctd style=\"box-sizing: inherit; padding: 13px; font-size: 14px; height: 43px; width: 300px; font-weight: bold;\"\u003eMaterial:\u003c\/td\u003e\n\u003ctd style=\"box-sizing: inherit; padding: 13px; font-size: 14px; height: 43px;\"\u003eSchott B270\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"box-sizing: inherit; border-bottom: 1px solid #e4e8ea;\"\u003e\n\u003ctd style=\"box-sizing: inherit; padding: 13px; font-size: 14px; height: 43px; width: 300px; font-weight: bold;\"\u003eGlass thickness:\u003c\/td\u003e\n\u003ctd style=\"box-sizing: inherit; padding: 13px; font-size: 14px; height: 43px;\"\u003e1.9mm (0.07\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"box-sizing: inherit; border-bottom: 1px solid #e4e8ea;\"\u003e\n\u003ctd style=\"box-sizing: inherit; padding: 13px; font-size: 14px; height: 43px; width: 300px; font-weight: bold;\"\u003eFilter diameter:\u003c\/td\u003e\n\u003ctd style=\"box-sizing: inherit; padding: 13px; font-size: 14px; height: 43px;\"\u003e46mm (1.81\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"box-sizing: inherit; border-bottom: 1px solid #e4e8ea;\"\u003e\n\u003ctd style=\"box-sizing: inherit; padding: 13px; font-size: 14px; height: 43px; width: 300px; font-weight: bold;\"\u003eClear aperture:\u003c\/td\u003e\n\u003ctd style=\"box-sizing: inherit; padding: 13px; font-size: 14px; height: 43px;\"\u003e43mm (1.69\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"box-sizing: inherit; border-bottom: 1px solid #e4e8ea;\"\u003e\n\u003ctd style=\"box-sizing: inherit; padding: 13px; font-size: 14px; height: 43px; width: 300px; font-weight: bold;\"\u003eCoatings:\u003c\/td\u003e\n\u003ctd style=\"box-sizing: inherit; padding: 13px; font-size: 14px; height: 43px;\"\u003eDichroic, multi-layer anti-reflection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"box-sizing: inherit; border-bottom: 0px;\"\u003e\n\u003ctd style=\"box-sizing: inherit; padding: 13px; font-size: 14px; height: 43px; width: 300px; font-weight: bold;\"\u003eHousing:\u003c\/td\u003e\n\u003ctd style=\"box-sizing: inherit; padding: 13px; font-size: 14px; height: 43px;\"\u003eAluminum, black anodized\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eIn the Box\u003c\/h3\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003eCelestron Light Pollution Filter RASA 8\"\u003cbr data-mce-fragment=\"1\"\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eWarranty \u0026amp; Manuals\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003e2-Year Warranty\u003c\/p\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":43125754560741,"sku":"CEL-93614","price":406.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/celestron-light-pollution-filter-rasa-8-93614-astronomy-plus-1.webp?v=1690484651"},{"product_id":"zwo-duo-band-filter","title":"ZWO Duo-Band Filter","description":"\u003ch2\u003eZWO Duo-Band Filter\u003c\/h2\u003e\n\u003cp\u003eThe ZWO Duo-Band Filter is a dual narrowband filter primarily aimed at complementing our range of colour ASI cameras. The Duo-Band filter is aimed at the astronomer who may already own a One Shot Colour (OSC) camera and wants to image using narrowband techniques or emission objects without purchasing a mono camera, filter wheel and narrowband filter set.\u003c\/p\u003e\n\u003cp\u003eThe Duo-Band filter offers an economical entry into the world of narrowband imaging and can also offer a practical solution to imaging in light polluted urban areas.\u003c\/p\u003e\n\u003cp\u003eThe dual band pass nature of the Duo-Band filter passes light at Hα (656nm) and OIII (500nm) wavelength, and can reduce the interference from natural light sources such as moonlight, or artificial light pollution such as street lighting.\u003c\/p\u003e\n\u003cp\u003eIt can help improve the contrast and visibility of deep sky objects such as emission nebula using a OSC camera.\u003c\/p\u003e\n\u003cp\u003eIf you are looking for a solution to deep sky photography in light pollution area, then ZWO Duo-Band Filter will be a great choice.\u003c\/p\u003e\n\u003cp\u003eThe Duo-Band filter can be used with all ASI cameras and EFW Electronic Filter Wheel and comes in 1.25” and 2” sizes.\u003c\/p\u003e\n\u003ch4\u003eFeatures\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eAerometal material. Precise CNC machining;\u003c\/li\u003e\n\u003cli\u003eFine sandblasting process and anodized finish;\u003c\/li\u003e\n\u003cli\u003eExtinction treatment to prevent reflection;\u003c\/li\u003e\n\u003cli\u003eLaser engraving font that will never fade;\u003c\/li\u003e\n\u003cli\u003ePrecise double-sided optical coating;\u003c\/li\u003e\n\u003cli\u003eFine-optically polished to ensure accurate 1\/4 wavefront and \u0026lt;30 seconds parallelism over the both surfaces;\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eKindly Reminder\u003c\/h4\u003e\n\u003cp\u003eThe incoming light transmitted through the filter should be perpendicular to the filter, or the incident angle should be less than 8°. Therefore, this product is not suitable for wide-angle or ultra wide-angle lenses.\u003c\/p\u003e\n\u003cdiv style=\"text-align: center;\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cp\u003e  \u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFWHM\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e15nm (H-alpha)\n\u003cp\u003e35nm (OIII)\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSizes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1.25″ Round Mounted\n\u003cp\u003e2″ Round Mounted\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eGlass Thickness\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1.85\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSurface Quality\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e60\/40 (Refer to MIL-O-13830)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTransmission\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMore than 90% transmission at major OIII line 486.nm1, 496nm and 501nm.\n\u003cp\u003eMore than 80% transmission at Ha line 656.3nm\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSchott substrate material\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eFilter\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eCase\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eManuals \u0026amp; Warranty\u003c\/h3\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/istronomyplus.com\/fr\/pages\/zwo-warranty?_pos=1\u0026amp;_psq=zwo+warranty\u0026amp;_ss=e\u0026amp;_v=1.0\" rel=\"noopener\" target=\"_blank\"\u003eZWO 2-Years Warranty\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/istronomyplus.com\/pages\/zwo-guides-and-manuals\" rel=\"noopener\" target=\"_blank\"\u003eZWO General Product \u0026amp; Software Manuals\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/ZWO-Duo-Band-Filter-Transmission-Curve.pdf?v=1670536776\" target=\"_blank\"\u003eZWO Duo-Band Filter Transmission Curve\u003c\/a\u003e\u003c\/p\u003e","brand":"ZWO","offers":[{"title":"1.25\" Round Mounted","offer_id":43751398998245,"sku":"ZWO-DB1.25","price":139.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":43751399031013,"sku":"ZWO-DB2","price":239.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/zwo-duo-band-filter-astronomy-plus-1_116c90c8-d6e0-4f00-9651-419973ecef35.png?v=1690484790"},{"product_id":"celestron-2-oxygen-iii-narrowband-filter-93624","title":"Celestron 2\" Oxygen III Narrowband Filter (93624)","description":"\u003ch1\u003eCelestron 2\" Oxygen III Narrowband Filter\u003c\/h1\u003e\n\u003cp\u003eThe 2\" OIII narrowband filter isolates just the two doubly-ionized oxygen lines (496 and 501nm lines) emitted by planetary and emission nebulae, while blocking the rest of the overall spectrum of light. The result is extreme contrast between the black sky background and the faint photons of OIII light needed for detailed views of the Veil, Ring, Dumbbell, Crescent and Orion nebulae, among other objects.\u003cbr\u003e\u003cbr\u003eEach filter has an ultra hard, vacuum-deposited coating carefully designed to block all of the visual spectrum ranging from 400 to 700nm This eliminates the un-natural colored halos surrounding bright stars common with O III filters of less sophisticated coating technology.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eThe 2\" OIII narrowband filter isolates the two doubly-ionized oxygen lines (496 and 501 nm lines)\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eFilter has ultra-hard, vacuum-deposited coating\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eEliminates un-natural colored halos surrounding bright stars\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCelestron 2\" Oxygen III Narrowband Filter\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWarranty \u0026amp; Manuals\u003cbr\u003e\n\u003c\/h3\u003e\n\u003cp\u003e2-Year Warranty\u003c\/p\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":43125763997925,"sku":"CEL-93624","price":100.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/celestron-2-oxygen-iii-narrowband-filter-93624-astronomy-plus_0ca55fdd-9f55-429e-942c-1c52a3622404.jpg?v=1690484924"},{"product_id":"celestron-2-uhc-lpr-filter-94124","title":"Celestron 2\" UHC\/LPR Filter (94124)","description":"\u003ch2\u003eCelestron 2\" UHC\/LPR Filter\u003c\/h2\u003e\n\u003cp\u003eOur 2\" Light Pollution Reduction (LPR) Filters are designed to selectively reduce the transmission of certain wavelengths of light, specifically those produced by artificial light. This includes mercury vapor, and both high and low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. sky glow).\u003cbr\u003e\u003cbr\u003eThe ultra high contrast (UHC) LPR filter has improved contrast over the typical broadband filters. Sky background is darker, and contrast of emission nebulae are noticeably improved. The advanced technology coatings enable the filter to achieve an outstanding transmission of over 97% across the entire bandpass, with total blockage of prominent light pollution lines. The perfect filter for viewing nebula from light polluted skies, or for boosting the contrast of nebula from dark sky sites.\u003cbr\u003e\u003cbr\u003eIn addition to it's optimum spectral and optical characteristics, the UHC\/LPR filter offers important features that set it apart and result in the highest quality celestial views:\u003cbr\u003e\u003cbr\u003eThe multi-layer dielectric coatings are plasma assisted and Ionbeam hardened using the latest technology for durability and resistance to scratching.\u003cbr\u003e\u003cbr\u003eImproved transmission translates to maximum image brightness and contrast. Users of smaller, 4\"-11\" telescopes will especially appreciate the high efficiency, and larger scope users will love the rich star fields and detailed subtle nebular shadings that are left intact.\u003cbr\u003e\u003cbr\u003eThe high transmission, sharp cutoffs, and more moderate 60nm passband of the UHC\/LPR filter retains a more natural view, yet significantly boosts overall contrast. Imagers will appreciate the broader bandpass and inclusion of an extremely efficient H-Alpha passband (656nm).\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eOur 2\" Light Pollution Reduction (LPR) Filters are designed to selectively reduce the transmission of certain wavelengths of light, specifically those produced by artificial light\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eIn the Box\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCelestron 2\" UHC\/LPR Filter\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eWarranty \u0026amp; Manuals\u003cbr data-mce-fragment=\"1\"\u003e\n\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003e2-Year Warranty\u003c\/p\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":43125764292837,"sku":"CEL-94124","price":174.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/celestron-2-uhclpr-filter-94124-astronomy-plus-1.webp?v=1690484924"},{"product_id":"celestron-1-25-uhc-lpr-filter-94123","title":"Celestron 1.25\" UHC\/LPR Filter (94123)","description":"\u003ch2\u003eCelestron 1.25\" UHC\/LPR Filter\u003c\/h2\u003e\n\u003cp\u003eOur 1-1\/4\" Light Pollution Reduction (LPR) Filters are designed to selectively reduce the transmission of certain wavelengths of light, specifically those produced by artificial light. This includes mercury vapor, and both high and low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. sky glow).\u003cbr\u003e\u003cbr\u003eThe ultra high contrast (UHC) LPR filter has improved contrast over the typical broadband filters. Sky background is darker, and contrast of emission nebulae are noticeably improved. The advanced technology coatings enable the filter to achieve an outstanding transmission of over 97% across the entire bandpass, with total blockage of prominent light pollution lines. The perfect filter for viewing nebula from light polluted skies, or for boosting the contrast of nebula from dark sky sites.\u003cbr\u003e\u003cbr\u003eIn addition to it's optimum spectral and optical characteristics, the UHC\/LPR filter offers important features that set it apart and result in the highest quality celestial views:\u003cbr\u003e\u003cbr\u003eThe multi-layer dielectric coatings are plasma assisted and Ionbeam hardened using the latest technology for durability and resistance to scratching.\u003cbr\u003e\u003cbr\u003eImproved transmission translates to maximum image brightness and contrast. Users of smaller, 4\"-11\" telescopes will especially appreciate the high efficiency, and larger scope users will love the rich star fields and detailed subtle nebular shadings that are left intact.\u003cbr\u003e\u003cbr\u003eThe high transmission, sharp cutoffs, and more moderate 60nm passband of the UHC\/LPR filter retains a more natural view, yet significantly boosts overall contrast. Imagers will appreciate the broader bandpass and inclusion of an extremely efficient H-Alpha passband (656nm).\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eIn the Box\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCelestron 1.25\" UHC\/LPR Filter\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eWarranty \u0026amp; Manuals\u003cbr data-mce-fragment=\"1\"\u003e\n\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003e2-Year Warranty\u003c\/p\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":43125764325605,"sku":"CEL-94123","price":132.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/celestron-1-25-uhclpr-filter-94123-astronomy-plus.webp?v=1690484924"},{"product_id":"optolong-l-enhance-filter","title":"Optolong L-eNhance Duo Band Filter","description":"\u003ch1\u003eOptolong L-eNhance Duo Band Filter\u003c\/h1\u003e\n\u003cp data-mce-fragment=\"1\"\u003eThe relentless spread or urbanization and its associated light pollution have become a growing problem for all amateur astro photographers. The current solutions to the problem can be expensive and might include the purchase of a monochrome camera, several types of narrowband filters and a filter wheel. The filter is available in the following sizes: 1.25″, 2″ \u0026amp; clip filter for Canon EOS. The clip version is compatible with all Canon EF lenses, but doesn’t suit Canon EF-S lenses. The following cameras are compatible: 7D2, 80D, 800D, 77D, 70D, 760D, 750D, 700D, 650D, 600D, 550D, 500D, 400D, 100D, 1100D, 1200D \u0026amp; 1300D.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eThe Optolong L-eNhance Filterprovides an economical and practical solution for amateurs. It is a dual-band pass filter which has been designed for DSLR (digital SLR), color CMOS and monochrome CCD cameras. The convenience and cost effectiveness of this filter allows amateurs to image a rich selection of astronomical images, even in bright, heavily light-polluted areas. Optolong believes the design of our L-eNhance filter is a technical innovation among filters. It effectively isolates the H-Alpha, H-Beta, and Oxygen III nebula emission lines and achieves a maximum transmission of up to 90%. The performance of this filter delivers images that superbly control the impact from light polluted skies.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eHydrogen is the largest, the most primitive, the simplest, and the oldest element in the universe. Scientists consider that Hydrogen amounts to more than 90% of visible substance in space. Our sun is 5 billion years old, but so far hydrogen is still the key matter of nuclear fusion. While the sulfur element does not have much scientific significance, so keeping H and O is meaning for exploration of life.\u003cbr data-mce-fragment=\"1\"\u003eTherefore, we highlight H-a, H-b, O3 and O2, and reduce the signal of sulfur.\u003c\/p\u003e\n\u003ch4 data-mce-fragment=\"1\"\u003eMain Use and Performance\u003c\/h4\u003e\n\u003cp data-mce-fragment=\"1\"\u003eSuitable for visual observation and astrophotography.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eLight pollution filter do not eliminate the effects of light pollution or increase the object’s brightness. In many cases, they increase the contrast between nebula and night sky, not brightening the nebula.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eWARNING: The filters of Optolong are not designed for sun observation. DO NOT LOOK AT THE SUN WITH OPTOLONG FILTER. You would be BLIND if you fail to observe the warning.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cem\u003e\u003cstrong\u003eL-Enhance Performance\u003c\/strong\u003e\u003c\/em\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cimg src=\"https:\/\/www.optolong.com\/uploads\/images\/20210703\/48c07ebe8a88353aa27c0031c7e973d0.png\"\u003e\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications:\u003c\/h3\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong data-mce-fragment=\"1\"\u003eSpectrum and Characteristic\u003c\/strong\u003e\u003c\/em\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u003cem\u003eSbustrate:\u003c\/em\u003e B270\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cem\u003eThickness:\u003c\/em\u003e 1.85mm\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u003cem\u003eTpeak:\u003c\/em\u003e  T\u0026gt;90%\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u003cem\u003eBlocking range:\u003c\/em\u003e 300-1000nm\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u003cem\u003eBlocking depth:\u003c\/em\u003e light pollution  line blocking \u0026gt;99%\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u003cem\u003eSurface quality:\u003c\/em\u003e 60\/40\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u003cem\u003eTransmitted Wavefront RMS:\u003c\/em\u003e λ\/4\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u003cem\u003eParallelism:\u003c\/em\u003e 30s\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003eMajor Emission Lines of Nebulae : \u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eH-Alpha : 656.3nm\u003c\/li\u003e\n\u003cli\u003eH-Beta : 486.1nm\u003c\/li\u003e\n\u003cli\u003eOIII : 495.nm \u0026amp; 500.7 nm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch3\u003eManuals \u0026amp; Warranty\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eOptolong 3-Years Warranty\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Optolong","offers":[{"title":"1.25\"","offer_id":43697303257317,"sku":"OL-L-ENHANCE-1.25","price":250.0,"currency_code":"CAD","in_stock":true},{"title":"2\"","offer_id":43697303290085,"sku":"OL-L-ENHANCE-2","price":320.0,"currency_code":"CAD","in_stock":true},{"title":"EOS-C Clip","offer_id":43697303322853,"sku":"OL-L-ENHANCE-EOS","price":362.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/optolong-l-enhance-filter-astronomy-plus-1.webp?v=1690485404"},{"product_id":"optolong-l-extreme-dual-band-narrow-band-filter-l-extreme","title":"Optolong L-Extreme Dual-Band Filter","description":"\u003ch1\u003eOptolong L-Extreme Dual-Band Astronomy NarrowBand Filter\u003c\/h1\u003e\n\u003cp\u003eThe advantage of the L-eXtreme filter is that there is no transmission between the H-beta and OIII lines and there are also no nebula emission lines there. In this case, it isn’t letting light pollution come through so it maximizes nebula signals and the sky background is made darker while imaging.\u003c\/p\u003e\n\u003cp\u003eThe L-eXtreme filter should better isolate the emission lines and better protect from light pollution.\u003c\/p\u003e\n\u003ch4\u003eL-Extreme Introduction\u003c\/h4\u003e\n\u003cp\u003eOptolong L-eXtreme is a two 7 nm bandpass filter which can be used with one-shot color cameras like DSLR’s (digital SLR), and monochrome CCD cameras, it is also more suited for fast systems. The convenience and cost-effectiveness of this filter allows amateurs to image a rich emission nebula, even in bright, light pollution skies. Optolong believes the design of L-eXtreme filter would be a better choice for fast systems at a competitive price. It isolates the H-alpha, and Oxygen-iii nebula emission lines so that the contrast and signal-to-noise ratio between nebulae were maximized. For people who are living in very light-polluted areas, or when the moon is out, the L-eXtreme will be a good filter.\u003c\/p\u003e\n\u003cp\u003eUnlike the L-eNhance filter which is a tri-band (transmits H-b, H-a, and O-iii), the L-eXtreme filter is dual-band that passes H-a and O-iii emission lines.\u003c\/p\u003e\n\u003cp\u003eHydrogen is the largest, the most primitive, the simplest, and the oldest element in the universe. Scientists consider that Hydrogen amounts to more than 90% of visible substance in space. Our sun is 5 billion years old, but so far hydrogen is still the key matter of nuclear fusion. While the sulfur element does not have much scientific significance, so keeping H and O for the exploration of life.\u003c\/p\u003e\n\u003cp\u003eTherefore, Optolong highlights H-a, H-b, O-iii, and O-ii, and reduce the signal of sulfur.\u003c\/p\u003e\n\u003ch4\u003eL-eXtreme Performance:\u003c\/h4\u003e\n\u003cp\u003e\u003cu\u003e\u003cstrong\u003eI. Compare: L-eXtreme VS no filter © Vincent Cheng\u003c\/strong\u003e\u003c\/u\u003e \u003cimg height=\"489\" width=\"457\" alt=\"\" src=\"http:\/\/www.optolong.com\/uploads\/images\/20200716\/5bcdb1e79c79231df851f9b60f152ba9.png\" class=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cu\u003e\u003cstrong\u003eII. NGC6946, Barnard 150 \u0026amp; Sh2-129 Flying Bat nebula ©José Jiménez\u003c\/strong\u003e\u003c\/u\u003e NGC6946, Barnard 150 \u0026amp; Sh2-129 Flying Bat nebula Canon 6D mod \u0026amp; WO SpaceCat 51 RGB 25 x 600\" ISO 3200 - Optolong L-Pro H-Alpha \u0026amp; OIII 20 x 1500\" ISO 3200 -\u003cu\u003e \u003cstrong\u003eOptolong L-eXtreme\u003c\/strong\u003e\u003c\/u\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg height=\"252\" width=\"503\" alt=\"\" src=\"http:\/\/www.optolong.com\/uploads\/images\/20200716\/1840a8e24b716e2297a92bd4aa933ede.jpg\" class=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cu\u003e\u003cstrong\u003eIII. The Rosette and Cone Nebulas ©Starizona\u003c\/strong\u003e\u003c\/u\u003e The image of the Rosette and Cone Nebulas is an example under about the worst conditions: a very wide field of view (135mm lens, 8 x 5.5 degrees), a very fast focal ratio (f\/1.8) and with the 58% illuminated moon only 17 degrees outside the field of view!  It is 20 exposures of 90 seconds each with the ZWO ASI294.\u003c\/p\u003e\n\u003cp\u003e\u003cimg height=\"343\" width=\"500\" alt=\"\" src=\"http:\/\/www.optolong.com\/uploads\/images\/20200716\/5d3cbec016b1e67e43be0157c53c10a8.jpg\" class=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cu\u003e\u003cstrong\u003eIV. IC1396 Elephant Trunk nebula ©José Jiménez \u003c\/strong\u003e\u003c\/u\u003e A new job with Optolong L-eXtreme filter and the new Askar Lens FRA 400 tube; IC1396 Elephant Trunk nebula La Jonquera - Girona - Spain May 2020 Equipment used : Canon 6D mod Askar FRA 400mm Sharpstar Optics Fong Michael RGB 6 x 1500\" ISO 6400 \u003cu\u003e\u003cstrong\u003eOptolong L-eXtreme\u003c\/strong\u003e\u003c\/u\u003e Sky Watcher EQ6 Mount Guide camera QHY5 Flats, Darks \u0026amp; Bias Calibrated, stacked and processed with Pixinsight, final tweaks with Lightroom\u003c\/p\u003e\n\u003cp\u003e\u003cimg height=\"331\" width=\"504\" alt=\"\" src=\"http:\/\/www.optolong.com\/uploads\/images\/20200716\/fd6ecb8b50249153970ab1b4eb64223e.jpg\" class=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cu\u003e\u003cstrong\u003eV. NGC6188 Fighting Dragons of Ara  ©Tommy Lim KW  \u003c\/strong\u003e\u003c\/u\u003e OBJECTS: NGC6188 FIGHTING DRAGONS OF ARA LOCATION: MERSING, JOHOR CAMERA: QHY168C TELESCOPE: 4\" REFRACTOR MOUNT: SKYWATCHER AZ-EQ5GT FILTERS: OPTOLONG L-EXTREME FILTER. EXPOSURE: 30 X 300SEC Stacked in Siril and processed in Pixinsight.\u003c\/p\u003e\n\u003cp\u003e\u003cimg height=\"327\" width=\"508\" alt=\"\" src=\"http:\/\/www.optolong.com\/uploads\/images\/20200716\/e2b193114d02ba2a75138093d52f0e1c.jpg\" class=\"\"\u003e \u003cstrong\u003eWarm prompt\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAbout color: due to the influence of ambient light, color difference of the display and flash photography, the color of the product may have some color difference. Detailed color is in accordana with the final product.\u003c\/li\u003e\n\u003cli\u003eAbout coating: the interference filter will show different colors under different light, which is a normal phenomenon. Please refer to the material object.\u003c\/li\u003e\n\u003cli\u003eAbout the style: in order to improve the product, the change of design\/appearance\/parameters has not been updated in time. Please see the subject produce.\u003c\/li\u003e\n\u003cli\u003eAbout the description: the series of this product have the same material, technology and design, different sizes only, please note.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ch4\u003eSpectrum and Characteristic:\u003c\/h4\u003e\n\u003cp\u003e\u003cspan\u003eSbustrate: B270\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eThickness: 1.85mm\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eTpeak:  T\u0026gt;90%\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eBlocking range: 300-1000nm\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eBlocking depth: light pollution  line blocking \u0026gt;99%\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eSurface quality: 60\/40\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eTransmitted Wavefront RMS: λ\/4\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eParallelism: 30s\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eHow to read the chart?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e▲The horizontal axis is the Wavelength in Nanometers(nm).\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e▲The vertical axis is transmission in %.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e▲The \u003cspan style=\"color: #bc1f1f;\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eRED\u003c\/strong\u003e\u003c\/span\u003e line shows the line of H-alpha.\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cspan data-mce-fragment=\"1\" style=\"color: #038b0b;\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eGREEN\u003c\/strong\u003e\u003c\/span\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003eline shows the emmission of OIII. The artifical emission lines are shown in \u003cspan data-mce-fragment=\"1\"\u003e\u003cspan style=\"color: #ff8000;\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eORANGE\u003c\/strong\u003e\u003c\/span\u003e.\u003c\/span\u003e\u003cimg height=\"110\" width=\"668\" data-mce-fragment=\"1\" data-ll-status=\"loaded\" alt=\"\" src=\"http:\/\/www.optolong.com\/uploads\/images\/20191111\/0ff2d7f395c427aa390ff53daf333cec.jpg\" class=\"aligncenter lazyloaded\"\u003e\u003c\/p\u003e\n\u003ch4\u003eCoating Technology\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eMulti-layers anti-reflection coating\u003c\/li\u003e\n\u003cli\u003eNon-cementing optical substrate coating\u003c\/li\u003e\n\u003cli\u003eOptolong filter adopts precision coating based on Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL (central wavelength) no deviation affected by temperature change.\u003c\/li\u003e\n\u003cli\u003ePlanetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and Optical density of off-band.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cem\u003ePacking\u003c\/em\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eOuter Box: silve box\u003c\/li\u003e\n\u003cli\u003ePlastic Box: PP material\u003c\/li\u003e\n\u003cli\u003eLining: imported high pressure white EVA material\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cbr\u003e\u003c\/h3\u003e\n\u003cul\u003e\u003c\/ul\u003e","brand":"Optolong","offers":[{"title":"1.25\"","offer_id":43697369940197,"sku":"OL-L-EXTREME-1","price":334.0,"currency_code":"CAD","in_stock":true},{"title":"2\"","offer_id":43697369972965,"sku":"OL-L-EXTREME-2","price":432.0,"currency_code":"CAD","in_stock":true},{"title":"Nikon Z mirroless mount","offer_id":48076800622821,"sku":"OL-L-EXTREME-NK-Z","price":363.0,"currency_code":"CAD","in_stock":true},{"title":"EOS-R","offer_id":48076800655589,"sku":"OL-L-EXTREME-EOS-R","price":363.0,"currency_code":"CAD","in_stock":true},{"title":"Sony-FF","offer_id":48076800688357,"sku":"OL-L-EXTREME-S-FF","price":363.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/optolong-l-extreme-dual-band-filter-astronomy-plus-1.webp?v=1690487119"},{"product_id":"optolong-moon-skyglow-filter","title":"Optolong Moon \u0026 Skyglow Filter","description":"\u003ch2\u003eOptolong Moon \u0026amp; Skyglow Filter\u003c\/h2\u003e\n\u003cp\u003eOptolong Moon \u0026amp; Skyglow filter is designed to darken the background sky by blocking light transmission from skyglow 589nm and many street light emissions from artificial light. Its high efficiency preserves image brightness, reveals more details and increases contrast of moon, galaxies, nebulae and globular star clusters.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMain Use\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIdeally it is quite versatile filter for visual observation and astrophotography on planetary nebula.\u003c\/p\u003e\n\u003cp\u003eWARNING: The filters of Optolong are not designed for sun observation. DO NOT LOOK AT THE SUN WITH OPTOLONG FILTER. You would be BLIND if you fail to observe the warning.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eSubstrate: B270\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eThickness: 1.85mm\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eTave:  T\u0026gt;90%\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eBlocking range: 350-1050nm\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eBlocking depth: light pollution  line blocking \u0026gt;99%\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eSurface quality: 60\/40\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eTransmitted Wavefront RMS: λ\/4\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eParallelism: 30s\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003eIn the Box\u003cbr\u003e\n\u003c\/h3\u003e\n\u003cp\u003eFilter\u003c\/p\u003e\n\u003ch3\u003eManuals \u0026amp; Warranty\u003c\/h3\u003e\n\u003cp\u003eOptolong 3-Years Warranty\u003c\/p\u003e","brand":"Optolong","offers":[{"title":"1.25\"","offer_id":43697646797029,"sku":"OL-MS-125","price":44.0,"currency_code":"CAD","in_stock":true},{"title":"2\"","offer_id":43697646829797,"sku":"OL-MS-2","price":67.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/optolong-moon-and-skyglow-filter-astronomy-plus_12f07d3e-7f96-47c6-b542-daadc6113c09.png?v=1690487285"},{"product_id":"astronomik-cls-ccd-filter","title":"Astronomik CLS-CCD filter","description":"\u003ch2\u003eAstronomik CLS-CCD filter\u003c\/h2\u003e\n\u003cp\u003eThe Astronomik CLS CCD is suitable under light-polluted skies for DSLR Cameras, which have been remodeled for astronomical use. The filter enhances the contrast between all deep-sky objects and the background. The CLS-CCD Filter enhances the contrast between astronomical objects and the background. Due to the wider transmission curve compared to UHC filters, a greater amount of light will pass the filter. Stars will be less dimmed. This filter has been optimized to block as much spurious light as possible and simultaneously provide the best performance for 'useful' light. A good filter for DSLR-, CCD- and film b\/w-photography as well as observation of deep-sky-objects with telescopes or photo lenses of all aperture f\/2 and above.\u003c\/p\u003e\n\u003ch4\u003e\u003cstrong\u003eMain use\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cp\u003eThe filter blocks completely emission lines of artificial light sources like streetlights (e.g. sodium- and mercury-vapor) as well as the airglow. All 'important' emission lines as well as the spectral range of the night-adapted eye are being passed. The supplementary IR-blocking layer allows the use of DSLR- and Webcams without an integrated IR-block filter.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eOther uses\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eEasier resolution of Double Stars.\u003c\/li\u003e\n\u003cli\u003eWith the EOS-Clip model, photography with DSLR cameras is feasible even under extreme light-polluting conditions without shifting the white balance.\u003c\/li\u003e\n\u003cli\u003eThe 1,25\" and 2\" socket models can be used for observations from light-polluted areas.\u003c\/li\u003e\n\u003cli\u003eIf you plan to create color images from emission line data, our CLS-CCD filter is a great choice for the Luminance channel\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003e\u003cstrong\u003eAlternatives\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cp\u003eCLS: For cameras with an integrated IR-filter or for visual observation.\u003c\/p\u003e\n\u003ch4\u003eSuitability of the Astronomik CLS CCD filters\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCMOS and CCD photography\u003c\/strong\u003e: Very good blocking of light-pollution\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDSLR photography (original)\u003c\/strong\u003e: Good, color balance is shifted but contrast is enhanced\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDSLR photography (astro-modified)\u003c\/strong\u003e: Very good, color balance is close to perfect\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDSLR photography (MC-modified)\u003c\/strong\u003e: Very good, color balance is close to perfect\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eClip-Filters for mirrorless Canon EOS R APS-C cameras\u003c\/h4\u003e\n\u003cp\u003eCanon EOS R APS-C series cameras are an excellent choice for astrophotography. With Astronomik Clip-Filters, you can use our full range of filters with your camera to capture stunning images. Whether paired with a camera lens or a telescope, our clip filters ensure maximum image quality and performance from your setup.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThe Astronomik Clip-Filters offer a number of practical advantages that make them an ideal choice for astrophotographers:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eInstalling and removing the Astronomik Clip-Filter is very quick and easy and requires no extra tools or modifications to the camera body. They can be changed at any time, even at night.\u003c\/li\u003e\n\u003cli\u003eAll lens functions, such as focus, aperture, and image stabilization remain fully functional.\u003c\/li\u003e\n\u003cli\u003eThe Astronomik Clip-Filters are held securely in place without stressing the high-quality glass.\u003c\/li\u003e\n\u003cli\u003eThe Astronomik Clip-Filters are designed and optimized for use with both standard camera lenses and telescopes.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eThrough the Astronomik Clip-Filters, we were able to solve several common issues faced by astrophotographers:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eLarge filters for large camera lenses are very expensive.\u003c\/li\u003e\n\u003cli\u003eUsing a filter holder between the camera body and the lens prevents focusing to infinity.\u003c\/li\u003e\n\u003cli\u003eFor very fast telescopes (low f-number) like the Vixen R200SS or the Takahashi “Epsilon” astrograph, a filter drawer or filter wheel can not be used because the distance to the corrector lenses would be changed.\u003c\/li\u003e\n\u003cli\u003eLong exposure times lead to dust settling on the camera’s sensor chip.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eAdditionally, all Astronomik EOS R APS-C Clip-Filters serve as an excellent dust shield, protecting the sensor during long exposures. If you only need a dust shield without filtering effects, the Astronomik MC-Clear EOS R APS-C Clip-Filter is the right choice.\u003c\/p\u003e\n\u003cp\u003eUse Astronomik filters for your Canon EOS R APS-C camera and enjoy marvelous images with an ultra-light equipment!\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #b13b3c;\"\u003eNOTE: Please store the Clip-Filter in the supplied storage box and do not leave it in the camera permanently.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch4\u003eCompatible Canon EOS R APS-C cameras\u003c\/h4\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left;\"\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth style=\"text-align: center;\"\u003e\u003cstrong\u003eCompatibility\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left;\"\u003eCanon EOS R7\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\"\u003e\u003cimg src=\"https:\/\/www.astronomik.com\/media\/c5\/79\/36\/1775813946\/Haken.svg?ts=1775813946\" style=\"width: 23px; height: 18px;\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left;\"\u003eCanon EOS R10\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\"\u003e\u003cimg src=\"https:\/\/www.astronomik.com\/media\/c5\/79\/36\/1775813946\/Haken.svg?ts=1775813946\" style=\"width: 23px; height: 18px;\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left;\"\u003eCanon EOS R50\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\"\u003e\u003cimg src=\"https:\/\/www.astronomik.com\/media\/c5\/79\/36\/1775813946\/Haken.svg?ts=1775813946\" style=\"width: 23px; height: 18px;\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left;\"\u003eCanon EOS R50 V\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\"\u003e\u003cimg src=\"https:\/\/www.astronomik.com\/media\/c5\/79\/36\/1775813946\/Haken.svg?ts=1775813946\" style=\"width: 23px; height: 18px;\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left;\"\u003eCanon EOS R100\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\"\u003e\u003cimg src=\"https:\/\/www.astronomik.com\/media\/c5\/79\/36\/1775813946\/Haken.svg?ts=1775813946\" style=\"width: 23px; height: 18px;\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch4\u003eNon-compatible Canon lenses\u003c\/h4\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left;\"\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth style=\"text-align: center;\"\u003e\u003cstrong\u003eCompatibility\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left;\"\u003eCanon RF 14mm f\/1.4 L VCM\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\"\u003e\u003cimg src=\"https:\/\/www.astronomik.com\/media\/9e\/75\/05\/1775813946\/Kreuz.svg?ts=1775813946\" style=\"width: 18px; height: 18px;\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left;\"\u003eCanon RF 28mm F2.8 STM\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\"\u003e\u003cimg src=\"https:\/\/www.astronomik.com\/media\/9e\/75\/05\/1775813946\/Kreuz.svg?ts=1775813946\" style=\"width: 18px; height: 18px;\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left;\"\u003eCanon RF 35mm F1.8 IS Macro STM\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\"\u003e\u003cimg src=\"https:\/\/www.astronomik.com\/media\/9e\/75\/05\/1775813946\/Kreuz.svg?ts=1775813946\" style=\"width: 18px; height: 18px;\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left;\"\u003eCanon RF 85mm F1.2L USM\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\"\u003e\u003cimg src=\"https:\/\/www.astronomik.com\/media\/9e\/75\/05\/1775813946\/Kreuz.svg?ts=1775813946\" style=\"width: 18px; height: 18px;\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left;\"\u003eCanon Extender RF 2x\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\"\u003e\u003cimg src=\"https:\/\/www.astronomik.com\/media\/9e\/75\/05\/1775813946\/Kreuz.svg?ts=1775813946\" style=\"width: 18px; height: 18px;\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left;\"\u003eCanon Extender RF 1.4x\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\"\u003e\u003cimg src=\"https:\/\/www.astronomik.com\/media\/9e\/75\/05\/1775813946\/Kreuz.svg?ts=1775813946\" style=\"width: 18px; height: 18px;\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eAstronomik filters are diffraction-limited, ensuring that the optical performance (resolution and contrast) of your telescope is not compromised. Thanks to the high-precision machining of the glas substrate, all Astronomik filters are parfocal. The wedge errors are far below all common tolerances. Therefore, all issues concerning focal distances and the exact alignment of images from each color channel are effectively eliminated.\u003c\/p\u003e\n\u003cp\u003eAll Astronomik filters are ideal for modern cameras, including both CMOS- and CCD-based models, ensuring you capture the best possible images with your equipment. Sharpness, contrast, and the absence of any reflections and halos are guaranteed. Even with bright stars in the field of view, nebulae and galaxies will be captured with the finest structures. The Astronomik MFR and MaxFR coatings are designed for optimal performance across a wide range of focal ratios of the optics used.\u003c\/p\u003e\n\u003cp\u003eEvery Astronomik filter undergoes a rigorous quality control process before delivery.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications \u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e95% transmission at 486nm (H-beta)\u003c\/li\u003e\n\u003cli\u003e95% transmission at 496nm (OIII)\u003c\/li\u003e\n\u003cli\u003e95% transmission at 501nm (OIII)\u003c\/li\u003e\n\u003cli\u003e97% transmission at 656nm (H-alpha)\u003c\/li\u003e\n\u003cli\u003eTransmission range: 450 to 520nm and 640 to 690nm\u003c\/li\u003e\n\u003cli\u003eGlass thickness: 1mm (except Astronomik OWB Type 3 and XT filters)\u003c\/li\u003e\n\u003cli\u003eFinely polished optical glass, free of any striae, residual stresses, and bubbles\u003c\/li\u003e\n\u003cli\u003eExtremely scratch-resistant and durable coating\u003c\/li\u003e\n\u003cli\u003eCompletely resistant against high humidity and aging effects\u003c\/li\u003e\n\u003cli\u003eParfocal with other Astronomik filters\u003c\/li\u003e\n\u003cli\u003eDiffraction-limited\u003c\/li\u003e\n\u003cli\u003eOptimized spectral windows\u003c\/li\u003e\n\u003cli\u003eDelivered in a high-quality, long-lasting filter box\u003c\/li\u003e\n\u003cli\u003eMade in Germany\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cp\u003eCLS-CCD filter, at selected size. \u003c\/p\u003e\n\u003ch3 role=\"tabpanel\" aria-hidden=\"false\" aria-labelledby=\"tab-title-3\" data-content=\"tab-3\" class=\"tab__content tab.box tab__content--active\"\u003e\n\u003cspan\u003eManual \u0026amp; Warranty\u003c\/span\u003e\u003cbr\u003e\n\u003c\/h3\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.astronomik.com\/en\/warranty-garantie.html\"\u003eAstronomik\u003cspan\u003e \u003c\/span\u003e\u003c\/a\u003e10 year warranty\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Astronomik","offers":[{"title":"1.25\"","offer_id":43458866708709,"sku":"AK-8H00DP","price":135.0,"currency_code":"CAD","in_stock":true},{"title":"2\"","offer_id":43458866741477,"sku":"AK-8H00DQ","price":312.0,"currency_code":"CAD","in_stock":true},{"title":"31mm Round","offer_id":43458866774245,"sku":"AK-8H00FG","price":176.0,"currency_code":"CAD","in_stock":true},{"title":"36mm Round","offer_id":43458866807013,"sku":"AK-8H00FH","price":189.0,"currency_code":"CAD","in_stock":true},{"title":"50mm Round","offer_id":43458866839781,"sku":"AK-8H00EH","price":312.0,"currency_code":"CAD","in_stock":true},{"title":"50 mm Square","offer_id":43458866872549,"sku":"AK-8H00EK","price":325.0,"currency_code":"CAD","in_stock":true},{"title":"Clip-Filter EOS APS-C","offer_id":43458866905317,"sku":"AK-8H00DN","price":216.0,"currency_code":"CAD","in_stock":true},{"title":"Canon EOS XL","offer_id":43458866938085,"sku":"AK-8H00LD","price":325.0,"currency_code":"CAD","in_stock":true},{"title":"EOS M Clip","offer_id":43458866970853,"sku":"AK-8H00R7","price":216.0,"currency_code":"CAD","in_stock":true},{"title":"EOS R APS-C","offer_id":48894932484325,"sku":"AK-8h11va","price":257.0,"currency_code":"CAD","in_stock":true},{"title":"EOS XT Clip EOS APS-C","offer_id":43458867003621,"sku":"AK-8H00KF","price":244.0,"currency_code":"CAD","in_stock":true},{"title":"Nikon XL Clip","offer_id":43458867036389,"sku":"AK-8H11AT","price":325.0,"currency_code":"CAD","in_stock":true},{"title":"Nikon Z XL Clip","offer_id":43458867069157,"sku":"AK-8H11KY","price":339.0,"currency_code":"CAD","in_stock":true},{"title":"Pentax K-1 Clip","offer_id":43458867101925,"sku":"AK-8H11EG","price":339.0,"currency_code":"CAD","in_stock":true},{"title":"SC Rear Cell","offer_id":43458867134693,"sku":"AK-8H00EF","price":339.0,"currency_code":"CAD","in_stock":true},{"title":"T-Thread","offer_id":43458867167461,"sku":"AK-8H00ED","price":257.0,"currency_code":"CAD","in_stock":true},{"title":"Clip-filter EOS R XL","offer_id":44127478677733,"sku":"AK-8h11ga","price":339.0,"currency_code":"CAD","in_stock":true},{"title":"Clip-filter Sony Alpha 7","offer_id":44127478710501,"sku":"AK-8h00xb","price":325.0,"currency_code":"CAD","in_stock":true},{"title":"M49","offer_id":44127539658981,"sku":"AK-8h00tt","price":312.0,"currency_code":"CAD","in_stock":true},{"title":"M52","offer_id":44127539691749,"sku":"AK-8h00tu","price":325.0,"currency_code":"CAD","in_stock":true},{"title":"M55","offer_id":44127539724517,"sku":"AK-8h00tv","price":679.0,"currency_code":"CAD","in_stock":true},{"title":"M58","offer_id":44127539757285,"sku":"AK-8h00tw","price":679.0,"currency_code":"CAD","in_stock":true},{"title":"M62","offer_id":44127539790053,"sku":"AK-8h00tx","price":707.0,"currency_code":"CAD","in_stock":true},{"title":"M67","offer_id":44127539822821,"sku":"AK-8h00ty","price":720.0,"currency_code":"CAD","in_stock":true},{"title":"M72","offer_id":44127539855589,"sku":"AK-8h00em","price":720.0,"currency_code":"CAD","in_stock":true},{"title":"M77","offer_id":44127539888357,"sku":"AK-8h00u0","price":720.0,"currency_code":"CAD","in_stock":true},{"title":"27mm unmounted","offer_id":44127553585381,"sku":"AK-8h00l4","price":135.0,"currency_code":"CAD","in_stock":true},{"title":"42mm unmounted","offer_id":44127553618149,"sku":"AK-8h11b4","price":216.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/astronomik-cls-ccd-filter-astronomy-plus-1.jpg?v=1690487958"},{"product_id":"askar-color-magic-3nm-deep-sky-narrowband-filter","title":"Askar Color Magic 3nm Duo-Narrowband Filter (CM-3nm)","description":"\u003ch1\u003e\u003cspan\u003eAskar Color Magic 3nm Duo-Narrowband Filter\u003c\/span\u003e\u003c\/h1\u003e\n\u003cp\u003e\u003cspan\u003eFor all astrophotography enthusiasts, filters are one of the indispensable accessories to achieve perfect deep-sky imaging. The dedicated astronomy filters for deep-sky imaging can effectively eliminate the influence from the background light and enhance the contract of your photographs and make the targets displayed more clearly and delicately. Askar’ s new-launched 3nm deep-sky narrowband filter set Color Magic is a professional astrophotography tool specifically designed for deep-sky imaging.\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cspan\u003eCompared with the previous Askar 5nm deep-sky filters, this filter set has a narrower bandwidth. Therefore, even if your are at an area affected by the urban light pollution, night glow and other undesired light, you can capture high-quality deep-sky pictures with the help of Askar 3nm narrowband filters. The narrower bandwidth and efficient light transmission considerably enhance the contrast of your pictures, making it easier to display the details of the stars that otherwise are fairly difficult to spot.\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cspan\u003eAt the same time, the Color Magic 3nm deep-sky narrowband filter has very good halation control, providing more contribution to your astrophotography.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eAskar 3nm Duo-Band Filter\u003c\/strong\u003e\u003cbr\u003e \u003cbr\u003eAskar 3nm duo-band filter has an extremely narrow bandwidth, and an ultra-high transmittance over 88% at its center wavelength (500.7nm and 656.3nm). Askar 3nm duo-band filter can effectively eliminate the influence of light pollution. Even if you are in an area seriously affected by light pollution, the pictures taken with the Askar 3nm duo-band filter are still very good. It is so practical and efficient that you can get astronomical images of high quality with just one duo-band filter and an ordinary astronomical colour camera.\u003cbr\u003e \u003cbr\u003eThe Askar 3nm duo-band filter is ideal for photographing emission nebulae, planetary nebulae or supernova remnants, and has a very high transmittance at the central wavelength. The highly narrow bandwidth of the filter effectively blocks out the effects of light pollution or other distracting factors such as night glow.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg src=\"https:\/\/www.askarlens.com\/Upload\/165951381275.jpg\" width=\"604\" height=\"206\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"font-weight: 400;\"\u003e\u003cimg src=\"https:\/\/www.askarlens.com\/Upload\/Image23-2(1).jpg\" width=\"519\" height=\"523\"\u003e\u003cbr\u003e\u003cstrong\u003e NGC7000\u003c\/strong\u003e\u003cbr\u003eSky-Watcher 150P newtonian\u003cbr\u003eZWO asi533mc pro\u003cbr\u003eASKAR Colour Magic 3nm Duo Narrowband Filter\u003cbr\u003e70x300″\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg src=\"https:\/\/www.askarlens.com\/Upload\/_6888_ABE_ABE-ps-(1).jpg\" width=\"520\" height=\"442\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"font-weight: 400;\"\u003e\u003cstrong\u003eNGC6888\u003c\/strong\u003e\u003cbr\u003eSky-Watcher 150P newtonian\u003cbr\u003eZWO asi533mc pro\u003cbr\u003eASKAR Colour Magic 3nm Duo Narrowband Filter\u003cbr\u003e42x300″\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg src=\"https:\/\/www.askarlens.com\/Upload\/Image26da(1).jpg\" width=\"518\" height=\"518\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"font-weight: 400;\"\u003e\u003cstrong\u003eM8\u003c\/strong\u003e\u003cbr\u003eSkyrover 80APO PRO\u003cbr\u003eZWO asi533mc pro\u003cbr\u003eASKAR Colour Magic 3nm Duo Narrowband Filter\u003cbr\u003e36x300″\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003e3nm Duo-Band Filter 2”\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eFWHM: 3nm\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eCWL: 500.7nm \u0026amp; 656.3nm\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003ePeak transmittance：88%\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eThickness：1.85 ± 0.05mm\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eBarrier property：≥OD5 @ 200-1100nm\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eSurface finish：60\/40\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eParallelism：30″\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFilter\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"value\"\u003e\n\u003ch3\u003eWarranty \u0026amp; Manuals\u003c\/h3\u003e\n\u003cp\u003eAskar Warranty\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":43628298895589,"sku":"ASK-CM-3nm","price":500.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/askar-color-magic-3nm-deep-sky-narrowband-filter-astronomy-plus_d565c223-48cc-4957-a915-c00c022e7935.jpg?v=1690488387"},{"product_id":"antlia-alp-t-dual-band-5nm-highspeed-filter-2-00-mounted","title":"Antlia ALP-T Dual Band Ha+OIII 5nm Highspeed Filter","description":"\u003ch2\u003eAntlia ALP-T Dual Band Ha+OIII 5nm Highspeed Filter\u003c\/h2\u003e\n\u003cp\u003eALP-T Dual Band 5nm Highspeed Filters are further optimized to work with high-speed imaging systems by shifting slightly the passband and center wavelength. Using these highspeed filters between optics f\/2.2 and f\/3.6 shows much stronger and more contrasted in nebulae imaging compared to the standard version.\u003c\/p\u003e\n\u003cp\u003eFor optics f-ratios slower than f\/3.6, the standard ALP-T Dual Band 5nm filter is highly recommended. Meanwhile, if you seek the best possible performance with any optics faster than f\/2.2, the highspeed version is the best choice.\u003c\/p\u003e\n\u003cp\u003eBut keep in mind, the blue shift data by the computer simulation indicates narrowband filter shifts its bandwidth to shorter wavelengths with faster optics than f\/2, transmission at the emission wavelength may decrease perhaps 15%-20%. Although the Antlia ALP-T highspeed filter has similar transmission rates reduction in the H-a and OIII when the filter is used on fast optics, based on current standard version users’ data, it is evident that the filter still has the high performance of increase in emission nebula contrast and minimized halo.\u003c\/p\u003e\n\u003cp\u003eThe highspeed version price is the same as the standard filters and double benefits for the high-speed optics users. Worth mentioning is that Antlia inspected and measured products piece by piece with one of Agilent Cary’s professional spectrophotometer, resolution\/slit width is up to 0.2nm, which make us provide highly reliable and consistent products to you.\u003c\/p\u003e\n\u003cp\u003eThe Antlia ALP-T dual band 5nm series filter is a dual line-pass filter that was designed to be used primarily with one-shot color (OSC) cameras such as DSLR’s and astronomical OSC cameras. It can also be used as a narrowband filter for monochrome cameras to save imaging time. The advanced multi-coatings on our ALP-T ultra dual band filter effectively isolate the red Ha and the blue-green OIII lines light from emission nebulae, with almost total suppression of optical density (OD)4.5 on unwanted wavelengths from light pollution, moonlight, and airglow. The result is that our ALP-T dual band 5nm filter creates a superior signal-to-noise ratio and better contrast in your images.\u003c\/p\u003e\n\u003cp\u003eThe filter enables the capture of the two main emission nebulae bands at the same time, whilst suppressing unwanted light pollution. It enables you to capture cleaner data and reduces the post-processing efforts to isolate faint details from the background light pollution.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eApplication and Performance:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eDesigned especially for fast astronomy optics, in particular f-ratios f\/2.2 to f\/3.6\u003c\/p\u003e\n\u003cp\u003eEngineered specifically for use with DSLR, CMOS, and CCD color cameras\u003c\/p\u003e\n\u003cp\u003eSuppression of optical density (OD)4.5 on unwanted wavelengths adds signal-to-noise\u003c\/p\u003e\n\u003cp\u003eExtremely steep bandpass edges minimize internal reflections\u003c\/p\u003e\n\u003cp\u003eIdeal flat-top and moderate bandpass reducing spectrum down shifts\u003c\/p\u003e\n\u003cp\u003eIon Gun Assisted Deposition coating technology on the double-sided polished substrate making it the most consistent and accurate light pollution suppression filter\u003c\/p\u003e\n\u003cp\u003eDesigned to suppress artificial lighting from Bortle scale 1 to Bortle scale 8\u003c\/p\u003e\n\u003cp\u003eNear IR (NIR) is blocked up to 1050nm\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNot Recommended:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSolar imaging\u003c\/p\u003e\n\u003cp\u003eNight visual observation\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNot Permitted:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eDO NOT LOOK AT THE SUN WITH THIS FILTER\u003c\/p\u003e\n\u003cp\u003eSerious eye damage will result if you fail to observe the warning\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable border=\"1\" width=\"585px\" align=\"LEFT\" data-mce-fragment=\"1\"\u003e\n\u003ctbody data-mce-fragment=\"1\"\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd valign=\"top\" width=\"22.6%\" data-mce-fragment=\"1\"\u003e\u003c\/td\u003e\n\u003ctd valign=\"top\" width=\"25.3%\" data-mce-fragment=\"1\"\u003eHydrogen-alpha\u003c\/td\u003e\n\u003ctd valign=\"top\" width=\"24.7%\" data-mce-fragment=\"1\"\u003eOxygen III\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd valign=\"top\" width=\"22.6%\" data-mce-fragment=\"1\"\u003eFWHM\u003c\/td\u003e\n\u003ctd valign=\"top\" width=\"25.3%\" data-mce-fragment=\"1\"\u003e5nm\u003c\/td\u003e\n\u003ctd valign=\"top\" width=\"24.7%\" data-mce-fragment=\"1\"\u003e5nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd valign=\"top\" width=\"22.6%\" data-mce-fragment=\"1\"\u003eCWL (Central Wavelength)\u003c\/td\u003e\n\u003ctd valign=\"top\" width=\"25.3%\" data-mce-fragment=\"1\"\u003e657.8nm\u003c\/td\u003e\n\u003ctd valign=\"top\" width=\"24.7%\" data-mce-fragment=\"1\"\u003e502.2nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd valign=\"top\" width=\"22.6%\" data-mce-fragment=\"1\"\u003ePeak Transmission\u003c\/td\u003e\n\u003ctd valign=\"top\" width=\"25.3%\" data-mce-fragment=\"1\"\u003e88%\u003c\/td\u003e\n\u003ctd valign=\"top\" width=\"24.7%\" data-mce-fragment=\"1\"\u003e82%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd valign=\"top\" width=\"22.6%\" data-mce-fragment=\"1\"\u003eBlocking\u003c\/td\u003e\n\u003ctd colspan=\"2\" rowspan=\"1\" valign=\"top\" data-mce-fragment=\"1\"\u003e≥OD4.5 @ 300-1050nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd valign=\"top\" width=\"22.6%\" data-mce-fragment=\"1\"\u003eFilter Thickness\u003c\/td\u003e\n\u003ctd colspan=\"2\" valign=\"top\" data-mce-fragment=\"1\"\u003e2mm+\/-0.05mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp data-mce-fragment=\"1\"\u003e  \u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eFilter Ring:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e2” (M48*0.75)\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eUltra-thin filter cell to minimize vignetting by maximize possible clear aperture\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eBlack Anodized Finish\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eLaser Engraving No Fading\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eSpectrum Curve:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cdiv style=\"text-align: center;\"\u003e\u003cimg style=\"float: none;\" alt=\"ALP-T Duanl Band 5nm Highspeed Filtes Spectrum Curve.jpg\" src=\"http:\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAgjqickgYov6i9hwIwwgk4lgw.jpg\" width=\"650\" height=\"832\"\u003e\u003c\/div\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eIn the Box\u003c\/h3\u003e\n\u003cp\u003eALP-T Highspeed Filter\u003cbr\u003e\u003c\/p\u003e\n\u003cdiv class=\"value\" data-mce-fragment=\"1\"\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eWarranty \u0026amp; Manuals\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cp\u003eAntlia 3-Years Warranty Against Delamination\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"2\" Mounted","offer_id":43780787044581,"sku":"AF-ALP-T-HS-2","price":539.0,"currency_code":"CAD","in_stock":true},{"title":"36mm Unmounted","offer_id":43780787077349,"sku":"AF-ALP-T-HS-36","price":423.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/antlia-alp-t-dual-band-5nm-highspeed-filter-astronomy-plus-1.webp?v=1690488398"},{"product_id":"antlia-alp-t-dual-band-5nm-filter","title":"Antlia ALP-T Dual Band 5nm Ha \u0026 OIII \"Gold\" Filter","description":"\u003ch2 data-mce-fragment=\"1\"\u003eAntlia ALP-T Dual Band 5nm Ha\u0026amp;OIII Filter\u003c\/h2\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003e***** Antlia FAMOUS filter known as Gold Filter! *****\u003c\/strong\u003e\u003c\/em\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eThe Antlia ALP-T dual band 5nm filter is a dual line-pass filter which was designed to be used primarily with one-shot color (OSC) cameras such as DSLR’s or astronomical OSC cameras. It can also be used as a narrowband filter for monochrome cameras to save imaging time. The advanced multi-coatings on our ALP-T ultra dual band filter effectively isolates the red Ha and the blue-green OIII lines light from emission nebulae, with almost total suppression of optical density (OD)4.5 on unwanted wavelengths from light pollution, moonlight, and airglow. The result is that our ALP-T dual band 5nm filter creates a superior signal-to-noise ratio and better contrast in your images.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eThe filter enables the capture of the two main emission nebulae bands at the same time, whilst suppressing unwanted light pollution. It enables you to capture cleaner data and reduces the post processing efforts to isolate faint details from the background light pollution.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eApplication and Performance:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eEngineered specifically for use with DSLR, CMOS, and CCD color cameras\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eSuppression of optical density (OD)4.5 on unwanted wavelengths adds signal-to-noise\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eExtremely steep bandpass edges minimize internal reflections\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eIdeal flat-top and moderate bandpass reducing spectrum down shifts\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eIon Gun Assisted Deposition coating technology on the double-sided polished substrate making it the most consistent and accurate light pollution suppression filter\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eDesigned to suppress artificial lighting from Bortle scale 1 to Bortle scale 8\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eNear IR (NIR) is blocked up to 1100nm\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eNot Recommended:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eSolar imaging\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eNight visual observation\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eNot Permitted:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eDO NOT LOOK AT THE SUN WITH THIS FILTER\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eSerious eye damage will result if you fail to observe the warning\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eAdditional independent tests and reviews are available here, please credit the photographer’s names if you use their images on your website.\u003c\/p\u003e\n\u003cdiv style=\"text-align: center;\" data-mce-fragment=\"1\" data-mce-style=\"text-align: center;\"\u003e\u003cimg height=\"381\" width=\"579\" src=\"http:\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAgvJCijQYo_JyH3AQw3As43Qc.jpg\" alt=\"IC434_ALP_T+.jpg\" style=\"float: none;\" data-mce-fragment=\"1\" data-mce-style=\"float: none;\" data-mce-src=\"http:\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAgvJCijQYo_JyH3AQw3As43Qc.jpg\"\u003e\u003c\/div\u003e\n\u003cp data-mce-fragment=\"1\"\u003eTarget: IC434 – Horse Head and Flame Nebulae\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e– Telescope: Skywatcher 130mm F5 w\/MPCC\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e– Mount: Losmandy G11\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e– Camera : IMX571 26000KPA\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e– Filter: Antlia ALP-T Dual Band 5nm Filter 2”\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e– Exposure info: 300s X 24\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e– Bortle scale 5\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eCopyright: Hyunsu Lee (South Korea)\u003c\/p\u003e\n\u003cdiv style=\"text-align: center;\" data-mce-fragment=\"1\" data-mce-style=\"text-align: center;\"\u003e\u003cimg height=\"352\" width=\"527\" src=\"http:\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAg1JKijQYogYbvvQIw3As46gc.jpg\" alt=\"NGC2244_LIGHT_3+.jpg\" style=\"float: none;\" data-mce-fragment=\"1\" data-mce-style=\"float: none;\" data-mce-src=\"http:\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAg1JKijQYogYbvvQIw3As46gc.jpg\"\u003e\u003c\/div\u003e\n\u003cp data-mce-fragment=\"1\"\u003eTarget: NGC2244 – Rosette Nebula\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e– Telescope: Skywatcher 130mm F5 w\/MPCC\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e– Mount: Losmandy G11\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e– Camera: IMX571 26000KPA\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e– Filter: Antlia ALP-T Dual Band 5nm Filter 2”\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e– Exposure info: 300s X 30\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e– Bortle scale 5\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eCopyright: Hyunsu Lee (South Korea)\u003c\/p\u003e\n\u003cdiv style=\"text-align: center;\" data-mce-fragment=\"1\" data-mce-style=\"text-align: center;\"\u003e\u003cimg height=\"348\" width=\"522\" src=\"http:\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAg85eijQYopMPmxwYw3As46gc.jpg\" alt=\"NGC 6960_Western Veil nebula+.jpg\" style=\"float: none;\" data-mce-fragment=\"1\" data-mce-style=\"float: none;\" data-mce-src=\"http:\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAg85eijQYopMPmxwYw3As46gc.jpg\"\u003e\u003c\/div\u003e\n\u003cp data-mce-fragment=\"1\"\u003eTarget: Western Veil nebula\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e– Telescope: Skywatcher 130mm F5 w\/MPCC\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e– Mount: Losmandy G11\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e– Camera: IMX571 26000KPA\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e– Filter: Antlia ALP-T Dual Band 5nm Filter 2”\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e– Exposure info: 300s X 7\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e– Bortle scale 5\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eCopyright: Hyunsu Lee (South Korea)\u003c\/p\u003e\n\u003cdiv style=\"text-align: center;\" data-mce-fragment=\"1\" data-mce-style=\"text-align: center;\"\u003e\u003cimg height=\"327\" width=\"513\" src=\"http:\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAg-5qijQYo-b6ohwIw3As4vQc.jpg\" alt=\"IC63_LIGHT+.jpg\" style=\"float: none;\" data-mce-fragment=\"1\" data-mce-style=\"float: none;\" data-mce-src=\"http:\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAg-5qijQYo-b6ohwIw3As4vQc.jpg\"\u003e\u003c\/div\u003e\n\u003cp data-mce-fragment=\"1\"\u003eTarget: IC63 – The Phantom of Cassiopeia\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e– Telescope: Skywatcher 130mm F5 w\/MPCC\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e– Mount: Losmandy G11\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e– Camera : IMX571 26000KPA\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e– Filter: Antlia ALP-T Dual Band 5nm Filter 2″\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e– Exposure info: 300s X 32\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e– Bortle scale 5\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eCopyright: Hyunsu Lee (South Korea)\u003c\/p\u003e\n\u003cdiv style=\"text-align: center;\" data-mce-fragment=\"1\" data-mce-style=\"text-align: center;\"\u003e\u003cimg height=\"354\" width=\"529\" src=\"http:\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAgwp6ijQYo1KLR4QEw3As46gc.jpg\" alt=\"betelgeuse+.jpg\" style=\"float: none;\" data-mce-fragment=\"1\" data-mce-style=\"float: none;\" data-mce-src=\"http:\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAgwp6ijQYo1KLR4QEw3As46gc.jpg\"\u003e\u003c\/div\u003e\n\u003cp data-mce-fragment=\"1\"\u003eTarget: Betelgeuse(Magnitude：0.5)\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e– Telescope: Skywatcher 130mm F5 w\/MPCC\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e– Mount: Losmandy G11\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e– Camera: IMX571 26000KPA\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e– Filter: Antlia ALP-T Dual Band 5nm Filter 2”\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eCopyright: Hyunsu Lee (South Korea) \u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable align=\"LEFT\" border=\"1\" width=\"585px\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd valign=\"top\" width=\"22.6%\"\u003e\u003c\/td\u003e\n\u003ctd valign=\"top\" width=\"25.3%\"\u003eHydrogen-alpha\u003c\/td\u003e\n\u003ctd valign=\"top\" width=\"24.7%\"\u003eOxygen III\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd valign=\"top\" width=\"22.6%\"\u003eFWHM\u003c\/td\u003e\n\u003ctd valign=\"top\" width=\"25.3%\"\u003e5nm\u003c\/td\u003e\n\u003ctd valign=\"top\" width=\"24.7%\"\u003e5nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd valign=\"top\" width=\"22.6%\"\u003eCWL (Central Wavelength)\u003c\/td\u003e\n\u003ctd valign=\"top\" width=\"25.3%\"\u003e656.3nm\u003c\/td\u003e\n\u003ctd valign=\"top\" width=\"24.7%\"\u003e500.7nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd valign=\"top\" width=\"22.6%\"\u003ePeak Transmission\u003c\/td\u003e\n\u003ctd valign=\"top\" width=\"25.3%\"\u003e90%\u003c\/td\u003e\n\u003ctd valign=\"top\" width=\"24.7%\"\u003e82%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd valign=\"top\" width=\"22.6%\"\u003eBlocking\u003c\/td\u003e\n\u003ctd valign=\"top\" rowspan=\"1\" colspan=\"2\"\u003e≥OD4.5 @ 300-1100nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd valign=\"top\" width=\"22.6%\"\u003eFilter Thickness\u003c\/td\u003e\n\u003ctd valign=\"top\" colspan=\"2\"\u003e2mm+\/-0.05mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFilter Ring:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e2” (M48*0.75)\u003c\/p\u003e\n\u003cp\u003eUltra-thin filter cell to minimize vignetting by maximize possible clear aperture\u003c\/p\u003e\n\u003cp\u003eBlack Anodized Finish\u003c\/p\u003e\n\u003cp\u003eLaser Engraving No Fading\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSpectrum Curve:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cimg height=\"368\" width=\"580\" data-ll-status=\"loaded\" alt=\"Antlia ALP-T Dualband 5nm spectrum curve.jpg\" src=\"http:\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAg34KijQYowJrAHzDFCTiGBg.jpg\" class=\"need_fix lazyloaded\" data-mce-src=\"http:\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAg34KijQYowJrAHzDFCTiGBg.jpg\"\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eIn the Box\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003eALP-T Filter\u003cbr\u003e\u003c\/p\u003e\n\u003cdiv class=\"value\" data-mce-fragment=\"1\"\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eWarranty \u0026amp; Manuals\u003c\/h3\u003e\n\u003cp\u003eAntlia \u003cspan data-mce-fragment=\"1\"\u003e3-Years Against Delamination\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Antlia","offers":[{"title":"2\" Mounted","offer_id":43780770103525,"sku":"AF-ALP-T-2-HaOIII","price":539.0,"currency_code":"CAD","in_stock":true},{"title":"36mm Unmounted","offer_id":43780770136293,"sku":"AF-ALP-T-36-HaOIII","price":423.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/antlia-alp-t-dual-band-5nm-haandoiii-gold-filter-astronomy-plus-1.webp?v=1690488412"},{"product_id":"antlia-h-beta-and-oiii-filter-1-25","title":"Antlia H-beta and OIII Filter 1.25″","description":"\u003ch2 data-mce-fragment=\"1\"\u003eAntlia H-beta and OIII Filter – 1.25″\u003c\/h2\u003e\n\u003cp data-mce-fragment=\"1\"\u003eAntlia HB-OIII filter is engineered specifically for night visual nebulae observation at a high contrast and Deep-sky astrophotography. Its transmission is 90% or greater at critical wavelengths (OIII 500.7nm, OIII 495.9nm, and H-Beta 486.1nm). You’ll notice much higher contrast boost to observe Planetary Nebula, Supernova Remnant, Emission Nebula, Diffuse Nebula, and extremely faint nebulae by Antlia HB-OIII filter.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eWhen it is used for Astro Deep-sky imaging, it enhances the details of the OIII and H-Beta emission lines with astronomical cameras and DSLRs.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eMain Application and Performance:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eAntlia HB-OIII filter was coated with almost total suppression of optical density (OD)4 on unwanted wavelength and the filter cut-off wavelength is 300-1000nm, which meets the spectral requirements of photographic cameras and further enhances the suppression of the IR region, compared with the visual filters with a cut-off depth of OD3@350-750nm, it performs better to darken the sky background and make deep-sky observation and photography of nebulae, star clusters, and galaxies more easily.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eThe HB-OIII filter helps faint objects become much more visible against the blackened background and produces near-photographic views of the Veil, Dumbbell, and Orion nebula, among many other objects under both light-polluted and dark skies.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eSince human eyes are less sensitive at night, large aperture telescopes are recommended to gather light and funnel it into the observer’s eyes.\u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable cellspacing=\"0\" border=\"1\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd width=\"185\" valign=\"top\"\u003e\u003c\/td\u003e\n\u003ctd width=\"174\" valign=\"top\"\u003eOxygen III\u003c\/td\u003e\n\u003ctd width=\"168\" valign=\"top\"\u003eOxygen III\u003c\/td\u003e\n\u003ctd width=\"168\" valign=\"top\"\u003eH-Beta\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"185\" valign=\"top\"\u003eCWL (Central Wavelength)\u003c\/td\u003e\n\u003ctd width=\"174\" valign=\"top\"\u003e500.7nm\u003c\/td\u003e\n\u003ctd width=\"168\" valign=\"top\"\u003e495.9nm\u003c\/td\u003e\n\u003ctd width=\"168\" valign=\"top\"\u003e486.1nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"185\" valign=\"top\"\u003ePeak Transmission\u003c\/td\u003e\n\u003ctd width=\"174\" valign=\"top\"\u003e＞90%\u003c\/td\u003e\n\u003ctd width=\"168\" valign=\"top\"\u003e＞90%\u003c\/td\u003e\n\u003ctd width=\"168\" valign=\"top\"\u003e＞90%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"185\" valign=\"top\"\u003eBlocking\u003c\/td\u003e\n\u003ctd width=\"509\" valign=\"top\" colspan=\"3\"\u003eOD4@ 300-1000nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"185\" valign=\"top\"\u003eFilter Thickness\u003c\/td\u003e\n\u003ctd width=\"509\" valign=\"top\" colspan=\"3\"\u003e2mm+\/-0.05mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"185\" valign=\"top\"\u003eBasic Substrate\u003c\/td\u003e\n\u003ctd width=\"509\" valign=\"top\" colspan=\"3\"\u003eOptical, Single, Non-glued substrate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"185\" valign=\"top\"\u003eSurface Quality\u003c\/td\u003e\n\u003ctd width=\"509\" valign=\"top\" colspan=\"3\"\u003eS\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"185\" valign=\"top\"\u003eTransmitted Wavefront\u003c\/td\u003e\n\u003ctd width=\"509\" valign=\"top\" colspan=\"3\"\u003eLambda\/4 or better\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"185\" valign=\"top\"\u003eParallelism\u003c\/td\u003e\n\u003ctd width=\"509\" valign=\"top\" colspan=\"3\"\u003eless than 30 arcsec\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eIn the Box\u003c\/h3\u003e\n\u003cp\u003eFilter\u003cbr\u003e\u003c\/p\u003e\n\u003cdiv class=\"value\" data-mce-fragment=\"1\"\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eWarranty \u0026amp; Manuals\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003eAntlia 3-Years Warranty Against Delamination\u003cbr\u003e\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":43628340019429,"sku":"AF-HB-OIII125","price":140.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/antlia-h-beta-and-oiii-filter-1-25-astronomy-plus-1.webp?v=1690488414"},{"product_id":"optolong-l-ultimate-dual-band-3nm-filter-2-l-ultimate","title":"Optolong L-Ultimate Dual-Band 3nm Filter","description":"\u003ch1\u003eOptolong L-Ultimate Filter\u003c\/h1\u003e\n\u003cp\u003eIt’s about a 3nm dual band designed to drastically reduce the effect of light pollution, the 3nm isolates the nebulae’s emissions into H-Alpha (red) and OIII (green-blue). It blocks light pollution, maximizes the signal from nebulae, and darkens the sky background. It also blocks artificial light from mercury vapor lamps, high and low pressure sodium vapor lights, and unwanted natural light caused by the emission of neutral oxygen in our atmosphere. …\u003c\/p\u003e\n\u003ch4\u003e\u003cstrong\u003eOpotlong L-Ultimate Introduction\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cp\u003eIt’s about a 3nm dual band designed to drastically reduce the effect of light pollution, the 3nm isolates the nebulae’s emissions into H-Alpha (red) and OIII (green-blue). It blocks light pollution, maximizes the signal from nebulae, and darkens the sky background. It also blocks artificial light from mercury vapor lamps, high and low pressure sodium vapor lights, and unwanted natural light caused by the emission of neutral oxygen in our atmosphere. Maximizes the transmission of the main emission lines of the nebula in OIII (496nm and 500nm) and H-alpha (656nm). Used with DSLR, color\/MONO CMOS and CCD, however, this filter is not suitable for fast ratio systems.\u003c\/p\u003e\n\u003cp\u003eThe advantage of L-Ultimate is that it only passes through the emission lines OIII(500.7nm) and Ha(656.3nm), in which case all other light pollution emission lines are eliminated so that only the emission and reflection signals of the nebula are captured during imaging. Therefore, the sky background of the image is darker, and the contrast between the nebulae and the signal-to-noise ratio are improved to the greatest extent. In heavy light pollution areas, the product can also selectively filter light pollution and clutter signals through the emission lines of nebulae, and finally avoid the impact of light pollution on astrophotography.\u003c\/p\u003e\n\u003cp\u003eIt is different from the series of dual-narrowband L-eNhance and L-eXtreme in that L-Ultimate is a dual-3nm bandwidth filter that only passes through Ha and OIII emission lines. You will get a darker sky background, more contrast of the image and the suppression on stars. L-Ultimate has also been optimized in terms of halo performance, so that there is no obvious halo when shooting on a bright star object.\u003c\/p\u003e\n\u003ch4\u003eFeatures\u003c\/h4\u003e\n\u003ctable align=\"center\" cellpadding=\"1\" cellspacing=\"2\" border=\"1\" class=\"alignleft\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSbustrate\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eoptical glass\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFWHM\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eOIII 3nm Ha 3nm\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBlocking range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e300-1000nm\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBlocking\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e\u0026gt;OD4\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSurface quality\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e60\/40\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTransmitted Wavefront RMS:\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eλ\/4\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eParallelism\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e30seconds\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch4\u003e\u003cstrong\u003eL-Ultimate Filter Performance\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cp\u003e\u003cu\u003e\u003cstrong\u003eNebulae Flying Bat and Squid in the constellation of Cepheus.\u003c\/strong\u003e\u003c\/u\u003e\u003cbr\u003eSquid (OU4) is a region characterized by very weak OIII emission with a bipolar shape reminiscent of planetary nebulae. Recent studies suggest that Ou4 is actually internal to SH2-129 (the H-alpha-emitting flying bat nebula, reddish in the image), generated by a triple star system located in the center (HR8119, visible as the bright star in the center of Squid).\u003cbr\u003eThe distance from our solar system is estimated at about 1300 light years.\u003cbr\u003eThe lights were taken over 2 years, with total integration equal to 29 hours (21.5 for OU4 and 7.5 for SH2-129).\u003cbr\u003eThis project gave me the opportunity to test the Omegon veTEC 571C camera and the Optolong L-Ultimate filter with excellent results for both products.\u003c\/p\u003e\n\u003cp\u003eLights: 258x300s (Ou4, L-Extreme) + 30x900s (Sh2-129, L-Ultimate)\u003c\/p\u003e\n\u003cp\u003eTelescope1: Apocromatic TS PhotoLine 102 f\/5,6 Triplet FPL53\u003cbr\u003eTelescope2: Takahashi FS60CB @ f\/4.2\u003cbr\u003eCamera1: ZWO ASI 294mc Pro\u003cbr\u003eCamera2: Omegon veTEC 571C\u003cbr\u003eMount: Skywatcher AZ-EQ6 GT\u003cbr\u003eFilters: Optolong Astronomy Filter L-Extreme + L-Ultimate\u003cbr\u003eProcessing: DeepSkyStacker, Photoshop CC, PixInsight\u003cbr\u003eCredit:Tommaso Massimo Stella (Italy)\u003c\/p\u003e\n\u003cp\u003e\u003cimg class=\"lazyloaded\" src=\"https:\/\/optolong.com\/uploads\/images\/20220813\/8e82dcbd4356c2b25658ae4d38898da9.jpg\" alt=\"\" width=\"529\" height=\"361\" data-ll-status=\"loaded\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cu\u003e\u003cstrong\u003eObjects: Veil Nebula\u003c\/strong\u003e\u003c\/u\u003e\u003cbr\u003eCamera: QHY168C\u003cbr\u003eTelescope: Pentax 100 SDUF II F\/4\u003cbr\u003eMount: Skywatcher AZ-EQ5GT\u003cbr\u003eFilter: Optolong 3nm L-Ultimate Filter\u003cbr\u003eFrames: 13 x 240sec lights\u003cbr\u003eCredit:Tommy Lim KW (Malaysia)\u003c\/p\u003e\n\u003cp\u003e\u003cimg class=\"lazyloaded\" src=\"https:\/\/optolong.com\/uploads\/images\/20220813\/0a012c0ef16bddfb90595bf2502e3c51.jpg\" alt=\"\" width=\"531\" height=\"353\" data-ll-status=\"loaded\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cu\u003e\u003cstrong\u003eSh2-132 The Lion nebula\u003c\/strong\u003e\u003c\/u\u003e\u003cbr\u003eProsegue il test del filtro  Ultimate della Optolong Astronomy Filter\u003cbr\u003e96 light da 300 sec\u003cbr\u003eNo dark no flat\u003cbr\u003eCredit:Andrea Maggi\u003c\/p\u003e\n\u003cp\u003e\u003cimg class=\"lazyloaded\" src=\"https:\/\/optolong.com\/uploads\/images\/20220813\/31ceb16a19983c46396af72fe7ba3cc1.jpg\" alt=\"\" width=\"500\" height=\"335\" data-ll-status=\"loaded\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cu\u003e\u003cstrong\u003eSupernova remnant W63\u003c\/strong\u003e\u003c\/u\u003e\u003c\/p\u003e\n\u003cp\u003eSupernova remnant W63 glows like a faint cosmic smoke ring along the plane of the Milky Way toward the northern constellation Cygnus. Its spectral appearance is reflected in the region’s rich complex of interstellar clouds and dust by an eerie blue glow, captured with Optolong’s new dual band 3nn filter!! L-Ultimate…\u003c\/p\u003e\n\u003cp\u003eCanon Eos MK IV mod by CentralDS 20×900″ ISO3200\u003cbr\u003eOptolong L-Ultimate\u003cbr\u003eSkywatcher AZ-GTI mount\u003cbr\u003eGuide camera ZWO ASI 120MM\u003cbr\u003eCredit:José Jiménez (Spain)\u003c\/p\u003e\n\u003cp\u003e\u003cimg class=\"lazyloaded\" src=\"https:\/\/optolong.com\/uploads\/images\/20220813\/4672efc207e69c658cf26c68e7bea6a4.jpg\" alt=\"\" width=\"504\" height=\"338\" data-ll-status=\"loaded\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cu\u003e\u003cstrong\u003eSharpless 129\u003c\/strong\u003e\u003c\/u\u003e\u003cbr\u003eCanon Eos MK IV mod by CentralDS 30×900″ ISO3200\u003cbr\u003eOptolong L-Ultimate\u003cbr\u003eCredit:José Jiménez (Spain)\u003c\/p\u003e\n\u003cp\u003e\u003cimg class=\"lazyloaded\" src=\"https:\/\/optolong.com\/uploads\/images\/20220813\/f94ddb185f8fe14b6659bda59bfa14f0.jpg\" alt=\"\" width=\"515\" height=\"338\" data-ll-status=\"loaded\"\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cu\u003e\u003cstrong\u003eNGC6888 HOO Version\u003c\/strong\u003e\u003c\/u\u003e\u003cbr\u003eTelescope ASKAR 500\u003cbr\u003eCamera Zwo ASI 6200\u003cbr\u003eFilter Optolong 3nm\u003cbr\u003eSoftware Voyager\u003cbr\u003eCredit:Andrea Maggi (Italy)\u003c\/p\u003e\n\u003cp\u003e\u003cimg class=\"lazyloading\" src=\"https:\/\/optolong.com\/uploads\/images\/20220813\/1d8c80c3e194a0161f9b4569df88ff1f.jpg\" alt=\"\" width=\"486\" height=\"324\" data-lazy-src=\"https:\/\/optolong.com\/uploads\/images\/20220813\/1d8c80c3e194a0161f9b4569df88ff1f.jpg\" data-ll-status=\"loading\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cu\u003e\u003cstrong\u003eNGC7635 \u0026amp; Sh2-157\u003c\/strong\u003e\u003c\/u\u003e\u003cbr\u003eDue ore stanotte da Saint Barthelemy\u003cbr\u003eTelescopio Askar 80 PH\u003cbr\u003eCamera Asi 2600\u003cbr\u003eFiltro Optolong Ultimate\u003cbr\u003eCredit:Andrea Maggi (Italy)\u003c\/p\u003e\n\u003cp\u003e\u003cimg class=\"lazyloading\" src=\"https:\/\/optolong.com\/uploads\/images\/20220813\/a637b149e53e64b7d6e98dbf75f1c346.jpg\" alt=\"\" width=\"504\" height=\"337\" data-lazy-src=\"https:\/\/optolong.com\/uploads\/images\/20220813\/a637b149e53e64b7d6e98dbf75f1c346.jpg\" data-ll-status=\"loading\"\u003e\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cem\u003eReference Spectrum\u003c\/em\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg data-ll-status=\"loaded\" height=\"279\" width=\"569\" alt=\"\" src=\"https:\/\/optolong.com\/uploads\/images\/20220813\/affa162a0200e85a43f613d6409654fc.png\" class=\"lazyloaded\"\u003e\u003c\/p\u003e\n\u003cp\u003e※This curve is only for reference, and is not used as the final product data.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow to read the chart?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e▲The horizontal axis is the Wavelength in Nanometers(nm).\u003c\/p\u003e\n\u003cp\u003e▲The vertical axis is transmission in %.\u003cimg data-ll-status=\"loaded\" height=\"80\" width=\"486\" alt=\"\" src=\"http:\/\/www.optolong.com\/uploads\/images\/20191111\/0ff2d7f395c427aa390ff53daf333cec.jpg\" class=\"aligncenter lazyloaded\"\u003e\u003c\/p\u003e\n\u003ctable class=\"alignleft\" border=\"1\" cellspacing=\"2\" cellpadding=\"1\" align=\"center\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSbustrate\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eoptical glass\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFWHM\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eOIII 3nm Ha 3nm\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBlocking range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e300-1000nm\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBlocking\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e\u0026gt;OD4\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSurface quality\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e60\/40\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTransmitted Wavefront RMS:\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eλ\/4\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eParallelism\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e30seconds\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003eCoating Technology\u003c\/strong\u003e\u003c\/em\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e·Multi-layers anti-reflection coating\u003c\/p\u003e\n\u003cp\u003e·Non-cementing optical substrate coating\u003c\/p\u003e\n\u003cp\u003e·Optolong filter adopts precision coating based on Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL(central wavelength) no deviation affected by temperature change.\u003c\/p\u003e\n\u003cp\u003e·Planetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and Optical density of off-band.\u003c\/p\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cp\u003eFilter\u003c\/p\u003e\n\u003ch3\u003eManuals \u0026amp; Warranty\u003cbr\u003e\n\u003c\/h3\u003e\n\u003cp\u003eOptolong 3-Years Warranty\u003c\/p\u003e","brand":"Optolong","offers":[{"title":"1.25\"","offer_id":44430953251045,"sku":"OL-L-ULTIMATE-125","price":403.0,"currency_code":"CAD","in_stock":true},{"title":"2\"","offer_id":44430953283813,"sku":"OL-L-ULTIMATE-2","price":543.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/optolong-l-ultimate-dual-band-3nm-filter-2-l-ultimate-astronomy-plus-1.webp?v=1690488488"},{"product_id":"askar-color-magic-6nm-deep-sky-narrowband-filter","title":"Askar Colour Magic D1 \u0026 D2 6nm Deep-Sky Narrowband Filters","description":"\u003ch1 data-mce-fragment=\"1\"\u003e\u003cspan\u003eAskar Colour Magic D 6nm Deep-Sky Narrowband Filters\u003c\/span\u003e\u003c\/h1\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eFor all astrophotography enthusiasts, filters are one of the indispensable accessories to achieve perfect deep-sky imaging. The dedicated astronomy filters for deep-sky imaging can effectively eliminate the influence from the background light and enhance the contract of your photographs and make the targets displayed more clearly and delicately. Askar’ s new-launched 6nm deep-sky Duo-narrowband Filter set colour Magic is a professional astrophotography tool specifically designed for deep-sky imaging.\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eThis 6nm filter set has a narrow bandwidth. Therefore, even if your are at an area affected by the urban light pollution, night glow and other undesired light, you can capture high-quality deep-sky pictures with the help of Askar 6nm Duo-narrowband Filters. The narrower bandwidth and efficient light transmission considerably enhance the contrast of your pictures, making it easier to display the details of the stars that otherwise are fairly difficult to spot.\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eAt the same time, the Colour Magic 6nm deep-sky Duo-narrowband Filter has very good halation control, providing more contribution to your astrophotography.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e \u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan\u003eAfter the 2\" 6nm duo-narrowband filter (Hα+OIII), Askar ColourMagic Specially launches the SII+OIII 2\" 6nm duo-narrowband filter, which is further convenient for astronomy enthusiasts while maintaining quality. When shooting with the 2\" 6nm duo-narrowband filter (Hα+OIII) and a color camera, users will have remarkable results.\u003cbr\u003e\u003cbr\u003eUsually in astrophotography, the Hα signal-to-noise ratio is stronger while the OIII is relatively weak. As our two duo-narrowband filters are Hα+OIII and SII+OIII, the combination can balance the signal-to-noise ratio of each channel when shooting, and after software processing, it can achieve the ideal result almost as well as shooting with a combination of three narrowband filters and mono camera.\u003cbr\u003e\u003cbr\u003eWe name the  Hα+OIII 2\" 6nm duo-narrowband filter “D1” and the SII+OIII filter “D2”, the combination of them is Askar's latest \"D\" filter set. It offers a new way for color camera users to get similar results without using a mono camera and the SHO filters.\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan\u003e\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003eThe Askar D filter set offers a new option for astronomy enthusiasts and is sure to please.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 data-mce-fragment=\"1\"\u003e\u003cspan\u003e\u003cstrong data-mce-fragment=\"1\"\u003eD2 Colour Magic 6nm Duo-narrowband Filter (OIII + SII)\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003cspan data-mce-fragment=\"1\"\u003eWhile most of the commercially available duo-narrowband filters for deep-sky astrophotography are in the Ha and OIII bands, ASKAR offers another structure: SII \u0026amp; OIII.\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eWhen shooting deep-sky galaxies with colour cameras, a duo-narrowband filter in the Ha and OIII bands is often used; whereas with a mono camera, a narrowband filter in the Ha, SII and OIII bands is often used, leaving users with colour cameras missing one band of nebula detail. This can be compensated by using SII and OIII duo-narrowband filters mentioned above.\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eAskar 6nm Duo-narrowband Filter (OIII \u0026amp; SII) has an ultra-high transmittance over 90% at its center wavelength (500.7nm and 671nm). Askar 6nm Duo-narrowband Filter (OIII \u0026amp; SII) can effectively eliminate the influence of light pollution. Even if you are in an area seriously affected by light pollution, the pictures taken with the Askar 6nm Duo-narrowband Filter (OIII \u0026amp; SII) are still very good. It is so practical and efficient that you can get astronomical images of high quality with just one duo-narrowband filter and an ordinary astronomical colour camera.\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eAskar 6nm Duo-narrowband Filter (OIII \u0026amp; SII) is ideal for photographing emission nebulae, planetary nebulae or supernova remnants, and has a very high transmittance at the central wavelength. The highly narrow bandwidth of the filter effectively blocks out the effects of light pollution or other distracting factors such as night glow.\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2 data-mce-fragment=\"1\"\u003e\u003cspan\u003e\u003cstrong data-mce-fragment=\"1\"\u003eD1 Colour Magic 6nm Duo-narrowband Filter (OIII + Ha)\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp style=\"font-weight: 400;\" data-mce-style=\"font-weight: 400;\"\u003e\u003cspan\u003eAskar 6nm Duo-narrowband Filter (OIII \u0026amp; Ha) has an ultra-high transmittance over 90% at its center wavelength (500.7nm and 656.3nm). Askar 6nm Duo-narrowband Filter can effectively eliminate the influence of light pollution. Even if you are in an area seriously affected by light pollution, the pictures taken with the Askar 6nm Duo-narrowband Filter are still very good. You can get astronomical images of high quality with just one duo-narrowband filter and an ordinary astronomical colour camera.\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e \u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eAskar 6nm Duo-narrowband Filter (OIII \u0026amp; Ha) is ideal for photographing emission nebulae, planetary nebulae or supernova remnants, and has a very high transmittance at the central wavelength. The highly narrow bandwidth of the filter effectively blocks out the effects of light pollution or other distracting factors such as night glow.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong\u003eAskar 6nm Duo-Band Filter (OIII + SII)\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e6nm Duo-narrowband Filter (OIII \u0026amp; SII) 2”\u003cbr\u003eFWHM: 6nm\u003cbr\u003eCWL: 500.7nm \u0026amp; 671nm\u003cbr\u003ePeak transmittance：90%\u003cbr\u003eThickness：1.85 ± 0.05mm\u003cbr\u003eBarrier property：≥OD5 @ 200-1100nm\u003cbr\u003eSurface finish：60\/40\u003cbr\u003eParallelism：30\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong\u003eAskar 6nm Duo-Band Filter (OIII + HA)\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e6nm Duo-narrowband Filter (OIII \u0026amp; Ha) 2”\u003cbr\u003eFWHM: 6nm\u003cbr\u003eCWL: 500.7nm \u0026amp; 656.3nm\u003cbr\u003ePeak transmittance：90%\u003cbr\u003eThickness：1.85 ± 0.05mm\u003cbr\u003eBarrier property：≥OD5 @ 200-1100nm\u003cbr\u003eSurface finish：60\/40\u003cbr\u003eParallelism：30”\u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eIn the Box\u003c\/h3\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003eFilter\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv data-mce-fragment=\"1\" class=\"value\"\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eWarranty \u0026amp; Manuals\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003eAskar Warranty\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Askar","offers":[{"title":"Color Magic 6nm 2\" Filters Duo Pack (D1 + D2)","offer_id":43786339221733,"sku":"ASK-CM-D1+D2","price":875.0,"currency_code":"CAD","in_stock":true},{"title":"Color Magic 6nm 2\" Filter D1 (OIII + Ha)","offer_id":43786339254501,"sku":"ASK-CM-D1","price":447.0,"currency_code":"CAD","in_stock":true},{"title":"Color Magic 6nm 2\" Filter D2 (OIII + SII)","offer_id":43786339287269,"sku":"ASK-CM-D2","price":447.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/askar-color-magic-6nm-deep-sky-narrowband-filters-astronomy-plus-1_e3f61ca7-b6dd-42a2-ac60-6c3471eacc96.jpg?v=1690488639"},{"product_id":"svbony-1-25-2-uv-ir-cut-filters-for-astronomy-accessories","title":"SVBONY 1.25''\/2'' UV IR Cut Filters for Astronomy Accessories","description":"\u003ch2\u003eSVBONY 1.25''\/2'' UV IR Cut Filters for Astronomy Accessories\u003c\/h2\u003e\n\u003cp\u003eThis UV\/IR Cut off filter blocks undesirable ultraviolet and infrared rays that may interfere with obtaining the high contrast and high quality images possible with a digital sensor.\u003cbr\u003eIt serves as a permanent lens protector;digital imaging with DSLR cameras;CCD cameras;and modified WebCams or telescope.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003eTrue optical quality glass substrate and coatings achieves greater detail;less chromatic aberration;more natural colors and finer color gradation.\u003cbr\u003eCombine with any standard 1.25” filter threads for 1.25” eyepieces and other accessories to deliver the sharpest images possible;reducing ghost images caused by IR radiation.\u003cbr\u003eComes with a plastic box to keep it safe and clean when not in use;It's a great birthday Christmas gift.\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003eThe UV IR cut filter uses the very latest coating technology to deliver the finest filtration quality, and lifetime durability. If you use DSLR camera, CCD camera, or telescope, it absolutely will be one of your best choices\u003cbr\u003e\u003cbr\u003e2. We provide you with two sizes to choose from, 1.25'' and 2''\u003cbr\u003e\u003cbr\u003e3. Color CCD cameras such as the Skyris color planetary cameras are very sensitive across the visual spectrum, as well as in infrared. Some telescopes may correct for chromatic aberration, but are not designed to correct for IR light, which can often look defocused in astroimages. Blocking infrared (IR) light provides the greatest color balance and sharpness in your astroimages. This filter blocks IR while passing more than 94% of the entire visual spectrum, maintaining color fidelity.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/1_80046cfa-d103-4496-9878-f40669f37b3e.jpg?v=1759432926\"\u003e\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable style=\"box-sizing: border-box; border-collapse: collapse; margin: 0px auto 15px; width: 1240px; border-spacing: 0px; color: #424242; font-family: Poppins, Helvetica, Tahoma, Arial, serif; font-size: 14px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: left; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: #ffffff; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;\"\u003e\n\u003ctbody style=\"box-sizing: border-box;\"\u003e\n\u003ctr style=\"box-sizing: border-box;\"\u003e\n\u003ctd style=\"box-sizing: border-box; padding: 7px 12px; text-align: center; font-size: 12px; border: 1px solid #e8e9eb;\"\u003eModel\u003c\/td\u003e\n\u003ctd style=\"box-sizing: border-box; padding: 7px 12px; text-align: center; font-size: 12px; border: 1px solid #e8e9eb;\"\u003eF9127A\u003c\/td\u003e\n\u003ctd style=\"box-sizing: border-box; padding: 7px 12px; text-align: center; font-size: 12px; border: 1px solid #e8e9eb;\"\u003eF9127B\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"box-sizing: border-box;\"\u003e\n\u003ctd style=\"box-sizing: border-box; padding: 7px 12px; text-align: center; font-size: 12px; border: 1px solid #e8e9eb;\"\u003eSize\u003c\/td\u003e\n\u003ctd style=\"box-sizing: border-box; padding: 7px 12px; text-align: center; font-size: 12px; border: 1px solid #e8e9eb;\"\u003e1.25''\u003c\/td\u003e\n\u003ctd style=\"box-sizing: border-box; padding: 7px 12px; text-align: center; font-size: 12px; border: 1px solid #e8e9eb;\"\u003e2''\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"box-sizing: border-box;\"\u003e\n\u003ctd style=\"box-sizing: border-box; padding: 7px 12px; text-align: center; font-size: 12px; border: 1px solid #e8e9eb;\"\u003eThread\u003c\/td\u003e\n\u003ctd style=\"box-sizing: border-box; padding: 7px 12px; text-align: center; font-size: 12px; border: 1px solid #e8e9eb;\"\u003eM28.5*0.6\u003c\/td\u003e\n\u003ctd style=\"box-sizing: border-box; padding: 7px 12px; text-align: center; font-size: 12px; border: 1px solid #e8e9eb;\"\u003eM48*0.75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"box-sizing: border-box;\"\u003e\n\u003ctd style=\"box-sizing: border-box; padding: 7px 12px; text-align: center; font-size: 12px; border: 1px solid #e8e9eb;\"\u003ethickness\u003c\/td\u003e\n\u003ctd style=\"box-sizing: border-box; padding: 7px 12px; text-align: center; font-size: 12px; border: 1px solid #e8e9eb;\"\u003e1.85mm\u003c\/td\u003e\n\u003ctd style=\"box-sizing: border-box; padding: 7px 12px; text-align: center; font-size: 12px; border: 1px solid #e8e9eb;\"\u003e1.85mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"box-sizing: border-box;\"\u003e\n\u003ctd style=\"box-sizing: border-box; padding: 7px 12px; text-align: center; font-size: 12px; border: 1px solid #e8e9eb;\"\u003eType\u003c\/td\u003e\n\u003ctd style=\"box-sizing: border-box; padding: 7px 12px; text-align: center; font-size: 12px; border: 1px solid #e8e9eb;\" colspan=\"2\"\u003eUV IR cut filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cp\u003eSVBONY 1.25''\/2'' UV IR Cut Filters for Astronomy Accessories\u003c\/p\u003e\n\u003ch3\u003eManuals \u0026amp; Warranty\u003c\/h3\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/istronomyplus.com\/pages\/svbony-warranty\" target=\"_blank\"\u003eSvbony 1-Year Warranty \u003c\/a\u003e\u003c\/p\u003e","brand":"Svbony","offers":[{"title":"1.25\"","offer_id":43969885143269,"sku":"SVB-F9127A","price":22.0,"currency_code":"CAD","in_stock":true},{"title":"2\"","offer_id":43969885176037,"sku":"SVB-F9127B","price":25.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/svbony-1-25-2-uv-ir-cut-filters-for-astronomy-accessories-astronomy-plus-1.webp?v=1690489343"},{"product_id":"svbony-1-25-2-eos-c-cls-light-pollution-broadband-filters","title":"SVBONY 1.25''\/2'' EOS-C CLS Light Pollution Broadband Filters","description":"\u003ch2\u003eSVBONY 1.25''\/2''\/EOS-C CLS Light Pollution Broadband Filters\u003c\/h2\u003e\n\u003cp\u003eElectron beam gun evaporation with Ion assisted deposition coating technology for durability and resistance to scratching;as well as stability on CWL (central wavelength) no deviation affected by temperature change.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003ePlanetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and Optical density of off band.\u003cbr\u003e90% transmission of main nebula emission lines;such as Ha 656nm;OIII\u003c\/p\u003e\n\u003cp\u003e496nm;500nm;SII672nm and H-beta 486nm.\u003cbr\u003e0.1% transmission of off-band;specifically the major emission lines of artificial light pollution;such as Na 589nm;Hg 435nm and 578nm.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003eSuitable for color CCD cameras and unmodified DSLR Urban optical filter can effectively suppress urban harmful light and improve the contrast of shooting target.\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003eThe SVBONY City Light Suppression broadband filter is designed to improve the visibility of various Deepsky objects. By selectively reducing the transmission of wavelengths of light pollutants, specifically those produced by artificial lightings including mercury vapor lamps, both high \u0026amp; low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow)\u003cbr\u003e\u003cbr\u003e2. Together with the highly transparent in main nebula emission lines at OIII(496nm and 500nm), H-beta (486nm), NII(654nm and 658nm), H-alpha(656nm) as well as SII(672nm), the Svbony CLS filter is suitable for enhancing the contrast and details for both visual and photographic purpose at sub-rural area\u003cbr\u003e\u003cbr\u003e3. Light pollution filter do not eliminate the effects of light pollution or increase the object's brightness. In many cases, they increase the contrast between nebula and night sky, not brightening the nebula\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/1_60e442fd-5c66-4334-875d-157f06614813.jpg?v=1759433200\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/2_2053e485-f631-4ab0-83d0-0521444c8031.jpg?v=1759433211\" alt=\"\"\u003e\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable style=\"box-sizing: border-box; border-collapse: collapse; margin: 0px auto 15px; width: 1240px; border-spacing: 0px; color: #424242; font-family: Poppins, Helvetica, Tahoma, Arial, serif; font-size: 14px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: left; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: #ffffff; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;\"\u003e\n\u003ctbody style=\"box-sizing: border-box;\"\u003e\n\u003ctr style=\"box-sizing: border-box;\"\u003e\n\u003ctd style=\"box-sizing: border-box; padding: 7px 12px; text-align: center; font-size: 12px; border: 1px solid #e8e9eb;\"\u003eModel \u003c\/td\u003e\n\u003ctd style=\"box-sizing: border-box; padding: 7px 12px; text-align: center; font-size: 12px; border: 1px solid #e8e9eb;\"\u003eF9155A\u003c\/td\u003e\n\u003ctd style=\"box-sizing: border-box; padding: 7px 12px; text-align: center; font-size: 12px; border: 1px solid #e8e9eb;\"\u003eF9155B\u003c\/td\u003e\n\u003ctd style=\"box-sizing: border-box; padding: 7px 12px; text-align: center; font-size: 12px; border: 1px solid #e8e9eb;\"\u003eF9155D\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"box-sizing: border-box;\"\u003e\n\u003ctd style=\"box-sizing: border-box; padding: 7px 12px; text-align: center; font-size: 12px; border: 1px solid #e8e9eb;\"\u003eSize\u003c\/td\u003e\n\u003ctd style=\"box-sizing: border-box; padding: 7px 12px; text-align: center; font-size: 12px; border: 1px solid #e8e9eb;\"\u003e1.25‘’\u003c\/td\u003e\n\u003ctd style=\"box-sizing: border-box; padding: 7px 12px; text-align: center; font-size: 12px; border: 1px solid #e8e9eb;\"\u003e2‘’\u003c\/td\u003e\n\u003ctd style=\"box-sizing: border-box; padding: 7px 12px; text-align: center; font-size: 12px; border: 1px solid #e8e9eb;\"\u003eEOS-C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"box-sizing: border-box;\"\u003e\n\u003ctd style=\"box-sizing: border-box; padding: 7px 12px; text-align: center; font-size: 12px; border: 1px solid #e8e9eb;\"\u003eThread\u003c\/td\u003e\n\u003ctd style=\"box-sizing: border-box; padding: 7px 12px; text-align: center; font-size: 12px; border: 1px solid #e8e9eb;\"\u003eStandard M28.5*0.6\u003c\/td\u003e\n\u003ctd style=\"box-sizing: border-box; padding: 7px 12px; text-align: center; font-size: 12px; border: 1px solid #e8e9eb;\"\u003eStandard M48*0.75\u003c\/td\u003e\n\u003ctd style=\"box-sizing: border-box; padding: 7px 12px; text-align: center; font-size: 12px; border: 1px solid #e8e9eb;\"\u003eCanon EOS-C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"box-sizing: border-box;\"\u003e\n\u003ctd style=\"box-sizing: border-box; padding: 7px 12px; text-align: center; font-size: 12px; border: 1px solid #e8e9eb;\"\u003ethickness\u003c\/td\u003e\n\u003ctd style=\"box-sizing: border-box; padding: 7px 12px; text-align: center; font-size: 12px; border: 1px solid #e8e9eb;\"\u003e1.85mm\u003c\/td\u003e\n\u003ctd style=\"box-sizing: border-box; padding: 7px 12px; text-align: center; font-size: 12px; border: 1px solid #e8e9eb;\"\u003e1.85mm\u003c\/td\u003e\n\u003ctd style=\"box-sizing: border-box; padding: 7px 12px; text-align: center; font-size: 12px; border: 1px solid #e8e9eb;\"\u003e1.85mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"box-sizing: border-box;\"\u003e\n\u003ctd style=\"box-sizing: border-box; padding: 7px 12px; text-align: center; font-size: 12px; border: 1px solid #e8e9eb;\"\u003eType\u003c\/td\u003e\n\u003ctd style=\"box-sizing: border-box; padding: 7px 12px; text-align: center; font-size: 12px; border: 1px solid #e8e9eb;\" colspan=\"3\"\u003eCity Light Suppression Filter (CLS Filter)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cp\u003eSVBONY 1.25''\/2'' EOS-C CLS Light Pollution Broadband Filters\u003c\/p\u003e\n\u003ch3\u003eManuals \u0026amp; Warranty\u003c\/h3\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/istronomyplus.com\/pages\/svbony-warranty\" target=\"_blank\"\u003eSvbony 1-Year Warranty \u003c\/a\u003e\u003c\/p\u003e","brand":"Svbony","offers":[{"title":"1.25\"","offer_id":43971230499045,"sku":"SVB-F9155A","price":31.0,"currency_code":"CAD","in_stock":true},{"title":"2\"","offer_id":43971230531813,"sku":"SVB-F9155B","price":53.0,"currency_code":"CAD","in_stock":true},{"title":"EOS-C","offer_id":43971230564581,"sku":"SVB-F9155D","price":73.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/svbony-1-25-2-eos-c-cls-light-pollution-broadband-filters-astronomy-plus.webp?v=1690489343"},{"product_id":"antlia-alp-t-dual-band-5nm-sii-hb-filter-1","title":"Antlia ALP-T 2\" Dual Band 5nm SII \u0026 Hb Filter","description":"\u003ch1 data-mce-fragment=\"1\"\u003eAntlia ALP-T Dual Band 5nm SII\u0026amp;Hb Filter\u003c\/h1\u003e\n\u003cp\u003eThe ALP-T dual band 5nm SII\u0026amp;Hb filter is a dual line-pass filter, which lets the deep red Sulfur-II line and the blue Hydrogen-Beta line through and is used with one-shot color (OSC) cameras such as DSLR's or astronomical OSC cameras. It is a significant addition to the\u003cbr data-mce-fragment=\"1\"\u003epopular Antlia ALP-T dual band 5nm Ha\u0026amp;OIII filter and enables false-color images and narrow-band nebula images using OSC. When capturing data with this filter, the nebulae are recorded with greater contrast against the background than without it. The combination of these two dual band filters allows extreme narrow-band images with OSC cameras by capturing the spectral data from 4 channels i.e. Ha\/OIII\/SII\/Hb. The spectrum of these four channels can be separated and recombined into various colour palettes in your post-processing. The resulting images can be used for luminance contrast enhancement of traditional RGB-balanced images or creation of images in various popular false-color palettes such as H-O-Hb, S-H-O, H-S-OHb, H-O-O etc.\u003cbr data-mce-fragment=\"1\"\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e \u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eWhy design SII\u0026amp;Hb bands pass instead of OIII\u0026amp;SII bands?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003eThe filter is dedicated to capture H-beta and SII emission lines. We know that SII is singly ionized sulfur that emits light in the deep red part of the spectrum, beyond H-alpha, but the contribution of H-beta to emission lines in nebulae is frequently overlooked, even though it is the second most common Hydrogen emission after the H-alpha line. Capturing more OIII will boost the existing signal but does not give more information. However Hb has the potential to reveal structures not seen using OIII. The design is to capture the H-beta emission line in the certain nebulas that contain some blue spectrum, this cannot be captured by H-alpha, SII and OIII filters. Greater and richer details will be captured in many nebulae images to achieve results with a superior signal-to-noise ratio.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eIt is generally accepted that the OIII signal is a relatively weaker contributor to nebulae images. The OIII bandpass sensitivity is an important consideration for any nebulae filter. Most colour cameras (OSC) use a RGGB Bayer pattern. The allocation of twice as many green pixels as\u003cbr data-mce-fragment=\"1\"\u003ecompared to either red or blue pixels, enables a much-improved capture of the OIII signal. Furthermore, higher OIII signal can be achieved by additional exposure using the Antlia ALP-T Ha\u0026amp;O3 filter, then isolating the GB channels, followed by synthesis of an OIII channel to add into your stack.\u003cbr data-mce-fragment=\"1\"\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e In the situation where you may only want to add SII to your Ha\u0026amp;OIII data, then it may be preferable to buy one SII narrowband filter and achieve a cleaner SII spectral emission. However, our new filter design (SII\u0026amp;Hb) includes the H-beta emission line which provides a distinct improvement in nebulae contrast and improved feature separation in Hb areas.\u003cbr data-mce-fragment=\"1\"\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eAntlia ALP-T Dual Band 5nm Ha\u0026amp;OIII filter:\u003c\/strong\u003e Dual band filter with a very narrow passband of 5nm in OIII and H-alpha to achieve a higher signal-to-noise ratio. The resulting contrast improvement for OSC is impressive.\u003cbr data-mce-fragment=\"1\"\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eAntlia ALP-T Dual Band 5nm SII\u0026amp;Hb filter:\u003c\/strong\u003e Dual band filter with a very narrow pass band of 5nm H-beta and S-II. This filter is ideal for increasing contrast of nebulae that emit in the sulfur and H-beta range using OSC. It provides additional feature separation and isolation in Hb areas.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eThe advanced multi-coatings on Antlia ALP-T dual band filters effectively isolates the red, Ha line, blue-green, OIII line, deep red SII and the blue H-beta lines from emission nebulae, with almost total suppression of optical density (OD)4.5 on unwanted wavelengths from light pollution, moonlight, and airglow. The result is that both the ALP-T dual band 5nm Ha\u0026amp;OIII and SII\u0026amp;Hb filter creates a superior signal-to-noise ratio and better contrast in your OSC images.\u003cbr data-mce-fragment=\"1\"\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eThe main features and application\u003c\/strong\u003e\u003cbr data-mce-fragment=\"1\"\u003ePasses SII 672.4nm line and H-Beta 486.1nm line;\u003cbr data-mce-fragment=\"1\"\u003eEngineered specifically for use with DSLR, CMOS, and CCD color cameras;\u003cbr data-mce-fragment=\"1\"\u003eUltra FWHM 5nm allows for increasing in exposure time;\u003cbr data-mce-fragment=\"1\"\u003eRecommended to be used with ALP-T Dual Band 5nm Ha\u0026amp;OIII filter to create images with better signal to noise and better isolation between the 4 channels;\u003cbr data-mce-fragment=\"1\"\u003eSuppression of optical density (OD)4.5 on unwanted wavelengths improves signal-to-noise;\u003cbr data-mce-fragment=\"1\"\u003eExtremely steep bandpass and blackened edges of unmounted sizes to minimize internal reflections;\u003cbr data-mce-fragment=\"1\"\u003eIdeal flat-top and moderate bandpass reducing spectrum down shifts;\u003cbr data-mce-fragment=\"1\"\u003eIon Gun Assisted Deposition coating technology on the double-sided polished substrate making it the most consistent and accurate light pollution suppression filter;\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eNot Recommended:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eSolar imaging\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eNight visual observation\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eNot Permitted:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eDO NOT LOOK AT THE SUN WITH THIS FILTER\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eSerious eye damage will result if you fail to observe the warning\u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eTechnical Specifications \u003cbr data-mce-fragment=\"1\"\u003e\n\u003c\/h3\u003e\n\u003ctable align=\"LEFT\" border=\"1\" width=\"585px\" data-mce-fragment=\"1\"\u003e\n\u003ctbody data-mce-fragment=\"1\"\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd valign=\"top\" width=\"22.6%\" data-mce-fragment=\"1\"\u003e\u003c\/td\u003e\n\u003ctd valign=\"top\" width=\"25.3%\" data-mce-fragment=\"1\"\u003eSulfur-II\u003c\/td\u003e\n\u003ctd valign=\"top\" width=\"24.7%\" data-mce-fragment=\"1\"\u003eHydrogen-Beta\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd valign=\"top\" width=\"22.6%\" data-mce-fragment=\"1\"\u003eFWHM\u003c\/td\u003e\n\u003ctd valign=\"top\" width=\"25.3%\" data-mce-fragment=\"1\"\u003e5nm\u003c\/td\u003e\n\u003ctd valign=\"top\" width=\"24.7%\" data-mce-fragment=\"1\"\u003e5nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd valign=\"top\" width=\"22.6%\" data-mce-fragment=\"1\"\u003eCWL (Central Wavelength)\u003c\/td\u003e\n\u003ctd valign=\"top\" width=\"25.3%\" data-mce-fragment=\"1\"\u003e672.4nm\u003c\/td\u003e\n\u003ctd valign=\"top\" width=\"24.7%\" data-mce-fragment=\"1\"\u003e486.1nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd valign=\"top\" width=\"22.6%\" data-mce-fragment=\"1\"\u003ePeak Transmission\u003c\/td\u003e\n\u003ctd valign=\"top\" width=\"25.3%\" data-mce-fragment=\"1\"\u003e90%\u003c\/td\u003e\n\u003ctd valign=\"top\" width=\"24.7%\" data-mce-fragment=\"1\"\u003e85%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd valign=\"top\" width=\"22.6%\" data-mce-fragment=\"1\"\u003eBlocking\u003c\/td\u003e\n\u003ctd valign=\"top\" rowspan=\"1\" colspan=\"2\" data-mce-fragment=\"1\"\u003e≥OD4.5 \u003cbr data-mce-fragment=\"1\"\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd valign=\"top\" width=\"22.6%\" data-mce-fragment=\"1\"\u003eFilter Thickness\u003c\/td\u003e\n\u003ctd valign=\"top\" colspan=\"2\" data-mce-fragment=\"1\"\u003e2mm+\/-0.05mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp data-mce-fragment=\"1\"\u003e \u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eFilter Ring:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e2” (M48*0.75)\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eUltra-thin filter cell to minimize vignetting by maximize possible clear aperture\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eBlack Anodized Finish\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eLaser Engraving No Fading\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eIn the Box\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003eAntlia ALP-T Dual Band 5nm SII\u0026amp;Hb Filter\u003c\/p\u003e\n\u003cdiv class=\"value\" data-mce-fragment=\"1\"\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eWarranty \u0026amp; Manuals\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003eAntlia \u003cspan data-mce-fragment=\"1\"\u003e3-Years Against Delamination\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":44097503002853,"sku":"AF-ALP-T-2-SIIHB","price":497.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/antlia-alp-t-2-dual-band-5nm-siiandhb-filter-astronomy-plus-1.webp?v=1690490638"},{"product_id":"f9198f","title":"SVBONY SV405CC Cooled Color Camera IMX294","description":"\u003ch2\u003eSVBONY SV405CC Cooled Color Camera for Deep Space Astrophotography IMX294\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eSv405cc with UV\/IR Cut filter can achieve pure color shooting effect of deep space objects. It can photograph nebulae, galaxies and other deep space objects and the moon.\u003c\/li\u003e\n\u003cli\u003eSv405cc with UHC filter can effectively reduce urban light damage, or get better shooting effect of deep space celestial bodies, severely suppress light damage, and is suitable for places with strong urban light damage. It can photograph nebulae, galaxies and other deep space objects.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cimg height=\"225\" width=\"524\" style=\"display: block; margin-left: auto; margin-right: auto;\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/6378899810857509888071027_480x480.jpg?v=1686757289\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSv405cc combined with CLS filter can effectively reduce urban light damage, obtain better deep space celestial photography effect, and slightly suppress light damage. It is suitable for places with light damage in villages and towns, and can obtain more details while suppressing light damage. It can photograph nebulae, galaxies and other deep space objects.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp style=\"text-align: center;\"\u003eFilter for Camera\u003cbr\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003eConnection Mode\u003c\/td\u003e\n\u003ctd\u003eConnection Mode\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: center;\"\u003eF9127A\/B-svbony 2 inch \/1.25 inch UV\/IR Cut astronomical photography filter\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\"\u003e2-inch assembly scheme: F9127B+M42M-M48F-16.5+F9198F\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\"\u003e1.25 inch assembly scheme: F9127A+1.25 inch T-shaped tube +F9198F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: center;\"\u003eF9131A\/B- svbony1.25 inch \/2 inch UHC filter\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\"\u003e2-inch assembly scheme:F9131B+M42M-M48F-16.5+F9198F\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\"\u003e1.25 inch assembly scheme:F9131A+1.25 inch T-shaped tube+F9198F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: center;\"\u003eF9155A\/B- svbony 1.25 inch \/2 inch CLS filter\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\"\u003e2-inch assembly scheme:F9155B+M42M-M48F-16.5+F9198F\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\"\u003e1.25 inch assembly scheme:F9155A+1.25 inch T-shaped tube+F9198F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003e\u003cbr\u003e\u003c\/h3\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: center;\"\u003eModel\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\"\u003eSV405CC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: center;\"\u003eSensor\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\"\u003e4\/3'' SONY IMX294 CMOS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: center;\"\u003eSensor size\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\"\u003e19.2mm*13mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: center;\"\u003ePixel Size\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\"\u003e4.63*4.63μm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: center;\"\u003eDiagonal\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\"\u003e23.2mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: center;\"\u003eResolution\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\"\u003e11.7 megapixels 4144*2822\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: center;\"\u003eExposure time\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\"\u003e0.05ms-2000s\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: center;\"\u003eQE peak\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\"\u003e75%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: center;\"\u003eReadout noise\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\"\u003e1.2e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: center;\"\u003eFull well\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\"\u003e63ke\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: center;\"\u003eADC\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\"\u003e14 bit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: center;\"\u003eMaximum Frame Rate\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\"\u003e19 FPS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: center;\"\u003eInterface\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\"\u003eUSB 3.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: center;\"\u003eBack Focus\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\"\u003e6.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: center;\"\u003eROI\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\"\u003e Support\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: center;\"\u003eProtective window\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\"\u003eAR coating\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: center;\"\u003eDigital Noise Reduction\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\"\u003eSupport\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: center;\"\u003eBinning\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\"\u003eBIN1,BIN2,BIN3,BIN4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: center;\"\u003eInterface Type\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\"\u003eM42\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: center;\"\u003eSupported OS\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\"\u003eWindows, Linux, Raspberry Pi \u0026amp; Mac OS \u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: center;\"\u003ePower Consumpton\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\"\u003e200mA 5V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: center;\"\u003eWorking Temperature\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\"\u003e-10℃-50℃\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: center;\"\u003eStorage Temperature\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\"\u003e-20℃-60℃\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: center;\"\u003eWorking Relative Humidity\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\"\u003e20％-80％\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: center;\"\u003eStorage Relative Humidity\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\"\u003e20％-95％\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eSVBONY SV405CC Cooled Color Camera for Deep Space Astrophotography IMX294 with selected 1.25'' Filters :\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003esv405cc+1.25'' UV IR Cut Filter\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003esv405cc+ 2'' UV IR Cut Filter\u003c\/li\u003e\n\u003cli\u003esv405cc+ 1.25'' UHC Filter\u003c\/li\u003e\n\u003cli\u003esv405cc+ 2'' UHC Filter\u003c\/li\u003e\n\u003cli\u003esv405cc+ 1.25'' CLS Filter\u003c\/li\u003e\n\u003cli\u003esv405cc+ 2'' CLS Filter\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eSupply Unit\u003c\/p\u003e\n\u003cp\u003eCamera Bag\u003c\/p\u003e\n\u003cp\u003eUser Manual\u003c\/p\u003e\n\u003cp\u003e2\" Cover\u003c\/p\u003e\n\u003cp\u003eT2 Adapter\u003c\/p\u003e\n\u003cp\u003eM42-M48 Ring\u003c\/p\u003e\n\u003cp\u003eT2-1.25\" Adapter\u003c\/p\u003e\n\u003cp\u003eM42M-M42F-21L\u003c\/p\u003e\n\u003cp\u003eM42M-M48F-16.5L\u003c\/p\u003e\n\u003cp\u003e1.25\" T-Adapter\u003c\/p\u003e\n\u003cp\u003eUSB3.0 Data Cable\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eManuals \u0026amp; Warranty\u003c\/h3\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/istronomyplus.com\/pages\/svbony-warranty\" target=\"_blank\"\u003eSvbony 1-Year Warranty \u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Svbony","offers":[{"title":"Camera with 1.25'' UV IR Cut Filter","offer_id":44106916233445,"sku":"SVB-F9198F-F9127A","price":835.0,"currency_code":"CAD","in_stock":true},{"title":"Camera with 2'' UV IR Cut Filter","offer_id":44106916266213,"sku":"SVB-F9198F-F9127B","price":838.0,"currency_code":"CAD","in_stock":true},{"title":"Camera with 1.25'' UHC  Filter","offer_id":44106916298981,"sku":"SVB-F9198F-F9131A","price":846.0,"currency_code":"CAD","in_stock":true},{"title":"Camera with 2'' UHC  Filter","offer_id":44106916331749,"sku":"SVB-F9198F-F9131B","price":873.0,"currency_code":"CAD","in_stock":true},{"title":"Camera with 1.25'' CLS  Filter","offer_id":44106916364517,"sku":"SVB-F9198F-F9155A","price":844.0,"currency_code":"CAD","in_stock":true},{"title":"Camera with 2'' CLS  Filter","offer_id":44106916397285,"sku":"SVB-F9198F-F9155B","price":866.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/svbony-sv405cc-cooled-color-camera-imx294-astronomy-plus-1.jpg?v=1690490948"},{"product_id":"idas-lps-c1-m48-filter","title":"Sightron Light Pollution LPS-C1 Filter 2\" (M48)","description":"\u003ch2\u003eSightron LPS-C1 M48 Filter (2\")\u003c\/h2\u003e\n\u003cdiv\u003e\n\u003cdiv aria-labelledby=\"tab-title-description\" role=\"tabpanel\" id=\"tab-description\"\u003e\n\u003cp\u003e(LPS) Light Pollution Suppression Filter\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eEffectively suppressing white LED sky glow\u003c\/li\u003e\n\u003cli\u003eMaintains the good color balance under the white LED dominant sky (See one of gallery images)\u003c\/li\u003e\n\u003cli\u003eAlso designed for enhancing the contrast of the comet emission lines\u003c\/li\u003e\n\u003cli\u003eGlass Type : Fused Quartz\u003c\/li\u003e\n\u003cli\u003eGlass thickness : 1.5mm\u003c\/li\u003e\n\u003cli\u003eM48 mounted\u003c\/li\u003e\n\u003cli\u003eMade in Japan\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cbr\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"IDAS","offers":[{"title":"Default Title","offer_id":44154114965733,"sku":"SIG-LPSC1-48","price":265.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/idas-lps-c1-m48-filter-astronomy-plus-1.webp?v=1690492254"},{"product_id":"antlia-quad-band-anti-light-pollution-filter-2-mounted","title":"Antlia Quad Band Anti-Light Pollution Filter 2\" Mounted (QUAD-2)","description":"\u003ch1\u003eAntlia Quad Band Anti-Light Pollution Filter 2\" Mounted\u003c\/h1\u003e\n\u003cp\u003eThe Antlia Quad Band Anti-Light Pollution Filter is a light suppression filter for color and monochrome cameras. It is able to shoot most deep sky objects like galaxies, reflection nebulae, emission nebula, and star clusters from a Bortle 8 location to Bortle 1 as its spectral transmission passes through visible light region, near-ultraviolet (NUV) and near-infrared (NIR) region. Antlia Quad Band filter has a broad bandpass designed to cope with faster optics up to the f\/2 focal ratio.\u003c\/p\u003e\n\u003cp\u003eConsidering the high quantum efficiency (QE) characteristics of the latest cameras in the near-infrared region and this region is less susceptible to artificial light pollution, the Antlia Quad Band Light-Pollution Filter add shigh transmission in the near-infrared (NIR) band. This spectrum design improves image signal-to-noise ratio and contrast by capturing signals in visible bands and NIR region, while also maintaining good color balance and being easier to manage in post-processing. \u003c\/p\u003e\n\u003cp\u003eCertain full-spectrum objects like M51, M83 possess significant signal in the near-infrared (NIR) region, you can possibly capture these deep sky objects more contrasted with the Antlia Quad Band filter under light polluted condition. When using this filter with a camera that has UV\/IR cut protective glass, the visible band transmission signal is retained, but the IR cut limits your ability to capture targets with infrared signal. Therefore, the Antlia Quad Band filter is more suitable for cameras with AR protective glass as they cancapture both NIR and visible band signals.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThe main features and application:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eAnti-Light Pollution\u003cbr\u003eThe Antlia Quad Band filter is an effective solution for reducing light pollution, as it cuts out most of theorange-yellow lights from 589nm and part of blue lights from LEDs\u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePossible to shoot over 95% of deep sky objects\u003c\/li\u003e\n\u003cli\u003eUnique spectral design offers more possibilities for astrophotography\u003c\/li\u003e\n\u003cli\u003eHigh transmittance of the main emission lines Ha\/SII\/OIII\/H-Beta in the visible region, enhances the astrophotography's high SNR and contrast;\u003c\/li\u003e\n\u003cli\u003eNear-infrared (NIR) region transmittance\u003c\/li\u003e\n\u003cli\u003ePassing near infrared region is for shooting deep sky objects that cannot be shot with other filters without NIR transmission\u003c\/li\u003e\n\u003cli\u003eThe broad bandpass designed to cope with faster optics up to the f\/2 focal ratio. - Good color balance\u003c\/li\u003e\n\u003cli\u003eIt is easier to achieve color balance by adding the short-wavelength transmission\u003c\/li\u003e\n\u003cli\u003eSuperior optical reliability reduces post image processing\u003c\/li\u003e\n\u003cli\u003eBasic Substrate: Optical, Single \/ Non-glued substrate\u003c\/li\u003e\n\u003cli\u003eSurface Quality: S\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/li\u003e\n\u003cli\u003eTransmitted Wavefront: Lambda\/4 or better. - Parallelism: less than 30 arcsec\u003c\/li\u003e\n\u003cli\u003eWarranty: 3-years against delamination\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eFilter Ring:\u003c\/h2\u003e\n\u003cp\u003eAntlia standard ring:1.25’’ (M28.5*0.6)，2’’(M48*0.75)\u003cbr\u003eUltra-thin filter cell to minimize vignetting by maximize possible clear aperture\u003cbr\u003eBlack Anodized Finish\u003cbr\u003eLaser Engraving No Fading\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003eNot Recommended:\u003c\/h2\u003e\n\u003cp\u003eSolar imaging\u003cbr\u003eNight visual observation\u003c\/p\u003e\n\u003ch2\u003eNot Permitted:\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eDO NOT LOOK AT THE SUN WITH THIS FILTER\u003c\/strong\u003e\u003cbr\u003eSerious eye damage will result if you fail to observe the warning\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable cellpadding=\"0\" cellspacing=\"0\" 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rgb(167, 167, 167);\"\u003e\u003cspan style=\"vertical-align: baseline;\"\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%; white-space: normal; text-align: center; vertical-align: middle; border-right: 1px solid rgb(167, 167, 167); border-bottom: 1px solid rgb(167, 167, 167); border-top: 1px solid rgb(167, 167, 167);\"\u003e\u003cspan style=\"font-family: Arial; font-size: 12pt; font-weight: bold; vertical-align: baseline;\"\u003eH-alpha\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%; white-space: normal; text-align: center; vertical-align: middle; border: 1px solid rgb(167, 167, 167);\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003eS-II\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%; white-space: normal; text-align: center; vertical-align: middle; border: 1px solid rgb(167, 167, 167);\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003eO-III\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%; white-space: normal; text-align: center; vertical-align: middle; border: 1px solid rgb(167, 167, 167);\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003eH-beta\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%; white-space: normal; text-align: center; vertical-align: middle; border: 1px solid rgb(167, 167, 167);\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003eNII\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 14.25pt;\"\u003e\n\u003ctd colspan=\"1\" rowspan=\"2\" style=\"width: 29.2894%; white-space: normal; text-align: center; vertical-align: middle; border: 1px solid rgb(167, 167, 167);\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10.5pt; vertical-align: baseline;\"\u003eWavelength\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd colspan=\"1\" rowspan=\"2\" style=\"width: 14.2114%; white-space: normal; text-align: center; vertical-align: middle; border-right: 1px solid rgb(167, 167, 167); border-bottom: 1px solid rgb(167, 167, 167); border-top: 1px solid rgb(167, 167, 167);\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10.5pt; vertical-align: baseline;\"\u003e656.3nm\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%; white-space: normal; text-align: center; vertical-align: middle; border-right: 1px solid rgb(167, 167, 167); border-left: 1px solid rgb(167, 167, 167); border-top: 1px solid rgb(167, 167, 167);\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10.5pt; vertical-align: baseline;\"\u003e671.6nm\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%; white-space: normal; text-align: center; vertical-align: middle; border-right: 1px solid rgb(167, 167, 167); border-left: 1px solid rgb(167, 167, 167); border-top: 1px solid rgb(167, 167, 167);\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10.5pt; vertical-align: baseline;\"\u003e495.9nm,\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd colspan=\"1\" rowspan=\"2\" style=\"width: 14.2114%; white-space: normal; text-align: center; vertical-align: middle; border: 1px solid rgb(167, 167, 167);\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10.5pt; vertical-align: baseline;\"\u003e486.1nm\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%; white-space: normal; text-align: center; vertical-align: middle; border-right: 1px solid rgb(167, 167, 167); border-left: 1px solid rgb(167, 167, 167); border-top: 1px solid rgb(167, 167, 167);\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10.5pt; vertical-align: baseline;\"\u003e658.3nm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 14.25pt;\"\u003e\n\u003ctd style=\"width: 14.2114%; white-space: normal; text-align: center; vertical-align: middle; border-right: 1px solid rgb(167, 167, 167); border-bottom: 1px solid rgb(167, 167, 167); border-left: 1px solid rgb(167, 167, 167);\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10.5pt; vertical-align: baseline;\"\u003e673.1nm\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%; white-space: normal; text-align: center; vertical-align: middle; border-right: 1px solid rgb(167, 167, 167); border-bottom: 1px solid rgb(167, 167, 167); border-left: 1px solid rgb(167, 167, 167);\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10.5pt; vertical-align: baseline;\"\u003e500.7nm\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%; white-space: normal; text-align: center; vertical-align: middle; border-right: 1px solid rgb(167, 167, 167); border-bottom: 1px solid rgb(167, 167, 167); border-left: 1px solid rgb(167, 167, 167);\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10.5pt; vertical-align: baseline;\"\u003e654.8nm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 38.25pt;\"\u003e\n\u003ctd style=\"width: 29.2894%; white-space: normal; text-align: center; vertical-align: middle; border: 1px solid rgb(167, 167, 167);\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10.5pt; vertical-align: baseline;\"\u003ePeak Transmission\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%; white-space: normal; text-align: center; vertical-align: middle; border-right: 1px solid rgb(167, 167, 167); border-bottom: 1px solid rgb(167, 167, 167); border-top: 1px solid rgb(167, 167, 167);\"\u003e\n\u003cspan style=\"font-family: Microsoft YaHei; font-size: 10.5pt; vertical-align: baseline;\"\u003e＞\u003c\/span\u003e\u003cspan style=\"font-family: Arial; font-size: 10.5pt; vertical-align: baseline;\"\u003e92%\u003c\/span\u003e\n\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%; white-space: normal; text-align: center; vertical-align: middle; border: 1px solid rgb(167, 167, 167);\"\u003e\n\u003cspan style=\"font-family: Microsoft YaHei; font-size: 10.5pt; vertical-align: baseline;\"\u003e＞\u003c\/span\u003e\u003cspan style=\"font-family: Arial; font-size: 10.5pt; vertical-align: baseline;\"\u003e92%\u003c\/span\u003e\n\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%; white-space: normal; text-align: center; vertical-align: middle; border: 1px solid rgb(167, 167, 167);\"\u003e\n\u003cspan style=\"font-family: Microsoft YaHei; font-size: 10.5pt; vertical-align: baseline;\"\u003e＞\u003c\/span\u003e\u003cspan style=\"font-family: Arial; font-size: 10.5pt; vertical-align: baseline;\"\u003e92%\u003c\/span\u003e\n\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%; white-space: normal; text-align: center; vertical-align: middle; border: 1px solid rgb(167, 167, 167);\"\u003e\n\u003cspan style=\"font-family: Microsoft YaHei; font-size: 10.5pt; vertical-align: baseline;\"\u003e＞\u003c\/span\u003e\u003cspan style=\"font-family: Arial; font-size: 10.5pt; vertical-align: baseline;\"\u003e92%\u003c\/span\u003e\n\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%; white-space: normal; text-align: center; vertical-align: middle; border: 1px solid rgb(167, 167, 167);\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10.5pt; vertical-align: baseline;\"\u003e92%\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 14.25pt;\"\u003e\n\u003ctd style=\"width: 29.2894%; white-space: normal; text-align: center; vertical-align: middle; border: 1px solid rgb(167, 167, 167);\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10.5pt; vertical-align: baseline;\"\u003eBlocking\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd colspan=\"5\" rowspan=\"1\" style=\"width: 71.0572%; white-space: normal; text-align: center; vertical-align: middle; border-right: 1px solid rgb(167, 167, 167); border-bottom: 1px solid rgb(167, 167, 167); border-top: 1px solid rgb(167, 167, 167);\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10.5pt; vertical-align: baseline;\"\u003e≥OD4@ 300-1050nm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 38.25pt;\"\u003e\n\u003ctd style=\"width: 29.2894%; white-space: normal; text-align: center; vertical-align: middle; border: 1px solid rgb(167, 167, 167);\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10.5pt; vertical-align: baseline;\"\u003eFilter Thickness\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd colspan=\"5\" rowspan=\"1\" style=\"width: 71.0572%; white-space: normal; text-align: center; vertical-align: middle; border-right: 1px solid rgb(167, 167, 167); border-bottom: 1px solid rgb(167, 167, 167); border-top: 1px solid rgb(167, 167, 167);\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10.5pt; vertical-align: baseline;\"\u003e2mm+\/-0.05mm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 14.25pt;\"\u003e\n\u003ctd style=\"width: 29.2894%; white-space: nowrap; text-align: left; vertical-align: bottom; border-top: 1px solid rgb(167, 167, 167);\"\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%;\"\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%;\"\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%;\"\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%;\"\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 14.2114%;\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/2025_Quad_Band_filter_spectrum_curve.jpg?v=1737230060\" alt=\"\"\u003e\u003c\/p\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cp\u003eAntlia Quad Band Anti-Light Pollution Filter 2\" Mounted\u003c\/p\u003e\n\u003ch3\u003eWarranty \u0026amp; Manuals\u003c\/h3\u003e\n\u003cp\u003eAntlia 3-Years Warranty against Delamination\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":44272880877797,"sku":"AF-QUAD-2","price":281.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/antlia-quad-band-anti-light-pollution-filter-2-mounted-quad-2-astronomy-plus.webp?v=1715808614"},{"product_id":"optolong-l-quad-enhance-filter-2-l-qef","title":"Optolong L-Quad Enhance Filter 2\" Light Pollution Suppression Filter (L-QEF)","description":"\u003ch2\u003eOptolong L-Quad Enhance Filter\u003c\/h2\u003e\n\u003cp\u003eL-Quad Enhance Filter (L-QEF) is a quad bandpass light pollution suppression filter for colour cameras. It effectively suppresses the transmission of light pollution wavelengths, especially light pollution generated by artificial lighting (including mercury and sodium lamps), as well as the effects of natural skylight-induced effects on the shot, thus effectively enhancing the contrast and details of the celestial bodies, and making the objects more distinct and stereoscopic. This filter provides better color balance while improving resistance of light pollution. L-QEF can be used for both wide field astrophotography, such as the Milky Way in Summer and Winter, and deep sky objects such as nebulae, galaxies, star clusters, and so forth; It allows you to save a lot of time during the shooting process and get better results at the same time. The design of quad bandpass maximises the colour balance of nebulae, galaxies and other broadband spectral targets.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCuts out light pollution from mercury and sodium lamps and produces a nice broadband image with minimal colour cast;\u003c\/li\u003e\n\u003cli\u003eSignal-to-noise ratio (SNR);\u003c\/li\u003e\n\u003cli\u003eNear IR cut-off to 1000nm, reducing the effects of IR noise;\u003c\/li\u003e\n\u003cli\u003eL-QEF has more than 90% transmittance of the nebula emission lines at H-Beta\/OIII\/H-Alpha\/SII, with cut-off depth from OD2 to OD4, thus providing a significant increase in resistance to light pollution. L-QEF is good for night sky from Bortel 1 to Bortel 7 levels; (Bortel 8, Bortel 9 environments shall not be recommended, kindly chose Optolong other narrow-band filters, 3nm, 7nm type of filters are available.);\u003c\/li\u003e\n\u003cli\u003eSuitable for wide range of deep sky targets: it covers most nebulae, galaxies, star clusters, reflected and emitted line signals astronomical objects with higher contrast and rich details while maintaining excellent colour balance. L-QEF is superior to other filters of the same type.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eSpectrum and Characteristic\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable style=\"width: 800px;\" cellspacing=\"1\" cellpadding=\"1\" border=\"1\" align=\"center\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSbustrate\u003c\/td\u003e\n\u003ctd\u003eoptical glass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThickness\u003c\/td\u003e\n\u003ctd\u003e1.85mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFWHM\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003eQuad bandpass filter\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking range\u003c\/td\u003e\n\u003ctd\u003e300-1000nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking Depth\u003c\/td\u003e\n\u003ctd\u003eOD2-OD4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurface quality\u003c\/td\u003e\n\u003ctd\u003e60\/40\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmitted Wavefront RMS\u003c\/td\u003e\n\u003ctd\u003eλ\/4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e Parallelism\u003c\/td\u003e\n\u003ctd\u003e30s\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCoating Technology\u003c\/strong\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e·Multi-layers anti-reflection coating\u003c\/li\u003e\n\u003cli\u003e·Non-cementing optical substrate coating\u003c\/li\u003e\n\u003cli\u003e·Optolong filter adopts precision coating based on Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL(central wavelength) no deviation affected by temperature change.\u003c\/li\u003e\n\u003cli\u003e·Planetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and Optical density of off-band.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eIn the Box\u003cbr\u003e\n\u003c\/h3\u003e\n\u003cp\u003eOptolong L-Quad Enhance Filter 2\"\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Optolong","offers":[{"title":"Default Title","offer_id":44431039660261,"sku":"OL-L-QEF-2","price":269.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/optolong-l-quad-enhance-filter-2-light-pollution-suppression-filter-l-qef-astronomy-plus.webp?v=1715808530"},{"product_id":"optolong-l-extreme-f2-fast-optics-dual-narrowband-l-extreme-f2","title":"Optolong L-eXtreme F2 Fast Optics Dual Narrowband 2\" (L-EXTREME-F2)","description":"\u003ch1\u003eOptolong L-eXtreme F2 Fast Optics Dual Narrowband\u003c\/h1\u003e\n\u003cp\u003eOptolong L-eXtreme F2 is a dual-band (500.7 nm and 656.28 nm, FWHM=7 nm) narrowband pass filter that meets the requirements for transmission at continuously varying angles. Astronomically characterised spectral lines (OIII, Ha) as the main transmission wavelengths, the OIII and H-Alpha nebula emission lines pass accurately at f2 - f3.3 Focal Ratio. It's a product that Optolong has developed specifically for fast optical systems, or fast focal ratio imaging systems. It has performed well on RASA, HyperStar and other fast ratio telescopes.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eTogether with one-shot colour astronomical cameras, monochrome astronomical cameras, and Digital SLR cameras, you can fast and quickly obtain clear and detailed images of the deep sky;\u003c\/li\u003e\n\u003cli\u003eIdeal for fast optical system, like RASA, Hyperstar and other fast focal ratio telescope users;\u003c\/li\u003e\n\u003cli\u003eRecommended for using fast optical system with focal ratio from f2 to f3.3;\u003c\/li\u003e\n\u003cli\u003eAnti-light pollution、better contrast、more details of the celestial bodies:This filter cuts out background light and noise beyond the target celestial bodies to get better details and contrast of the images. L-eXtreme F2 can effectively block light pollution so that the images will not affected by unwanted lights, and sky light of the background. You can quickly get satisfactory pictures in fast optical systems.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eSpectrum and Characteristic\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable style=\"width: 1000px;\" cellspacing=\"1\" cellpadding=\"1\" border=\"1\" align=\"center\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003eSbustrate\u003c\/span\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003eoptical glass\u003c\/span\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003eThickness\u003c\/span\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003e1.85mm\u003c\/span\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003eFWHM\u003c\/span\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003eOIII 7nm \u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003eHa 7nm\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003eBlocking range\u003c\/span\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003e300-1000nm\u003c\/span\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003eBlocking Depth\u003c\/span\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003e\u0026gt;OD4\u003c\/span\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003eSurface quality\u003c\/span\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003e60\/40\u003c\/span\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003eTransmitted Wavefront RMS\u003c\/span\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003eλ\/4\u003c\/span\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003e Parallelism\u003c\/span\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003e30s\u003c\/span\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eBased on the characteristics of celestial bodies’ emission lines and light pollution emission lines, the L-eXtreme F2 retains the prominent nebula OIII and Ha colours while blocking most of the light pollution. Specifically designed and optimally calculated for the characteristics of a fast optical system, the L-eXtreme F2 always keeps both OIII and Ha bands having high transmittance, which helps users to capture nebulae emission lines in these bands more accurately and quickly, and obtain better astrophotographic images.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCoating Technology\u003c\/strong\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eMulti-layers anti-reflection coating\u003c\/li\u003e\n\u003cli\u003eNon-cementing optical substrate coating\u003c\/li\u003e\n\u003cli\u003eOptolong filter adopts precision coating based on Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL(central wavelength) no deviation affected by temperature change.\u003c\/li\u003e\n\u003cli\u003ePlanetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and Optical density of off-band.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Optolong","offers":[{"title":"1.25\"","offer_id":48076807340261,"sku":"OPT-L-EXTREME-F2-125","price":333.0,"currency_code":"CAD","in_stock":true},{"title":"2\"","offer_id":48076807307493,"sku":"OPT-L-EXTREME-F2-2","price":431.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/optolong-l-extreme-f2-fast-optics-dual-narrowband-2-l-extreme-f2-astronomy-plus-1.webp?v=1715808525"},{"product_id":"anti-halo-pro-dual-band-2-ha-oiii-filter","title":"Player One Anti-Halo PRO Dual-Band 2″ Ha+OIII filter","description":"\u003ch1 class=\"product_title entry-title\" data-mce-fragment=\"1\"\u003eAnti-Halo PRO Dual-Band 2″ Ha+OIII filter\u003c\/h1\u003e\n\u003cp\u003e\u003cimg sizes=\"(max-width: 1931px) 100vw, 1931px\" srcset=\"https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/Anti-Halo-PRO-2-inch-Dual-Band-filter1.jpg 1931w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/Anti-Halo-PRO-2-inch-Dual-Band-filter1-300x140.jpg 300w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/Anti-Halo-PRO-2-inch-Dual-Band-filter1-1024x477.jpg 1024w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/Anti-Halo-PRO-2-inch-Dual-Band-filter1-768x358.jpg 768w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/Anti-Halo-PRO-2-inch-Dual-Band-filter1-1536x716.jpg 1536w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/Anti-Halo-PRO-2-inch-Dual-Band-filter1-600x280.jpg 600w\" height=\"749\" width=\"1607\" alt=\"\" src=\"http:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/Anti-Halo-PRO-2-inch-Dual-Band-filter1.jpg\" class=\"size-full wp-image-6214 aligncenter\"\u003e\u003c\/p\u003e\n\u003cdiv class=\"ast-oembed-container\"\u003e\u003ciframe src=\"https:\/\/www.youtube.com\/embed\/YPfMhKGyK1Y?feature=oembed\" height=\"675\" width=\"1200\" title=\"The BEST New Duo-Narrowband Filter for OSC? Player One Anti-Halo Pro\" allowfullscreen=\"\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" frameborder=\"0\"\u003e\u003c\/iframe\u003e\u003c\/div\u003e\n\u003ch4\u003e\n\u003cstrong\u003eAnti-Halo PRO\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e\u003cstrong\u003eDual-Band\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e\u003cstrong\u003e2″\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e\u003cstrong\u003eHa+OIII filter\u003c\/strong\u003e\n\u003c\/h4\u003e\n\u003cp data-section=\"2\" class=\"tgt\"\u003e\u003cspan data-group=\"2-0\" data-sentence=\"0\" data-section=\"2\" class=\"tgt\"\u003e\u003cstrong\u003eFrame thickness:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ebody 5mm+ thread 2.5mm, a total of 7.5mm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-section=\"4\" class=\"tgt\"\u003e\u003cspan data-group=\"4-0\" data-sentence=\"0\" data-section=\"4\" class=\"tgt\"\u003e\u003cstrong\u003eFilter glass thickness:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e1.85mm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eHa CWL:\u003cspan\u003e \u003c\/span\u003e\u003c\/b\u003e656.3nm     \u003cspan\u003e \u003c\/span\u003e\u003cb\u003eBand\u003cspan\u003e \u003c\/span\u003e\u003c\/b\u003e\u003cb\u003eWidth:\u003cspan\u003e \u003c\/span\u003e\u003c\/b\u003e3.7±0.5nm\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eOIII CWL:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e500.7nm    \u003cspan\u003e \u003c\/span\u003e\u003cb\u003eBand Width:\u003cspan\u003e \u003c\/span\u003e\u003c\/b\u003e3.2±0.5nm\u003c\/p\u003e\n\u003cp data-section=\"6\" class=\"tgt\"\u003e\u003cspan data-group=\"6-0\" data-sentence=\"0\" data-section=\"6\" class=\"tgt\"\u003e\u003cstrong\u003eTransmittance:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e\u0026gt;=\u003c\/span\u003e\u003cspan data-group=\"6-1\" data-sentence=\"1\" data-section=\"6\" class=\"tgt\"\u003e85%\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-section=\"8\" class=\"tgt\"\u003e\u003cspan data-group=\"8-0\" data-sentence=\"0\" data-section=\"8\" class=\"tgt\"\u003e\u003cstrong\u003eBlocking depth:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e\u003c\/span\u003eOD5 (200-1100nm)\u003c\/p\u003e\n\u003cp\u003e\u003cimg sizes=\"(max-width: 1929px) 100vw, 1929px\" srcset=\"https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/Anti-Halo-PRO-2-inch-Dual-Band-filter2.jpg 1929w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/Anti-Halo-PRO-2-inch-Dual-Band-filter2-300x140.jpg 300w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/Anti-Halo-PRO-2-inch-Dual-Band-filter2-1024x478.jpg 1024w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/Anti-Halo-PRO-2-inch-Dual-Band-filter2-768x359.jpg 768w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/Anti-Halo-PRO-2-inch-Dual-Band-filter2-1536x717.jpg 1536w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/Anti-Halo-PRO-2-inch-Dual-Band-filter2-600x280.jpg 600w\" height=\"656\" width=\"1405\" alt=\"\" src=\"http:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/Anti-Halo-PRO-2-inch-Dual-Band-filter2.jpg\" class=\"size-full wp-image-6215 aligncenter\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg sizes=\"(max-width: 1642px) 100vw, 1642px\" srcset=\"https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/Anti-Halo-PRO-2-inch-Dual-Band-filter3.jpg 1642w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/Anti-Halo-PRO-2-inch-Dual-Band-filter3-300x167.jpg 300w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/Anti-Halo-PRO-2-inch-Dual-Band-filter3-1024x570.jpg 1024w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/Anti-Halo-PRO-2-inch-Dual-Band-filter3-768x427.jpg 768w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/Anti-Halo-PRO-2-inch-Dual-Band-filter3-1536x855.jpg 1536w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/Anti-Halo-PRO-2-inch-Dual-Band-filter3-600x334.jpg 600w\" height=\"555\" width=\"997\" alt=\"\" src=\"http:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/Anti-Halo-PRO-2-inch-Dual-Band-filter3.jpg\" class=\"size-full wp-image-6216 aligncenter\"\u003e\u003c\/p\u003e\n\u003cp\u003eIn recent years, not only the single narrowband filters are chasing narrower band width, but also the dual band filters. From 7nm to 3nm, manufacturing process improved so fast!\u003c\/p\u003e\n\u003cp\u003eBut one thing is missing, halo control! The halo around stars is like a nightmare when you shoot some famous deepsky object!\u003c\/p\u003e\n\u003cp\u003eWhy only chasing super narrow bandwidth, but not deal with the halos?\u003c\/p\u003e\n\u003cp\u003eThe reason is, halo control is hardest part in manufacturing.\u003c\/p\u003e\n\u003cp\u003eMost people get used of it!\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eUntil now!\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg sizes=\"(max-width: 1958px) 100vw, 1958px\" srcset=\"https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/Anti-Halo-PRO-2-inch-Dual-Band-filter4.jpg 1958w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/Anti-Halo-PRO-2-inch-Dual-Band-filter4-300x142.jpg 300w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/Anti-Halo-PRO-2-inch-Dual-Band-filter4-1024x486.jpg 1024w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/Anti-Halo-PRO-2-inch-Dual-Band-filter4-768x364.jpg 768w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/Anti-Halo-PRO-2-inch-Dual-Band-filter4-1536x729.jpg 1536w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/Anti-Halo-PRO-2-inch-Dual-Band-filter4-600x285.jpg 600w\" height=\"701\" width=\"1478\" alt=\"\" src=\"http:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/Anti-Halo-PRO-2-inch-Dual-Band-filter4.jpg\" class=\"size-full wp-image-6217 aligncenter\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg sizes=\"(max-width: 1544px) 100vw, 1544px\" srcset=\"https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/Anti-Halo-PRO-2-inch-Dual-Band-filter5ss.jpg 1544w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/Anti-Halo-PRO-2-inch-Dual-Band-filter5ss-300x154.jpg 300w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/Anti-Halo-PRO-2-inch-Dual-Band-filter5ss-1024x527.jpg 1024w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/Anti-Halo-PRO-2-inch-Dual-Band-filter5ss-768x395.jpg 768w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/Anti-Halo-PRO-2-inch-Dual-Band-filter5ss-1536x790.jpg 1536w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/Anti-Halo-PRO-2-inch-Dual-Band-filter5ss-600x309.jpg 600w\" height=\"664\" width=\"1291\" alt=\"\" src=\"http:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/Anti-Halo-PRO-2-inch-Dual-Band-filter5ss.jpg\" class=\"aligncenter size-full wp-image-6265\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg sizes=\"(max-width: 1925px) 100vw, 1925px\" srcset=\"https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/Anti-Halo-PRO-2-inch-Dual-Band-filter6.jpg 1925w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/Anti-Halo-PRO-2-inch-Dual-Band-filter6-300x149.jpg 300w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/Anti-Halo-PRO-2-inch-Dual-Band-filter6-1024x510.jpg 1024w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/Anti-Halo-PRO-2-inch-Dual-Band-filter6-768x382.jpg 768w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/Anti-Halo-PRO-2-inch-Dual-Band-filter6-1536x764.jpg 1536w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/Anti-Halo-PRO-2-inch-Dual-Band-filter6-600x299.jpg 600w\" height=\"831\" width=\"1670\" alt=\"\" src=\"http:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/Anti-Halo-PRO-2-inch-Dual-Band-filter6.jpg\" class=\"size-full wp-image-6219 aligncenter\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg sizes=\"(max-width: 1946px) 100vw, 1946px\" srcset=\"https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/Anti-Halo-PRO-2-inch-Dual-Band-filter7.jpg 1946w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/Anti-Halo-PRO-2-inch-Dual-Band-filter7-300x147.jpg 300w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/Anti-Halo-PRO-2-inch-Dual-Band-filter7-1024x502.jpg 1024w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/Anti-Halo-PRO-2-inch-Dual-Band-filter7-768x377.jpg 768w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/Anti-Halo-PRO-2-inch-Dual-Band-filter7-1536x753.jpg 1536w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/Anti-Halo-PRO-2-inch-Dual-Band-filter7-600x294.jpg 600w\" height=\"755\" width=\"1540\" alt=\"\" src=\"http:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/Anti-Halo-PRO-2-inch-Dual-Band-filter7.jpg\" class=\"size-full wp-image-6220 aligncenter\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg sizes=\"(max-width: 1924px) 100vw, 1924px\" srcset=\"https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/Anti-Halo-PRO-2-inch-Dual-Band-filter9.png 1924w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/Anti-Halo-PRO-2-inch-Dual-Band-filter9-300x144.png 300w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/Anti-Halo-PRO-2-inch-Dual-Band-filter9-1024x490.png 1024w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/Anti-Halo-PRO-2-inch-Dual-Band-filter9-768x368.png 768w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/Anti-Halo-PRO-2-inch-Dual-Band-filter9-1536x735.png 1536w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/Anti-Halo-PRO-2-inch-Dual-Band-filter9-600x287.png 600w\" height=\"806\" width=\"1684\" alt=\"\" src=\"http:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/Anti-Halo-PRO-2-inch-Dual-Band-filter9.png\" class=\"aligncenter size-full wp-image-6277\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg sizes=\"(max-width: 2988px) 100vw, 2988px\" srcset=\"https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/Anti-Halo-PRO-2-inch-Dual-Band-filter-Curve-ZOOM3.png 2988w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/Anti-Halo-PRO-2-inch-Dual-Band-filter-Curve-ZOOM3-300x109.png 300w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/Anti-Halo-PRO-2-inch-Dual-Band-filter-Curve-ZOOM3-1024x372.png 1024w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/Anti-Halo-PRO-2-inch-Dual-Band-filter-Curve-ZOOM3-768x279.png 768w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/Anti-Halo-PRO-2-inch-Dual-Band-filter-Curve-ZOOM3-1536x558.png 1536w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/Anti-Halo-PRO-2-inch-Dual-Band-filter-Curve-ZOOM3-2048x744.png 2048w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/Anti-Halo-PRO-2-inch-Dual-Band-filter-Curve-ZOOM3-600x218.png 600w\" height=\"666\" width=\"1833\" alt=\"\" src=\"http:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/Anti-Halo-PRO-2-inch-Dual-Band-filter-Curve-ZOOM3.png\" class=\"alignnone size-full wp-image-6320\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp data-section=\"8\" class=\"tgt\"\u003e\u003cimg sizes=\"(max-width: 2477px) 100vw, 2477px\" srcset=\"https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/DB-HAOIII-2-5.jpg 2477w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/DB-HAOIII-2-5-300x255.jpg 300w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/DB-HAOIII-2-5-1024x871.jpg 1024w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/DB-HAOIII-2-5-768x653.jpg 768w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/DB-HAOIII-2-5-1536x1306.jpg 1536w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/DB-HAOIII-2-5-2048x1741.jpg 2048w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/DB-HAOIII-2-5-600x510.jpg 600w\" height=\"1335\" width=\"1570\" alt=\"\" src=\"http:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/DB-HAOIII-2-5.jpg\" class=\"alignnone size-full wp-image-6222\"\u003e\u003c\/p\u003e\n\u003ch3 data-section=\"8\"\u003e\u003cstrong\u003eVega testing of halo control\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eLuke use his 8″ F4 Newtonian and Canon 700D to test Anti-Halo Pro dual-band filter, the target is Vega (Zero magnitude star), exposure 120sec. We can see there is no halo around Vega, the off axis big halo is the reflection of the lens in coma corrector.\u003c\/p\u003e\n\u003ch3 data-section=\"8\"\u003e\u003cimg sizes=\"(max-width: 1500px) 100vw, 1500px\" srcset=\"https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/342968263_1005227124220133_2113089985259008154_n2.jpg 1500w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/342968263_1005227124220133_2113089985259008154_n2-300x200.jpg 300w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/342968263_1005227124220133_2113089985259008154_n2-1024x684.jpg 1024w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/342968263_1005227124220133_2113089985259008154_n2-768x513.jpg 768w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/342968263_1005227124220133_2113089985259008154_n2-600x401.jpg 600w\" height=\"496\" width=\"743\" alt=\"\" src=\"http:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/342968263_1005227124220133_2113089985259008154_n2.jpg\" class=\"size-full wp-image-6361 aligncenter\"\u003e\u003c\/h3\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3 data-section=\"8\"\u003e\u003cstrong\u003eUsers Work:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cimg sizes=\"(max-width: 2560px) 100vw, 2560px\" srcset=\"https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/ESPRIT120Anti-Halo-Pro-Dual-band-filter-Poseidon-C-scaled.jpg 2560w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/ESPRIT120Anti-Halo-Pro-Dual-band-filter-Poseidon-C-300x199.jpg 300w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/ESPRIT120Anti-Halo-Pro-Dual-band-filter-Poseidon-C-1024x679.jpg 1024w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/ESPRIT120Anti-Halo-Pro-Dual-band-filter-Poseidon-C-768x509.jpg 768w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/ESPRIT120Anti-Halo-Pro-Dual-band-filter-Poseidon-C-1536x1018.jpg 1536w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/ESPRIT120Anti-Halo-Pro-Dual-band-filter-Poseidon-C-2048x1357.jpg 2048w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/ESPRIT120Anti-Halo-Pro-Dual-band-filter-Poseidon-C-600x398.jpg 600w\" height=\"1315\" width=\"1983\" alt=\"\" src=\"http:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/ESPRIT120Anti-Halo-Pro-Dual-band-filter-Poseidon-C-scaled.jpg\" class=\"alignnone size-full wp-image-6224\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNGC7822\u003c\/strong\u003e, Luke Newbould, Esprit120APO+Anti-Halo Pro Ha+OIII filter + Poseidon-C Pro\u003c\/p\u003e\n\u003cp\u003e\u003cimg sizes=\"(max-width: 2560px) 100vw, 2560px\" srcset=\"https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/342684666_265696509131976_728422230206237110_n-scaled.jpg 2560w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/342684666_265696509131976_728422230206237110_n-300x207.jpg 300w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/342684666_265696509131976_728422230206237110_n-1024x705.jpg 1024w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/342684666_265696509131976_728422230206237110_n-768x529.jpg 768w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/342684666_265696509131976_728422230206237110_n-1536x1058.jpg 1536w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/342684666_265696509131976_728422230206237110_n-2048x1410.jpg 2048w, https:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/342684666_265696509131976_728422230206237110_n-600x413.jpg 600w\" height=\"1258\" width=\"1826\" alt=\"\" src=\"http:\/\/player-one-astronomy.com\/wp-content\/uploads\/2023\/04\/342684666_265696509131976_728422230206237110_n-scaled.jpg\" class=\"alignnone size-full wp-image-6354\"\u003e\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eNGC7000\u003c\/strong\u003e, Luke Newbould, Redcat 51APO+Anti-Halo Pro Ha+OIII filter + Canon 700D\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ch4\u003e\n\u003cstrong\u003eAnti-Halo PRO\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e\u003cstrong\u003eDual-Band\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e\u003cstrong\u003e2″\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e\u003cstrong\u003eHa+OIII filter\u003c\/strong\u003e\n\u003c\/h4\u003e\n\u003cp class=\"tgt\" data-section=\"2\"\u003e\u003cspan class=\"tgt\" data-section=\"2\" data-sentence=\"0\" data-group=\"2-0\"\u003e\u003cstrong\u003eFrame thickness:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ebody 5mm+ thread 2.5mm, a total of 7.5mm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"tgt\" data-section=\"4\"\u003e\u003cspan class=\"tgt\" data-section=\"4\" data-sentence=\"0\" data-group=\"4-0\"\u003e\u003cstrong\u003eFilter glass thickness:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e1.85mm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eHa CWL:\u003cspan\u003e \u003c\/span\u003e\u003c\/b\u003e656.3nm     \u003cspan\u003e \u003c\/span\u003e\u003cb\u003eBand\u003cspan\u003e \u003c\/span\u003e\u003c\/b\u003e\u003cb\u003eWidth:\u003cspan\u003e \u003c\/span\u003e\u003c\/b\u003e3.7±0.5nm\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eOIII CWL:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e500.7nm    \u003cspan\u003e \u003c\/span\u003e\u003cb\u003eBand Width:\u003cspan\u003e \u003c\/span\u003e\u003c\/b\u003e3.2±0.5nm\u003c\/p\u003e\n\u003cp class=\"tgt\" data-section=\"6\"\u003e\u003cspan class=\"tgt\" data-section=\"6\" data-sentence=\"0\" data-group=\"6-0\"\u003e\u003cstrong\u003eTransmittance:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e\u0026gt;=\u003c\/span\u003e\u003cspan class=\"tgt\" data-section=\"6\" data-sentence=\"1\" data-group=\"6-1\"\u003e85%\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"tgt\" data-section=\"8\"\u003e\u003cspan class=\"tgt\" data-section=\"8\" data-sentence=\"0\" data-group=\"8-0\"\u003e\u003cstrong\u003eBlocking depth:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e\u003c\/span\u003eOD5 (200-1100nm)\u003c\/p\u003e\n\u003cp class=\"tgt\" data-section=\"8\"\u003e \u003c\/p\u003e\n\u003ch3 class=\"tgt\" data-section=\"8\"\u003eIn the Box\u003c\/h3\u003e\n\u003cp\u003eAnti-Halo Filter\u003c\/p\u003e\n\u003cp\u003eFilter Case\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eManuals \u0026amp; Warranty\u003c\/h3\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/istronomyplus.com\/pages\/player-one-warranty\" target=\"_blank\"\u003ePlayer one 2-Year Warranty\u003c\/a\u003e\u003c\/p\u003e","brand":"Player One","offers":[{"title":"Default Title","offer_id":44461179633893,"sku":"PO-AHP-HO-2","price":699.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/player-one-anti-halo-pro-dual-band-2-ha-oiii-filter-astronomy-plus.png?v=1715808517"},{"product_id":"askar-colour-magic-c1-c2-duo-band-filter","title":"Askar Colour Magic C1 \u0026 C2 Duo-Band Filter","description":"\u003ch2\u003eAskar Colour Magic C1 \u0026amp; C2 Duo-Band Filter\u003c\/h2\u003e\n\u003cp\u003eColour Magic C1 Duo-band filter (Hα+OIII) has a high transmittance of over 90% at its center wavelength (500.7nm and 656.6nm). It can effectively improve the quality of the image by making the sky background of the image darker while maximizing the contrast throughout the image， enhancing the contrast of your pictures, and making it easier to display the details of the stars. In areas with very serious light pollution, this filter can also selectively filter light pollution and cluttered signals through the emission lights of the nebula to achieve the ideal shooting effect\u003c\/p\u003e\n\u003cp\u003eWhen shooting deep-sky galaxies with color cameras, a duo-band filter in the Hα +OⅢ bands is often used; whereas with a mono camera, a narrowband filter in the Hα, SⅡ, and OⅢ bands is often used, leaving users with color cameras missing one band of nebula detail. This can be compensated by using the Colour Magic C Duo-band filter (SⅡ+OIII) mentioned above.\u003c\/p\u003e\n\u003cp\u003eColour Magic C2 Duo-band filter (SII+OIII) has a high transmittance of over 90% at its center wavelength (500.7nm and 672nm). It can effectively improve the quality of the image by making the sky background of the image darker while maximizing the contrast throughout the image， enhancing the contrast of your pictures, and making it easier to display the details of the stars. In areas with very serious light pollution, this filter can also selectively filter light pollution and cluttered signals through the emission lights of the nebula to achieve the ideal shooting effect.\u003c\/p\u003e\n\u003cp\u003eUsing the Colour Magic 2” C duo-band filter package can effectively improve the contrast of the image, making it easier to bring out the detailed features of objects that would otherwise be difficult to capture. It'll be able to take high-quality deep-sky images even in areas affected by urban light pollution and other light sources.\u003c\/p\u003e\n\u003cp\u003eWe name the Hα+OⅢ Duo-band filter “C1”, and the SⅡ+OⅢ as “C2”, so their combination is the Colour Magic C 2\" Duo-band filter package. It enables color camera users to shoot without the mono camera and H\/S\/O narrowband filter, providing more fun of astrophotography.\u003c\/p\u003e\n\u003cp\u003eWith efficient and excellent imaging performance and, a fun and innovative shooting experience, let Colour Magic C duo-band filters become your great tool to capture the beautiful moments of the universe!\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eAskar C1 Duo-band Filter (OIII \u0026amp; Ha) 2”\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"ql-align-center\"\u003e\u003cstrong\u003eFWHM:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"ql-align-center\"\u003eOIII：35nm±5nm\/Ha：15nm±3nm\u003c\/p\u003e\n\u003cp class=\"ql-align-center\"\u003e\u003cstrong\u003eCWL:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"ql-align-center\"\u003e500.7nm \u0026amp; 656.6nm\u003c\/p\u003e\n\u003cp class=\"ql-align-center\"\u003e\u003cstrong\u003ePeak transmittance:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"ql-align-center\"\u003e90%\u003c\/p\u003e\n\u003cp class=\"ql-align-center\"\u003e\u003cstrong\u003eThickness:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"ql-align-center\"\u003e2 ± 0.05mm\u003c\/p\u003e\n\u003cp class=\"ql-align-center\"\u003e\u003cstrong\u003eBarrier property:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"ql-align-center\"\u003eOD3 @ 200-1000nm\u003c\/p\u003e\n\u003cp class=\"ql-align-center\"\u003e\u003cstrong\u003eSurface finish:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"ql-align-center\"\u003e60\/40\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAskar C2 Duo-band Filter (OIII \u0026amp; SⅡ) 2”\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"ql-align-center\"\u003e\u003cstrong\u003eFWHM:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"ql-align-center\"\u003eOIII：35nm±5nm\/SⅡ：15nm±3nm\u003c\/p\u003e\n\u003cp class=\"ql-align-center\"\u003e\u003cstrong\u003eCWL:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"ql-align-center\"\u003e500.7nm \u0026amp; 672nm\u003c\/p\u003e\n\u003cp class=\"ql-align-center\"\u003e\u003cstrong\u003ePeak transmittance:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"ql-align-center\"\u003e90%\u003c\/p\u003e\n\u003cp class=\"ql-align-center\"\u003e\u003cstrong\u003eThickness:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"ql-align-center\"\u003e2 ± 0.05mm\u003c\/p\u003e\n\u003cp class=\"ql-align-center\"\u003e\u003cstrong\u003eBarrier property:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"ql-align-center\"\u003eOD3 @ 200-1000nm\u003c\/p\u003e\n\u003cp class=\"ql-align-center\"\u003e\u003cstrong\u003eSurface finish:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"ql-align-center\"\u003e60\/40\u003c\/p\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFilter \/ Filters\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWarranty \u0026amp; Manuals\u003c\/h3\u003e\n\u003cp\u003eAskar Warranty\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Askar","offers":[{"title":"Colour Magic C1 Duo-band Filter (Hα+OIII)","offer_id":44497849254117,"sku":"ASK-CM-C1","price":166.0,"currency_code":"CAD","in_stock":true},{"title":"Colour Magic C2 Duo-band Filter (SII+OIII)","offer_id":44497849286885,"sku":"ASK-CM-C2","price":166.0,"currency_code":"CAD","in_stock":true},{"title":"Colour Magic C 2\" Duo-band Filter Package","offer_id":44497849319653,"sku":"ASK-CM-C1+C2","price":315.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/askar-colour-magic-c1c2-duo-band-filter-astronomy-plus-1.webp?v=1715808465"},{"product_id":"idas-lps-p2-31mm-pollution-filter-lps-p2-31","title":"IDAS LPS-P2 31mm pollution filter (LPS-P2-31)","description":"\u003ch1\u003eIDAS LPS-P2 unmounted 31mm pollution filter \u003c\/h1\u003e\n\u003ch2\u003eNew, but \u003cspan style=\"text-decoration: underline; color: rgb(239, 18, 18);\"\u003ediscontinued.\u003c\/span\u003e\n\u003c\/h2\u003e\n\u003ch2 data-mce-fragment=\"1\"\u003eDescription\u003c\/h2\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eLight pollution suppression (LPS) filters are designed to suppress the common emission lines generated by artificial lighting, yet allow the important nebula emission lines to pass, thus enhancing the contrast of astronomical objects, particularly emission nebulae.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eUnlike other light pollution suppression filters, IDAS filters are specifically designed for balanced color transmission using the IDAS unique \u003cb data-mce-fragment=\"1\"\u003eMulti-Bandpass Technology\u003c\/b\u003e (MBT) process. The balanced transmission allows color photographs to be taken with minimal color cast to broadband emission objects such as stars, galaxies and globular clusters. The comparison photos at right demonstrate (qualitatively) that the IDAS filter maintains better color balance than other filters which have been designed for visual use.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eLPS filters utilize the unique IDAS Ion Gun Assisted Deposition (IGAD*) coating technology for superior coating durability (quartz hardness) and safer cleaning. IGAD coatings also improve temperature and humidity stability of the filter performance, reducing spectrum shifts down to +\/-1nm from the +\/-3 or 4nm shift of standard coatings.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eCCD imaging can also benefit, because although CCD imagers can already shoot through light pollution to some extent, including an LPS filter to the setup gives an added (signal-to-noise) edge.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eNote, however, that light pollution suppression filters are \u003c\/span\u003e\u003cspan data-mce-fragment=\"1\"\u003enot\u003c\/span\u003e\u003cspan data-mce-fragment=\"1\"\u003e a perfect substitute for dark skies. Refer to Hutech's discussion of the \u003c\/span\u003e\u003ca href=\"http:\/\/www.sciencecenter.net\/hutech\/idas\/lps2.htm\" aria-describedby=\"a11y-external-message\" data-mce-fragment=\"1\" data-mce-href=\"http:\/\/www.sciencecenter.net\/hutech\/idas\/lps2.htm\"\u003elimitations and common misconceptions\u003c\/a\u003e\u003cspan data-mce-fragment=\"1\"\u003e about light pollution suppression filters.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eLPS filters are available for 1-1\/4\" and 2\" (48mm) eyepieces, as well as in numerous sizes to accomodate most popular camera lenses. Each filter lot is tested and a plot of the spectral response of the lot is provided with each filter. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0869\/6486\/files\/tokai1_large.gif?10873360616383643319\" alt=\"\" data-mce-fragment=\"1\" data-mce-src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0869\/6486\/files\/tokai1_large.gif?10873360616383643319\"\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e[Above] Spectral response (% transmission vs. wavelength in nanometers) of the IDAS Light Pollution Suppression filter. Major emission lines generated by artificial lighting are also indicated. Note that this plot represents the spec target for LPS filters. The spectral response of each individual filter will vary. This is measured, plotted, and shipped with each filter produced:\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0869\/6486\/files\/idas-p2_1024x1024.gif?7115251255644343845\" alt=\"\" data-mce-fragment=\"1\" data-mce-src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0869\/6486\/files\/idas-p2_1024x1024.gif?7115251255644343845\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eAbove is a sample of the filter lot data plot which is shipped with each filter.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eThe IDAS production criteria for filters are as follows, arranged from left to right (short to long wavelength) as plotted above:\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv class=\"scrollable-wrapper\" data-mce-fragment=\"1\"\u003e\n\u003cdiv class=\"table-wrapper\"\u003e\n\u003ctable data-mce-fragment=\"1\"\u003e\n\u003ctbody data-mce-fragment=\"1\"\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003e\u003cspan size=\"2\" face=\"Arial, Geneva\" data-mce-fragment=\"1\"\u003eWavelength (nm)\u003c\/span\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003e\u003cspan size=\"2\" face=\"Arial, Geneva\" data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003ePass\/Block\u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003e\u003cspan size=\"2\" face=\"Arial, Geneva\" data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eTransmission\u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\u003cspan size=\"2\" face=\"Arial, Geneva\" data-mce-fragment=\"1\"\u003e365\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\u003cspan size=\"2\" face=\"Arial, Geneva\" data-mce-fragment=\"1\"\u003eBlock\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\u003cspan size=\"2\" face=\"Arial, Geneva\" data-mce-fragment=\"1\"\u003e6.5% max\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\u003cspan size=\"2\" face=\"Arial, Geneva\" data-mce-fragment=\"1\"\u003e405\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\u003cspan size=\"2\" face=\"Arial, Geneva\" data-mce-fragment=\"1\"\u003eBlock\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\u003cspan size=\"2\" face=\"Arial, Geneva\" data-mce-fragment=\"1\"\u003e6.5% max\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\u003cspan size=\"2\" face=\"Arial, Geneva\" data-mce-fragment=\"1\"\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\u003cspan size=\"2\" face=\"Arial, Geneva\" data-mce-fragment=\"1\"\u003ePass\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\u003cspan size=\"2\" face=\"Arial, Geneva\" data-mce-fragment=\"1\"\u003e60% min (avg)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\u003cspan size=\"2\" face=\"Arial, Geneva\" data-mce-fragment=\"1\"\u003e436\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\u003cspan size=\"2\" face=\"Arial, Geneva\" data-mce-fragment=\"1\"\u003eBlock\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\u003cspan size=\"2\" face=\"Arial, Geneva\" data-mce-fragment=\"1\"\u003e6.5% max\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\u003cspan size=\"2\" face=\"Arial, Geneva\" data-mce-fragment=\"1\"\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\u003cspan size=\"2\" face=\"Arial, Geneva\" data-mce-fragment=\"1\"\u003ePass\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\u003cspan size=\"2\" face=\"Arial, Geneva\" data-mce-fragment=\"1\"\u003e92% min (avg)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\u003cspan size=\"2\" face=\"Arial, Geneva\" data-mce-fragment=\"1\"\u003e546\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\u003cspan size=\"2\" face=\"Arial, Geneva\" data-mce-fragment=\"1\"\u003eBlock\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\u003cspan size=\"2\" face=\"Arial, Geneva\" data-mce-fragment=\"1\"\u003e6.5% max\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\u003cspan size=\"2\" face=\"Arial, Geneva\" data-mce-fragment=\"1\"\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\u003cspan size=\"2\" face=\"Arial, Geneva\" data-mce-fragment=\"1\"\u003ePass\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\u003cspan size=\"2\" face=\"Arial, Geneva\" data-mce-fragment=\"1\"\u003e75% min (avg)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\u003cspan size=\"2\" face=\"Arial, Geneva\" data-mce-fragment=\"1\"\u003e590\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\u003cspan size=\"2\" face=\"Arial, Geneva\" data-mce-fragment=\"1\"\u003eBlock\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\u003cspan size=\"2\" face=\"Arial, Geneva\" data-mce-fragment=\"1\"\u003e6.5% max\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\u003cspan size=\"2\" face=\"Arial, Geneva\" data-mce-fragment=\"1\"\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\u003cspan size=\"2\" face=\"Arial, Geneva\" data-mce-fragment=\"1\"\u003ePass\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\u003cspan size=\"2\" face=\"Arial, Geneva\" data-mce-fragment=\"1\"\u003e75% min (avg)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\u003cspan size=\"2\" face=\"Arial, Geneva\" data-mce-fragment=\"1\"\u003e623\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\u003cspan size=\"2\" face=\"Arial, Geneva\" data-mce-fragment=\"1\"\u003eBlock\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\u003cspan size=\"2\" face=\"Arial, Geneva\" data-mce-fragment=\"1\"\u003e25% max\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\u003cspan size=\"2\" face=\"Arial, Geneva\" data-mce-fragment=\"1\"\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\u003cspan size=\"2\" face=\"Arial, Geneva\" data-mce-fragment=\"1\"\u003ePass\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e\u003cspan size=\"2\" face=\"Arial, Geneva\" data-mce-fragment=\"1\"\u003e80% min (avg)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0869\/6486\/files\/tokai2_large.gif?10873360616383643319\" alt=\"\" data-mce-fragment=\"1\" data-mce-src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0869\/6486\/files\/tokai2_large.gif?10873360616383643319\"\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e[Above] Off-axis spectral response (% transmission vs. wavelength in nanometers) of the IDAS filter.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e \u003c\/p\u003e","brand":"IDAS","offers":[{"title":"Default Title","offer_id":45465767411941,"sku":"IDA-LPS-P2-31mm","price":20.0,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/idas-lps-p2-31mm-pollution-filter-lps-p2-31-astronomy-plus.webp?v=1715808115"},{"product_id":"antlia-alp-t-dualband-3nm-oiii-h-a-filter-for-f-4-slower-2-mounted-alp-t-2-haoiii-3nm","title":"Antlia ALP-T Dual Band Ha \u0026 OIII 3nm 2\" Filter","description":"\u003ch1\u003eAntlia ALP-T Dualband 3nm Ha + OIII 2'' Filters\u003c\/h1\u003e\n\u003cp\u003eThe Antlia ALP-T Dualband 3nm Ha\u0026amp;OIII Filter is a dual narrowband filter, which lets the red H-alpha (656.3nm) and the blue-green OIII (500.7nm) lines through and is primarily engineered for color cameras to assist astrophotographers taking deep sky images with superior SNR (Signal to Noise Ratio). With an FWHM half-bandwidth designed at 3nm and achieving an optical density (OD) of 4.5 on unwanted wavelengths, it works strongly in blocking light pollution, moonlight, and airglow, leading to enhanced contrast in nebulae images by effectively passing the Ha and OIII emission lines signal only.\u003c\/p\u003e\n\u003cp\u003eThe combination of these two dual band Ha\u0026amp;OIII and SII\u0026amp;H-beta filters allows extreme narrow-band images with OSC cameras by capturing the spectral data from 4 channels i.e. Ha\/OIII\/SII\/Hb. The spectrum of these four channels can be separated and recombined into various color palettes in your post-processing. The resulting images can be used for luminance contrast enhancement of traditional RGB-balanced images or the creation of images in various popular false-color palettes such as H-O-Hb, S-H-O, H-S-OHb, H-O-O, etc.\u003c\/p\u003e\n\u003cp\u003eThe advanced multi-coatings on Antlia ALP-T dual-band filters effectively isolate the red, Ha line, blue-green, OIII line, deep red SII, and the blue H-beta lines from emission nebulae, with almost total suppression of optical density (OD)4.5 on unwanted wavelengths from light pollution, moonlight, and airglow. The result is that both the ALP-T dual band Ha\u0026amp;OIII version and SII\u0026amp;Hb version create a superior signal-to-noise ratio and better contrast in your OSC images whether used in urban or rural areas, making them excellent choices for astrophotographers aiming to capture high-quality and more detailed celestial images.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMain features and application:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePasses OIII 500.7nm and H-alpha 656.3nm lines\u003c\/li\u003e\n\u003cli\u003eCapturing of the two main emission wavebands in the red and blue-green at the same time\u003c\/li\u003e\n\u003cli\u003eUltra FWHM 3nm design allows for increasing exposure time and capturing detailed nebulae signal\u003c\/li\u003e\n\u003cli\u003eDesigned to be used primarily with color cameras to capture cleaner data or used as Luminance filter mono cameras to save imaging time\u003c\/li\u003e\n\u003cli\u003eRecommended to be used with ALP-T Dual Band SII\u0026amp;Hb filter to create images with better\u003c\/li\u003e\n\u003cli\u003eSNR( signal-to-noise) and better isolation between the 4 channels\u003c\/li\u003e\n\u003cli\u003eSuppression of optical density (OD)4.5 on unwanted wavelengths adds signal-to-noise\u003c\/li\u003e\n\u003cli\u003eNear IR (NIR) is blocked up to 1100nm\u003c\/li\u003e\n\u003cli\u003eIdeal flat-top and moderate bandpass reducing spectrum downshifts\u003c\/li\u003e\n\u003cli\u003eRecommended to use the filter with optics f-ratios slower than f\/4 for best performance, for optics faster than f\/4, pre-shifted highspeed version is a better choice\u003c\/li\u003e\n\u003cli\u003eIon Gun Assisted Deposition of double-sided multi-layer coating technology on the double-sided polished substrate making it the most consistent and accurate light pollution suppression filter\u003c\/li\u003e\n\u003cli\u003eHalo suppression anti-reflective coating is used to minimize halo and internal reflections\u003c\/li\u003e\n\u003cli\u003eDesigned to suppress artificial lighting from Bortle scale 1 to Bortle scale 8\u003c\/li\u003e\n\u003cli\u003eBlackened edges of unmounted sizes to minimize internal reflections\u003c\/li\u003e\n\u003cli\u003eAntlia's ever-trusted coating technology makes its durability very reliable\u003c\/li\u003e\n\u003cli\u003eWhile primarily designed for use with color cameras, the filter is also highly effective with monochrome cameras to save imaging time\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical Data:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFWHM: 3nm +0.6\/-0.1nm\u003c\/li\u003e\n\u003cli\u003eCWL (Central Wavelength):\n\u003cul\u003e\n\u003cli\u003eHydrogen-alpha: 656.3nm\u003c\/li\u003e\n\u003cli\u003eOxygen III: 500.7nm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003ePeak Transmission:\n\u003cul\u003e\n\u003cli\u003eHydrogen-alpha: 90%\u003c\/li\u003e\n\u003cli\u003eOxygen III: 82%\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003eBlocking: ≥OD4.5 @ 300-1100nm\u003c\/li\u003e\n\u003cli\u003eFilter Thickness: 2mm+\/-0.05mm\u003c\/li\u003e\n\u003cli\u003eBasic Substrate Optical, Single \/ Non-glued substrate\u003c\/li\u003e\n\u003cli\u003eSurface Quality S\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/li\u003e\n\u003cli\u003eTransmitted Wavefront Lambda\/4 or better. Parallelism less than 30 arcsec\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eFilter Ring:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e2’’ Mounted (M48*0.75 thread)\u003c\/li\u003e\n\u003cli\u003eUltra-thin filter cell to minimize vignetting by maximizing possible clear aperture\u003c\/li\u003e\n\u003cli\u003eBlack Anodized Finish\u003c\/li\u003e\n\u003cli\u003eLaser Engraving, No Fading\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot Recommended:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSolar Observing and imaging\u003c\/li\u003e\n\u003cli\u003eNight visual observation\u003c\/li\u003e\n\u003cli\u003eDO NOT LOOK AT THE SUN WITH ANTLIA FILTERS. Serious eye damage will result if you fail to observe the warning.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003cstrong\u003eNot Permitted:\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eDO NOT LOOK AT THE SUN WITH THIS FILTER DIRECTLY\u003c\/strong\u003e\u003cbr\u003eSerious eye damage will result if you fail to observe the warning.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eAntlia ALP-T Dualband 3nm Ha\u0026amp;OIII Filter \u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable cellspacing=\"0\" border=\"0\"\u003e\n\u003ccolgroup width=\"187\"\u003e\u003c\/colgroup\u003e \u003ccolgroup width=\"152\"\u003e\u003c\/colgroup\u003e \u003ccolgroup width=\"144\"\u003e\u003c\/colgroup\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"\"}'\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"Hydrogen-alpha\"}'\u003eHydrogen-alpha\u003c\/td\u003e\n\u003ctd align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"Oxygen III\"}'\u003eOxygen III\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"FWHM\"}'\u003eFWHM\u003c\/td\u003e\n\u003ctd align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"3nm +0.6\\\/-0.1nm \"}'\u003e\u003cspan style=\"font-family: Liberation Serif;\" data-mce-style=\"font-family: Liberation Serif;\"\u003e3nm +0.6\/-0.1nm \u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"3nm +0.6\\\/-0.1nm \"}'\u003e\u003cspan style=\"font-family: Liberation Serif;\" data-mce-style=\"font-family: Liberation Serif;\"\u003e3nm +0.6\/-0.1nm \u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"CWL\"}'\u003eCWL\u003c\/td\u003e\n\u003ctd align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"656.3nm \"}'\u003e\u003cspan style=\"font-family: Liberation Serif;\" data-mce-style=\"font-family: Liberation Serif;\"\u003e656.3nm \u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"500.7nm \"}'\u003e\u003cspan style=\"font-family: Liberation Serif;\" data-mce-style=\"font-family: Liberation Serif;\"\u003e500.7nm \u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"Peak transmission\"}'\u003ePeak transmission\u003c\/td\u003e\n\u003ctd align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 3, \"3\": 0}' data-sheets-numberformat='{ \"1\": 2, \"2\": \"0.00%\", \"3\": 1}' sdval=\"0.9\" sdnum=\"1033;0;0.00%\"\u003e90.00%\u003c\/td\u003e\n\u003ctd align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 3, \"3\": 0}' data-sheets-numberformat='{ \"1\": 2, \"2\": \"0.00%\", \"3\": 1}' sdval=\"0.9\" sdnum=\"1033;0;0.00%\"\u003e90.00%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"Blocking\"}'\u003eBlocking\u003c\/td\u003e\n\u003ctd colspan=\"2\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"≥OD4.5 @ 300-1100nm \"}'\u003e\u003cspan style=\"font-family: Liberation Serif;\" data-mce-style=\"font-family: Liberation Serif;\"\u003e≥OD4.5 @ 300-1100nm \u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"Filter thickness\"}'\u003eFilter thickness\u003c\/td\u003e\n\u003ctd colspan=\"2\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"2mm+\\\/-0.05mm \"}'\u003e\u003cspan style=\"font-family: Liberation Serif;\" data-mce-style=\"font-family: Liberation Serif;\"\u003e2mm+\/-0.05mm \u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"Basic Substrate\"}'\u003eBasic Substrate\u003c\/td\u003e\n\u003ctd colspan=\"2\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"Optical, Single \\\/ Non-glued substrate \"}'\u003e\u003cspan style=\"font-family: Liberation Serif;\" data-mce-style=\"font-family: Liberation Serif;\"\u003eOptical, Single \/ Non-glued substrate \u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"40\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"Surface Quality\"}'\u003eSurface Quality\u003c\/td\u003e\n\u003ctd colspan=\"2\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"S\\\/D (scratch\\\/dig)= 60\\\/40 (Refer to MIL-O- \"}'\u003e\u003cspan style=\"font-family: Liberation Serif;\" data-mce-style=\"font-family: Liberation Serif;\"\u003eS\/D (scratch\/dig)= 60\/40 (Refer to MIL-O- \u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"Transmitted Wavefront\"}'\u003eTransmitted Wavefront\u003c\/td\u003e\n\u003ctd colspan=\"2\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"Lambda\\\/4 or better. \"}'\u003e\u003cspan style=\"font-family: Liberation Serif;\" data-mce-style=\"font-family: Liberation Serif;\"\u003eLambda\/4 or better. \u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"Parallelism\"}'\u003eParallelism\u003c\/td\u003e\n\u003ctd colspan=\"2\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"less than 30 arcsec \"}'\u003e\u003cspan style=\"font-family: Liberation Serif;\" data-mce-style=\"font-family: Liberation Serif;\"\u003eless than 30 arcsec \u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"Filter Ring\"}'\u003eFilter Ring\u003c\/td\u003e\n\u003ctd colspan=\"2\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"2’’ (M48*0.75) \"}'\u003e\u003cspan style=\"font-family: Liberation Serif;\" data-mce-style=\"font-family: Liberation Serif;\"\u003e2’’ (M48*0.75) \u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp class=\"western\" align=\"left\"\u003e\u003cspan style=\"font-family: Arial, sans-serif;\" data-mce-style=\"font-family: Arial, sans-serif;\"\u003e\u003cspan style=\"font-size: small;\" data-mce-style=\"font-size: small;\"\u003e\u003cspan lang=\"en-US\"\u003e\u003cb\u003eAntlia ALP-T dualband 3.5nm SII\u0026amp;H-beta Filter\u003c\/b\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ctable border=\"0\" cellspacing=\"0\"\u003e\n\u003ccolgroup width=\"241\"\u003e\u003c\/colgroup\u003e \u003ccolgroup width=\"214\"\u003e\u003c\/colgroup\u003e \u003ccolgroup width=\"235\"\u003e\u003c\/colgroup\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"\"}' align=\"left\" height=\"21\"\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"Sulfur-II\"}' align=\"center\"\u003e\u003cb\u003e\u003cspan style=\"color: #4d4d4d; font-family: Arial;\" data-mce-style=\"color: #4d4d4d; font-family: Arial;\"\u003eSulfur-II\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"Hydrogen-Beta\"}' align=\"center\"\u003e\u003cb\u003e\u003cspan style=\"color: #4d4d4d; font-family: Arial;\" data-mce-style=\"color: #4d4d4d; font-family: Arial;\"\u003eHydrogen-Beta\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"FWHM\"}' align=\"left\" height=\"21\"\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eFWHM\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"3.5nm +0.5\\\/-0.5nm\"}' align=\"center\"\u003e\u003cspan style=\"color: #000000; font-family: Arial;\" data-mce-style=\"color: #000000; font-family: Arial;\"\u003e3.5nm +0.5\/-0.5nm\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"3.5nm +0.5\\\/-0.5nm\"}' align=\"center\"\u003e\u003cspan style=\"color: #000000; font-family: Arial;\" data-mce-style=\"color: #000000; font-family: Arial;\"\u003e3.5nm +0.5\/-0.5nm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"CWL (Central Wavelength)\"}' align=\"left\" height=\"21\"\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eCWL (Central Wavelength)\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"672.4nm\"}' align=\"center\"\u003e\u003cspan style=\"color: #000000; font-family: Arial;\" data-mce-style=\"color: #000000; font-family: Arial;\"\u003e672.4nm\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"486.1nm\"}' align=\"center\"\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003e486.1nm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"Peak Transmission\"}' align=\"left\" height=\"21\"\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003ePeak Transmission\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd data-sheets-numberformat='{ \"1\": 2, \"2\": \"0.00%\", \"3\": 1}' data-sheets-value='{ \"1\": 3, \"3\": 0}' align=\"center\" sdnum=\"1033;0;0.00%\" sdval=\"0.9\"\u003e\u003cspan style=\"color: #000000; font-family: Arial;\" data-mce-style=\"color: #000000; font-family: Arial;\"\u003e90.00%\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd data-sheets-numberformat='{ \"1\": 2, \"2\": \"0.00%\", \"3\": 1}' data-sheets-value='{ \"1\": 3, \"3\": 0}' align=\"center\" sdnum=\"1033;0;0.00%\" sdval=\"0.85\"\u003e\u003cspan style=\"color: #000000; font-family: Arial;\" data-mce-style=\"color: #000000; font-family: Arial;\"\u003e85.00%\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"Blocking\"}' align=\"left\" height=\"21\"\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eBlocking\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"≥OD4.5 @ 300-1100nm\"}' align=\"center\" colspan=\"2\"\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003e≥OD4.5 @ 300-1100nm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"Filter Thickness\"}' align=\"left\" height=\"21\"\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eFilter Thickness\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"2mm+\\\/-0.05mm\"}' align=\"center\" colspan=\"2\"\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003e2mm+\/-0.05mm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"Basic Substrate\"}' align=\"left\" height=\"21\"\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eBasic Substrate\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \" Optical, Single \\\/ Non-glued substrate\"}' align=\"center\" colspan=\"2\"\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003e Optical, Single \/ Non-glued substrate\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"Surface Quality\"}' align=\"left\" height=\"21\"\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eSurface Quality\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"S\\\/D (scratch\\\/dig)= 60\\\/40 (Refer to MIL-O-13830\"}' align=\"center\" colspan=\"2\"\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eS\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"Transmitted Wavefront\"}' align=\"left\" height=\"21\"\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eTransmitted Wavefront\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"Lambda\\\/4 or better.\"}' align=\"center\" colspan=\"2\"\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eLambda\/4 or better.\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"Parallelism\"}' align=\"left\" height=\"21\"\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eParallelism\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"less than 30 arcsec\"}' align=\"center\" colspan=\"2\"\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eless than 30 arcsec\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"Filter Ring\"}' align=\"left\" height=\"21\"\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eFilter Ring\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"2’’ (M48*0.75)\"}' align=\"center\" colspan=\"2\"\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003e2’’ (M48*0.75)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eFilter Ring:\u003cbr\u003e2’’ (M48*0.75)\u003cbr\u003eUltra-thin filter cell to minimize vignetting by maximize possible clear aperture\u003cbr\u003eBlack Anodized Finish\u003cbr\u003eLaser Engraving No Fading\u003c\/p\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAntlia ALP-T Dualband 3nm Ha\u0026amp;OIII Filter 2''\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWarranty \u0026amp; Manual\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eAntlia 3-Years Warranty against Delamination\u003c\/span\u003e\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":46118944866533,"sku":"AF-ALP-T-2-HaOIII-3nm","price":533.8,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/alp-t-2-haoiii-3nm-2.jpg?v=1777043671"},{"product_id":"antlia-alp-t-sii-hb-3-5nm-duo-band-2-filter","title":"Antlia ALP-T Dual Band SII \u0026 Hb 3.5nm 2\" Filter","description":"\u003ch1\u003eAntlia ALP-T Dual band 3.5nm SII\u0026amp;Hb 2'' Filter\u003c\/h1\u003e\n\u003ch4\u003eProduct Details\u003c\/h4\u003e\n\u003cdiv class=\"value\"\u003e\n\u003cdiv class=\"product attribute description\"\u003e\n\u003cdiv class=\"value\"\u003e\n\u003cdiv data-content-type=\"row\" data-appearance=\"contained\" data-element=\"main\"\u003e\n\u003cdiv data-enable-parallax=\"0\" data-parallax-speed=\"0.5\" data-background-images=\"{}\" data-background-type=\"image\" data-video-loop=\"true\" data-video-play-only-visible=\"true\" data-video-lazy-load=\"true\" data-video-fallback-src=\"\" data-element=\"inner\" data-pb-style=\"IISSWKQ\"\u003e\n\u003cdiv data-content-type=\"text\" data-appearance=\"default\" data-element=\"main\"\u003e\n\u003cp\u003eThe ALP-T dual band 3.5nm SII\u0026amp;Hb filter is a dual narrowband filter, which lets the deep red Sulfur-II 672.4nm and the blue Hydrogen-Beta 486.1nm lines through and is primarily engineered for color cameras to assist astrophotographers taking deep sky images with superior SNR (Signal to Noise Ratio). With an FWHM half-bandwidth designed at 3.5nm and achieving an optical density (OD) of 4.5 on unwanted wavelengths, it works strongly in blocking light pollution, moonlight, and airglow, leading to enhanced contrast in nebulae images by effectively passing the SII and H-beta emission lines signal only.\u003c\/p\u003e\n\u003cp\u003eIt is a significant addition to the popular Antlia ALP-T dual-band Ha\u0026amp;OIII filter and enables false-color images and narrow-band nebula images using OSC. When capturing data with this filter, the nebulae are recorded with high signal-to-noise ratios and greater contrast than without it.\u003c\/p\u003e\n\u003cp\u003eThe combination of these two dual band Ha\u0026amp;OIII and SII\u0026amp;H-beta filters allows extreme narrow-band images with OSC cameras by capturing the spectral data from 4 channels i.e. Ha\/OIII\/SII\/Hb. The spectrum of these four channels can be separated and recombined into various color palettes in your post-processing. The resulting images can be used for luminance contrast enhancement of traditional RGB-balanced images or the creation of images in various popular false-color palettes such as H-O-Hb, S-H-O, H-S-OHb, H-O-O, etc.\u003c\/p\u003e\n\u003cp\u003eThe advanced multi-coatings on Antlia ALP-T dual-band filters effectively isolate the red, Ha line, blue-green, OIII line, deep red SII, and the blue H-beta lines from emission nebulae, with almost total suppression of optical density (OD)4.5 on unwanted wavelengths from light pollution, moonlight, and airglow. The result is that both the ALP-T dual band Ha\u0026amp;OIII version and SII\u0026amp;Hb version create a superior signal-to-noise ratio and better contrast in your OSC images whether used in urban or rural areas, making them excellent choices for astrophotographers aiming to capture high-quality and more detailed celestial images.\/p\u0026gt;\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMain features and application:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePasses SII 672.4nm and H-Beta 486.1nm lines\u003c\/li\u003e\n\u003cli\u003eCapturing of the two main emission wavebands in the deep red and blue at the same time\u003c\/li\u003e\n\u003cli\u003eUltra FWHM 3.5nm design allows for increasing exposure time and capturing detailed nebulae signal\u003c\/li\u003e\n\u003cli\u003eDesigned to be used primarily with color cameras to capture cleaner data or used as Luminance filter mono cameras to save imaging time\u003c\/li\u003e\n\u003cli\u003eRecommended to be used with ALP-T Dual Band Ha\u0026amp;OIII filter to create images with better\u003c\/li\u003e\n\u003cli\u003eSNR( signal-to-noise) and better isolation between the 4 channels\u003c\/li\u003e\n\u003cli\u003eSuppression of optical density (OD)4.5 on unwanted wavelengths improves SNR( signal-to-noise)\u003c\/li\u003e\n\u003cli\u003eNear IR (NIR) is blocked up to 1100nm\u003c\/li\u003e\n\u003cli\u003eIdeal flat-top and moderate bandpass reducing spectrum downshifts\u003c\/li\u003e\n\u003cli\u003eRecommended to use the filter with optics f-ratios slower than f\/4 for best performance, for optics faster than f\/4, pre-shifted highspeed version is a better choice\u003c\/li\u003e\n\u003cli\u003eIon Gun Assisted Deposition of double-sided multi-layer coating technology on the double-sided polished substrate making it the most consistent and accurate light pollution suppression filter\u003c\/li\u003e\n\u003cli\u003eHalo suppression anti-reflective coating is used to minimize halo and internal reflections\u003c\/li\u003e\n\u003cli\u003eDesigned to suppress artificial lighting from Bortle scale 1 to Bortle scale 8\u003c\/li\u003e\n\u003cli\u003eBlackened edges of unmounted sizes to minimize internal reflections\u003c\/li\u003e\n\u003cli\u003eAntlia's ever-trusted coating technology makes filter durability very reliable\u003c\/li\u003e\n\u003cli\u003eWhile primarily designed for use with color cameras, the filter is also highly effective with monochrome cameras to save imaging time\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical Data:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFWHM: 3.5nm +0.5\/-0.5nm\u003c\/li\u003e\n\u003cli\u003eCWL (Central Wavelength):\n\u003cul\u003e\n\u003cli\u003eSulfur-II: 672.4nm\u003c\/li\u003e\n\u003cli\u003eHydrogen-Beta: 486.1nm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003ePeak Transmission:\n\u003cul\u003e\n\u003cli\u003eSulfur-II: 90%\u003c\/li\u003e\n\u003cli\u003eHydrogen-Beta: 85%\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003eBlocking: ≥OD4.5 @ 300-1100nm\u003c\/li\u003e\n\u003cli\u003eFilter Thickness: 2mm+\/-0.05mm\u003c\/li\u003e\n\u003cli\u003eBasic Substrate Optical, Single \/ Non-glued substrate\u003c\/li\u003e\n\u003cli\u003eSurface Quality S\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/li\u003e\n\u003cli\u003eTransmitted Wavefront Lambda\/4 or better. Parallelism less than 30 arcsec\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eFilter Ring:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e2’’ Mounted (M48*0.75 thread)\u003c\/li\u003e\n\u003cli\u003eUltra-thin filter cell to minimize vignetting by maximizing possible clear aperture\u003c\/li\u003e\n\u003cli\u003eBlack Anodized Finish\u003c\/li\u003e\n\u003cli\u003eLaser Engraving, No Fading\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot Recommended:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSolar Observing and imaging\u003c\/li\u003e\n\u003cli\u003eNight visual observation\u003c\/li\u003e\n\u003cli\u003eDO NOT LOOK AT THE SUN WITH ANTLIA FILTERS. Serious eye damage will result if you fail to observe the warning.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3\u003eTechnical Specifications\u003cstrong\u003e\u003c\/strong\u003e\n\u003c\/h3\u003e\n\u003cp align=\"left\" class=\"western\"\u003e\u003cspan style=\"font-family: Arial, sans-serif;\" data-mce-style=\"font-family: Arial, sans-serif;\"\u003e\u003cspan style=\"font-size: small;\" data-mce-style=\"font-size: small;\"\u003e\u003cspan lang=\"en-US\"\u003e\u003cb\u003eAntlia ALP-T dualband 3.5nm SII\u0026amp;H-beta Filter\u003c\/b\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ctable cellspacing=\"0\" border=\"0\"\u003e\n\u003ccolgroup width=\"241\"\u003e\u003c\/colgroup\u003e \u003ccolgroup width=\"214\"\u003e\u003c\/colgroup\u003e \u003ccolgroup width=\"235\"\u003e\u003c\/colgroup\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"\"}'\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" data-sheets-value='{ \"1\": 2, \"2\": \"Sulfur-II\"}'\u003e\u003cb\u003e\u003cspan style=\"color: #4d4d4d; font-family: Arial;\" data-mce-style=\"color: #4d4d4d; font-family: Arial;\"\u003eSulfur-II\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" data-sheets-value='{ \"1\": 2, \"2\": \"Hydrogen-Beta\"}'\u003e\u003cb\u003e\u003cspan style=\"color: #4d4d4d; font-family: Arial;\" data-mce-style=\"color: #4d4d4d; font-family: Arial;\"\u003eHydrogen-Beta\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"FWHM\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eFWHM\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" data-sheets-value='{ \"1\": 2, \"2\": \"3.5nm +0.5\\\/-0.5nm\"}'\u003e\u003cspan style=\"color: #000000; font-family: Arial;\" data-mce-style=\"color: #000000; font-family: Arial;\"\u003e3.5nm +0.5\/-0.5nm\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" data-sheets-value='{ \"1\": 2, \"2\": \"3.5nm +0.5\\\/-0.5nm\"}'\u003e\u003cspan style=\"color: #000000; font-family: Arial;\" data-mce-style=\"color: #000000; font-family: Arial;\"\u003e3.5nm +0.5\/-0.5nm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"CWL (Central Wavelength)\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eCWL (Central Wavelength)\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" data-sheets-value='{ \"1\": 2, \"2\": \"672.4nm\"}'\u003e\u003cspan style=\"color: #000000; font-family: Arial;\" data-mce-style=\"color: #000000; font-family: Arial;\"\u003e672.4nm\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" data-sheets-value='{ \"1\": 2, \"2\": \"486.1nm\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003e486.1nm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"Peak Transmission\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003ePeak Transmission\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" data-sheets-value='{ \"1\": 3, \"3\": 0}' data-sheets-numberformat='{ \"1\": 2, \"2\": \"0.00%\", \"3\": 1}' sdval=\"0.9\" sdnum=\"1033;0;0.00%\"\u003e\u003cspan style=\"color: #000000; font-family: Arial;\" data-mce-style=\"color: #000000; font-family: Arial;\"\u003e90.00%\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" data-sheets-value='{ \"1\": 3, \"3\": 0}' data-sheets-numberformat='{ \"1\": 2, \"2\": \"0.00%\", \"3\": 1}' sdval=\"0.85\" sdnum=\"1033;0;0.00%\"\u003e\u003cspan style=\"color: #000000; font-family: Arial;\" data-mce-style=\"color: #000000; font-family: Arial;\"\u003e85.00%\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"Blocking\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eBlocking\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\" align=\"center\" data-sheets-value='{ \"1\": 2, \"2\": \"≥OD4.5 @ 300-1100nm\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003e≥OD4.5 @ 300-1100nm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"Filter Thickness\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eFilter Thickness\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\" align=\"center\" data-sheets-value='{ \"1\": 2, \"2\": \"2mm+\\\/-0.05mm\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003e2mm+\/-0.05mm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"Basic Substrate\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eBasic Substrate\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\" align=\"center\" data-sheets-value='{ \"1\": 2, \"2\": \" Optical, Single \\\/ Non-glued substrate\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003e Optical, Single \/ Non-glued substrate\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"Surface Quality\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eSurface Quality\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\" align=\"center\" data-sheets-value='{ \"1\": 2, \"2\": \"S\\\/D (scratch\\\/dig)= 60\\\/40 (Refer to MIL-O-13830\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eS\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"Transmitted Wavefront\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eTransmitted Wavefront\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\" align=\"center\" data-sheets-value='{ \"1\": 2, \"2\": \"Lambda\\\/4 or better.\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eLambda\/4 or better.\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"Parallelism\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eParallelism\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\" align=\"center\" data-sheets-value='{ \"1\": 2, \"2\": \"less than 30 arcsec\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eless than 30 arcsec\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"Filter Ring\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eFilter Ring\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\" align=\"center\" data-sheets-value='{ \"1\": 2, \"2\": \"2’’ (M48*0.75)\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003e2’’ (M48*0.75)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eFilter Ring:\u003cbr\u003e2’’ (M48*0.75)\u003cbr\u003eUltra-thin filter cell to minimize vignetting by maximize possible clear aperture\u003cbr\u003eBlack Anodized Finish\u003cbr\u003eLaser Engraving No Fading\u003c\/p\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAntlia ALP-T Dualband 3nm Ha\u0026amp;OIII Filter 2''\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWarranty \u0026amp; Manual\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eAntlia 3-Years Warranty against Delamination\u003c\/span\u003e\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":46135584293093,"sku":"AF-ALP-T-2-SIIHb-3.5nm","price":511.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/alp-t-2-siihb-3.5nm-2.jpg?v=1777043454"},{"product_id":"antlia-alp-t-dual-band-ha-oiii-3nm-sii-hb-3-5nm-2-filter-set","title":"Antlia ALP-T Dual Band Ha \u0026 OIII 3nm + SII \u0026 Hb 3.5nm 2\" Filter Set","description":"\u003ch1\u003eAntlia ALP-T Dual Band Ha\u0026amp;OIII 3nm + SII\u0026amp;Hb 3.5nm 2\" Filter Set\u003c\/h1\u003e\n\u003ch2\u003eHa\u0026amp;OIII 3nm\u003c\/h2\u003e\n\u003cp\u003eThe Antlia ALP-T Dualband 3nm Ha\u0026amp;OIII Filter is a dual narrowband filter, which lets the red H-alpha (656.3nm) and the blue-green OIII (500.7nm) lines through and is primarily engineered for color cameras to assist astrophotographers taking deep sky images with superior SNR (Signal to Noise Ratio). With an FWHM half-bandwidth designed at 3nm and achieving an optical density (OD) of 4.5 on unwanted wavelengths, it works strongly in blocking light pollution, moonlight, and airglow, leading to enhanced contrast in nebulae images by effectively passing the Ha and OIII emission lines signal only.\u003c\/p\u003e\n\u003cp\u003eThe combination of these two dual band Ha\u0026amp;OIII and SII\u0026amp;H-beta filters allows extreme narrow-band images with OSC cameras by capturing the spectral data from 4 channels i.e. Ha\/OIII\/SII\/Hb. The spectrum of these four channels can be separated and recombined into various color palettes in your post-processing. The resulting images can be used for luminance contrast enhancement of traditional RGB-balanced images or the creation of images in various popular false-color palettes such as H-O-Hb, S-H-O, H-S-OHb, H-O-O, etc.\u003c\/p\u003e\n\u003cp\u003eThe advanced multi-coatings on Antlia ALP-T dual-band filters effectively isolate the red, Ha line, blue-green, OIII line, deep red SII, and the blue H-beta lines from emission nebulae, with almost total suppression of optical density (OD)4.5 on unwanted wavelengths from light pollution, moonlight, and airglow. The result is that both the ALP-T dual band Ha\u0026amp;OIII version and SII\u0026amp;Hb version create a superior signal-to-noise ratio and better contrast in your OSC images whether used in urban or rural areas, making them excellent choices for astrophotographers aiming to capture high-quality and more detailed celestial images.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMain features and application:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePasses OIII 500.7nm and H-alpha 656.3nm lines\u003c\/li\u003e\n\u003cli\u003eCapturing of the two main emission wavebands in the red and blue-green at the same time\u003c\/li\u003e\n\u003cli\u003eUltra FWHM 3nm design allows for increasing exposure time and capturing detailed nebulae signal\u003c\/li\u003e\n\u003cli\u003eDesigned to be used primarily with color cameras to capture cleaner data or used as Luminance filter mono cameras to save imaging time\u003c\/li\u003e\n\u003cli\u003eRecommended to be used with ALP-T Dual Band SII\u0026amp;Hb filter to create images with better\u003c\/li\u003e\n\u003cli\u003eSNR( signal-to-noise) and better isolation between the 4 channels\u003c\/li\u003e\n\u003cli\u003eSuppression of optical density (OD)4.5 on unwanted wavelengths adds signal-to-noise\u003c\/li\u003e\n\u003cli\u003eNear IR (NIR) is blocked up to 1100nm\u003c\/li\u003e\n\u003cli\u003eIdeal flat-top and moderate bandpass reducing spectrum downshifts\u003c\/li\u003e\n\u003cli\u003eRecommended to use the filter with optics f-ratios slower than f\/4 for best performance, for optics faster than f\/4, pre-shifted highspeed version is a better choice\u003c\/li\u003e\n\u003cli\u003eIon Gun Assisted Deposition of double-sided multi-layer coating technology on the double-sided polished substrate making it the most consistent and accurate light pollution suppression filter\u003c\/li\u003e\n\u003cli\u003eHalo suppression anti-reflective coating is used to minimize halo and internal reflections\u003c\/li\u003e\n\u003cli\u003eDesigned to suppress artificial lighting from Bortle scale 1 to Bortle scale 8\u003c\/li\u003e\n\u003cli\u003eBlackened edges of unmounted sizes to minimize internal reflections\u003c\/li\u003e\n\u003cli\u003eAntlia's ever-trusted coating technology makes its durability very reliable\u003c\/li\u003e\n\u003cli\u003eWhile primarily designed for use with color cameras, the filter is also highly effective with monochrome cameras to save imaging time\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical Data:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFWHM: 3nm +0.6\/-0.1nm\u003c\/li\u003e\n\u003cli\u003eCWL (Central Wavelength):\n\u003cul\u003e\n\u003cli\u003eHydrogen-alpha: 656.3nm\u003c\/li\u003e\n\u003cli\u003eOxygen III: 500.7nm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003ePeak Transmission:\n\u003cul\u003e\n\u003cli\u003eHydrogen-alpha: 90%\u003c\/li\u003e\n\u003cli\u003eOxygen III: 82%\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003eBlocking: ≥OD4.5 @ 300-1100nm\u003c\/li\u003e\n\u003cli\u003eFilter Thickness: 2mm+\/-0.05mm\u003c\/li\u003e\n\u003cli\u003eBasic Substrate Optical, Single \/ Non-glued substrate\u003c\/li\u003e\n\u003cli\u003eSurface Quality S\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/li\u003e\n\u003cli\u003eTransmitted Wavefront Lambda\/4 or better. Parallelism less than 30 arcsec\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eFilter Ring:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e2’’ Mounted (M48*0.75 thread)\u003c\/li\u003e\n\u003cli\u003eUltra-thin filter cell to minimize vignetting by maximizing possible clear aperture\u003c\/li\u003e\n\u003cli\u003eBlack Anodized Finish\u003c\/li\u003e\n\u003cli\u003eLaser Engraving, No Fading\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSII\u0026amp;Hb 3.5nm Filter\u003c\/h2\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eThe ALP-T dual band 3.5nm SII\u0026amp;Hb filter is a dual narrowband filter, which lets the deep red Sulfur-II 672.4nm and the blue Hydrogen-Beta 486.1nm lines through and is primarily engineered for color cameras to assist astrophotographers taking deep sky images with superior SNR (Signal to Noise Ratio). With an FWHM half-bandwidth designed at 3.5nm and achieving an optical density (OD) of 4.5 on unwanted wavelengths, it works strongly in blocking light pollution, moonlight, and airglow, leading to enhanced contrast in nebulae images by effectively passing the SII and H-beta emission lines signal only.\u003c\/p\u003e\n\u003cp\u003eIt is a significant addition to the popular Antlia ALP-T dual-band Ha\u0026amp;OIII filter and enables false-color images and narrow-band nebula images using OSC. When capturing data with this filter, the nebulae are recorded with high signal-to-noise ratios and greater contrast than without it.\u003c\/p\u003e\n\u003cp\u003eThe combination of these two dual band Ha\u0026amp;OIII and SII\u0026amp;H-beta filters allows extreme narrow-band images with OSC cameras by capturing the spectral data from 4 channels i.e. Ha\/OIII\/SII\/Hb. The spectrum of these four channels can be separated and recombined into various color palettes in your post-processing. The resulting images can be used for luminance contrast enhancement of traditional RGB-balanced images or the creation of images in various popular false-color palettes such as H-O-Hb, S-H-O, H-S-OHb, H-O-O, etc.\u003c\/p\u003e\n\u003cp\u003eThe advanced multi-coatings on Antlia ALP-T dual-band filters effectively isolate the red, Ha line, blue-green, OIII line, deep red SII, and the blue H-beta lines from emission nebulae, with almost total suppression of optical density (OD)4.5 on unwanted wavelengths from light pollution, moonlight, and airglow. The result is that both the ALP-T dual band Ha\u0026amp;OIII version and SII\u0026amp;Hb version create a superior signal-to-noise ratio and better contrast in your OSC images whether used in urban or rural areas, making them excellent choices for astrophotographers aiming to capture high-quality and more detailed celestial images.\/p\u0026gt;\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMain features and application:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePasses SII 672.4nm and H-Beta 486.1nm lines\u003c\/li\u003e\n\u003cli\u003eCapturing of the two main emission wavebands in the deep red and blue at the same time\u003c\/li\u003e\n\u003cli\u003eUltra FWHM 3.5nm design allows for increasing exposure time and capturing detailed nebulae signal\u003c\/li\u003e\n\u003cli\u003eDesigned to be used primarily with color cameras to capture cleaner data or used as Luminance filter mono cameras to save imaging time\u003c\/li\u003e\n\u003cli\u003eRecommended to be used with ALP-T Dual Band Ha\u0026amp;OIII filter to create images with better\u003c\/li\u003e\n\u003cli\u003eSNR( signal-to-noise) and better isolation between the 4 channels\u003c\/li\u003e\n\u003cli\u003eSuppression of optical density (OD)4.5 on unwanted wavelengths improves SNR( signal-to-noise)\u003c\/li\u003e\n\u003cli\u003eNear IR (NIR) is blocked up to 1100nm\u003c\/li\u003e\n\u003cli\u003eIdeal flat-top and moderate bandpass reducing spectrum downshifts\u003c\/li\u003e\n\u003cli\u003eRecommended to use the filter with optics f-ratios slower than f\/4 for best performance, for optics faster than f\/4, pre-shifted highspeed version is a better choice\u003c\/li\u003e\n\u003cli\u003eIon Gun Assisted Deposition of double-sided multi-layer coating technology on the double-sided polished substrate making it the most consistent and accurate light pollution suppression filter\u003c\/li\u003e\n\u003cli\u003eHalo suppression anti-reflective coating is used to minimize halo and internal reflections\u003c\/li\u003e\n\u003cli\u003eDesigned to suppress artificial lighting from Bortle scale 1 to Bortle scale 8\u003c\/li\u003e\n\u003cli\u003eBlackened edges of unmounted sizes to minimize internal reflections\u003c\/li\u003e\n\u003cli\u003eAntlia's ever-trusted coating technology makes filter durability very reliable\u003c\/li\u003e\n\u003cli\u003eWhile primarily designed for use with color cameras, the filter is also highly effective with monochrome cameras to save imaging time\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical Data:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFWHM: 3.5nm +0.5\/-0.5nm\u003c\/li\u003e\n\u003cli\u003eCWL (Central Wavelength):\n\u003cul\u003e\n\u003cli\u003eSulfur-II: 672.4nm\u003c\/li\u003e\n\u003cli\u003eHydrogen-Beta: 486.1nm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003ePeak Transmission:\n\u003cul\u003e\n\u003cli\u003eSulfur-II: 90%\u003c\/li\u003e\n\u003cli\u003eHydrogen-Beta: 85%\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003eBlocking: ≥OD4.5 @ 300-1100nm\u003c\/li\u003e\n\u003cli\u003eFilter Thickness: 2mm+\/-0.05mm\u003c\/li\u003e\n\u003cli\u003eBasic Substrate Optical, Single \/ Non-glued substrate\u003c\/li\u003e\n\u003cli\u003eSurface Quality S\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/li\u003e\n\u003cli\u003eTransmitted Wavefront Lambda\/4 or better. Parallelism less than 30 arcsec\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eFilter Ring:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e2’’ Mounted (M48*0.75 thread)\u003c\/li\u003e\n\u003cli\u003eUltra-thin filter cell to minimize vignetting by maximizing possible clear aperture\u003c\/li\u003e\n\u003cli\u003eBlack Anodized Finish\u003c\/li\u003e\n\u003cli\u003eLaser Engraving, No Fading\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot Recommended:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSolar Observing and imaging\u003c\/li\u003e\n\u003cli\u003eNight visual observation\u003c\/li\u003e\n\u003cli\u003eDO NOT LOOK AT THE SUN WITH ANTLIA FILTERS. Serious eye damage will result if you fail to observe the warning.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003cstrong\u003eNot Permitted:\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eDO NOT LOOK AT THE SUN WITH THIS FILTER DIRECTLY\u003c\/strong\u003e\u003cbr\u003eSerious eye damage will result if you fail to observe the warning.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eAntlia ALP-T Dualband 3nm Ha\u0026amp;OIII Filter \u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable border=\"0\" cellspacing=\"0\"\u003e\n\u003ccolgroup width=\"187\"\u003e\u003c\/colgroup\u003e \u003ccolgroup width=\"152\"\u003e\u003c\/colgroup\u003e \u003ccolgroup width=\"144\"\u003e\u003c\/colgroup\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"\"}' valign=\"middle\" align=\"center\" height=\"21\"\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"Hydrogen-alpha\"}' valign=\"middle\" align=\"center\"\u003eHydrogen-alpha\u003c\/td\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"Oxygen III\"}' valign=\"middle\" align=\"center\"\u003eOxygen III\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"FWHM\"}' valign=\"middle\" align=\"center\" height=\"21\"\u003eFWHM\u003c\/td\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"3nm +0.6\\\/-0.1nm \"}' valign=\"middle\" align=\"center\"\u003e\u003cspan style=\"font-family: Liberation Serif;\" data-mce-style=\"font-family: Liberation Serif;\"\u003e3nm +0.6\/-0.1nm \u003c\/span\u003e\u003c\/td\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"3nm +0.6\\\/-0.1nm \"}' valign=\"middle\" align=\"center\"\u003e\u003cspan style=\"font-family: Liberation Serif;\" data-mce-style=\"font-family: Liberation Serif;\"\u003e3nm +0.6\/-0.1nm \u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"CWL\"}' valign=\"middle\" align=\"center\" height=\"21\"\u003eCWL\u003c\/td\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"656.3nm \"}' valign=\"middle\" align=\"center\"\u003e\u003cspan style=\"font-family: Liberation Serif;\" data-mce-style=\"font-family: Liberation Serif;\"\u003e656.3nm \u003c\/span\u003e\u003c\/td\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"500.7nm \"}' valign=\"middle\" align=\"center\"\u003e\u003cspan style=\"font-family: Liberation Serif;\" data-mce-style=\"font-family: Liberation Serif;\"\u003e500.7nm \u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"Peak transmission\"}' valign=\"middle\" align=\"center\" height=\"21\"\u003ePeak transmission\u003c\/td\u003e\n\u003ctd data-sheets-numberformat='{ \"1\": 2, \"2\": \"0.00%\", \"3\": 1}' data-sheets-value='{ \"1\": 3, \"3\": 0}' valign=\"middle\" align=\"center\" sdnum=\"1033;0;0.00%\" sdval=\"0.9\"\u003e90.00%\u003c\/td\u003e\n\u003ctd data-sheets-numberformat='{ \"1\": 2, \"2\": \"0.00%\", \"3\": 1}' data-sheets-value='{ \"1\": 3, \"3\": 0}' valign=\"middle\" align=\"center\" sdnum=\"1033;0;0.00%\" sdval=\"0.9\"\u003e90.00%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"Blocking\"}' valign=\"middle\" align=\"center\" height=\"21\"\u003eBlocking\u003c\/td\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"≥OD4.5 @ 300-1100nm \"}' valign=\"middle\" align=\"center\" colspan=\"2\"\u003e\u003cspan style=\"font-family: Liberation Serif;\" data-mce-style=\"font-family: Liberation Serif;\"\u003e≥OD4.5 @ 300-1100nm \u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"Filter thickness\"}' valign=\"middle\" align=\"center\" height=\"21\"\u003eFilter thickness\u003c\/td\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"2mm+\\\/-0.05mm \"}' valign=\"middle\" align=\"center\" colspan=\"2\"\u003e\u003cspan style=\"font-family: Liberation Serif;\" data-mce-style=\"font-family: Liberation Serif;\"\u003e2mm+\/-0.05mm \u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"Basic Substrate\"}' valign=\"middle\" align=\"center\" height=\"21\"\u003eBasic Substrate\u003c\/td\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"Optical, Single \\\/ Non-glued substrate \"}' valign=\"middle\" align=\"center\" colspan=\"2\"\u003e\u003cspan style=\"font-family: Liberation Serif;\" data-mce-style=\"font-family: Liberation Serif;\"\u003eOptical, Single \/ Non-glued substrate \u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"Surface Quality\"}' valign=\"middle\" align=\"center\" height=\"40\"\u003eSurface Quality\u003c\/td\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"S\\\/D (scratch\\\/dig)= 60\\\/40 (Refer to MIL-O- \"}' valign=\"middle\" align=\"center\" colspan=\"2\"\u003e\u003cspan style=\"font-family: Liberation Serif;\" data-mce-style=\"font-family: Liberation Serif;\"\u003eS\/D (scratch\/dig)= 60\/40 (Refer to MIL-O- \u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"Transmitted Wavefront\"}' valign=\"middle\" align=\"center\" height=\"21\"\u003eTransmitted Wavefront\u003c\/td\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"Lambda\\\/4 or better. \"}' valign=\"middle\" align=\"center\" colspan=\"2\"\u003e\u003cspan style=\"font-family: Liberation Serif;\" data-mce-style=\"font-family: Liberation Serif;\"\u003eLambda\/4 or better. \u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"Parallelism\"}' valign=\"middle\" align=\"center\" height=\"21\"\u003eParallelism\u003c\/td\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"less than 30 arcsec \"}' valign=\"middle\" align=\"center\" colspan=\"2\"\u003e\u003cspan style=\"font-family: Liberation Serif;\" data-mce-style=\"font-family: Liberation Serif;\"\u003eless than 30 arcsec \u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"Filter Ring\"}' valign=\"middle\" align=\"center\" height=\"21\"\u003eFilter Ring\u003c\/td\u003e\n\u003ctd data-sheets-value='{ \"1\": 2, \"2\": \"2’’ (M48*0.75) \"}' valign=\"middle\" align=\"center\" colspan=\"2\"\u003e\u003cspan style=\"font-family: Liberation Serif;\" data-mce-style=\"font-family: Liberation Serif;\"\u003e2’’ (M48*0.75) \u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp align=\"left\" class=\"western\"\u003e\u003cspan style=\"font-family: Arial, sans-serif;\" data-mce-style=\"font-family: Arial, sans-serif;\"\u003e\u003cspan style=\"font-size: small;\" data-mce-style=\"font-size: small;\"\u003e\u003cspan lang=\"en-US\"\u003e\u003cb\u003eAntlia ALP-T dualband 3.5nm SII\u0026amp;H-beta Filter\u003c\/b\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ctable cellspacing=\"0\" border=\"0\"\u003e\n\u003ccolgroup width=\"241\"\u003e\u003c\/colgroup\u003e \u003ccolgroup width=\"214\"\u003e\u003c\/colgroup\u003e \u003ccolgroup width=\"235\"\u003e\u003c\/colgroup\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"\"}'\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" data-sheets-value='{ \"1\": 2, \"2\": \"Sulfur-II\"}'\u003e\u003cb\u003e\u003cspan style=\"color: #4d4d4d; font-family: Arial;\" data-mce-style=\"color: #4d4d4d; font-family: Arial;\"\u003eSulfur-II\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" data-sheets-value='{ \"1\": 2, \"2\": \"Hydrogen-Beta\"}'\u003e\u003cb\u003e\u003cspan style=\"color: #4d4d4d; font-family: Arial;\" data-mce-style=\"color: #4d4d4d; font-family: Arial;\"\u003eHydrogen-Beta\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"FWHM\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eFWHM\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" data-sheets-value='{ \"1\": 2, \"2\": \"3.5nm +0.5\\\/-0.5nm\"}'\u003e\u003cspan style=\"color: #000000; font-family: Arial;\" data-mce-style=\"color: #000000; font-family: Arial;\"\u003e3.5nm +0.5\/-0.5nm\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" data-sheets-value='{ \"1\": 2, \"2\": \"3.5nm +0.5\\\/-0.5nm\"}'\u003e\u003cspan style=\"color: #000000; font-family: Arial;\" data-mce-style=\"color: #000000; font-family: Arial;\"\u003e3.5nm +0.5\/-0.5nm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"CWL (Central Wavelength)\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eCWL (Central Wavelength)\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" data-sheets-value='{ \"1\": 2, \"2\": \"672.4nm\"}'\u003e\u003cspan style=\"color: #000000; font-family: Arial;\" data-mce-style=\"color: #000000; font-family: Arial;\"\u003e672.4nm\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" data-sheets-value='{ \"1\": 2, \"2\": \"486.1nm\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003e486.1nm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"Peak Transmission\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003ePeak Transmission\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" data-sheets-value='{ \"1\": 3, \"3\": 0}' data-sheets-numberformat='{ \"1\": 2, \"2\": \"0.00%\", \"3\": 1}' sdval=\"0.9\" sdnum=\"1033;0;0.00%\"\u003e\u003cspan style=\"color: #000000; font-family: Arial;\" data-mce-style=\"color: #000000; font-family: Arial;\"\u003e90.00%\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" data-sheets-value='{ \"1\": 3, \"3\": 0}' data-sheets-numberformat='{ \"1\": 2, \"2\": \"0.00%\", \"3\": 1}' sdval=\"0.85\" sdnum=\"1033;0;0.00%\"\u003e\u003cspan style=\"color: #000000; font-family: Arial;\" data-mce-style=\"color: #000000; font-family: Arial;\"\u003e85.00%\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"Blocking\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eBlocking\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\" align=\"center\" data-sheets-value='{ \"1\": 2, \"2\": \"≥OD4.5 @ 300-1100nm\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003e≥OD4.5 @ 300-1100nm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"Filter Thickness\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eFilter Thickness\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\" align=\"center\" data-sheets-value='{ \"1\": 2, \"2\": \"2mm+\\\/-0.05mm\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003e2mm+\/-0.05mm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"Basic Substrate\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eBasic Substrate\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\" align=\"center\" data-sheets-value='{ \"1\": 2, \"2\": \" Optical, Single \\\/ Non-glued substrate\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003e Optical, Single \/ Non-glued substrate\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"Surface Quality\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eSurface Quality\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\" align=\"center\" data-sheets-value='{ \"1\": 2, \"2\": \"S\\\/D (scratch\\\/dig)= 60\\\/40 (Refer to MIL-O-13830\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eS\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"Transmitted Wavefront\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eTransmitted Wavefront\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\" align=\"center\" data-sheets-value='{ \"1\": 2, \"2\": \"Lambda\\\/4 or better.\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eLambda\/4 or better.\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"Parallelism\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eParallelism\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\" align=\"center\" data-sheets-value='{ \"1\": 2, \"2\": \"less than 30 arcsec\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eless than 30 arcsec\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"Filter Ring\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003eFilter Ring\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\" align=\"center\" data-sheets-value='{ \"1\": 2, \"2\": \"2’’ (M48*0.75)\"}'\u003e\u003cspan style=\"font-family: Arial;\" data-mce-style=\"font-family: Arial;\"\u003e2’’ (M48*0.75)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eFilter Ring:\u003cbr\u003e2’’ (M48*0.75)\u003cbr\u003eUltra-thin filter cell to minimize vignetting by maximize possible clear aperture\u003cbr\u003eBlack Anodized Finish\u003cbr\u003eLaser Engraving No Fading\u003c\/p\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAntlia ALP-T Dualband 3nm Ha\u0026amp;OIII Filter 2''\u003c\/li\u003e\n\u003cli\u003eAntlia ALP-T Dualband 3.5nm SII\u0026amp;Hb Filter 2\"\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWarranty \u0026amp; Manual\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eAntlia 3-Years Warranty against Delamination\u003c\/span\u003e\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":46135608017125,"sku":"AF-ALP-T-2-HaOIII-SIIHb-3nm-SET","price":1008.2,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/alp-t-2-haoiii-3nm-2.jpg?v=1777043671"},{"product_id":"svbony-sv240-multi-narrowband-filter-galaxy-nebula-nir-near-infrared-light-pollution-2-mounted-for-urban-astrophotography-w9191a","title":"SVBONY SV240 Multi-Narrowband Filter Galaxy \u0026 Nebula Near-infrared Light Pollution","description":"\u003ch1\u003eSVBONY SV240 Multi-Narrowband Filter Galaxy \u0026amp; Nebula Near-infrared Light Pollution \u003c\/h1\u003e\n\u003cp\u003eSVBONY SV240 multi-bandpass filter is designed for urban astrophotography; it can isolate the Ha; OIII; and H-Beta from the background light pollution efficiently; you can astrophotography in urban without a long struggle to suburbs; save your time and high efficiency; and it is suitable for photoing most galaxies; reflection nebulae; emission nebula; and star clusters; and so on. \u003c\/p\u003e\n\u003ch2\u003eCut-off Depth ≥ OD4\u003c\/h2\u003e\n\u003cp\u003eHighly efficient in blocking urban light pollution or other background light; use this multi-bandpass filter for astrophotography in urban without traveling long distances to the suburbs. The SV240 narrowband filter can block the influence of urban light pollution and other background lights efficiently. \u003c\/p\u003e\n\u003cp\u003eFWHM; 24nm; 20 nm; 115 nm; the wide wavelength and high transmittance of this multi-bandpass filters in Ha; OIII; H-Beta wavelength helps the colorful image photoing.\u003c\/p\u003e\n\u003ch1\u003eResistant of BORTLE 8\u003c\/h1\u003e\n\u003cp\u003eThe multilayer coating design for the remarkable performance in tacking light pollution and high transmittance in core wavelength. Astrophotography in urban comfortable. The strong ability to tacking light pollution up to BORTLE 8 allows it can be used in multiple cities, and no need to go to the suburbs. Time and labor saving.\u003c\/p\u003e\n\u003ch2\u003eWavelength Range of The Filter\u003c\/h2\u003e\n\u003cp\u003eThe wide range allows the filter to be used in multiple scenarios. Stronger resistance to light pollution. Near IR (NIR) is blocked up to 1100nm. High ability to process the wavelength from 300 to 1100nm. Effectively isolate the light pollution band.\u003c\/p\u003e\n\u003ch2\u003ePhotography All Kinds of Targets\u003c\/h2\u003e\n\u003cp\u003eThe wavelength can meet the astrophotography needs of most galaxies, reflection nebulae, emission nebula, star clusters, and other broad-spectrum targets. And the targets can be captured in a short time, which is widely used and high efficiency. \u003c\/p\u003e\n\u003cp\u003eIf you have different astrophotography systems, no need to prepare dedicated filters; one SV240 can meet your needs due to its high compatibility. Considering the high quantum efficiency (QE) characteristics of the latest cameras (such as IMX585 and IMX464) in the near-infrared region and also this region less susceptible to artificial light pollution, the SV240 multi-narrowband filter adds high transmission in the near-infrared (NIR) band. This spectrum design improves the image signal-to-noise ratio and contrast by capturing signal in visible bands and NIR regions while maintaining good colour balance and being easier to manage in post-processing.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCut-off depth ≥OD4; highly efficient in blocking urban light pollution or other background light; use this multi-bandpass filter for astrophotography in urban without traveling long distances to the suburbs;\u003c\/li\u003e\n\u003cli\u003eCompatible with 99% astrophotography systems; if you have different astrophotography systems, no need to prepare dedicated filters, one SV240 can meet your needs due to its high compatibility;\u003c\/li\u003e\n\u003cli\u003ePhotoing more kinds of targets; SV240 multi-narrowband filter select Ha,OIII,H-Beta wavelength effectively can cover almost photoing needs;\u003c\/li\u003e\n\u003cli\u003eHigh transmittance; the \u0026gt;90% transmittance in core wavelength of Ha,OIII, H-Beta, more objects for your astrophotography by using this multi-bandpass filter;\u003c\/li\u003e\n\u003cli\u003eMulti-bandpass filters; without multiple filters' combination for colorful images; rich color in your lens;\u003c\/li\u003e\n\u003cli\u003eResistant of BORTLE 8; the multi-narrowband filters can be resistant from Bortle 1 to Bortle 8 cities, suitable for almost all urban;\u003c\/li\u003e\n\u003cli\u003e300-1100 mm working wavelength; the wider coverage of this multi-narrowband filter allows it to have a strong ability to tack light pollution.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eNote: \u003c\/span\u003e\u003c\/strong\u003eOptical filters that use infrared light often cause halos in the NIR region; which are exacerbated by the halos produced by the filter itself.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable xmlns=\"http:\/\/www.w3.org\/1999\/xhtml\" cellspacing=\"0\" cellpadding=\"0\" dir=\"ltr\" border=\"1\" style=\"table-layout: fixed; font-size: 10pt; font-family: Arial; width: 703px; border-collapse: collapse; border: medium;\" data-sheets-root=\"1\" data-sheets-baot=\"1\" height=\"527\"\u003e\n\u003ccolgroup\u003e \u003ccol width=\"100\" style=\"width: 266px;\"\u003e \u003ccol width=\"100\" style=\"width: 266px;\"\u003e \u003c\/colgroup\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 20px;\"\u003e\n\u003ctd style=\"overflow: hidden; padding: 0px 3px 0px 3px; vertical-align: bottom; font-size: 12pt;\"\u003eBrand\u003c\/td\u003e\n\u003ctd style=\"overflow: hidden; padding: 0px 3px 0px 3px; vertical-align: bottom; font-size: 12pt;\"\u003eSVBONY\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 20px;\"\u003e\n\u003ctd style=\"overflow: hidden; padding: 0px 3px 0px 3px; vertical-align: bottom; font-size: 12pt;\"\u003eModel\u003c\/td\u003e\n\u003ctd style=\"overflow: hidden; padding: 0px 3px 0px 3px; vertical-align: bottom; font-size: 12pt;\"\u003eSV240\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 20px;\"\u003e\n\u003ctd style=\"overflow: hidden; padding: 0px 3px 0px 3px; vertical-align: bottom; font-size: 12pt;\"\u003eName\u003c\/td\u003e\n\u003ctd style=\"border-right: 1px solid transparent; overflow: visible; padding: 0px 0px 0px 0px; vertical-align: bottom; font-size: 12pt;\"\u003e\n\u003cdiv style=\"white-space: nowrap; overflow: hidden; position: relative; width: 196px; left: 3px;\"\u003e\n\u003cdiv style=\"float: left;\"\u003eMulti-Narrowband Filter\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 20px;\"\u003e\n\u003ctd style=\"overflow: hidden; padding: 0px 3px 0px 3px; vertical-align: bottom; font-size: 12pt;\"\u003eSize\u003c\/td\u003e\n\u003ctd style=\"overflow: hidden; padding: 0px 3px 0px 3px; vertical-align: bottom; font-size: 12pt;\"\u003e2-inch or 1.25-inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 20px;\"\u003e\n\u003ctd style=\"overflow: hidden; padding: 0px 3px 0px 3px; vertical-align: bottom; font-size: 12pt;\"\u003eSubstrate Thickness\u003c\/td\u003e\n\u003ctd style=\"overflow: hidden; padding: 0px 3px 0px 3px; vertical-align: bottom; font-size: 12pt;\"\u003e2mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 20px;\"\u003e\n\u003ctd style=\"overflow: hidden; padding: 0px 3px 0px 3px; vertical-align: bottom; font-size: 12pt;\"\u003eClear Aperture\u003c\/td\u003e\n\u003ctd style=\"overflow: hidden; padding: 0px 3px 0px 3px; vertical-align: bottom; font-size: 12pt;\"\u003e44mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 20px;\"\u003e\n\u003ctd style=\"overflow: hidden; padding: 0px 3px 0px 3px; vertical-align: bottom; font-size: 12pt;\"\u003eWavelength Range\u003c\/td\u003e\n\u003ctd style=\"overflow: hidden; padding: 0px 3px 0px 3px; vertical-align: bottom; font-size: 12pt;\"\u003e300-1100nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 20px;\"\u003e\n\u003ctd style=\"overflow: hidden; padding: 0px 3px 0px 3px; vertical-align: bottom; font-size: 12pt;\"\u003eFWHM\u003c\/td\u003e\n\u003ctd style=\"border-right: 1px solid transparent; overflow: visible; padding: 0px 0px 0px 0px; vertical-align: bottom; font-size: 12pt;\"\u003e\n\u003cdiv style=\"white-space: nowrap; overflow: hidden; position: relative; width: 196px; left: 3px;\"\u003e\n\u003cdiv style=\"float: left;\"\u003e24nm \u0026amp; 20nm \u0026amp; 115nm\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 20px;\"\u003e\n\u003ctd style=\"overflow: hidden; padding: 0px 3px 0px 3px; vertical-align: bottom; font-size: 12pt;\"\u003eBlocking\u003c\/td\u003e\n\u003ctd style=\"border-right: 1px solid transparent; overflow: visible; padding: 0px 0px 0px 0px; vertical-align: bottom; font-size: 12pt;\"\u003e\n\u003cdiv style=\"white-space: nowrap; overflow: hidden; position: relative; width: 701px; left: 3px;\"\u003e\n\u003cdiv style=\"float: left;\"\u003e\u0026gt;OD5@300-450nm；\u0026gt;OD4@560-620nm；\u0026gt;OD2\u0026gt;690-750nm； \u0026gt;OD3@940-1100nm\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 20px;\"\u003e\n\u003ctd style=\"overflow: hidden; padding: 0px 3px 0px 3px; vertical-align: bottom; font-size: 12pt;\"\u003ePeak Transmittance\u003c\/td\u003e\n\u003ctd style=\"border-right: 1px solid transparent; overflow: visible; padding: 0px 0px 0px 0px; vertical-align: bottom; font-size: 12pt;\"\u003e\n\u003cdiv style=\"white-space: nowrap; overflow: hidden; position: relative; width: 802px; left: 3px;\"\u003e\n\u003cdiv style=\"float: left;\"\u003eT＞95%@486.1nm；T＞92%@495.9nm；T\u0026gt;85%@500.7nm；T\u0026gt;95%@656.3nm； Tavg\u0026gt;95%@830-870nm\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 20px;\"\u003e\n\u003ctd style=\"overflow: hidden; padding: 0px 3px 0px 3px; vertical-align: bottom; font-size: 12pt;\"\u003eSurface Quality\u003c\/td\u003e\n\u003ctd style=\"overflow: hidden; padding: 0px 3px 0px 3px; vertical-align: bottom; font-size: 12pt;\"\u003e60\/40\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 20px;\"\u003e\n\u003ctd style=\"overflow: hidden; padding: 0px 3px 0px 3px; vertical-align: bottom; font-size: 12pt;\"\u003eSurface Parallelism\u003c\/td\u003e\n\u003ctd style=\"overflow: hidden; padding: 0px 3px 0px 3px; vertical-align: bottom; font-size: 12pt;\"\u003e1\/4λ\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 20px;\"\u003e\n\u003ctd style=\"overflow: hidden; padding: 0px 3px 0px 3px; vertical-align: bottom; font-size: 12pt;\"\u003eThread\u003c\/td\u003e\n\u003ctd style=\"overflow: hidden; padding: 0px 3px 0px 3px; vertical-align: bottom; font-size: 12pt;\"\u003eM48x0.75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 20px;\"\u003e\n\u003ctd style=\"overflow: hidden; padding: 0px 3px 0px 3px; vertical-align: bottom; font-size: 12pt;\"\u003eSingle Thread\u003c\/td\u003e\n\u003ctd style=\"overflow: hidden; padding: 0px 3px 0px 3px; vertical-align: bottom; font-size: 12pt;\"\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 20px;\"\u003e\n\u003ctd style=\"overflow: hidden; padding: 0px 3px 0px 3px; vertical-align: bottom; font-size: 12pt;\"\u003eNet Weight\u003c\/td\u003e\n\u003ctd style=\"border-right: 1px solid transparent; overflow: visible; padding: 0px 0px 0px 0px; vertical-align: bottom; font-size: 12pt;\"\u003e\n\u003cdiv style=\"white-space: nowrap; overflow: hidden; position: relative; width: 196px; left: 3px;\"\u003e\n\u003cdiv style=\"float: left;\"\u003e12.5g \/ 0.44oz \/0.027lb\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003e\u003cbr\u003e\u003c\/h3\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cp\u003eSVBONY SV240 Multi-Narrowband Filter Galaxy \u0026amp; Nebula Near-infrared Light Pollution \u003c\/p\u003e\n\u003ch3\u003eWarranty\u003c\/h3\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/istronomyplus.com\/pages\/svbony-warranty\"\u003eSVBony's Warranty\u003c\/a\u003e\u003c\/p\u003e","brand":"Svbony","offers":[{"title":"1.25-inch","offer_id":47762725765349,"sku":"SVB-W9191B","price":144.0,"currency_code":"CAD","in_stock":true},{"title":"2-inch","offer_id":47762725798117,"sku":"SVB-W9191A","price":167.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/1_34ea8596-d083-409d-9149-3b5a569d10cd.jpg?v=1777043470"},{"product_id":"optolong-l-para-10nm-dual-narrowband-light-pollution-filter-lpar-200","title":"Optolong L-Para 10nm Dual Narrowband Light Pollution Filter (L-PARA-2)","description":"\u003ch1 class=\"title\"\u003eOptolong L-Para 10nm Dual Narrowband Light Pollution Filter\u003c\/h1\u003e\n\u003cp\u003e\u003cstrong\u003eWhy do we make a L-Para filter with a dual band of 10nm?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIn Chinese culture, the number ten symbolizes perfection in every way. An idiom in Chinese, 'shi quan shi mei' epitomizes reaching the best and most ideal state. Therefore, we aspire for the L-Para filter to achieve this standard. Specifically, it operates in dual bands, each with a width of 10nm. The repetition of the number ten signifies double wishes for your photography experiences and clear skies always. \u003c\/p\u003e\n\u003cp\u003eDuring the research phase, L-Para is dedicated to optimizing halo performance and effectively blocking out light pollution emissions. Images captured by L- Para will exhibit a dark background and precise colors. Halos around bright stars are caused by a complex optical chain. While we can't say no halo, but we believe that L-Para offers a entirely new perspective. \u003c\/p\u003e\n\u003cp\u003eAdditionally, L-Para is compatible with both fast optics and normal optics, covering focal ratios from F2 and above. One filter is designed to work with all your telescopes. L-Para, bringing you greater efficiency.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003e1.  Optolong L-Para(L-Parallels)\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eOptolong L-Para is a brand new dual narrowband 10nm light pollution filter. The FWHM of L-Para is 10nm for OIII (500.7nm) and H-Alpha (656.3nm) respectively. The transmittance of nebulae emission lines at are both greater than 85% in system with focal ratios of F2 and above. It effectively filters out mercury lamp, sodium lamp, and LED light pollution emission lines. At the same time, it has excellent contrast and anti-halo characteristics, allowing you to capture detailed and vivid nebula images. L-Para is suitable for both normal optical systems and fast optical systems, such as RASA and Hyperstar systems. Even when light is incident at an oblique angle, it can still maintain high transmission rates to provide you with a clear and precise shooting experience.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eBroad Compatibility:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA dual narrowband filter suitable for all telescope systems, adaptable to fast optics (focal ratios of F2, F2.8, F3.2, F4) as well as various standard\/normal focal ratio telescopes.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eLight Pollution Resistance:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eEffectively cuts off emission lines from mercury lamps, sodium lamps, LEDs, and other light pollution sources, making it applicable to Bortle Scale1- 7 dark skies.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHigh Transmission Rate:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIn systems with a focal ratio of F2 and above, the transmittance of nebula emission lines OIII and Ha exceed 85%, resulting in higher imaging efficiency.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eExcellent Contrast:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe high transmittance of nebula emission lines (OIII \u0026amp; Ha) combined with deep cut-off of light pollution bands significantly improves image contrast and detail richness.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAnti-Halo Characteristics:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe design has undergone several round of optimizations and many times of repeated testing ,resulting in a marked improvement in anti-halo performance, enhancing the capture of bright stars.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003e2.Spectrum\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eAccording to the characteristics of the emission lines of celestial bodies and light pollution, as well as the characteristicas of the normal telescope and fast ratio imaging system, L-Para has been maintaining high transmittance at OIII and Ha while blocking light pollution emission lines.\u003c\/p\u003e\n\u003cp\u003e\u003cimg height=\"592\" width=\"1034\" alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/9b96104f725faacefa9ded926bfab8da.png?v=1736024501\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg height=\"498\" width=\"1025\" alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/2700143340459da0e3aa3e900c9c60f4.png?v=1736024535\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg height=\"523\" width=\"1080\" alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/ec92b95b51a57afdfb563adfcf710c88.png?v=1736024560\"\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003e3. Coating Technology\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003e·Multi-layers anti-reflection coating\u003c\/p\u003e\n\u003cp\u003e·Non-cementing optical substrate coating\u003c\/p\u003e\n\u003cp\u003e·Optolong filter adopts precision coating based on Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL(central wavelength) no deviation affected by temperature change.\u003c\/p\u003e\n\u003cp\u003e·Planetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and Optical density of off-band.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications \u003c\/h3\u003e\n\u003cp\u003e2\"（M48×0.75） \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOuter Box: silve box\u003c\/li\u003e\n\u003cli\u003ePlastic Box: PP material\u003c\/li\u003e\n\u003cli\u003eLining: imported high pressure white EVA material\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eManuals \u0026amp; Warranty\u003c\/h3\u003e\n\u003cp\u003eOptolong Warranty\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Optolong","offers":[{"title":"Default Title","offer_id":46422525214949,"sku":"OPT-L-PARA-2","price":361.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/2_97fac2b9-20cb-4b5b-bc95-eb4f7dc3cee3.png?v=1777045161"},{"product_id":"antlia-alp-t-dual-band-sii-oiii-3nm-2-filter","title":"Antlia ALP-T Dual Band SII \u0026 OIII 3nm 2\" Filter","description":"\u003ch1\u003eAntlia ALP-T Dualband 3nm SII + OIII 2'' Filters\u003c\/h1\u003e\n\u003cp\u003eThe Antlia ALP-T Dualband 3nm SII\u0026amp;OIII Filter is a dual narrowband filter, which lets the deep-red SII and the blue-green OIII (500.7nm) lines through and is primarily engineered for color cameras to assist astrophotographers taking deep sky images with superior SNR (Signal to Noise Ratio). With an FWHM half-bandwidth designed at 3nm and achieving an optical density (OD) of 4.5 on unwanted wavelengths, it works strongly in blocking light pollution, moonlight, and airglow, leading to enhanced contrast in nebulae images by effectively passing the SII and OIII emission lines signal only.\u003c\/p\u003e\n\u003cp\u003eThe advanced multi-coatings on Antlia ALP-T dual-band filters effectively isolate the red, SII line, blue-green, OIII line, deep red SII, and the blue H-beta lines from emission nebulae, with almost total suppression of optical density (OD)4.5 on unwanted wavelengths from light pollution, moonlight, and airglow.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMore information coming soon\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical Data:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFWHM: 3nm +0.6\/-0.1nm\u003c\/li\u003e\n\u003cli\u003eFilter Thickness: 2mm+\/-0.05mm\u003c\/li\u003e\n\u003cli\u003eBasic Substrate Optical, Single \/ Non-glued substrate\u003c\/li\u003e\n\u003cli\u003eSurface Quality S\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/li\u003e\n\u003cli\u003eTransmitted Wavefront Lambda\/4 or better. Parallelism less than 30 arcsec\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eFilter Ring:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e2’’ Mounted (M48*0.75 thread)\u003c\/li\u003e\n\u003cli\u003eUltra-thin filter cell to minimize vignetting by maximizing possible clear aperture\u003c\/li\u003e\n\u003cli\u003eBlack Anodized Finish\u003c\/li\u003e\n\u003cli\u003eLaser Engraving, No Fading\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot Recommended:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSolar Observing and imaging\u003c\/li\u003e\n\u003cli\u003eNight visual observation\u003c\/li\u003e\n\u003cli\u003eDO NOT LOOK AT THE SUN WITH ANTLIA FILTERS. Serious eye damage will result if you fail to observe the warning.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003cstrong\u003eNot Permitted:\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eDO NOT LOOK AT THE SUN WITH THIS FILTER DIRECTLY\u003c\/strong\u003e\u003cbr\u003eSerious eye damage will result if you fail to observe the warning.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eMore information coming soon\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAntlia ALP-T Dual Band SII \u0026amp; OIII 3nm 2\" Filter\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWarranty \u0026amp; Manual\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eAntlia 3-Years Warranty against Delamination\u003c\/span\u003e\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":46768609460453,"sku":"AF-ALP-T-2-SIIOIII-3nm","price":554.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/alp-t-2-haoiii-3nm-2.jpg?v=1777043671"},{"product_id":"antlia-alp-t-dual-band-ha-oiii-3nm-sii-hb-3-5nm-2-filter-set-copy","title":"Antlia ALP-T Dual Band Ha \u0026 OIII + SII \u0026 OIII 3nm 2\" Filter Set","description":"\u003ch1\u003eAntlia ALP-T Dual Band Ha \u0026amp; OIII + SII \u0026amp; OIII 3nm 2\" Filter Set\u003c\/h1\u003e\n\u003ch2\u003eHa\u0026amp;OIII 3nm\u003c\/h2\u003e\n\u003cp\u003eThe Antlia ALP-T Dualband 3nm Ha\u0026amp;OIII Filter is a dual narrowband filter, which lets the red H-alpha (656.3nm) and the blue-green OIII (500.7nm) lines through and is primarily engineered for color cameras to assist astrophotographers taking deep sky images with superior SNR (Signal to Noise Ratio). With an FWHM half-bandwidth designed at 3nm and achieving an optical density (OD) of 4.5 on unwanted wavelengths, it works strongly in blocking light pollution, moonlight, and airglow, leading to enhanced contrast in nebulae images by effectively passing the Ha and OIII emission lines signal only.\u003c\/p\u003e\n\u003cp\u003eThe combination of these two dual band Ha\u0026amp;OIII and SII\u0026amp;H-beta filters allows extreme narrow-band images with OSC cameras by capturing the spectral data from 4 channels i.e. Ha\/OIII\/SII\/Hb. The spectrum of these four channels can be separated and recombined into various color palettes in your post-processing. The resulting images can be used for luminance contrast enhancement of traditional RGB-balanced images or the creation of images in various popular false-color palettes such as H-O-Hb, S-H-O, H-S-OHb, H-O-O, etc.\u003c\/p\u003e\n\u003cp\u003eThe advanced multi-coatings on Antlia ALP-T dual-band filters effectively isolate the red, Ha line, blue-green, OIII line, deep red SII, and the blue H-beta lines from emission nebulae, with almost total suppression of optical density (OD)4.5 on unwanted wavelengths from light pollution, moonlight, and airglow. The result is that both the ALP-T dual band Ha\u0026amp;OIII version and SII\u0026amp;OIII version create a superior signal-to-noise ratio and better contrast in your OSC images whether used in urban or rural areas, making them excellent choices for astrophotographers aiming to capture high-quality and more detailed celestial images.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMain features and application:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePasses OIII 500.7nm and H-alpha 656.3nm lines\u003c\/li\u003e\n\u003cli\u003eCapturing of the two main emission wavebands in the red and blue-green at the same time\u003c\/li\u003e\n\u003cli\u003eUltra FWHM 3nm design allows for increasing exposure time and capturing detailed nebulae signal\u003c\/li\u003e\n\u003cli\u003eDesigned to be used primarily with color cameras to capture cleaner data or used as Luminance filter mono cameras to save imaging time\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eSNR( signal-to-noise) and better isolation between the 4 channels\u003c\/li\u003e\n\u003cli\u003eSuppression of optical density (OD)4.5 on unwanted wavelengths adds signal-to-noise\u003c\/li\u003e\n\u003cli\u003eNear IR (NIR) is blocked up to 1100nm\u003c\/li\u003e\n\u003cli\u003eIdeal flat-top and moderate bandpass reducing spectrum downshifts\u003c\/li\u003e\n\u003cli\u003eRecommended to use the filter with optics f-ratios slower than f\/4 for best performance, for optics faster than f\/4, pre-shifted highspeed version is a better choice\u003c\/li\u003e\n\u003cli\u003eIon Gun Assisted Deposition of double-sided multi-layer coating technology on the double-sided polished substrate making it the most consistent and accurate light pollution suppression filter\u003c\/li\u003e\n\u003cli\u003eHalo suppression anti-reflective coating is used to minimize halo and internal reflections\u003c\/li\u003e\n\u003cli\u003eDesigned to suppress artificial lighting from Bortle scale 1 to Bortle scale 8\u003c\/li\u003e\n\u003cli\u003eBlackened edges of unmounted sizes to minimize internal reflections\u003c\/li\u003e\n\u003cli\u003eAntlia's ever-trusted coating technology makes its durability very reliable\u003c\/li\u003e\n\u003cli\u003eWhile primarily designed for use with color cameras, the filter is also highly effective with monochrome cameras to save imaging time\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical Data:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFWHM: 3nm +0.6\/-0.1nm\u003c\/li\u003e\n\u003cli\u003eCWL (Central Wavelength):\n\u003cul\u003e\n\u003cli\u003eHydrogen-alpha: 656.3nm\u003c\/li\u003e\n\u003cli\u003eOxygen III: 500.7nm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003ePeak Transmission:\n\u003cul\u003e\n\u003cli\u003eHydrogen-alpha: 90%\u003c\/li\u003e\n\u003cli\u003eOxygen III: 82%\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003eBlocking: ≥OD4.5 @ 300-1100nm\u003c\/li\u003e\n\u003cli\u003eFilter Thickness: 2mm+\/-0.05mm\u003c\/li\u003e\n\u003cli\u003eBasic Substrate Optical, Single \/ Non-glued substrate\u003c\/li\u003e\n\u003cli\u003eSurface Quality S\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/li\u003e\n\u003cli\u003eTransmitted Wavefront Lambda\/4 or better. Parallelism less than 30 arcsec\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eFilter Ring:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e2’’ Mounted (M48*0.75 thread)\u003c\/li\u003e\n\u003cli\u003eUltra-thin filter cell to minimize vignetting by maximizing possible clear aperture\u003c\/li\u003e\n\u003cli\u003eBlack Anodized Finish\u003c\/li\u003e\n\u003cli\u003eLaser Engraving, No Fading\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSII\u0026amp;OIII 3nm Filter\u003c\/h2\u003e\n\u003cp\u003eThe Antlia ALP-T Dualband 3nm SII\u0026amp;OIII Filter is a dual narrowband filter, which lets the deep-red SII and the blue-green OIII (500.7nm) lines through and is primarily engineered for color cameras to assist astrophotographers taking deep sky images with superior SNR (Signal to Noise Ratio). With an FWHM half-bandwidth designed at 3nm and achieving an optical density (OD) of 4.5 on unwanted wavelengths, it works strongly in blocking light pollution, moonlight, and airglow, leading to enhanced contrast in nebulae images by effectively passing the SII and OIII emission lines signal only.\u003c\/p\u003e\n\u003cp\u003eThe advanced multi-coatings on Antlia ALP-T dual-band filters effectively isolate the red, SII line, blue-green, OIII line, deep red SII, and the blue H-beta lines from emission nebulae, with almost total suppression of optical density (OD)4.5 on unwanted wavelengths from light pollution, moonlight, and airglow.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMore information coming soon\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical Data:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFWHM: 3nm +0.6\/-0.1nm\u003c\/li\u003e\n\u003cli\u003eFilter Thickness: 2mm+\/-0.05mm\u003c\/li\u003e\n\u003cli\u003eBasic Substrate Optical, Single \/ Non-glued substrate\u003c\/li\u003e\n\u003cli\u003eSurface Quality S\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/li\u003e\n\u003cli\u003eTransmitted Wavefront Lambda\/4 or better. Parallelism less than 30 arcsec\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eFilter Ring:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e2’’ Mounted (M48*0.75 thread)\u003c\/li\u003e\n\u003cli\u003eUltra-thin filter cell to minimize vignetting by maximizing possible clear aperture\u003c\/li\u003e\n\u003cli\u003eBlack Anodized Finish\u003c\/li\u003e\n\u003cli\u003eLaser Engraving, No Fading\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot Recommended:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSolar Observing and imaging\u003c\/li\u003e\n\u003cli\u003eNight visual observation\u003c\/li\u003e\n\u003cli\u003eDO NOT LOOK AT THE SUN WITH ANTLIA FILTERS. Serious eye damage will result if you fail to observe the warning.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003cstrong\u003eNot Permitted:\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eDO NOT LOOK AT THE SUN WITH THIS FILTER DIRECTLY\u003c\/strong\u003e\u003cbr\u003eSerious eye damage will result if you fail to observe the warning.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical Data:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFWHM: 3.5nm +0.5\/-0.5nm\u003c\/li\u003e\n\u003cli\u003eCWL (Central Wavelength):\n\u003cul\u003e\n\u003cli\u003eSulfur-II: 672.4nm\u003c\/li\u003e\n\u003cli\u003eHydrogen-Beta: 486.1nm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003ePeak Transmission:\n\u003cul\u003e\n\u003cli\u003eSulfur-II: 90%\u003c\/li\u003e\n\u003cli\u003eHydrogen-Beta: 85%\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003eBlocking: ≥OD4.5 @ 300-1100nm\u003c\/li\u003e\n\u003cli\u003eFilter Thickness: 2mm+\/-0.05mm\u003c\/li\u003e\n\u003cli\u003eBasic Substrate Optical, Single \/ Non-glued substrate\u003c\/li\u003e\n\u003cli\u003eSurface Quality S\/D (scratch\/dig)= 60\/40 (Refer to MIL-O-13830)\u003c\/li\u003e\n\u003cli\u003eTransmitted Wavefront Lambda\/4 or better. Parallelism less than 30 arcsec\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eFilter Ring:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e2’’ Mounted (M48*0.75 thread)\u003c\/li\u003e\n\u003cli\u003eUltra-thin filter cell to minimize vignetting by maximizing possible clear aperture\u003c\/li\u003e\n\u003cli\u003eBlack Anodized Finish\u003c\/li\u003e\n\u003cli\u003eLaser Engraving, No Fading\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot Recommended:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSolar Observing and imaging\u003c\/li\u003e\n\u003cli\u003eNight visual observation\u003c\/li\u003e\n\u003cli\u003eDO NOT LOOK AT THE SUN WITH ANTLIA FILTERS. Serious eye damage will result if you fail to observe the warning.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003cstrong\u003eNot Permitted:\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eDO NOT LOOK AT THE SUN WITH THIS FILTER DIRECTLY\u003c\/strong\u003e\u003cbr\u003eSerious eye damage will result if you fail to observe the warning.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eAntlia ALP-T Dualband 3nm Ha\u0026amp;OIII Filter \u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable cellspacing=\"0\" border=\"0\"\u003e\n\u003ccolgroup width=\"187\"\u003e\u003c\/colgroup\u003e \u003ccolgroup width=\"152\"\u003e\u003c\/colgroup\u003e \u003ccolgroup width=\"144\"\u003e\u003c\/colgroup\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"\"}'\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"Hydrogen-alpha\"}'\u003eHydrogen-alpha\u003c\/td\u003e\n\u003ctd align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"Oxygen III\"}'\u003eOxygen III\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"FWHM\"}'\u003eFWHM\u003c\/td\u003e\n\u003ctd align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"3nm +0.6\\\/-0.1nm \"}'\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003e3nm +0.6\/-0.1nm \u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"3nm +0.6\\\/-0.1nm \"}'\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003e3nm +0.6\/-0.1nm \u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"CWL\"}'\u003eCWL\u003c\/td\u003e\n\u003ctd align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"656.3nm \"}'\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003e656.3nm \u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"500.7nm \"}'\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003e500.7nm \u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"Peak transmission\"}'\u003ePeak transmission\u003c\/td\u003e\n\u003ctd align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 3, \"3\": 0}' data-sheets-numberformat='{ \"1\": 2, \"2\": \"0.00%\", \"3\": 1}'\u003e90.00%\u003c\/td\u003e\n\u003ctd align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 3, \"3\": 0}' data-sheets-numberformat='{ \"1\": 2, \"2\": \"0.00%\", \"3\": 1}'\u003e90.00%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"Blocking\"}'\u003eBlocking\u003c\/td\u003e\n\u003ctd colspan=\"2\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"≥OD4.5 @ 300-1100nm \"}'\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003e≥OD4.5 @ 300-1100nm \u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"Filter thickness\"}'\u003eFilter thickness\u003c\/td\u003e\n\u003ctd colspan=\"2\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"2mm+\\\/-0.05mm \"}'\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003e2mm+\/-0.05mm \u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"Basic Substrate\"}'\u003eBasic Substrate\u003c\/td\u003e\n\u003ctd colspan=\"2\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"Optical, Single \\\/ Non-glued substrate \"}'\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eOptical, Single \/ Non-glued substrate \u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"40\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"Surface Quality\"}'\u003eSurface Quality\u003c\/td\u003e\n\u003ctd colspan=\"2\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"S\\\/D (scratch\\\/dig)= 60\\\/40 (Refer to MIL-O- \"}'\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eS\/D (scratch\/dig)= 60\/40 (Refer to MIL-O- \u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"Transmitted Wavefront\"}'\u003eTransmitted Wavefront\u003c\/td\u003e\n\u003ctd colspan=\"2\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"Lambda\\\/4 or better. \"}'\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eLambda\/4 or better. \u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"Parallelism\"}'\u003eParallelism\u003c\/td\u003e\n\u003ctd colspan=\"2\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"less than 30 arcsec \"}'\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eless than 30 arcsec \u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"21\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"Filter Ring\"}'\u003eFilter Ring\u003c\/td\u003e\n\u003ctd colspan=\"2\" align=\"center\" valign=\"middle\" data-sheets-value='{ \"1\": 2, \"2\": \"2’’ (M48*0.75) \"}'\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003e2’’ (M48*0.75) \u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp class=\"western\" align=\"left\"\u003e\u003cspan style=\"font-family: Arial, sans-serif;\"\u003e\u003cspan style=\"font-size: small;\"\u003e\u003cspan lang=\"en-US\"\u003e\u003cb\u003eAntlia ALP-T dualband 3.5nm SII \u0026amp; OIII Filter\u003c\/b\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"western\" align=\"left\"\u003e\u003cspan style=\"font-family: Arial, sans-serif;\"\u003e\u003cspan style=\"font-size: small;\"\u003e\u003cspan lang=\"en-US\"\u003e\u003cb\u003e\u003cstrong\u003eMore information coming soon\u003c\/strong\u003e\u003c\/b\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAntlia ALP-T Dualband 3nm Ha\u0026amp;OIII Filter 2''\u003c\/li\u003e\n\u003cli\u003eAntlia ALP-T Dualband 3nm SII\u0026amp;OIII Filter 2\"\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWarranty \u0026amp; Manual\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eAntlia 3-Years Warranty against Delamination\u003c\/span\u003e\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":46768630956261,"sku":"AF-ALP-T-2-HaOIII-SIIOIII-3nm-SET","price":1065.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/alp-t-2-haoiii-3nm-2.jpg?v=1777043671"},{"product_id":"askar-colour-magic-ultra-e1-e2-duo-narrowband-filter","title":"Askar Colour Magic Ultra E1 \u0026 E2 Duo Narrowband Filter","description":"\u003ch1\u003eAskar Colour Magic Ultra E1 \u0026amp; E2 Duo Narrowband Filter\u003c\/h1\u003e\n\u003cp class=\"e_text-8 s_title response-transition\"\u003eAskar newly launched ColourMagic Ultra E1 2” Duo-narrowband Filter, is a professional astrophotography tool specifically designed for deep-sky imaging. The Ultra E1 filter, as the name suggests, has the \"Ultra\" halo control capability. During the filter research and development process, we made a special design optimization for Ultra E1. And in the end, it becomes a special filter with one bandwidth at 3nm and the other bandwidth outside 3nm.\u003c\/p\u003e\n\u003cp class=\"e_text-8 s_title response-transition\"\u003eColourMagic Ultra E 2\" Duo-narrowband filter, is a professional astrophotography tool specifically designed for deep-sky imaging. Except for the traditional Hα+OⅢ Duo-narrowband filter, we innovatively introduced another filter--SⅡ+OⅢ. The ColourMagic Ultra E2 filter is a SII+OIII filter.\u003c\/p\u003e\n\u003cdiv style=\"text-align: start;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/6402603c-690d-4fa4-a926-7cf4f529e1d3_1024x1024.jpg?v=1749844738\" alt=\"\" style=\"float: none;\"\u003e\u003c\/div\u003e\n\u003cdiv class=\"e_box e_box-000 d_gridCell_0 p_gridCell response-transition\"\u003e\n\u003cdiv class=\"ie_fimg\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv class=\"ie_line\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv class=\"reset_style\"\u003e\n\u003cdiv\u003e\n\u003cp\u003eAskar Ultra E1 duo-band filter has an extremely narrow bandwidth, and an ultra-high transmittance over 85% at its center wavelength (500.7nm and 656.6nm). It can effectively eliminate the influence of light pollution. Even if you are in an area seriously affected by light pollution, the pictures taken with the ColourMagic Ultra E 2” Duo-narrowband Filter are still very good.  It is so practical and efficient that you can get astronomical images of high quality with just one duo-band filter and an ordinary astronomical colour camera.\u003c\/p\u003e\n\u003cp\u003eThe ColourMagic Ultra E 2” Duo-narrowband Filter is ideal for photographing emission nebulae, planetary nebulae or supernova remnants. The highly narrow bandwidth of the filter effectively blocks out the effects of light pollution or other distracting factors such as night glow.\u003c\/p\u003e\n\u003cp\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/9d0fe05c-f55f-4195-bca5-a696f3b16b83.jpg?v=1749844804\"\u003e\u003c\/p\u003e\n\u003cp\u003eThe Ultra E filter, as the name suggests, has the \"Ultra\" halo control capability. During the filter research and development process, we made a special design optimization for Ultra E. And in the end, it became a special filter with one bandwidth at 3nm and the other bandwidth outside 3nm.\u003c\/p\u003e\n\u003cp\u003eWhen shooting deep-sky galaxies with colour cameras, a duo-narrowband filter in the Hα and OⅢ bands is often used; whereas with a mono camera, a narrowband filter in the Hα, SⅡ and OⅢ bands is often used, leaving users with colour cameras missing one band of nebula detail. This can be compensated by using ColourMagic Ultra E2 Duo-narrowband filter (OⅢ+SⅡ) mentioned above.\u003c\/p\u003e\n\u003cp\u003eColourMagic Ultra E2 Duo-narrowband filter (OⅢ+SⅡ) has an ultra-high transmittance of over 85% at its center wavelength (500.7nm and 672nm). It can effectively enhance the contrast of your pictures, making it easier to display the details of the stars that otherwise are fairly difficult to spot. In areas with very serious light pollution, this filter can also selectively filter light pollution and cluttered signals through the emission lights of the nebula to achieve the ideal shooting effect.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ch2\u003eColour Magic Ultra E1 OIII \u0026amp; Hα\u003c\/h2\u003e\n\u003cp\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cstrong\u003eE1 General information table\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ctable width=\"84.20%\" cellspacing=\"0\" align=\"center\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cstrong\u003eFWHM\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cstrong\u003e HA:3.7nm±0.3nm\/OIII：4.0±0.3nm\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cstrong\u003eCWL\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cstrong\u003e500.7nm \u0026amp; 656.6nm\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cstrong\u003ePeak transmittance\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cstrong\u003e85%\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cstrong\u003eThickness\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cstrong\u003e1.85 ± 0.05mm\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cstrong\u003eBarrier property\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cstrong\u003e≥OD5 @ 200-1100nm\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cstrong\u003eSurface finish\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cstrong\u003e60\/40\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cstrong\u003eParallelism\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cstrong\u003e30″\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp style=\"text-align: left;\"\u003e \u003c\/p\u003e\n\u003cp style=\"text-align: left;\"\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cstrong\u003eE1 Parameter Diagram\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv style=\"text-align: start;\"\u003e\u003cimg style=\"float: none;\" alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/a6711c5e-d7ec-4aa7-85b6-01a3f41b0290_1024x1024.jpg?v=1749845010\"\u003e\u003c\/div\u003e\n\u003ch2\u003eColour Magic Ultra E2 SII \u0026amp; OIII\u003c\/h2\u003e\n\u003cp\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cstrong\u003eE2 General information table\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ctable width=\"84.20%\" cellspacing=\"0\" align=\"center\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cstrong\u003eFWHM\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cstrong\u003e SII:4.0±0.3nm\/OIII：3.7nm±0.3nm\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cstrong\u003eCWL\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cstrong\u003e500.7nm \u0026amp; 672nm\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cstrong\u003ePeak transmittance\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cstrong\u003e85%\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cstrong\u003eThickness\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cstrong\u003e1.85 ± 0.05mm\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cstrong\u003eBarrier property\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cstrong\u003e≥OD5 @ 200-1100nm\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cstrong\u003eSurface finish\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cstrong\u003e60\/40\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cstrong\u003eParallelism\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cstrong\u003e30″\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cstrong\u003eE2 Parameter Diagram\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv style=\"text-align: start;\"\u003e\u003cimg style=\"margin-bottom: 16px; float: none;\" alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/e06bbb0c-04fd-46d7-b77e-af95b2131ba6_1024x1024.jpg?v=1749845112\"\u003e\u003c\/div\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eE1 OIII \u0026amp; Hα 2'' Filter \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eor\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eE2  SII \u0026amp; OIII 2'' Filter\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eor \u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eE1 + E2 2'' Filter Kit\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWarranty \u0026amp; Manuals\u003c\/h3\u003e\n\u003cp\u003eAskar Warranty\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Askar","offers":[{"title":"Colour Magic E1 (OIII \u0026 Hα)","offer_id":46842191380709,"sku":"ASK-CM-E1","price":859.0,"currency_code":"CAD","in_stock":true},{"title":"Colour Magic E2 (SII \u0026 OIII)","offer_id":46842191413477,"sku":"ASK-CM-E2","price":859.0,"currency_code":"CAD","in_stock":true},{"title":"Colour Magic E1 + E2 Filter Package","offer_id":46842191446245,"sku":"ASK-CM-E1+E2","price":1679.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/E1_E2.webp?v=1749845786"},{"product_id":"baader-h-alpha-bandpass-filter-20-nm","title":"Baader H-alpha Bandpass Filter (20 nm)","description":"\u003ch1\u003eBaader H-alpha Bandpass Filter (20 nm)\u003c\/h1\u003e\n\u003cdiv class=\"station-tabs-content is-active\" aria-hidden=\"false\" aria-labelledby=\"st-link-description_0-0\"\u003e\n\u003cdiv class=\"station-tabs-content-inner\"\u003e\n\u003cul\u003e\n\u003cli\u003eH-alpha filter with 20 nm FWHM (CWL 656.3 nm), thus excellently suited for visual use at night- and photographically with CCD and CMOS cameras at telescopes with all f-ratios. \u003cstrong\u003eWarning: this filter alone is not suitable for direct viewing of the sun!\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eWith new, highly effective UV\/IR block coating from 300 nm to 1400 nm\u003c\/li\u003e\n\u003cli\u003eSimilar to the Super G filter in O III, the 20 nm H-alpha filter is an outstanding high-contrast deep-sky H-alpha\/red filter for RGB applications, optimised for all colour CCD and CMOS chips. It enables high-contrast images of H-II regions (e.g. North America nebulae) even from light-polluted environments.\u003c\/li\u003e\n\u003cli\u003eFront-Reflex-BlockerTM hard coated and planeoptically polished- with sealed coating edges (Life-CoatTM)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eH-alpha Bandpass-Filter (20 nm)\u003c\/h2\u003e\n\u003cp\u003eThis 20nm filter replaces the former 35nm H-alpha filter, which was developed for interline CCD cameras. Due to advances in sensor technology, now much narrower filters can be used with colour sensors.\u003c\/p\u003e\n\u003cp\u003eCompared to the CMOS-optimized Baader (Ultra) Narrowband Filters, the 20 nm H-alpha filter passes considerably more light. This makes the stars in the image brighter, allowing easier focusing, and the filter can be used at all focal ratios: There is no need for preshifting as with narrow band filters. This filter is especially interesting for users of colour cameras (which are less sensitive to red than monochrome cameras) who do not need extreme narrowband filters and want to enrich their colour images with H-alpha. At the same time this filter is a valid alternative to a standard R-filter of the RGB-scheme. It blocks much more of deteriorating light pollution and still passes all H-alpha for all focal ratios.\u003c\/p\u003e\n\u003cp\u003eA notable difference to all H-alpa pass filters on the market is the fact that this filter does include highly efficient UV\/IR blocking. being completely blocked out to 1400 nm, to eliminate blurring (\"heat-noise\") caused by defocused light on refractor optics.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThe Baader H-alpha Bandpass Filter also offers all the advantages of the CMOS-optimized Baader filters:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eIncreased contrast, matched for typical CMOS quantum efficiency and s\/n ratio\u003c\/li\u003e\n\u003cli\u003eReflex-BlockerTM coatings, for largest ever freedom from halos, even under most adverse conditions concerning aux-optics\u003c\/li\u003e\n\u003cli\u003eIdentical filter thickness to existing standards, with utmost care for parfocality\u003c\/li\u003e\n\u003cli\u003eBlackened edges all around, with filter-lead-side-indicator in the form of a black frontside outer rim, to additionally eliminate any reflection due to light falling onto the edge of a filter\u003c\/li\u003e\n\u003cli\u003eEach filter coated individually, with sealed coating edge (NOT cut out of a larger plate with coatings left exposed, read more)\u003c\/li\u003e\n\u003cli\u003eLife-CoatTM: evermore hard coatings to enable a non-aging coating for life- even in a most adverse environment\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp\u003e1.25\"\u003c\/p\u003e\n\u003ctable id=\"product-attribute-specs-table\" class=\"data-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003eMANUFACTURER\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eBaader Planetarium\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003eSKU (#)\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2961850\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003eEAN CODE\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e4047825053824\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003eNET WEIGHT (KG)\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e0.06\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003eTRANSMISSION RANGE\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eH-alpha\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003eFILTER THICKNESS (WITHOUT CELL)\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e2 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003eHBW (HALFBANDWIDTH)\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e20nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003eCWL (CENTRAL WAVELENGTH)\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e656,3 nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003eAR-COATING\u003c\/th\u003e\n\u003ctd class=\"data\"\u003edielectrically coated, planeoptically polished\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003eFILTER SIZE\u003c\/th\u003e\n\u003ctd class=\"data\"\u003e1 25 inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003eFILTER USAGE\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eCMOS, CCD, H-alpha, IR-Cut\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003eFILTER MOUNTED\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eMounted (LPFC 6mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003eTYPE OF FILTER\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eNarrowband\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003eSINGLE OR SET?\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eSingle Filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth class=\"label\"\u003eFILTER SHAPE\u003c\/th\u003e\n\u003ctd class=\"data\"\u003eround\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e2\"\u003c\/p\u003e\n\u003ctable style=\"width: 99.9768%; height: 333.2px;\" id=\"product-attribute-specs-table\" class=\"data-table\"\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003cth style=\"width: 35.6551%; height: 19.6px;\" class=\"label\"\u003eMANUFACTURER\u003c\/th\u003e\n\u003ctd style=\"width: 61.1334%; height: 19.6px;\" class=\"data\"\u003eBaader Planetarium\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003cth style=\"width: 35.6551%; height: 19.6px;\" class=\"label\"\u003eSKU (#)\u003c\/th\u003e\n\u003ctd style=\"width: 61.1334%; height: 19.6px;\" class=\"data\"\u003e2961853\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003cth style=\"width: 35.6551%; height: 19.6px;\" class=\"label\"\u003eEAN CODE\u003c\/th\u003e\n\u003ctd style=\"width: 61.1334%; height: 19.6px;\" class=\"data\"\u003e4047825053831\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003cth style=\"width: 35.6551%; height: 19.6px;\" class=\"label\"\u003eNET WEIGHT (KG)\u003c\/th\u003e\n\u003ctd style=\"width: 61.1334%; height: 19.6px;\" class=\"data\"\u003e0.012\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003cth style=\"width: 35.6551%; height: 19.6px;\" class=\"label\"\u003eTRANSMISSION RANGE\u003c\/th\u003e\n\u003ctd style=\"width: 61.1334%; height: 19.6px;\" class=\"data\"\u003eH-alpha\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.2px;\"\u003e\n\u003cth style=\"width: 35.6551%; height: 39.2px;\" class=\"label\"\u003eFILTER THICKNESS (WITHOUT CELL)\u003c\/th\u003e\n\u003ctd style=\"width: 61.1334%; height: 39.2px;\" class=\"data\"\u003e2 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003cth style=\"width: 35.6551%; height: 19.6px;\" class=\"label\"\u003eHBW (HALFBANDWIDTH)\u003c\/th\u003e\n\u003ctd style=\"width: 61.1334%; height: 19.6px;\" class=\"data\"\u003e20nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003cth style=\"width: 35.6551%; height: 19.6px;\" class=\"label\"\u003eCWL (CENTRAL WAVELENGTH)\u003c\/th\u003e\n\u003ctd style=\"width: 61.1334%; height: 19.6px;\" class=\"data\"\u003e656,3 nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.2px;\"\u003e\n\u003cth style=\"width: 35.6551%; height: 39.2px;\" class=\"label\"\u003eAR-COATING\u003c\/th\u003e\n\u003ctd style=\"width: 61.1334%; height: 39.2px;\" class=\"data\"\u003eReflex-BlockerTM hard coated, dielectrically coated, planeoptically polished\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003cth style=\"width: 35.6551%; height: 19.6px;\" class=\"label\"\u003eFILTER SIZE\u003c\/th\u003e\n\u003ctd style=\"width: 61.1334%; height: 19.6px;\" class=\"data\"\u003e2 inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003cth style=\"width: 35.6551%; height: 19.6px;\" class=\"label\"\u003eFILTER USAGE\u003c\/th\u003e\n\u003ctd style=\"width: 61.1334%; height: 19.6px;\" class=\"data\"\u003eCMOS, CCD, H-alpha, IR-Cut\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003cth style=\"width: 35.6551%; height: 19.6px;\" class=\"label\"\u003eFILTER MOUNTED\u003c\/th\u003e\n\u003ctd style=\"width: 61.1334%; height: 19.6px;\" class=\"data\"\u003eMounted (LPFC 6mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003cth style=\"width: 35.6551%; height: 19.6px;\" class=\"label\"\u003eTYPE OF FILTER\u003c\/th\u003e\n\u003ctd style=\"width: 61.1334%; height: 19.6px;\" class=\"data\"\u003eNarrowband\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003cth style=\"width: 35.6551%; height: 19.6px;\" class=\"label\"\u003eSINGLE OR SET?\u003c\/th\u003e\n\u003ctd style=\"width: 61.1334%; height: 19.6px;\" class=\"data\"\u003eSingle Filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003cth style=\"width: 35.6551%; height: 19.6px;\" class=\"label\"\u003eFILTER SHAPE\u003c\/th\u003e\n\u003ctd style=\"width: 61.1334%; height: 19.6px;\" class=\"data\"\u003eround\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cp\u003e-Baader H-alpha Bandpass Filter (20 nm)\u003c\/p\u003e\n\u003ch3\u003eWarranty \u0026amp; Manual\u003c\/h3\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/istronomyplus.com\/pages\/baader-warranty\" rel=\"noopener\" target=\"_blank\"\u003eBaader 2-Year Warranty\u003c\/a\u003e\u003cbr\u003e\u003ca rel=\"noopener\" title=\"FAQ\" href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/faq_problems_with_filters_can_have_the_strangest_causes.pdf?v=1749932737\" target=\"_blank\"\u003eProblems with filters can have the strangest causes\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Baader Planetarium","offers":[{"title":"1.25\"","offer_id":46846271979749,"sku":"BAA-FHALW-1 (Baader #2961850)","price":137.0,"currency_code":"CAD","in_stock":true},{"title":"2\"","offer_id":46846272012517,"sku":"BAA-FHALW-2 (Baader #2961853)","price":241.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/h-alpha-bandpass-filter-20-nm-58d_1783x1945_c2aa5349-52ba-48a7-a4bc-49c6c9048e39.webp?v=1749932669"},{"product_id":"svbony-narrowband-filter-3nm-h-alpha-oiii-sv220-w9198","title":"SVBony SV220 3nm Narrowband Filter Ha \u0026 OIII","description":"\u003ch1\u003eNarrowband Filter 3nm H-Alpha \u0026amp; Oiii SV220\u003c\/h1\u003e\n\u003cul\u003e\n\u003cli\u003eUltra-narrow 3nm (H-Alpha \u0026amp; OIII) bandwidth, ideal for photographing emission and planetary nebulae;\u003c\/li\u003e\n\u003cli\u003eMinimal halo coating design, effectively blocking excess light and reducing halos;\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003ePerfectly compatible with full-frame telescopes and cameras.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/w9198b_20250828175857_7509.jpg?v=1757778172\" alt=\"\"\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003eMinimal Halo Coating Design\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eThis narrowband filter Adopts multi-layer minimal halo coating technology, it reduces glare and halo interference. It thereby enhances image contrast and color accuracy, presents sharp celestial details against a clean background, and improves the purity of deep-sky photography images.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/w9198b-1_20250828175909_6166.jpg?v=1757778197\" alt=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/w9198b-3_20250828175937_5948.jpg?v=1757778242\" alt=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eTechnical Specifications\u003c\/span\u003e\u003c\/h3\u003e\n\u003ctable style=\"width: 100.079%;\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 26.5775%;\"\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth style=\"width: 40.2255%;\"\u003e\u003cstrong\u003e2-inch Version\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth style=\"width: 32.5635%;\"\u003e\u003cstrong\u003e1.25-inch Version\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 26.5775%;\"\u003e\u003cstrong\u003eBandwidth \/ FWHM (H‑α \u0026amp; OIII)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 40.2255%;\"\u003e~3 nm (ultra‑narrow)\u003c\/td\u003e\n\u003ctd style=\"width: 32.5635%;\"\u003e~3 nm ±1 nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 26.5775%;\"\u003e\u003cstrong\u003eThread Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 40.2255%;\"\u003eM48 × 0.75\u003c\/td\u003e\n\u003ctd style=\"width: 32.5635%;\"\u003eM28.5 × 0.6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 26.5775%;\"\u003e\u003cstrong\u003eBarrel \/ Filter Cell Outside Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 40.2255%;\"\u003eØ50.8 × 7 mm\u003c\/td\u003e\n\u003ctd style=\"width: 32.5635%;\"\u003eØ31.75 × 7 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 26.5775%;\"\u003e\u003cstrong\u003eOptical Cut‑off \/ Transmission Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 40.2255%;\"\u003e300 nm – 1050 nm\u003c\/td\u003e\n\u003ctd style=\"width: 32.5635%;\"\u003e300 nm – 1050 nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 26.5775%;\"\u003e\u003cstrong\u003eBlocking \/ Out‑of‑Band Suppression\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 40.2255%;\"\u003eAverage OD5 (0.001 %)\u003c\/td\u003e\n\u003ctd style=\"width: 32.5635%;\"\u003eAverage OD5 (0.001 %)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 26.5775%;\"\u003e\u003cstrong\u003ePeak Transmission at Target Lines\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 40.2255%;\"\u003e≥85 % at H‑α \u0026amp; OIII\u003c\/td\u003e\n\u003ctd style=\"width: 32.5635%;\"\u003e≥85 % at H‑α \u0026amp; OIII\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 26.5775%;\"\u003e\u003cstrong\u003eCoating \/ Halo Control\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 40.2255%;\"\u003eMulti-layer, anti-reflection, minimal halo design\u003c\/td\u003e\n\u003ctd style=\"width: 32.5635%;\"\u003eMulti-layer, anti-reflection, minimal halo design\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 26.5775%;\"\u003e\u003cstrong\u003eDesign Notes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 40.2255%;\"\u003eSuitable for full-frame sensors; minimal vignetting; optimized for light pollution control and enhanced nebula contrast\u003c\/td\u003e\n\u003ctd style=\"width: 32.5635%;\"\u003eSame features apply; best performance with slower focal ratios (not ultra-fast optics)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli data-start=\"171\" data-end=\"303\"\u003e\n\u003cp data-start=\"173\" data-end=\"303\"\u003e\u003cstrong data-start=\"173\" data-end=\"226\"\u003eSVBONY SV220 3 nm Dual-Band H‑Alpha \u0026amp; OIII Filter\u003c\/strong\u003e\u003cbr data-start=\"226\" data-end=\"229\"\u003e– Available in either \u003cstrong data-start=\"253\" data-end=\"269\"\u003e2-inch (M48)\u003c\/strong\u003e or \u003cstrong data-start=\"273\" data-end=\"294\"\u003e1.25-inch (M28.5)\u003c\/strong\u003e format\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"304\" data-end=\"402\"\u003e\n\u003cp data-start=\"306\" data-end=\"402\"\u003e\u003cstrong data-start=\"306\" data-end=\"341\"\u003eProtective Plastic Storage Case\u003c\/strong\u003e\u003cbr data-start=\"341\" data-end=\"344\"\u003e– Foam-lined interior for secure storage and transport\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"403\" data-end=\"499\"\u003e\n\u003cp data-start=\"405\" data-end=\"499\"\u003e\u003cstrong data-start=\"405\" data-end=\"434\"\u003eMicrofiber Cleaning Cloth\u003c\/strong\u003e\u003cbr data-start=\"434\" data-end=\"437\"\u003e– For safe and scratch-free cleaning of the filter surface\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"500\" data-end=\"600\"\u003e\n\u003cp data-start=\"502\" data-end=\"600\"\u003e\u003cstrong data-start=\"502\" data-end=\"543\"\u003eUser Information Card or Basic Manual\u003c\/strong\u003e\u003cbr data-start=\"543\" data-end=\"546\"\u003e– Filter handling tips and specifications overview\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eWarranty \u0026amp; Manual\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003e\u003ca rel=\"noopener\" href=\"https:\/\/istronomyplus.com\/pages\/svbony-warranty\" target=\"_blank\"\u003eSvbony 1-Year Warranty \u003c\/a\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Svbony","offers":[{"title":"1.25\"","offer_id":47669861810405,"sku":"SVB-W9198A","price":167.0,"currency_code":"CAD","in_stock":true},{"title":"2\"","offer_id":47669861843173,"sku":"SVB-W9198B","price":347.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/1_8994f89f-3f71-4f1b-8045-ce116ed41fe3.jpg?v=1777043747"},{"product_id":"optolong-l1-l-quad-l-para-enhence-filter-set-l1","title":"Optolong L1 L-Quad \u0026 L-Para Enhence Filter Set (L1-SET)","description":"\u003ch1\u003eOptolong L1 L-Quad \u0026amp; L-Para Enhence Filter Set\u003c\/h1\u003e\n\u003cp\u003eL1 Dual -Combo Set includes：one L-Quad Enhance Filter and one L-Para L-Quad Enhance Filter：Quad bandpass broadband filter , This filter provides better color balance while improving resistance of light pollution. It is suitable for a wide range of imaging targets, including continuous spectrum objects (RGB) such as nebulae, galaxies, and star clusters. This filter maximizes the preservation of RGB color balance in broadband spectrum targets like nebulae and galaxies, effectively improving con \u003c\/p\u003e\n\u003ch2\u003e\u003ca rel=\"noopener\" href=\"https:\/\/istronomyplus.com\/products\/optolong-l-enhance-filter?_pos=4\u0026amp;_sid=08b680de8\u0026amp;_ss=r\" target=\"_blank\"\u003eL-Quad Enhance Filter\u003c\/a\u003e\u003c\/h2\u003e\n\u003cp\u003eQuad bandpass broadband filter ,  This filter provides better color balance while improving resistance of light pollution. It is suitable for a wide range of imaging targets, including continuous spectrum objects (RGB) such as nebulae, galaxies, and star clusters. This filter maximizes the preservation of RGB color balance in broadband spectrum targets like nebulae and galaxies, effectively improving contrast and detail to render subjects more vivid and three-dimensional.\u003c\/p\u003e\n\u003cdiv style=\"text-align: left;\"\u003e\u003cimg style=\"float: none;\" alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/dbeae9d38c40e5c4742bd4ce3bc3eddf_1024x1024.jpg?v=1758301649\"\u003e\u003c\/div\u003e\n\u003ch2\u003e\u003ca href=\"https:\/\/istronomyplus.com\/products\/optolong-l-para-10nm-dual-narrowband-light-pollution-filter-lpar-200?_pos=2\u0026amp;_sid=08b680de8\u0026amp;_ss=r\" rel=\"noopener\" target=\"_blank\"\u003eL-Para\u003c\/a\u003e\u003c\/h2\u003e\n\u003cp\u003eA dual narrowband 10nm filter  ,in systems with a focal ratio of F2 and above, the transmittance of nebula emission lines OIII and Ha exceed 85%, with excellent contrast and Anti-Halo characteristics . This filter suitable for all telescope systems, adaptable to fast optics (focal ratios of F2, F2.8, F3.2, F4) as well as various standard\/normal focal ratio telescopes. Ideal for capturing Hα \u0026amp; OIII signals in celestial objects, this filter enhances image contrast and reveals richer details in Hα \u0026amp; OIII emissions.\u003c\/p\u003e\n\u003cdiv style=\"text-align: left;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/9b96104f725faacefa9ded926bfab8da_70c51161-6868-41ef-89ce-6603d4232bf9_1024x1024.png?v=1758301713\" alt=\"\" style=\"float: none;\"\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align: left;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/2700143340459da0e3aa3e900c9c60f4_d78ac1cf-a484-4232-ab8c-af8e272a4efa_1024x1024.png?v=1758301754\" alt=\"\" style=\"margin-bottom: 16px; float: none;\"\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align: left;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/ec92b95b51a57afdfb563adfcf710c88_5fb714e0-720c-485c-a1cc-0fc1cb431ece_1024x1024.png?v=1758301769\" alt=\"\" style=\"margin-bottom: 16px; float: none;\"\u003e\u003c\/div\u003e\n\u003ch2\u003e1+1\u0026gt;2 features\u003c\/h2\u003e\n\u003cp\u003e“Broadband + Narrowband” synergy engineered for precision and colour fidelity,achieves precise signal capture and color optimization for astrophotography\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan style=\"text-decoration: underline;\"\u003e\u003cstrong\u003eL-Quad Enhance Filter:\u003c\/strong\u003e\u003c\/span\u003e Quad bandpass broadband filter captures the RGB signals of celestial targets\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan style=\"text-decoration: underline;\"\u003e\u003cstrong\u003eL-Para :\u003c\/strong\u003e\u003c\/span\u003e Dual narrowband 10nm filter selectively acquires Hα and OIII emission lines, revealing fine filamentary structures and the detailed morphology of ionised gas in deep-sky objects. After post-processing,photographers can effortlessly obtain fused images combining RGB with Hα \u0026amp; OIII data. This \"Broadband-Narrowband Synergy\" solution delivers more vibrant color rendition while accentuating subtle signal details, unlocking innovative approaches for astrophotography and enhancing the creative possibilities of color camera imaging. It pioneers new artistic dimensions, transforming the deep-sky photography process into a more technically engaging and visually rewarding experience.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eCoating Technology\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eMulti-layers anti-reflection coating\u003c\/li\u003e\n\u003cli\u003eNon-cementing optical substrate coating\u003c\/li\u003e\n\u003cli\u003eOptolong filter adopts precision coating based on Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL(central wavelength) no deviation affected by temperature change.\u003c\/li\u003e\n\u003cli\u003ePlanetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and Optical density of off-band.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ch2\u003eL-Quad Enhance 2\"\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSubstrate\u003c\/td\u003e\n\u003ctd\u003eB270\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThickness\u003c\/td\u003e\n\u003ctd\u003e1.85 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePeak Transmission (Tpeak)\u003c\/td\u003e\n\u003ctd\u003eT \u0026gt; 90%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking Range\u003c\/td\u003e\n\u003ctd\u003e300 – 1000 nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking Depth\u003c\/td\u003e\n\u003ctd\u003eLight pollution line blocking \u0026gt; 99%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurface Quality\u003c\/td\u003e\n\u003ctd\u003e60\/40\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmitted Wavefront (RMS)\u003c\/td\u003e\n\u003ctd\u003eλ\/4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParallelism\u003c\/td\u003e\n\u003ctd\u003e30″\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cdiv style=\"text-align: start;\"\u003e\u003cimg style=\"float: none;\" alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/dbeae9d38c40e5c4742bd4ce3bc3eddf_1024x1024.jpg?v=1758301649\"\u003e\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2\u003eL-Para 2\"\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eFeature\u003c\/th\u003e\n\u003cth\u003eInfo\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBroad Compatibility\u003c\/td\u003e\n\u003ctd\u003eWorks with all telescope systems, including fast optics (F2–F4)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLight Pollution Resistance\u003c\/td\u003e\n\u003ctd\u003eBlocks mercury, sodium, LED lines; effective under Bortle 1–7 skies\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHigh Transmission Rate\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;85% for OIII \u0026amp; Hα (at F2 and above)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExcellent Contrast\u003c\/td\u003e\n\u003ctd\u003eHigh nebula transmission + strong light pollution cut-off\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAnti-Halo Characteristics\u003c\/td\u003e\n\u003ctd\u003eOptimized design, tested for improved anti-halo on bright stars\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cdiv style=\"text-align: start;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/9b96104f725faacefa9ded926bfab8da_70c51161-6868-41ef-89ce-6603d4232bf9_1024x1024.png?v=1758301713\" alt=\"\" style=\"float: none;\"\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align: start;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/2700143340459da0e3aa3e900c9c60f4_d78ac1cf-a484-4232-ab8c-af8e272a4efa_1024x1024.png?v=1758301754\" alt=\"\" style=\"float: none;\"\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align: start;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/ec92b95b51a57afdfb563adfcf710c88_5fb714e0-720c-485c-a1cc-0fc1cb431ece_1024x1024.png?v=1758301769\" alt=\"\" style=\"float: none;\"\u003e\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cstrong\u003eHow to read the chart?\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e▲The horizontal axis is the Wavelength in Nanometers(nm).\u003c\/p\u003e\n\u003cp\u003e▲The vertical axis is transmission in %.\u003c\/p\u003e\n\u003ctable style=\"width: 100.044%; height: 78.4px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"height: 39.2px;\"\u003e\n\u003cth style=\"width: 40.0348%; height: 39.2px;\"\u003eThe Major Emission Lines of Nebulae\u003c\/th\u003e\n\u003cth style=\"width: 56.8783%; height: 39.2px;\"\u003eThe Major Emission Lines of Artificial Light Pollution\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"width: 40.0348%; height: 19.6px;\"\u003eH-α 656.3 nm  H-β 486.1 nm\u003c\/td\u003e\n\u003ctd style=\"width: 56.8783%; height: 19.6px;\"\u003eHg 435.8 nm  546.1 nm  577 nm  578.1 nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"width: 40.0348%; height: 19.6px;\"\u003eOIII 495.9 nm  OIII 500.7 nm\u003c\/td\u003e\n\u003ctd style=\"width: 56.8783%; height: 19.6px;\"\u003eNa 598 nm  589.6 nm  615.4 nm  616.1 nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003eL-Quad Enhence Filter - 2\"\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003eL-Para Filter - 2\"\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eManuals \u0026amp; Warranty\u003c\/h3\u003e\n\u003cp\u003eOptolong Warranty\u003c\/p\u003e","brand":"Optolong","offers":[{"title":"Default Title","offer_id":47759264579813,"sku":"OPT-L1-SET","price":557.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/Optolong-L1-Dual-Combo-Set_1200x1200_9dc91923-6a0e-4cd2-ae46-30fb0d90f7fb.webp?v=1758302755"},{"product_id":"svbony-sv260-multi-bandpass-filter-w9194a","title":"SVBONY SV260 Multi-Bandpass Filter (W9194A)","description":"\u003ch1\u003eSVBONY SV260 Multi-Bandpass Filter\u003c\/h1\u003e\n\u003cp data-start=\"18\" data-end=\"462\"\u003eSV260 multi‑broadband filter is a 5‑bandpass light pollution filter for deep‑sky photography, galaxies, reflection nebulae, starfields and more Single‑thread 2‑inch format with M48×0.75 mounting Substrate thickness 2 mm Clear aperture 44 mm Wavelength range 300‑1000 nm Peak transmittance ≈ 90% Blocks many common light pollution and emission lines OD4 cut‑off in UV and IR regions Also strong blocking at Hg, Na and in the near infrared region\u003c\/p\u003e\n\u003ch3 data-start=\"464\" data-end=\"494\"\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cdiv class=\"_tableContainer_1rjym_1\"\u003e\n\u003cdiv class=\"group _tableWrapper_1rjym_13 flex w-fit flex-col-reverse\"\u003e\n\u003ctable data-start=\"495\" data-end=\"987\" class=\"w-fit min-w-(--thread-content-width)\"\u003e\n\u003cthead data-start=\"495\" data-end=\"521\"\u003e\n\u003ctr data-start=\"495\" data-end=\"521\"\u003e\n\u003cth data-start=\"495\" data-end=\"511\" data-col-size=\"sm\"\u003eSpecification\u003c\/th\u003e\n\u003cth data-start=\"511\" data-end=\"521\" data-col-size=\"lg\"\u003eDetail\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody data-start=\"532\" data-end=\"987\"\u003e\n\u003ctr data-start=\"532\" data-end=\"556\"\u003e\n\u003ctd data-start=\"532\" data-end=\"546\" data-col-size=\"sm\"\u003eFilter Size\u003c\/td\u003e\n\u003ctd data-start=\"546\" data-end=\"556\" data-col-size=\"lg\"\u003e2‑inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"557\" data-end=\"587\"\u003e\n\u003ctd data-start=\"557\" data-end=\"579\" data-col-size=\"sm\"\u003eSubstrate Thickness\u003c\/td\u003e\n\u003ctd data-start=\"579\" data-end=\"587\" data-col-size=\"lg\"\u003e2 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"588\" data-end=\"614\"\u003e\n\u003ctd data-start=\"588\" data-end=\"605\" data-col-size=\"sm\"\u003eClear Aperture\u003c\/td\u003e\n\u003ctd data-start=\"605\" data-end=\"614\" data-col-size=\"lg\"\u003e44 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"615\" data-end=\"649\"\u003e\n\u003ctd data-start=\"615\" data-end=\"634\" data-col-size=\"sm\"\u003eWavelength Range\u003c\/td\u003e\n\u003ctd data-start=\"634\" data-end=\"649\" data-col-size=\"lg\"\u003e300‑1000 nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"650\" data-end=\"680\"\u003e\n\u003ctd data-start=\"650\" data-end=\"671\" data-col-size=\"sm\"\u003ePeak Transmittance\u003c\/td\u003e\n\u003ctd data-start=\"671\" data-end=\"680\" data-col-size=\"lg\"\u003e~ 90%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"681\" data-end=\"863\"\u003e\n\u003ctd data-start=\"681\" data-end=\"710\" data-col-size=\"sm\"\u003eOD Blocking Specifications\u003c\/td\u003e\n\u003ctd data-start=\"710\" data-end=\"863\" data-col-size=\"lg\"\u003e\u0026gt;OD4 @ 350‑400 nm • \u0026gt;OD2 @ Hg 589 nm, 435.8 nm • \u0026gt;OD2 @ Na 589.6 nm • \u0026gt;OD1 @ Hg 546.1 nm • \u0026gt;OD2 @ Na 615.4 nm • \u0026gt;OD3 @ Hg 577 nm • \u0026gt;OD4 @ 720‑1100 nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"864\" data-end=\"891\"\u003e\n\u003ctd data-start=\"864\" data-end=\"882\" data-col-size=\"sm\"\u003eSurface Quality\u003c\/td\u003e\n\u003ctd data-start=\"882\" data-end=\"891\" data-col-size=\"lg\"\u003e60\/40\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"892\" data-end=\"923\"\u003e\n\u003ctd data-start=\"892\" data-end=\"914\" data-col-size=\"sm\"\u003eSurface Parallelism\u003c\/td\u003e\n\u003ctd data-start=\"914\" data-end=\"923\" data-col-size=\"lg\"\u003e1\/2 λ\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"924\" data-end=\"961\"\u003e\n\u003ctd data-start=\"924\" data-end=\"933\" data-col-size=\"sm\"\u003eThread\u003c\/td\u003e\n\u003ctd data-start=\"933\" data-end=\"961\" data-col-size=\"lg\"\u003eM48 × 0.75 single thread\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"962\" data-end=\"987\"\u003e\n\u003ctd data-start=\"962\" data-end=\"975\" data-col-size=\"sm\"\u003eNet Weight\u003c\/td\u003e\n\u003ctd data-start=\"975\" data-end=\"987\" data-col-size=\"lg\"\u003e~ 12.5 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3 data-start=\"989\" data-end=\"1005\"\u003eIn the Box\u003c\/h3\u003e\n\u003cul data-start=\"1006\" data-end=\"1045\"\u003e\n\u003cli data-start=\"1006\" data-end=\"1045\"\u003e\n\u003cp data-start=\"1008\" data-end=\"1045\"\u003eSV260 Multi‑broadband filter (2‑inch)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3\u003eWarranty \u0026amp; Manual\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003e\u003ca href=\"https:\/\/istronomyplus.com\/pages\/svbony-warranty\" rel=\"noopener\" target=\"_blank\"\u003eSvbony 1-Year Warranty \u003c\/a\u003e\u003c\/span\u003e\u003c\/p\u003e","brand":"Svbony","offers":[{"title":"Default Title","offer_id":47762874106085,"sku":"SVB-W9194A","price":174.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/w9194a-1_20250908104958_7694.jpg?v=1777043755"},{"product_id":"ioptron-sii-narrowband-filter-1-25","title":"iOptron SHO Narrowband Filter 1.25\"","description":"\u003ch1\u003eiOptron SHO Narrowband Filter 1.25\"\u003c\/h1\u003e\n\u003cp\u003e\u003cstrong\u003eInformation for HA:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eiOptron H-Alpha 7nm filter is the popular narrowband filter allowing 7nm bandwidth of light centered on a wavelength of 656nm through, and reducing the transmission of certain wavelengths of light, specifically those produced by artificial light including mercury vapor, and both high and low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow). Better choice of narrowband H-alpha astrophotography filter for highest contrast and revealing subtle nebula details.\u003c\/p\u003e\n\u003cp\u003eH-alpha filter is the first narrowband addition to LRGB set for most imagers who blend a black-and-white Ha image into RGB data to enhance structural detail while maintaining natural look.\u003c\/p\u003e\n\u003cdiv\u003eNarrowband filter do not eliminate the effects of light pollution or increase the object’s brightness. In many cases, they increase the contrast between nebula and night sky, not brightening the nebula.\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eInformation for SII:\u003c\/strong\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eAn improved narrowband SII filter (Sulful II for CCD) is designed for nebula observation. The filter isolates the light at the wavelength of 672nm. It allows it to pass through and reduces the transmission of certain wavelengths of light, specifically those produced by artificial light including mercury vapor, and both high and low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow).\u003c\/p\u003e\n\u003cp\u003eNarrowband filter do not eliminate the effects of light pollution or increase the object’s brightness. In many cases, they increase the contrast between nebula and night sky, not brightening the nebula.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eInformation for OIII:\u003c\/strong\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv\u003eAn improved narrowband OIII filter is designed for nebula observation. The filter isolates the 500.7 nm and 495.9 nm wavelengths of light. It allows them pass through and reduces the transmission of certain wavelengths of light, specifically those produced by artificial light including mercury vapor, and both high and low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow).\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eOIII emits 495.9nm and 500.7nm and it is a blue-green colored filter. Many of images of planetary nebula and supernova remnants are taken only with H-alpha and OIII filters. They show great structural details, but have natural colors, looking like an RGB image.\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eNarrowband filter do not eliminate the effects of light pollution or increase the object’s brightness. In many cases, they increase the contrast between nebula and night sky, not brightening the nebula.\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eWARNING\u003c\/strong\u003e: iOptron filters are not designed for direct solar observation. NEVER use these filters for observing or imaging the Sun, or permanent eye and equipment damage will result.\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eTechnical Specifications\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eInformation for SHO:\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eValue \/ Requirement\u003c\/th\u003e\n\u003cth\u003eNotes \/ Examples\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounted Diameter\u003c\/td\u003e\n\u003ctd\u003e1.25″\u003c\/td\u003e\n\u003ctd\u003eCompatible with a 1.25″ filter wheel \u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStandard Thread\u003c\/td\u003e\n\u003ctd\u003eM28.5 × 0.6\u003c\/td\u003e\n\u003ctd\u003eThis is the standard thread for 1.25″ filters in astronomy\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUsable with Eyepiece\u003c\/td\u003e\n\u003ctd\u003eYes (1.25″ eyepiece)\u003c\/td\u003e\n\u003ctd\u003eThe mount is compatible with a 1.25″ eyepiece\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoating\u003c\/td\u003e\n\u003ctd\u003eMulti‑layer anti‑reflection\u003c\/td\u003e\n\u003ctd\u003eTo maximize transmission\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurface Quality (scratch\/dig)\u003c\/td\u003e\n\u003ctd\u003e60\/40\u003c\/td\u003e\n\u003ctd\u003eGood optical standard\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurface Flatness\u003c\/td\u003e\n\u003ctd\u003e\u0026lt; λ\/4\u003c\/td\u003e\n\u003ctd\u003eTo limit aberrations\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParallelism\u003c\/td\u003e\n\u003ctd\u003e≤ 30″ (arcseconds)\u003c\/td\u003e\n\u003ctd\u003eTypical value for high‑quality filters\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003e\u003c\/h3\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cp\u003eiOptron SII Narrowband Filter -1.25\"\u003c\/p\u003e\n\u003cp\u003eor\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eiOptron OIII Narrowband Filter -1.25\"\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eor\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eiOptron H-Alpha Narrowband Filter -1.25\"\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003eWarranty \u0026amp; Manuals\u003c\/h3\u003e\n\u003cp\u003e\u003ca rel=\"noopener\" href=\"https:\/\/istronomyplus.com\/pages\/ioptron-warranty\" target=\"_blank\"\u003eiOptron Warranty\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"iOptron","offers":[{"title":"H-Alpha","offer_id":47771444740325,"sku":"IOP-3383-Ha","price":209.0,"currency_code":"CAD","in_stock":true},{"title":"Sulfer II","offer_id":47771444773093,"sku":"IOP-3383-SII","price":209.0,"currency_code":"CAD","in_stock":true},{"title":"Oxygen III","offer_id":47771444805861,"sku":"IOP-3383-OIII","price":209.0,"currency_code":"CAD","in_stock":true},{"title":"SHO Filter Set","offer_id":47771444838629,"sku":"IOP-3383-SET","price":627.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/3383-Ha.webp?v=1758740388"},{"product_id":"colour-magic-3nm-narrowband-filter","title":"Askar SHO Colour Magic 3nm Deep-sky 2\" Narrowband Filters","description":"\u003ch1 class=\"e_h1-99 s_subtitle response-transition\"\u003eAskar SHO Colour Magic 3nm Deep-sky Narrowband Filters \u003c\/h1\u003e\n\u003cp class=\"e_text-102 s_title response-transition\"\u003eThe ColourMagic 3nm Deep-sky Narrowband Filter Series is specially designed for astrophotography, comprising three filters—Hα, SⅡ, and OⅢ—to help you overcome environmental limitations and capture pristine, detailed cosmic views.\u003c\/p\u003e\n\u003cp class=\"e_text-102 s_title response-transition\"\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/1_cfbe25c6-bf88-409e-bb42-72f2f6f4cd2f.jpg?v=1759334320\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFilters are essential tools for every deep-sky astrophotographer, effectively suppressing light pollution and enhancing image contrast to reveal celestial targets with greater clarity and intricate detail.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe ColourMagic 3nm Narrowband Filter features an extremely narrow bandwidth and excellent transmittance, allowing you to capture high-contrast, low-noise deep-sky images even in areas affected by urban light pollution, atmospheric airglow, or other stray light sources.   This makes faint nebula structures and subtle stellar details—often difficult to reveal—easily visible.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFurthermore, the ColourMagic filter incorporates an optimized optical design for improved halo control, ensuring higher image quality and enhancing the overall expressive power of your astrophotography.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/2_0b7fa9a5-5b1d-4106-8414-dc015c05c278.jpg?v=1759334346\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eColourMagic 3nm SII Filter\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe ColourMagic SII Narrowband Filter has a center wavelength of 672nm and also offers over 90% high transmittance.   It is specifically designed to capture emission nebulae, planetary nebulae, and supernova remnants that emit SII light.   \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe deep red emission from SII differs distinctly from the surrounding H-alpha radiation, revealing different structural details in each region.   Thanks to its 3nm narrow bandwidth and high light transmission, the ColourMagic SII filter significantly boosts image contrast and enhances the definition of celestial structures.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eColourMagic 3nm H-alpha Filter\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe ColourMagic H-alpha filter is an ideal choice for capturing nebulae and supernova remnants containing H-alpha emissions.   It has a center wavelength of 656.5nm with over 90% peak transmittance, its 3nm ultra-narrow bandwidth effectively blocks light pollution and airglow.   \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eEven in heavily light-polluted areas, it delivers high-contrast images, while under dark skies, it further enhances the structural detail and tonal depth of your targets.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eColourMagic 3nm OIII Filter\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe ColourMagic OIII Narrowband Filter is well-suited for imaging objects emitting OIII light, with a center wavelength of 500.7nm and over 90% transmittance.   \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eIts 3nm narrow bandwidth effectively blocks light pollution and airglow, ensuring clean, high-contrast images in a variety of shooting conditions.   Additionally, the filter's specially optimized optical construction helps suppress halos， resulting in finer, more rounded star images.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications \u003c\/h3\u003e\n\u003ctable width=\"84.20%\" cellspacing=\"0\" align=\"center\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"3\"\u003e\n\u003cp\u003e\u003cstrong\u003e3nm SII Filter 2”\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eFWHM\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e\n\u003cp\u003e\u003cstrong\u003e3.7±0.2nm\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eCWL\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e\n\u003cp\u003e\u003cstrong\u003e672nm\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003ePeak transmittance\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e\n\u003cp\u003e\u003cstrong\u003e85%\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eThickness\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e\n\u003cp\u003e\u003cstrong\u003e1.85 ± 0.05mm\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eBarrier property\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e\n\u003cp\u003e\u003cstrong\u003e≥OD5 @ 200-1100nm\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eSurface finish\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e\n\u003cp\u003e\u003cstrong\u003e60\/40\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eParallelism\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e\n\u003cp\u003e\u003cstrong\u003e30″\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/3_bef5eb05-c1ac-4f54-a419-d286a6d6818d.png?v=1759334542\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/4_f8f253e1-e1a0-4791-a7cc-6e8fb0638593.png?v=1759334555\"\u003e\u003c\/p\u003e\n\u003ctable width=\"84.20%\" cellspacing=\"0\" align=\"center\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"3\"\u003e\n\u003cp\u003e\u003cstrong\u003e3nm H-alpha 2”\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eFWHM\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e\n\u003cp\u003e\u003cstrong\u003e3.7±0.2nm\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eCWL\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e\n\u003cp\u003e\u003cstrong\u003e656.6nm\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003ePeak transmittance\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e\n\u003cp\u003e\u003cstrong\u003e85%\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eThickness\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e\n\u003cp\u003e\u003cstrong\u003e1.85 ± 0.05mm\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eBarrier property\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e\n\u003cp\u003e\u003cstrong\u003e≥OD5 @ 200-1100nm\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eSurface finish\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e\n\u003cp\u003e\u003cstrong\u003e60\/40\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eParallelism\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e\n\u003cp\u003e\u003cstrong\u003e30″\u003c\/strong\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3 style=\"text-align: start;\"\u003e\u003cbr\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/5_0821a321-8c83-499a-8efb-7067ce63b516.png?v=1759334611\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/6_3633e019-e263-42b8-9ce0-fac66aeba7d7.png?v=1759334628\"\u003e\u003c\/p\u003e\n\u003ctable width=\"84.20%\" cellspacing=\"0\" align=\"center\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"3\"\u003e\n\u003cp\u003e\u003cstrong\u003e3nm OIII 2”\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eFWHM\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e\n\u003cp\u003e\u003cstrong\u003e3.7±0.2nm\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eCWL\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e\n\u003cp\u003e\u003cstrong\u003e500.7nm\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003ePeak transmittance\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e\n\u003cp\u003e\u003cstrong\u003e85%\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eThickness\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e\n\u003cp\u003e\u003cstrong\u003e1.85 ± 0.05mm\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eBarrier property\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e\n\u003cp\u003e\u003cstrong\u003e≥OD5 @ 200-1100nm\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eSurface finish\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e\n\u003cp\u003e\u003cstrong\u003e60\/40\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eParallelism\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e\n\u003cp\u003e\u003cstrong\u003e30″\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3 style=\"text-align: start;\"\u003e\u003cbr\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/7_51750655-882f-4e07-8973-963589074a1e.png?v=1759334653\"\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/8_6cf6e1bc-dbf9-4781-8ef0-41ef59637c0b.png?v=1759334663\"\u003e\u003c\/p\u003e\n\u003ch3 style=\"text-align: start;\"\u003eIn the box\u003c\/h3\u003e\n\u003cp\u003eColour Magic 3nm Deep-sky Narrowband Filter Sulfer II\u003c\/p\u003e\n\u003cp\u003eor\u003c\/p\u003e\n\u003cp\u003eColour Magic 3nm Deep-sky Narrowband Filter H-Alpha\u003c\/p\u003e\n\u003cp\u003eor\u003c\/p\u003e\n\u003cp\u003eColour Magic 3nm Deep-sky Narrowband Filter Oxygen III\u003c\/p\u003e\n\u003cdiv style=\"text-align: start;\"\u003e\n\u003ch3\u003eWarranty \u0026amp; Manuals\u003c\/h3\u003e\n\u003cp\u003eAskar Warranty\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cp class=\"e_text-102 s_title response-transition\"\u003e \u003c\/p\u003e","brand":"Askar","offers":[{"title":"H-Alpha","offer_id":47797121548517,"sku":"ASK-CM-Ha","price":622.0,"currency_code":"CAD","in_stock":true},{"title":"Sulfer II","offer_id":47797121581285,"sku":"ASK-CM-SII","price":623.0,"currency_code":"CAD","in_stock":true},{"title":"Oxygen III","offer_id":47797121614053,"sku":"ASK-CM-OIII","price":622.0,"currency_code":"CAD","in_stock":true},{"title":"SHO Filter Set","offer_id":47797121646821,"sku":"ASK-CM-SHO","price":1867.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/S1_208b6095-5296-4b1f-b7e6-589833da2ca4.webp?v=1759334855"},{"product_id":"optolong-dual-narrow-band-filter","title":"Optolong 2\" L-Synergy 7nm Dual NarrowBand Filter (L-SYNERGY)","description":"\u003ch1\u003eOptolong 2\" L-Synergy 7nm Dual NarrowBand Filter (SII and OIII) \u003c\/h1\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eOptolong L-Synergy is a dual 7nm narrowband filter compatible with DSLR cameras, color CMOS sensors, and CCD cameras, supporting telescope systems with F-ratio of F3.3 or above (slower system）. Its key advantage lies in enabling astrophotography amateurs to capture exceptionally detailed emission nebulae even in light-polluted environments.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAfter years of technical refinement, it has been optimized to minimize bright star halos while isolating all emission lines except SII and OIII, achieving maximum effective transmission.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eOptolong L-Synergy's advantage lies in its selective transmission of only the nebula emission lines OIII (500.7nm) and SII (672.4nm), while blocking all other light-polluting emission lines. This ensures that only the signals from oxygen and sulfur elements are captured during imaging, resulting in a darker sky background and significantly enhanced contrast and signal-to-noise ratio (SNR) between nebulae.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eEven in heavily light-polluted areas, this filter selectively transmits nebula emission lines while filtering out light pollution, ultimately eliminating its impact on astrophotography.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eOptical Design\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eBy analyzing the spectral characteristics of both celestial emission lines and light pollution, L-Synergy selectively preserves the SII and OIII nebula colors while filtering out the majority of light pollution. Specifically designed and optically optimized, L-Synergy maintains consistently high transmission across both SII and OIII bands. This ensures users can precisely capture the target nebula emissions, delivering optimal astrophotography results.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/1_6c99d215-26fa-4dec-97c7-8587f8169a0d.png?v=1759336984\" alt=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eHow to read the chart?\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e▲The horizontal axis is the Wavelength in Nanometers(nm).\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e▲The vertical axis is transmission in %.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/2_260beffd-fac7-43c0-bb8f-39371fce8576.jpg?v=1759337078\" alt=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eCoating Technology\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e·Multi-layers anti-reflection coating\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e·Non-cementing optical substrate coating\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e·Optolong filter adopts precision coating based on Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL(central wavelength) no deviation affected by temperature change.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e·Planetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and Optical density of off-band.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/3_96f41837-73c5-433f-bd12-d0b744ffe11b.jpg?v=1759337244\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eL-Synergy Filter Performance\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eI. WR134 in the Cygnus constellation © Gianni Lacroce\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eTest with the new Optolong L-sinergy filter, a 7nm S2 O3 dual-band filter, and \u003cu\u003eI have to say I really liked it.\u003c\/u\u003e\u003cbr\u003eI chose to photograph WR134 in the constellation Cygnus.\u003cbr\u003eHaving shot in monochrome, which usually results in a significant amount of signal with an H-alpha filter, the O3 is there, but sometimes I have to integrate a lot to bring it out; the S2 isn't there at all. So I thought, ‘There won't be all that much signal; to take a decent photo, I'll have to integrate a lot,’ and that's why I took 200 5-minute shots.\u003cbr\u003eOnce I'd processed the photo, I found it came out of the WBPP \u003cu\u003ewithout gradients or halos\u003c\/u\u003e, but above all, bicolour, meaning full of S2 and lots and lots of O3, and I find this wonderful. I didn't have to do anything else in processing except stretch the image, balance contrast, highlights, and tones to customise it a bit, but in the end, it was already like this in the raw file.\u003cbr\u003e\u003cu\u003eThis filter greatly simplifies post-production.\u003c\/u\u003e\u003cbr\u003eI'll also show you the Starless Nebula to help you understand the signal and the O3 it produces.\u003cbr\u003eMore shots of this new filter will follow soon.\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan\u003eEQUIPMENT\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003eImaging Telescope: Newton Tecnosky Carbon 200\u003cbr\u003eImaing CameraZwo Asi 2600 duo  \u003cbr\u003eMount: Zwo Am5\u003cbr\u003eOptolong \u003cu\u003e\u003cstrong\u003eL-Synergy\u003c\/strong\u003e\u003c\/u\u003e filters\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003cspan\u003e\u003cstrong\u003ePHOTOS\u003c\/strong\u003e\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003etemp 0 with dark, flat and darkflat\u003cbr\u003e200 x 300s  \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003ePROCESSING\u003c\/strong\u003e\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003ePixinsight\u003cbr\u003ePhotoshop\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/4_152b9ecb-fc58-47ca-a2fb-7e7df52da8a3.jpg?v=1759337273\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/5_4c31f387-a3f9-431b-858c-0e46f3b60fd1.jpg?v=1759337308\"\u003e\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications \u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003e2\"（M48×0.75）\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 style=\"text-align: start;\"\u003eIn the box\u003c\/h3\u003e\n\u003cp\u003eOptolong L-Synergy dual-narrow band filter (SII and OIII)\u003c\/p\u003e\n\u003ch3\u003eManuals \u0026amp; Warranty\u003c\/h3\u003e\n\u003cp\u003eOptolong Warranty\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Optolong","offers":[{"title":"Default Title","offer_id":47797222342885,"sku":"OPT-L-SYNERGY","price":431.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/S1_b7cee943-c691-408d-b79e-b5b5febe8a96.jpg?v=1777043771"},{"product_id":"svbony-sv220-narrowband-filter-7nm-sii-oiii-for-astrophotography-1-25inch-w9172c","title":"Svbony SV220 7nm Dual-Band Nebula Filter SII \u0026 OIII (1.25” \/ 2”)","description":"\u003ch1\u003e\n\u003cmeta charset=\"utf-8\"\u003eSvbony SV220 7nm Dual-Band Nebula Filter SII \u0026amp; OIII\u003c\/h1\u003e\n\u003cp\u003e\u003cspan\u003eThe SV220 SII \u0026amp; OIII  7nm is a Duo Band Filter. It is designed to be used in combination with the SV220 H-Alpha \u0026amp; OIII Duo Band Filter to provide a superior method for achieving the SHO (Hubble Pallet) narrow band colour balance with colour imaging cameras. The SII and OIII Filter provides the missing band data so that owners of colour cameras can achieve the SHO colour balance in their narrow band images. The Duo-band filter (SII+OIII) has a high transmission of over 85% at its center wavelength (500.7nm and 672nm). It can effectively improve the quality of the image by making the sky background of the image darker while maximizing contrast throughout the image and enhancing the contrast of your pictures, thus making it easier to display the details of the stars. In areas with very serious light pollution, this filter can also selectively filter light pollution.\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003e\u003cstrong\u003e1.25inch SII+OIII Dual-Band Filter\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/1_3ff89093-9901-4d8d-94a0-b491a9932cb2.webp?v=1763152174\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/2_73570da8-e555-41d0-9492-0764546b59c5.webp?v=1763152186\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/3_9ca6757d-620b-4857-bdfe-235b1704f981.webp?v=1763152200\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/4_88f8d051-aea1-4273-8785-5a3f8b09a509.webp?v=1763152214\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/5_c1d5f6c8-a2a9-4f2a-90f6-0f1c67d21f82.webp?v=1763152227\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/6_1f2fdcfc-13f3-4e4a-8cb9-64fb346590f2.webp?v=1763152244\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/7_b5151030-b2c3-489d-80e5-824edcc1c795.webp?v=1763152260\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/8_46a0929a-bf5a-48d3-93d0-f556b0b7cda2.webp?v=1763152271\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/9_a104fbca-983e-40b4-9d7f-8007988e4913.webp?v=1763152280\"\u003e\u003c\/span\u003e\u003cspan\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/10_59521ee9-b87a-4be8-a95e-8a0de620e0cf.webp?v=1763152296\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003e\u003cstrong\u003e2 inch SII+OIII Dual-Band Filter\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/1_45e60788-8bad-45e3-910d-98c761936df9.webp?v=1763155185\"\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/2_c652fea8-bd26-4f54-9d9f-54ea4bab0dfb.webp?v=1763155256\"\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/3_65bcf700-84c2-4491-9f4f-60c7c7965577.webp?v=1763155265\"\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/4_27318d54-d87e-40cd-8e3b-7f118d9f2dd1.webp?v=1763155275\"\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/5_02887b4e-53aa-4a96-83c4-0e058aedd49f.webp?v=1763155287\"\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/6_efa1126b-e233-44bc-be58-b2b4d3170bed.webp?v=1763155300\"\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/9_c9c52fec-b568-4591-8fe8-6d4e659d0ed4.webp?v=1763155325\"\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003e2-Inch Specification\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003e1.25-Inch Specification\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eSV220\u003c\/td\u003e\n\u003ctd\u003eSV220\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eName\u003c\/td\u003e\n\u003ctd\u003eSII \u0026amp; OIII Duo-Band OSC Filter\u003c\/td\u003e\n\u003ctd\u003eSII \u0026amp; OIII Duo-Band OSC Filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSize\u003c\/td\u003e\n\u003ctd\u003e2-Inch\u003c\/td\u003e\n\u003ctd\u003e1.25-Inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSubstrate Thickness\u003c\/td\u003e\n\u003ctd\u003e1.85 mm\u003c\/td\u003e\n\u003ctd\u003e1.80 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClear Aperture\u003c\/td\u003e\n\u003ctd\u003e44 mm\u003c\/td\u003e\n\u003ctd\u003e26 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWavelength Range\u003c\/td\u003e\n\u003ctd\u003e300–1000 nm\u003c\/td\u003e\n\u003ctd\u003e300–1000 nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFWHM\u003c\/td\u003e\n\u003ctd\u003e7 nm\u003c\/td\u003e\n\u003ctd\u003e7 nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking\u003c\/td\u003e\n\u003ctd\u003e≥OD5\u003c\/td\u003e\n\u003ctd\u003e≥OD5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePeak Transmittance\u003c\/td\u003e\n\u003ctd\u003e≥88%\u003c\/td\u003e\n\u003ctd\u003e≥88%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurface Quality\u003c\/td\u003e\n\u003ctd\u003e60\/40\u003c\/td\u003e\n\u003ctd\u003e60\/40\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurface Parallelism\u003c\/td\u003e\n\u003ctd\u003e1\/2λ\u003c\/td\u003e\n\u003ctd\u003e1\/2λ\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThread\u003c\/td\u003e\n\u003ctd\u003eM48x0.75\u003c\/td\u003e\n\u003ctd\u003eM28.5x0.6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSingle Thread\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet Weight\u003c\/td\u003e\n\u003ctd\u003e15–20 g\u003c\/td\u003e\n\u003ctd\u003e7 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cp\u003eSVBONY SV220 Narrowband Filter\u003c\/p\u003e\n\u003ch3\u003eManuals \u0026amp; Warranty\u003c\/h3\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/istronomyplus.com\/pages\/svbony-warranty\" target=\"_blank\"\u003eSvbony 1-Year Warranty \u003c\/a\u003e\u003c\/p\u003e","brand":"Svbony","offers":[{"title":"7nm SII \u0026 OIII 1.25”","offer_id":48085246902501,"sku":"SVB-W9172C","price":138.0,"currency_code":"CAD","in_stock":true},{"title":"7nm SII \u0026 OIII 2”","offer_id":48085246935269,"sku":"SVB-W9172D","price":235.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/S2_3a4bf24d-4265-46ee-92e1-d2485c66a9dd.webp?v=1763153429"},{"product_id":"antlia-8-el-uhc-pro-visual-enhancer-filter-2-mounted","title":"Antlia 8-EL UHC Pro Visual Enhancer Filter - 2'' Mounted","description":"\u003ch1\u003eAntlia 8-EL UHC Pro Visual Enhancer Filter - 2'' Mounted\u003c\/h1\u003e\n\u003cp\u003e\u003cspan\u003eThe Antlia 8-EL UHC Pro Visual Enhancer filter is a high-\u003c\/span\u003e\u003cspan\u003e-\u003c\/span\u003e\u003cspan\u003eperformance optical filter designed for visual observation of celestial objects.\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis filter is designed to combat moderate light pollution while maintaining excellent color balance, making it ideal for visual observation\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003eof\u003c\/span\u003e\u003cspan\u003e emission nebulae, planetary nebulae, and other objects. It selectively enhances key emission lines through its high-transmission design, including:\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e95% Peak transmission at 671.6nm (SII)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e95% Peak transmission at 673.1nm (SII)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e95% Peak transmission at 486.1nm (H-beta)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e95% Peak transmission at 495.9nm (OIII)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e95% Peak transmission at 500.7nm (OIII)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e95% Peak transmission at 654.8nm (NII)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e95% Peak transmission at 658.3nm (NII)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e95% Peak transmission at 656.3nm (H-alpha)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e95% Peak transmission at 671.6nm (SII)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e95% Peak transmission at 673.1nm (SII)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe combination of high transmission (\u0026gt;95%) and sodium-light suppression allows observers to perceive fine structural details in Planetary nebula, emission nebula targets, even under moderate light pollution.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg src=\"http:\/\/20564242.s21i.faiusr.com\/4\/2\/ABUIABAEGAAgv-GkvgYooeKorQUwvgo4gQY.png\" alt=\"Spectrum Curve Antlia 8-EL UHC Pro Visual Enhancer Filter.png\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e1. \u003c\/span\u003e\u003cspan\u003eVisual Recommendations\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e1) \u003c\/span\u003e\u003cspan\u003eLarge-Aperture Telescopes: Due to reduced photon capture by the human eye at night\u003c\/span\u003e\u003cspan\u003e，\u003c\/span\u003e\u003cspan\u003ewe recommend using large-aperture telescopes (e.g., 8-inch or larger) to ensure sufficient light throughput. This compensates for the inherent sensitivity drop in low-light conditions while maintaining the filter’s balance between light pollution suppression and target brightness.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e2) \u003c\/span\u003e\u003cspan\u003eVisual Enhanced Contrast in Nebulae:\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e8-EL\u003c\/span\u003e\u003cspan\u003e（\u003c\/span\u003e\u003cspan\u003e8 emission lines) and target recommendations\u003c\/span\u003e\u003c\/p\u003e\n\u003ctable border=\"1\" cellspacing=\"0\" style=\"width: 100%;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd width=\"192\" valign=\"top\" style=\"width: 34.2294%;\"\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eEmission lines\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"404\" valign=\"top\" style=\"width: 65.7706%;\"\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSuggested observation targets\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"192\" valign=\"top\" style=\"width: 34.2294%;\"\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e486.1nm (H-beta)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"404\" valign=\"top\" style=\"width: 65.7706%;\"\u003e\n\u003cp\u003e\u003cspan\u003eM42 Orion Nebula,NGC 7000 North America Nebula,M16 Eagle Nebula, M8 Lagoon Nebula\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"192\" valign=\"top\" style=\"width: 34.2294%;\"\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e495.9nm (OIII)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"404\" valign=\"top\" style=\"width: 65.7706%;\"\u003e\n\u003cp\u003e\u003cspan\u003e-Recommended Nebulae: M57 Ring Nebula,NGC6960 Veil Nebula,NGC6543 Cat's Eye Nebula,NGC6302 Butterfly Nebula\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"192\" valign=\"top\" style=\"width: 34.2294%;\"\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e500.7nm (OIII)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"404\" valign=\"top\" style=\"width: 65.7706%;\"\u003e\n\u003cp\u003e\u003cspan\u003eM42 Orion Nebula, M57 Ring Nebula, NGC 6992 Veil Nebula on the east side, IC 2177 Seagull Nebula, M104 Broad-shouldered Cap Galaxy\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"192\" valign=\"top\" style=\"width: 34.2294%;\"\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e654.8nm (NII)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"404\" valign=\"top\" style=\"width: 65.7706%;\"\u003e\n\u003cp\u003e\u003cspan\u003eNGC 6960 Veil Nebula, M1 Crab Nebula, M57 Ring Nebula, NGC 6543 Cat's Eye Nebula\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"192\" valign=\"top\" style=\"width: 34.2294%;\"\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e658.3nm (NII)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"404\" valign=\"top\" style=\"width: 65.7706%;\"\u003e\n\u003cp\u003e\u003cspan\u003eM42 Orion Nebula, NGC 6960 Veil Nebula, M57 Ring Nebula\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"192\" valign=\"top\" style=\"width: 34.2294%;\"\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e656.3nm (H-alpha)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"404\" valign=\"top\" style=\"width: 65.7706%;\"\u003e\n\u003cp\u003e\u003cspan\u003eM42 Orion Nebula, IC434 Horsehead Nebula, NGC7000 North America Nebula, M16 Eagle Nebula, M8 Lagoon Nebula, NGC6960 Veil Nebula\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"192\" valign=\"top\" style=\"width: 34.2294%;\"\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e671.6nm (SII)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"404\" valign=\"top\" style=\"width: 65.7706%;\"\u003e\n\u003cp\u003e\u003cspan\u003eM42 Orion Nebula, IC434 Horsehead Nebula, M1 Crab Nebula, M16 Eagle Nebula, M57 Ring Nebula, NGC6543 Cat's Eye Nebula\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"192\" valign=\"top\" style=\"width: 34.2294%;\"\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e673.1nm (SII)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"404\" valign=\"top\" style=\"width: 65.7706%;\"\u003e\n\u003cp\u003e\u003cspan\u003eM42 Orion Nebula, M1 Cassiopeia Nebula, NGC 6960 Veil Nebula, IC 443 Jellyfish Nebula, M27 Sundial Nebula\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable style=\"width: 100%; height: 176.344px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003cth style=\"width: 34.8375%; height: 19.5938px;\"\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth style=\"width: 64.8014%; height: 19.5938px;\"\u003e\u003cstrong\u003eDetails\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 34.8375%; height: 19.5938px;\"\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 64.8014%; height: 19.5938px;\"\u003eAntlia\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 34.8375%; height: 19.5938px;\"\u003e\u003cstrong\u003eFilter Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 64.8014%; height: 19.5938px;\"\u003eMulti-band (8 emission lines)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 34.8375%; height: 19.5938px;\"\u003e\u003cstrong\u003eSize\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 64.8014%; height: 19.5938px;\"\u003e2″ Mounted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 34.8375%; height: 19.5938px;\"\u003e\u003cstrong\u003eThread\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 64.8014%; height: 19.5938px;\"\u003eM48 × 0.75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 34.8375%; height: 19.5938px;\"\u003e\u003cstrong\u003ePeak Transmission\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 64.8014%; height: 19.5938px;\"\u003e≥95%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 34.8375%; height: 19.5938px;\"\u003e\u003cstrong\u003eFilter Cell\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 64.8014%; height: 19.5938px;\"\u003eUltra-thin, black anodized aluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 34.8375%; height: 19.5938px;\"\u003e\u003cstrong\u003eMarkings\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 64.8014%; height: 19.5938px;\"\u003eLaser engraved\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 34.8375%; height: 19.5938px;\"\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 64.8014%; height: 19.5938px;\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cimg src=\"http:\/\/20564242.s21i.faiusr.com\/4\/2\/ABUIABAEGAAgv-GkvgYooeKorQUwvgo4gQY.png\" alt=\"Spectrum Curve Antlia 8-EL UHC Pro Visual Enhancer Filter.png\"\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eWarranty\u003c\/h3\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/istronomyplus.com\/pages\/antlia-filters-warranty\" rel=\"noopener\" target=\"_blank\"\u003eAntlia 3-Year Warranty\u003c\/a\u003e\u003c\/p\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":48246449209573,"sku":"AF-8-EL-UHC-Pro-2","price":169.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/ABUIABACGAAg-5mlvgYogOHu7QQw6Ac46Ac.jpg?v=1777043842"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/collections\/light-pollution-and-nebula-filters-astronomy-plus.jpg?v=1677340904","url":"https:\/\/istronomyplus.com\/collections\/light-pollution-filters.oembed?page=2","provider":"Astronomy Plus – Telescopes \u0026 Astrophotography Canada","version":"1.0","type":"link"}