{"title":"Optolong","description":"\u003ch3 data-start=\"92\" data-end=\"126\"\u003e\u003cem\u003e\u003cstrong data-start=\"96\" data-end=\"126\"\u003eOptolong Astronomy Filters\u003c\/strong\u003e\u003c\/em\u003e\u003c\/h3\u003e\n\u003cp data-start=\"128\" data-end=\"429\"\u003e\u003cstrong data-start=\"128\" data-end=\"169\"\u003e\u003cspan class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\"\u003e\u003cspan class=\"whitespace-normal\"\u003eOptolong\u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003e produces high-quality narrowband and light pollution filters designed for astrophotography. Known for excellent transmission and strong contrast, Optolong filters help enhance nebula detail and improve imaging results under both dark and light-polluted skies.\u003c\/p\u003e","products":[{"product_id":"optolong-l-pro-filter","title":"Optolong L-Pro Filter","description":"\u003ch1\u003eOptolong L-Pro Filter\u003c\/h1\u003e\n\u003cp\u003eThe Optolong L-Pro 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). 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 filter is suitable for enhancing the contrast and details for both visual and photograghic purpose at sub-rural area with heavy light pollution.\u003c\/p\u003e\n\u003cp\u003eOptolong L-Pro is multi-bandpass filter which offers better color balance by maximizing the transmission band. The balanced transmission allows astrophotos to be taken with minimal color cast to broadband emission objects such as galaxies, reflection nebulae and globular star clusters. L-Pro is the best choice for light pollution suppression.\u003c\/p\u003e\n\u003ch4\u003eMain Use and Performance\u003c\/h4\u003e\n\u003cp\u003eSuitable for visual observation and astrophotography.\u003c\/p\u003e\n\u003cp\u003eL-Pro filter has a very low transmission reduction rate against continuous spectrum space objects, and thus is quite effective in suppressing light pollution sources when shooting galaxies, reflection nebulae and globular star clusters. The same holds true for visual star observations.\u003c\/p\u003e\n\u003cp\u003eL-Pro filter alone can suppress infrared wavelength, and thus can be used at ease for “L” image shootings with CCDs.\u003c\/p\u003e\n\u003cp\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\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\u003eSchott substrate material\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eThickness 2.0 mm (1.25”\/2”\/77mm) | 1.0 mm (Clip series)\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eSurface Quality: 60\/40 (Refer to MIL-O-13830)\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eFine-optically polished to ensure accurate 1\/4 wavefront and \u0026lt; 30 seconds parallelism over the both surfaces\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eHigh transmission at major nebula emission lines (i.e. H-alpha 656nm, OIII 496nm\u0026amp;500nm, SII 672nm and H-beta 486nm).\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003ePrecision off-band blocking, specifically the major emission lines of artificial light pollution (i.e. Na 589nm, Hg 435nm and 578nm).\u003c\/span\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSONY COMPATIBILITY (pre-2023) :\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eOptolong Sony-FF clip filter available for below camera body:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA7M\/ A7M2\/ A7M3、A7R\/ A7R2\/ A7R3、A7S\/ A7S2\/ A7S3、A9\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eApplicable Lenses: Full range of E-mount main and auxiliary lens  \u003c\/strong\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 L-Pro 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\u003eIn the Box\u003cbr\u003e\n\u003c\/h3\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eL-Pro Filter\u003c\/p\u003e\n\u003ch3\u003eManual \u0026amp; Warranty\u003c\/h3\u003e\n\u003cp\u003eOptolong 3-Years Warranty\u003c\/p\u003e","brand":"Optolong","offers":[{"title":"1.25\" Mounted","offer_id":43697571135717,"sku":"OL-L-PRO-1.25","price":208.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Mounted","offer_id":43697571168485,"sku":"OL-L-PRO-2","price":278.0,"currency_code":"CAD","in_stock":true},{"title":"Clip for Canon EOS APS-C","offer_id":43697571201253,"sku":"OL-L-PRO-EOS-APS-C","price":349.0,"currency_code":"CAD","in_stock":true},{"title":"Clip for Canon EOS Full Frame","offer_id":43697571234021,"sku":"OL-L-PRO-EOS-FF","price":377.0,"currency_code":"CAD","in_stock":true},{"title":"Clip for Nikon Z full frame","offer_id":48076843188453,"sku":"OL-L-PRO-NK-Z","price":349.0,"currency_code":"CAD","in_stock":true},{"title":"Clip for Nikon Full Frame","offer_id":43697571266789,"sku":"OL-L-PRO-NK-FF","price":377.0,"currency_code":"CAD","in_stock":true},{"title":"Sony Full Frame (2023 Version) \/ Check compatibility","offer_id":43697571332325,"sku":"OL-L-PRO-SN-FF","price":250.0,"currency_code":"CAD","in_stock":true},{"title":"EOS-R","offer_id":46339805970661,"sku":"","price":349.0,"currency_code":"CAD","in_stock":true},{"title":"77mm Round Mounted","offer_id":43697571299557,"sku":"OL-L-PRO-77","price":405.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/optolong-l-pro-filter-astronomy-plus-1.webp?v=1690485403"},{"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-uhc-light-pollution-filter","title":"Optolong UHC Light Pollution Filter","description":"\u003ch2\u003eOptolong UHC Light Pollution Filter\u003c\/h2\u003e\n\u003cp\u003eThe UHC (Ultra High Contrast) 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). 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 filter is suitable for enhancing the contrast and details for both visual and photograghic purpose at sub-rural area with heavy light pollution.\u003c\/p\u003e\n\u003cp\u003eMain Use and Performance\u003c\/p\u003e\n\u003cp\u003eSuitable for color CCD cameras and unmodified DSLRs.\u003c\/p\u003e\n\u003cp\u003eUHC with narrower passband provides higher contrast than CLS. Thus it is more suitable for urban environment where you suffer from severe light pollution.\u003c\/p\u003e\n\u003cp\u003eUHC has a substantial red passband and offer superb views for objects like the Orion Nebula (M42).\u003c\/p\u003e\n\u003cp\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\u003eWARNING: The filters of Optolong are not designed for sun observation.\u003cspan\u003e \u003c\/span\u003e\u003cem\u003e\u003cstrong\u003eDO NOT LOOK AT THE SUN WITH OPTOLONG FILTER\u003c\/strong\u003e\u003c\/em\u003e. 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: optical glass\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eTave\u0026gt;95%\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eBlocking range: 300-700nm\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eBlcoking depth: OD3, light pollution line blocking \u0026gt;99%\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eSurface quality: 60\/40 (Refer to MIL-O-13830A, MIL-C-48497A)\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eTransmitted Wavefront RMS:  ¼ λ\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eParallelism: 30s\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cp\u003eFilter\u003c\/p\u003e\n\u003ch3\u003eManuals \u0026amp; Warranty\u003c\/h3\u003e\n\u003cp\u003eOptolong 3-Year Warranty\u003c\/p\u003e","brand":"Optolong","offers":[{"title":"1.25\" Mounted","offer_id":43697824891109,"sku":"OL-UHC-1.25","price":77.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Mounted","offer_id":43697824923877,"sku":"OL-UHC-2","price":119.0,"currency_code":"CAD","in_stock":true},{"title":"M77 Mounted","offer_id":43697824956645,"sku":"OL-UHC-77","price":265.0,"currency_code":"CAD","in_stock":true},{"title":"Canon EOS-C Clip","offer_id":43697824989413,"sku":"OL-UHC-EOS-C","price":133.0,"currency_code":"CAD","in_stock":true},{"title":"Canon EOS FF Clip","offer_id":43697825022181,"sku":"OL-UHC-EOS-FF","price":161.0,"currency_code":"CAD","in_stock":true},{"title":"Nikon FF Clip","offer_id":43697825054949,"sku":"OL-UHC-NK-FF","price":161.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/optolong-uhc-light-pollution-filter-astronomy-plus_fbccad76-0732-4a71-aef7-04134f1b4a9c.jpg?v=1690487282"},{"product_id":"optolong-clear-sky-filter-screw-on-lens","title":"Optolong Clear Sky Filter Screw on Lens","description":"\u003ch2\u003eOptolong Clear Sky Filter Screw on Lens\u003c\/h2\u003e\n1. Optolong Clear Sky Filter Introduction\n\u003cul\u003e\n \t\u003cli\u003eA screw on filter with the easiest installation way like UV filter.\u003c\/li\u003e\n \t\u003cli\u003eSupress light pollution to make the night sky clearly.\u003c\/li\u003e\n \t\u003cli\u003eEnhance the contrast of images.\u003c\/li\u003e\n \t\u003cli\u003eTo bring up the colors, fascinating experience.\u003c\/li\u003e\n\u003c\/ul\u003e\n2. Coating Technology\n\n·Multi-layers anti-reflection coating\n\n·Non-cementing optical substrate coating\n\n·Optolong L-Pro 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.\n\n·Planetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and Optical density of off-band.","brand":"Optolong","offers":[{"title":"M77 Mounted","offer_id":43693196771557,"sku":"OL-CS-M77","price":231.0,"currency_code":"CAD","in_stock":true},{"title":"M82 Mounted","offer_id":43693196804325,"sku":"OL-CS-M82","price":287.0,"currency_code":"CAD","in_stock":true},{"title":"Nikon Z Full Frame ILDC Clip-in","offer_id":48076575473893,"sku":"OL-CS-NK-Z","price":231.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/optolong-clear-sky-filter-screw-on-lens-astronomy-plus_278f5746-b4a1-42e0-93cd-cbb2d42c993f.png?v=1690487282"},{"product_id":"optolong-sii-6-5nm-imaging-narrowband-filter","title":"Optolong SII 6.5nm Imaging Narrowband Filter","description":"\u003ch2\u003eOptolong SII 6.5nm Imaging Narrowband Filter\u003c\/h2\u003e\n\u003cp\u003eOptolongimproved narrowband SII6.5nm filter (Sulful II for CCD) is designed for nebula observation allowing 6.5nm bandwidth of light centered on a wavelength of 672nm through, and reducing the transmission of certain wavelengths of light, specifically those produced by artificial light including mercury vapor, and both highand 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\u003e\u003cstrong\u003eMain use and performance:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSuitable for viewing on faint emission nebula of H-Alpha line in full moonlight or in severe light pollution.\u003c\/p\u003e\n\u003cp\u003eHubble look of images can be made by the combination of H-alpha, OIII-CCD and SII-CCD, such as the famous “Pillars of Creation” (M16 Eagle Nebula).\u003c\/p\u003e\n\u003cp\u003eNarrowband imaging with SHO kit (H-alpha7nm, OIII 6.5nm and SII6.5nm) can be done with the moon up in heavy light pollution, so your equipment is not sitting dormant for several weeks.\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\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/optolong.com\/uploads\/images\/20210703\/3427717cb1f3057669a8ab02ddfd6cd6.png\" width=\"545\" height=\"317\"\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▲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\u003cp\u003e▲ The SII6.5nm filter line is shown in\u003cstrong\u003e\u003cspan style=\"color: #0d5bc9;\"\u003e BLUE.\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"http:\/\/optolong.com\/uploads\/images\/20191111\/0ff2d7f395c427aa390ff53daf333cec.jpg\" width=\"597\" height=\"98\"\u003e\u003c\/p\u003e\n\u003ch3\u003eIn The Box\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":43697810374885,"sku":"OL-SII-125","price":222.0,"currency_code":"CAD","in_stock":true},{"title":"2\"","offer_id":43697810440421,"sku":"OL-SII-2","price":320.0,"currency_code":"CAD","in_stock":true},{"title":"31mm","offer_id":43697810505957,"sku":"OL-SII-31","price":237.0,"currency_code":"CAD","in_stock":true},{"title":"36mm","offer_id":43697810571493,"sku":"OL-SII-36","price":264.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/optolong-sii-6-5nm-imaging-narrowband-filter-astronomy-plus_7b34aae6-cbca-42bc-af0d-24dbf0fe8090.png?v=1690487282"},{"product_id":"optolong-cls-ccdcity-light-suppression-broadband-filter","title":"Optolong CLS-CCD(City Light Suppression) Broadband Filter","description":"\u003ch2\u003eOptolong CLS CCD (City Light Suppression) Broadband Filter\u003c\/h2\u003e\n\u003cp\u003eThe CLS (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). 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 filter is suitable for enhancing the contrast and details for both visual and photographic purpose at sub-rural area.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMain Use\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSuitable for color CCD cameras and unmodified DSLRs.\u003c\/p\u003e\n\u003cp\u003eCLS with wider pass-band than UHC and hence is more favored when observing under mild to moderate light pollution.\u003c\/p\u003e\n\u003cp\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\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\u003eSbustrate: Optical glass\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: 400-700nm\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eBlcoking 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 data-mce-fragment=\"1\"\u003eIn the Box\u003cbr data-mce-fragment=\"1\"\u003e\n\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan mce-data-marked=\"1\"\u003eFilter\u003c\/span\u003e\u003c\/p\u003e","brand":"Optolong","offers":[{"title":"1.25\"","offer_id":43693204865253,"sku":"OL-CLS-CCD-1.25","price":133.0,"currency_code":"CAD","in_stock":true},{"title":"2\"","offer_id":43693204898021,"sku":"OL-CLS-CCD-2","price":223.0,"currency_code":"CAD","in_stock":true},{"title":"EOS-C","offer_id":46339850535141,"sku":"OL-CLS-CCD-EOSC","price":161.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/optolong-cls-ccd-city-light-suppression-broadband-filter-astronomy-plus_a104e94a-31bc-4ec0-99c9-86af2f3d231a.png?v=1690487285"},{"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":"optolong-improved-oiii-6-5nm-narrowband-filter","title":"Optolong Improved OIII 6.5nm Narrowband Filter","description":"\u003ch2\u003eOptolong Improved OIII 6.5nm Narrowband Filter\u003c\/h2\u003e\n\u003cp\u003eOptolong improved extra Narrowband OIII-CCD 6.5nm filter is designed for nebula observation allowing 6.5nm bandwidth of light centered on a wavelength of 500nm through, which corresponds to OIII emission lines, 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).\u003c\/p\u003e\n\u003cp\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\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMain use and performance:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSuitable for viewing on faint emission nebula of H-Alpha line in full moonlight or in severe light pollution.\u003c\/p\u003e\n\u003cp\u003eHubble look of images can be made by the combination of H-alpha, OIII-CCD and SII-CCD, such as the famous “Pillars of Creation” (M16 Eagle Nebula).\u003c\/p\u003e\n\u003cp\u003eNarrowband imaging with SHO kit (H-alpha7nm, OIII 6.5nm and SII6.5nm) can be done with the moon up in heavy light pollution, so your equipment is not sitting dormant for several weeks.\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\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1594\/4815\/files\/Optolong_O-III_CCD_6.5NM_large.jpg?v=1526319792\" alt=\"Optolong LRGB HA SII \u0026amp; OIII Telescope Filter Kit-OIII Graph\"\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▲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\u003cp\u003e▲The GREEN line shows the transmission of the OIII6.5nm filter. \u003c\/p\u003e\n\u003cp\u003e\u003cimg alt=\"\" src=\"http:\/\/optolong.com\/uploads\/images\/20191111\/0ff2d7f395c427aa390ff53daf333cec.jpg\" width=\"767\" height=\"126\"\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Optolong","offers":[{"title":"1.25\"","offer_id":43697194467557,"sku":"OL-OIII-125","price":222.0,"currency_code":"CAD","in_stock":true},{"title":"2\"","offer_id":43697194500325,"sku":"OL-OIII-2","price":320.0,"currency_code":"CAD","in_stock":true},{"title":"31mm","offer_id":43697194533093,"sku":"OL-OIII-31","price":237.0,"currency_code":"CAD","in_stock":true},{"title":"36mm","offer_id":43697194565861,"sku":"OL-OIII-36","price":264.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/optolong-improved-oiii-6-5nm-narrowband-filter-astronomy-plus_0958913b-c5db-44b9-bb0d-8886012e3b10.png?v=1690487285"},{"product_id":"optolong-h-alpha-7nm-narrowband-filter","title":"Optolong H-Alpha 7nm Narrowband Filter","description":"\u003ch2\u003eOptolong H-Alpha 7nm Narrowband Filter\u003c\/h2\u003e\n\u003cp\u003eOptolong improved version of 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\u003e\u003cstrong\u003eMain use and performance:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSuitable for viewing on faint emission nebula of H-Alpha line in full moonlight or in severe light pollution.\u003c\/p\u003e\n\u003cp\u003eHubble look of images can be made by the combination of H-alpha, OIII-CCD and SII-CCD, such as the famous “Pillars of Creation” (M16 Eagle Nebula).\u003c\/p\u003e\n\u003cp\u003eNarrowband imaging with SHO set (H-alpha, OIII-CCD and SII-CCD) can be done with the moon up in heavy light pollution, so your equipment is not sitting dormant for several weeks.\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\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\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cdiv style=\"text-align: center;\"\u003e\u003cimg src=\"https:\/\/www.optolong.com\/uploads\/images\/20210703\/3427717cb1f3057669a8ab02ddfd6cd6.png\" alt=\"\" style=\"float: none;\" width=\"669\" height=\"389\"\u003e\u003c\/div\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan style=\"color: #ff2a00;\"\u003e※This curve is only for reference, and is not used as the final product data.\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 alt=\"\" src=\"http:\/\/optolong.com\/uploads\/images\/20191111\/0ff2d7f395c427aa390ff53daf333cec.jpg\" width=\"591\" height=\"97\"\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","brand":"Optolong","offers":[{"title":"1.25\"","offer_id":43693214466277,"sku":"OL-HA-125","price":222.0,"currency_code":"CAD","in_stock":true},{"title":"2\"","offer_id":43693214499045,"sku":"OL-HA-2","price":320.0,"currency_code":"CAD","in_stock":true},{"title":"31mm unmounted","offer_id":43693214531813,"sku":"OL-HA-31","price":236.0,"currency_code":"CAD","in_stock":true},{"title":"36mm unmounted","offer_id":43693214564581,"sku":"OL-HA-36","price":264.0,"currency_code":"CAD","in_stock":true},{"title":"EOS-C","offer_id":46339847127269,"sku":null,"price":307.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/optolong-h-alpha-7nm-narrowband-filter-astronomy-plus_749d0928-f62b-49e9-8873-ff8ec9959bd2.png?v=1690487285"},{"product_id":"optolong-improved-nb-filters-sho-6-5nm-narrowband-filter-kit","title":"Optolong Improved NB Filters SHO 6.5nm Narrowband Filter Kit","description":"\u003ch2\u003eOptolong NB Filters SHO 6.5nm Narrowband Filter Kit\u003c\/h2\u003e\n\u003cp\u003eOptolong SHO6.5nm filter kit includes SII6.5nm, H-Alpha7nm, and OIII6.5nm narrow-band filters, generally working with astronomical monochrome cooling CCD and modified DSLR  imaging in each single-channel . Corresponding with RGB channel (Ha, OIII, SII), photographers can process Hubble images by astronomical post processing software .\u003c\/p\u003e\n\u003cp\u003eExtra narrowband SIICCD 6.5nm filter (Sulful II for CCD) is designed for nebula observation allowing 12nm bandwidth of light centered on a wavelength of 672nm 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)\u003c\/p\u003e\n\u003cp\u003eH-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\u003eExtra Narrowband OIII-CCD 6.5nm filter is designed for nebula observation allowing 6.5nm bandwidth of light centered on a wavelength of 500nm through, which corresponds to OIII emission lines, 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).\u003c\/p\u003e\n\u003cp\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\/p\u003e\n\u003ch4\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cp\u003eGive you higher contrast and greater detailed viewing;\u003c\/p\u003e\n\u003cp\u003eDecrease background noise and improve the contrast of objects;\u003c\/p\u003e\n\u003cp\u003eIncrease the faint nebula signal and make it to be brightness;\u003c\/p\u003e\n\u003cp\u003eWith narrow band filters kit, you are able to process a hubble image;\u003c\/p\u003e\n\u003cp\u003eThrough the optimization of the substrate and upgrading of coating technology, significantly improved the halo around the stars, especially in O3.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/optolong.com\/uploads\/images\/20191119\/37274b18916a7e7d6fc4f9a0a201f11b.jpg\" width=\"485\" height=\"282\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"http:\/\/optolong.com\/uploads\/images\/20191111\/0ff2d7f395c427aa390ff53daf333cec.jpg\" width=\"609\" height=\"100\"\u003e\u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eIn the Box\u003cbr data-mce-fragment=\"1\"\u003e\n\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan\u003eOIII \/ H-A \/ SII Filters\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003e\u003cbr\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Optolong","offers":[{"title":"1.25\"","offer_id":43697078304997,"sku":"OL-SHO-1.25","price":665.0,"currency_code":"CAD","in_stock":true},{"title":"2\"","offer_id":43697078337765,"sku":"OL-SHO-2","price":937.0,"currency_code":"CAD","in_stock":true},{"title":"31mm","offer_id":43697078370533,"sku":"OL-SHO-31","price":685.0,"currency_code":"CAD","in_stock":true},{"title":"36mm","offer_id":43697078403301,"sku":"OL-SHO-36","price":768.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/optolong-improved-nb-filters-sho-6-5nm-narrowband-filter-kit-astronomy-plus_ec64c790-0e6e-43af-b2ba-0ce0fdbd3a41.png?v=1690487285"},{"product_id":"optolong-uv-ir-cut","title":"Optolong UV\/IR CUT filter","description":"\u003ch2\u003eOptolong UV\/IR CUT\u003c\/h2\u003e\n\u003cp data-mce-fragment=\"1\"\u003eOptolong UV\/IR Cut filter is designed for ultraviolet and infrared wavelength blocking to improve sharpness of the image as most of the optics are designed for the visible spectrum, because it’s very difficult to create a lens with the same focal point for the visible and IR spectrum.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eIt is used on a digital camera and the video, which do not have an IR protection filter toward an image sensor or were remodeled. This is important because unfiltered CCD and CMOS sensors are extremely susceptible to UV and IR rays just outside the visible spectrum that can have a very negative impact on image quality.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eMain Use and Performance\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eSuitable for color CMOS and CCD cameras and modified DSLRs.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eUse with monochrome CCD for astrophotography.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eAvailable to assist in focusing.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eAct as an outstanding dust shield, which prevents the possibility of dust settling on the lens during long time exposure.\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\u003ch3 data-mce-fragment=\"1\"\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/optolong.com\/uploads\/images\/20210621\/ae00cf1d3abbdeca0160763948615996.png\" width=\"540\" height=\"349\"\u003e\u003c\/p\u003e\n\u003cp\u003eHow to read the chart?\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\u003cp\u003e▲The RED line shows the transmission of the UV\/IR Cut filter.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"http:\/\/optolong.com\/uploads\/images\/20191111\/0ff2d7f395c427aa390ff53daf333cec.jpg\" alt=\"\" width=\"609\" height=\"100\"\u003e\u003c\/p\u003e\n\u003ch3\u003eIn The Box\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":43697833312485,"sku":"OL-UVIR-1.25","price":61.0,"currency_code":"CAD","in_stock":true},{"title":"2\"","offer_id":43697833345253,"sku":"OL-UVIR-2","price":90.0,"currency_code":"CAD","in_stock":true},{"title":"31mm","offer_id":43697833378021,"sku":"OL-UVIR-31","price":63.0,"currency_code":"CAD","in_stock":true},{"title":"36mm","offer_id":43697833410789,"sku":"OL-UVIR-36","price":77.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/optolong-uvir-cut-astronomy-plus_cd36ff27-e51a-4277-a88a-b6d5f6831f99.png?v=1690487288"},{"product_id":"optolong-night-sky-h-alpha-filter","title":"Optolong Night Sky H-Alpha filter (IR-Pass 650nm)","description":"\u003ch2\u003eOptolong Night Sky H-Alpha filter\u003c\/h2\u003e\n\u003cp\u003eNight Sky H-Alpha filter (IR Pass 650nm) with 50% transition from blocking to passing at about 640nm and 95% or above transmission at wavelengths longer than 650nm can be used in IR-LRGB imaging to produce a sharper luminance image for the best planetary contrast as atmospheric seeing and distortion is much reduced at longer IR wavelengths.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMain Use\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe sensor of CCD or CMOS cameras is capable of detecting light in the 350-1100nm range including infrared wavelengths. Thus RGB planetary images taken with IR as the luminance channel have visible-enhanced contrast and surface detail than standard LRGB images.\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\u003eSubstrate: Optical glass\u003cbr\u003eThickness: 1.85mm\u003cbr\u003eTave:  T\u0026gt;90%\u003cbr\u003eBlocking range: 300-570nm\u003cbr\u003eSurface quality: 60\/40\u003cbr\u003eTransmitted Wavefront RMS: λ\/4\u003cbr\u003eParallelism: 30s\u003c\/p\u003e\n\u003cp\u003e\u003cimg data-ll-status=\"loaded\" class=\"lazyloaded\" alt=\"\" src=\"https:\/\/optolong.com\/uploads\/images\/20201125\/afe8c3f4e4eb968ef68dd5839b667b29.png\" width=\"532\" height=\"347\"\u003e\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 %.\u003c\/p\u003e\n\u003cp\u003e▲The RED line shows the transmission of the Night Sky H-Alpha filter.\u003c\/p\u003e\n\u003ch3\u003eIn The Box\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":43697758830821,"sku":"OL-NSHA-1","price":111.0,"currency_code":"CAD","in_stock":true},{"title":"2\"","offer_id":43697758863589,"sku":"OL-NSHA-2","price":167.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/optolong-night-sky-h-alpha-filter-ir-pass-650nm-astronomy-plus_9a5d747f-d16c-4d12-8485-0e83f2bbc979.png?v=1690487288"},{"product_id":"optolong-narrowband-h-beta-filter","title":"Optolong Narrowband H-Beta filter","description":"\u003ch2\u003eOptolong Narrowband H-Beta filter\u003c\/h2\u003e\n\u003cp\u003eOpotlong narrowband H-beta filter is designed for nebula observation allowing 12nm bandwidth of light centered on a wavelength of 486nm 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). H-beta emits 486nm and it is a blue-colored filte.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMain Use\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eUse with a large aperture telescope under clear and dark viewing conditions with good seeing.\u003c\/p\u003e\n\u003cp\u003eSuitable for viewing on the faint and elusive Horsehead Nebula and California Nebula.\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\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\u003eSubstrate: Optical glass\u003cbr\u003eThickness: 1.85mm\u003cbr\u003eTave:  T\u0026gt;80%\u003cbr\u003eBlocking range: 400-700nm\u003cbr\u003eBlocking depth: light pollution  line blocking \u0026gt;99%\u003cbr\u003eSurface quality: 60\/40\u003cbr\u003eTransmitted Wavefront RMS: λ\/4\u003cbr\u003eParallelism: 30s\u003c\/p\u003e\n\u003cp\u003e\u003cimg height=\"381\" width=\"595\" src=\"https:\/\/optolong.com\/uploads\/images\/20201125\/c6985afa5412b452d95c07c7672b85ef.png\" alt=\"\" class=\"lazyloaded\" data-ll-status=\"loaded\"\u003e\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 %.\u003c\/p\u003e\n\u003cp\u003e▲The WHITE line shows the transmission of the H-Beta filter. Green line shows the emmission of nebula. The artifical emission lines are shown in ORANGE.\u003c\/p\u003e\n\u003cp\u003e\u003cimg height=\"93\" width=\"567\" src=\"http:\/\/www.optolong.com\/uploads\/images\/20191111\/0ff2d7f395c427aa390ff53daf333cec.jpg\" alt=\"\" class=\"lazyloaded\" data-ll-status=\"loaded\"\u003e\u003c\/p\u003e\n\u003ch3\u003eIn The Box\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":43697732092133,"sku":"OL-HBETA-1.25","price":124.0,"currency_code":"CAD","in_stock":true},{"title":"2\"","offer_id":43697732124901,"sku":"OL-HBETA-2","price":194.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/optolong-narrowband-h-beta-filter-astronomy-plus_51584a29-5e66-4909-a30c-d5b86d715abd.png?v=1690487288"},{"product_id":"optolong-nd3-0-neutral-density-filter","title":"Optolong ND3.0 Neutral Density Filter","description":"\u003ch2\u003eOptolong ND3.0 Neutral Density Filter\u003c\/h2\u003e\n\u003cp\u003eNeutral Density (ND) filters are designed to reduce transmission evenly across a portion of a specific spectrum. ND filters are typically defined by their Optical Density (OD) which describes the amount of energy blocked by the filter. A high optical density value indicates very low transmission, and low optical density indicates high transmission (Equations 1-2). ND filters can be stacked to achieve a customs optical density. To calculate the final system OD, simply add the OD of each filter together.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTypes of Neutral Density Filters\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThere are two types of ND filters: reflective and absorptive.\u003c\/p\u003e\n\u003cp\u003eReflective ND filters consist of thin film optical coating, typically metallic, that have been applied to a galls substrate. The coating can be optimized for specific wavelength ranges such as UV-VIS or NIR. Thin film coating primarily reflects light back toward the source. Special care should be taken to ensure the reflected light does not interfere with the system setup.\u003c\/p\u003e\n\u003cp\u003eAbsorptive ND filters utilize a glass substrate to absorb light by a specific percentage.\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: optical galss\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eThickness: 1.85mm\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eT=0.1%\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\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":43697745527013,"sku":"OL-ND-125","price":69.0,"currency_code":"CAD","in_stock":true},{"title":"2\"","offer_id":43697745559781,"sku":"OL-ND-2","price":111.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/optolong-nd3-0-neutral-density-filter-astronomy-plus_66251974-b4e5-4c35-aa0d-11b686f20882.png?v=1690487288"},{"product_id":"optolong-clear-focusing-filter","title":"Optolong Clear Focusing Filter","description":"\u003ch2\u003eOptolong Clear Focusing Filter\u003c\/h2\u003e\n\u003cp\u003eOptolong Clear focusing filter is designed to highly pass the visible spectral region 420-680nm at 98.5% transmission.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMain Use\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eUse of astrophotography filters, especially narrowband filters, often results in dim images which can be difficult to focus. Clear focusing filter can be used first to clearly focus the image.\u003c\/p\u003e\n\u003cp\u003eUse with modified DSLRs for higher efficiency and sensitivity by passing visible range with 98.5% transmission.\u003c\/p\u003e\n\u003cp\u003eAct as an outstanding dust shield, which prevents the possibility of dust settling on the lens during long time exposure.\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\u003eSbustrate: B270\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eThickness: 1.85mm\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eTave:  T\u0026gt;98.5%\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\u003e\u003cspan\u003e\u003cimg src=\"https:\/\/optolong.com\/uploads\/images\/20201125\/17144ed49cbdafca3c8e855b1129a71a.png\" width=\"499\" height=\"326\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eHow to read the chart?\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\u003ch3 data-mce-fragment=\"1\"\u003eIn the Box\u003cbr data-mce-fragment=\"1\"\u003e\n\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan\u003eFilter\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eManual \u0026amp; Warranty\u003c\/h3\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Optolong","offers":[{"title":"1.25\"","offer_id":43693144277221,"sku":"OPT-CF-1.25","price":33.0,"currency_code":"CAD","in_stock":true},{"title":"2\"","offer_id":43693144309989,"sku":"OPT-CF-2","price":41.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/optolong-clear-focusing-filter-astronomy-plus_123750df-9a37-44c8-92bc-1e7d6597d016.png?v=1690487288"},{"product_id":"optolong-ir-pass685-planetary-filter","title":"Optolong IR Pass685 Planetary Filter","description":"\u003ch2\u003eOptolong IR Pass685 Planetary Filter\u003c\/h2\u003e\n\u003cp\u003eOptolong IR Pass 685nm filter is designed to block wavelengths below 670nm and can be used in IR-LRGB imaging to produce a sharper luminance image for the best planetary contrast as atmospheric seeing and distortion is much reduced at longer IR wavelengths.\u003c\/p\u003e\n\u003cp\u003eThe sensor of CCD or CMOS cameras is capable of detecting light in the 350-1100nm range including infrared wavelengths. Thus RGB planetary images taken with IR as the luminance channel have visible-enhanced contrast and surface detail than standard LRGB images.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003eAdditionnal Features:\u003c\/strong\u003e\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003eIR Pass 685nm filter is designed to block wavelengths below 670nm and can be used in IR-LRGB imaging to produce a sharper luminance image for the best planetary contrast as atmospheric seeing and distortion is much reduced at longer IR wavelengths.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications:\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eSbustrate:\u003c\/strong\u003e B270\u003cbr\u003e\u003cstrong\u003eThickness:\u003c\/strong\u003e 1.85mm\u003cbr\u003e\u003cstrong\u003eTave:\u003c\/strong\u003e  T\u0026gt;90%\u003cbr\u003e\u003cstrong\u003eBlocking range:\u003c\/strong\u003e 350-1050nm\u003cbr\u003e\u003cstrong\u003eBlcoking depth:\u003c\/strong\u003e light pollution  line blocking \u0026gt;99%\u003cbr\u003e\u003cstrong\u003eSurface quality:\u003c\/strong\u003e 60\/40\u003cbr\u003e\u003cstrong\u003eTransmitted Wavefront RMS:\u003c\/strong\u003e λ\/4\u003cbr\u003e\u003cstrong\u003eParallelism:\u003c\/strong\u003e 30s\u003c\/p\u003e\n\u003cp\u003e\u003cimg data-ll-status=\"loaded\" class=\"lazyloaded\" alt=\"\" src=\"https:\/\/optolong.com\/uploads\/images\/20200728\/f38d04404d461d5c64dd2159dc025330.png\" width=\"450\" height=\"247\"\u003e\u003c\/p\u003e\n\u003cp\u003eHow to read the chart?\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","brand":"Optolong","offers":[{"title":"1.25\"","offer_id":43697238180069,"sku":"OL-IR685-1.25","price":110.0,"currency_code":"CAD","in_stock":true},{"title":"2\"","offer_id":43697238212837,"sku":"OL-IR685-2","price":160.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/optolong-ir-pass685-planetary-filter-astronomy-plus_cc837c01-acfa-4006-bfa3-c5fd37e31402.png?v=1690487293"},{"product_id":"optolong-sho-3nm-narrowband-filters-kit","title":"Optolong SHO 3nm Narrowband Filters Kit","description":"\u003ch2\u003eOptolong SHO 3nm Narrowband Filters Kit\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eOptolong SHO-3nm Narrowband Filters Introduction\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eOptolong SHO-3nm filter kit includes SII 3nm, H-Alpha 3nm, and OIII 3nm narrow band filters, generally working with astronomical monochrome cooling CCD and modified DSLR imaging in each single-channel. Corresponding with RGB channel (HA, OIII, SII), photographers can process Hubble images by astronomical post processing software.\u003c\/p\u003e\n\u003cp\u003eExtra narrowband SIICCD3nm filter  (Sulful II for CCD) is designed for nebula observation allowing 3nm bandwidth of light  centered on a wavelength of 672nm 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)\u003c\/p\u003e\n\u003cp\u003eH-Alpha 3nm filter is the popular narrowband filter allowing 3nm 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 vapor lights and unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e.skyglow). Better choice of narrowband H-Alpha astrophotographer filter for highest contrast and revealing subtle nebula details.\u003c\/p\u003e\n\u003cp\u003eExtra narrowband OIII-CCD 3nm filter is designed for nebula observation allowing 3nm bandwidth of light centered on a wavelength of 500nm through, which corresponds to OIII emission line, 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).\u003c\/p\u003e\n\u003cp\u003eOIII emits 495.9nm and 500.7nm and it is a blue-green colored filter. Many of images of planetary nebula and supernoval remnants are taken only with H-Alpha and OIIII filters. They show great structural details, but have natural colors, looking like an RGB image.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003eGive you higher contrast and greater detailed viewing;\u003c\/p\u003e\n\u003cp\u003eDecrease background noise and improve the contrast of objects;\u003c\/p\u003e\n\u003cp\u003eIncrease the faint nebula signal and make i tto be brightness;\u003c\/p\u003e\n\u003cp\u003eWith narrow band fitlers kit, you are able to process a hubble image;\u003c\/p\u003e\n\u003cp\u003eThrough the optimization of the sustrate and upgrading of coating technology.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eReference Spectrum\u003c\/strong\u003e  \u003c\/p\u003e\n\u003cp\u003e\u003cimg alt=\"\" src=\"https:\/\/www.optolong.com\/uploads\/images\/20211201\/56095a94c3cebfd0ebdc80f423d27c58.png\" width=\"528\" height=\"244\"\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 %.\u003c\/p\u003e\n\u003cp\u003e▲The BLUE line shows the transmission of OIII3nm.The H-Alpha 3nm line is showen in GREEN. And the SII 3nm filter line is shown in RED.\u003c\/p\u003e\n\u003cp\u003e \u003cimg alt=\"\" src=\"http:\/\/optolong.com\/uploads\/images\/20191111\/0ff2d7f395c427aa390ff53daf333cec.jpg\" width=\"670\" height=\"110\"\u003e \u003cstrong\u003eCoating Technology\u003c\/strong\u003e ·Multi-layers anti-reflection coating ·Non-cementing optical substrate coating ·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. ·Planetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and Optical density of off-band.    \u003cimg alt=\"\" src=\"http:\/\/optolong.com\/uploads\/images\/20191111\/497e351dc95fe824244ce6bf6135cbd0.png\" width=\"484\" height=\"211\"\u003e    \u003c\/p\u003e\n\u003ch3\u003ePerformances\u003c\/h3\u003e\n\u003ch2\u003e\u003cstrong\u003eOptolong SHO-3nm Narrowband Filters Performance\u003c\/strong\u003e\u003c\/h2\u003e\n \n\u003cp data-mce-fragment=\"1\"\u003eAs we all know, OIII narrow band filter has always been a problem in the aspect of halo. Thanks to the experience of 7nm narrow band filter, the halo of OIII 3nm filter was optimized by optimizing the coating technology. This time, we also conducted a qualitative halo test in the bright star of veil Nebula, and it can be seen from the original picture that OIII 3nm performs better in the bright star.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eTelescope：RASA 11寸 f2\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eCamera：QHY 600\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eMount:艾顿 IOptron CEM120\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eOptolong OIII-3nm single 10min\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eCopyright: Wuzhen\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cimg data-mce-fragment=\"1\" data-ll-status=\"loaded\" class=\"lazyloaded\" alt=\"\" src=\"https:\/\/www.optolong.com\/uploads\/images\/20211201\/4397cdca0bb736431cb0f3d9f267cd2b.png\" data-mce-src=\"https:\/\/www.optolong.com\/uploads\/images\/20211201\/4397cdca0bb736431cb0f3d9f267cd2b.png\" width=\"506\" height=\"317\"\u003e\u003c\/p\u003e\n\u003ch2 data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eExemples with SHO 3nm filters\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eI. \u003cu data-mce-fragment=\"1\"\u003eThe Bubble Nebula (NGC 7635)  © \u003ca data-mce-fragment=\"1\" href=\"https:\/\/astrodoc.ca\/hubble-bubble\/?fbclid=IwAR1BN9oaT7frsUM5dOT7Nm7ZZIxhrM-huHrAqD4Psm4eY3BJLncXTwZyy98\" data-mce-href=\"https:\/\/astrodoc.ca\/hubble-bubble\/?fbclid=IwAR1BN9oaT7frsUM5dOT7Nm7ZZIxhrM-huHrAqD4Psm4eY3BJLncXTwZyy98\"\u003eAstrodoc Ron Brecher \u003c\/a\u003e \u003c\/u\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eAcquisition, focusing, and control of Paramount MX mount with N.I.N.A., TheSkyX and PHD2. Focus with Optec DirectSync motor and controller. Equipment control with PrimaLuce Labs Eagle 4 Pro computer. All pre-processing and processing in PixInsight. Acquired from Ron‘s \u003ca data-mce-fragment=\"1\" href=\"https:\/\/skyshed.com\/\" data-mce-href=\"https:\/\/skyshed.com\/\"\u003eSkyShed\u003c\/a\u003e in Guelph. Average transparency and seeing. Data acquired Oct 18-19, 2021 under a brightly moonlit sky (Moon 12 days old)..\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eSky-Watcher Esprit 150 f\/7 refractor and QHY600M camera with Optolong H-alpha, O(III) and S(II) 3nm filters – FIRST LIGHT WITH 3nm BANDPASS FILTERS\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eHa: 9 x 20m = 3hr00m\u003cbr data-mce-fragment=\"1\"\u003eO3: 10 x 20m = 3hr20m\u003cbr data-mce-fragment=\"1\"\u003eS2: 9 x 20m = 3hr00m\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eTotal: 9hr20m\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eImage scale 0.72 arcsec per pixel\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003ca data-mce-fragment=\"1\" href=\"https:\/\/astrodoc.ca\/hubble-bubble\/?fbclid=IwAR1BN9oaT7frsUM5dOT7Nm7ZZIxhrM-huHrAqD4Psm4eY3BJLncXTwZyy98\" data-mce-href=\"https:\/\/astrodoc.ca\/hubble-bubble\/?fbclid=IwAR1BN9oaT7frsUM5dOT7Nm7ZZIxhrM-huHrAqD4Psm4eY3BJLncXTwZyy98\"\u003e\u003cimg data-mce-fragment=\"1\" data-ll-status=\"loaded\" alt=\"\" src=\"https:\/\/www.optolong.com\/uploads\/images\/20211201\/14a06805527ed873c87d3906b9ff5480.jpg\" class=\"lazyloaded\" data-mce-src=\"https:\/\/www.optolong.com\/uploads\/images\/20211201\/14a06805527ed873c87d3906b9ff5480.jpg\" width=\"479\" height=\"333\"\u003e\u003c\/a\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\"\u003eⅡ.\u003cu data-mce-fragment=\"1\"\u003e Pacman Nebula NGC 281 in the Hubble Palette  © \u003ca data-mce-fragment=\"1\" href=\"https:\/\/astrodoc.ca\/hubble-bubble\/?fbclid=IwAR1BN9oaT7frsUM5dOT7Nm7ZZIxhrM-huHrAqD4Psm4eY3BJLncXTwZyy98\" data-mce-href=\"https:\/\/astrodoc.ca\/hubble-bubble\/?fbclid=IwAR1BN9oaT7frsUM5dOT7Nm7ZZIxhrM-huHrAqD4Psm4eY3BJLncXTwZyy98\"\u003eLuca Fornaciari Astrophotography  \u003c\/a\u003e \u003c\/u\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003ePacman Nebula NGC 281 in the Hubble Palette\u003cbr data-mce-fragment=\"1\"\u003eWith the bad weather persisting I have taken these last few weeks to experiment with new way in the development of narrowband shots.\u003cbr data-mce-fragment=\"1\"\u003eI’m happy because I’m defining a Hubble Palette that really feels mine, designing it a little at a time.\u003cbr data-mce-fragment=\"1\"\u003eNarrowband is creative and fun because it allows us a good deal of freedom to experiment with the integration of the individual channels and the image you see is a developing version of what I am building.\u003cbr data-mce-fragment=\"1\"\u003eThe image was obtained with the new 3nm Optolong filters. If the bad weather will allow me a few nights I will soon finish my tests on these filters, but for now the impressions are really good.\u003cbr data-mce-fragment=\"1\"\u003e240 minutes of Ha, 510 of OIII and 260 minutes of SII with the ASI 294MM and the Sky-Watcher 300 f\/4.\u003cbr data-mce-fragment=\"1\"\u003eI wish you a beautiful sunny day!\u003cbr data-mce-fragment=\"1\"\u003eSETUP:\u003cbr data-mce-fragment=\"1\"\u003eSky-Watcher 300 f \/ 4 on EQ8R-Pro\u003cbr data-mce-fragment=\"1\"\u003eZWO ASI 294MM, \u003cstrong data-mce-fragment=\"1\"\u003eOptolong Filters Ha 3nm, OIII 3nm, SII 3nm\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003ca data-mce-fragment=\"1\" href=\"https:\/\/www.facebook.com\/photo?fbid=317253446884697\u0026amp;set=a.294756879134354\" data-mce-href=\"https:\/\/www.facebook.com\/photo?fbid=317253446884697\u0026amp;set=a.294756879134354\"\u003e\u003cimg data-mce-fragment=\"1\" data-ll-status=\"loaded\" alt=\"\" src=\"https:\/\/www.optolong.com\/uploads\/images\/20211201\/991d6920cac738a1ac8277a582bac7dd.jpg\" class=\"lazyloaded\" data-mce-src=\"https:\/\/www.optolong.com\/uploads\/images\/20211201\/991d6920cac738a1ac8277a582bac7dd.jpg\" width=\"529\" height=\"352\"\u003e\u003c\/a\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\"\u003eIII.\u003cu data-mce-fragment=\"1\"\u003e NGC7000  © \u003ca data-mce-fragment=\"1\" href=\"https:\/\/www.facebook.com\/photo\/?fbid=10221694325160924\u0026amp;set=a.1349013078910\" data-mce-href=\"https:\/\/www.facebook.com\/photo\/?fbid=10221694325160924\u0026amp;set=a.1349013078910\"\u003eTommaso Massimo Stella  \u003c\/a\u003e \u003c\/u\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eFinalmente, dopo mesi, sono riuscito a testare parte dei nuovi filtri Optolong Astronomy Filter\u003cstrong data-mce-fragment=\"1\"\u003e ha 3nm\u003c\/strong\u003e ancora non sul mercato (sono un beta tester).\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003ca data-mce-fragment=\"1\" href=\"https:\/\/www.facebook.com\/photo\/?fbid=10221694325160924\u0026amp;set=a.1349013078910\" data-mce-href=\"https:\/\/www.facebook.com\/photo\/?fbid=10221694325160924\u0026amp;set=a.1349013078910\"\u003e\u003cimg data-mce-fragment=\"1\" data-ll-status=\"loaded\" alt=\"\" src=\"https:\/\/www.optolong.com\/uploads\/images\/20211201\/cd8b15936c6847961837359233668f42.jpg\" class=\"lazyloaded\" data-mce-src=\"https:\/\/www.optolong.com\/uploads\/images\/20211201\/cd8b15936c6847961837359233668f42.jpg\" width=\"522\" height=\"372\"\u003e\u003c\/a\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\"\u003eⅣ.\u003cu data-mce-fragment=\"1\"\u003e Nebulose Nord America  © \u003ca data-mce-fragment=\"1\" href=\"https:\/\/www.facebook.com\/photo\/?fbid=10221694325160924\u0026amp;set=a.1349013078910\" data-mce-href=\"https:\/\/www.facebook.com\/photo\/?fbid=10221694325160924\u0026amp;set=a.1349013078910\"\u003eTommaso Massimo Stella  \u003c\/a\u003e \u003c\/u\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eTest dei nuovi filtri Optolong Astronomy Filter H alpha e OIII a 3nm (non ancora sul mercato) sotto cieli inquinati (Bortle 8\/9), con camera a colori e diametro limitato.\u003cbr data-mce-fragment=\"1\"\u003eElaborazione basica, senza considerare il colore delle stelle.\u003cbr data-mce-fragment=\"1\"\u003ePurtroppo il meteo mi ha concesso circa 3 ore per canale, manca ancora l’SII per comporre l’Hubble palette, spero di poter terminare la prossima settimana.\u003cbr data-mce-fragment=\"1\"\u003eLights: \u003cstrong data-mce-fragment=\"1\"\u003e12x900s (Ha 3nm) + 20x600s (OIII 3nm)\u003c\/strong\u003e\u003cbr data-mce-fragment=\"1\"\u003eTelescope: Takahashi FS-60CB + Reducer 0,72x\u003cbr data-mce-fragment=\"1\"\u003eCamera: QHY 168C\u003cbr data-mce-fragment=\"1\"\u003eMount: Skywatcher AZ-EQ6 GT\u003cbr data-mce-fragment=\"1\"\u003eProcessing: DeepSkyStacker, PixInsight, Photoshop CC\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003ca data-mce-fragment=\"1\" href=\"https:\/\/www.facebook.com\/photo\/?fbid=10221731702215327\u0026amp;set=a.1349013078910\" data-mce-href=\"https:\/\/www.facebook.com\/photo\/?fbid=10221731702215327\u0026amp;set=a.1349013078910\"\u003e\u003cimg data-mce-fragment=\"1\" data-ll-status=\"loaded\" alt=\"\" src=\"https:\/\/www.optolong.com\/uploads\/images\/20211201\/287447fea211bf2ccedc07827566b595.jpg\" class=\"lazyloaded\" data-mce-src=\"https:\/\/www.optolong.com\/uploads\/images\/20211201\/287447fea211bf2ccedc07827566b595.jpg\" width=\"534\" height=\"350\"\u003e\u003c\/a\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\"\u003eV.\u003cu data-mce-fragment=\"1\"\u003e North America \u0026amp; Pelican Nubulae (Hubble Palette)  © \u003ca data-mce-fragment=\"1\" href=\"https:\/\/www.facebook.com\/photo\/?fbid=10221694325160924\u0026amp;set=a.1349013078910\" data-mce-href=\"https:\/\/www.facebook.com\/photo\/?fbid=10221694325160924\u0026amp;set=a.1349013078910\"\u003eTommaso Massimo Stella  \u003c\/a\u003e \u003c\/u\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eShooting took place on 1,4,27 and 28 October 2021 in Taranto (Italy) at about 20m above sea level.\u003cbr data-mce-fragment=\"1\"\u003eLights: 16x900s Ha + 21x600s OIII + 9x900s OIII + 16x900s SII\u003cbr data-mce-fragment=\"1\"\u003eSky: Bortle 9\u003cbr data-mce-fragment=\"1\"\u003eTotal exposure: 13,75 h\u003cbr data-mce-fragment=\"1\"\u003eTelescope: Takahashi FS-60CB + Reducer 0,72x\u003cbr data-mce-fragment=\"1\"\u003eCamera: QHY 168C\u003cbr data-mce-fragment=\"1\"\u003eFilters: Optolong Astronomy Filter \u003cstrong data-mce-fragment=\"1\"\u003eHa, OIII, SII 3nm\u003c\/strong\u003e\u003cbr data-mce-fragment=\"1\"\u003eMount: Skywatcher AZ-EQ6 GT\u003cbr data-mce-fragment=\"1\"\u003eProcessing: DeepSkyStacker, PixInsight, Photoshop CC\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003ca data-mce-fragment=\"1\" href=\"https:\/\/www.facebook.com\/photo\/?fbid=10221855955121572\u0026amp;set=a.1349013078910\" data-mce-href=\"https:\/\/www.facebook.com\/photo\/?fbid=10221855955121572\u0026amp;set=a.1349013078910\"\u003e\u003cimg data-mce-fragment=\"1\" data-ll-status=\"loaded\" alt=\"\" src=\"https:\/\/www.optolong.com\/uploads\/images\/20211201\/128c7ecb6dab1b8929703eb3a4c2112b.jpg\" class=\"lazyloaded\" data-mce-src=\"https:\/\/www.optolong.com\/uploads\/images\/20211201\/128c7ecb6dab1b8929703eb3a4c2112b.jpg\" width=\"531\" height=\"375\"\u003e\u003c\/a\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\"\u003eⅥ.\u003cu data-mce-fragment=\"1\"\u003e The Lobster Claw Nebula  © Astrodoc Ron Brecher\u003ca data-mce-fragment=\"1\" href=\"https:\/\/www.facebook.com\/photo\/?fbid=10221694325160924\u0026amp;set=a.1349013078910\" data-mce-href=\"https:\/\/www.facebook.com\/photo\/?fbid=10221694325160924\u0026amp;set=a.1349013078910\"\u003e  \u003c\/a\u003e \u003c\/u\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eAcquisition, focusing, and control of Paramount MX mount with N.I.N.A., TheSkyX and PHD2. Focus with Optec DirectSync motor and controller. Equipment control with PrimaLuce Labs Eagle 4 Pro computer. All pre-processing and processing in PixInsight. Acquired from my \u003ca data-mce-fragment=\"1\" href=\"https:\/\/skyshed.com\/\" data-mce-href=\"https:\/\/skyshed.com\/\"\u003eSkyShed\u003c\/a\u003e in Guelph. Average transparency and seeing. Acquired October 28-November 8, 2021 under a partly moonlit sky.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eSky-Watcher Esprit 150 f\/7 refractor and QHY600M camera with \u003cstrong data-mce-fragment=\"1\"\u003eOptolong H-alpha, O(III) and S(II) 3nm filters\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eChrominance: Takahashi FSQ-106 ED IV @ f\/5 and QHY367C Pro one-shot colour camera with Optolong UV\/IR filter.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eHa: 22 x 20m = 7hr20m\u003cbr data-mce-fragment=\"1\"\u003eO3: 22 x 20m = 7hr20m\u003cbr data-mce-fragment=\"1\"\u003eS2: 22 x 20m = 7hr20m189 x 5m\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eOSC = 15hr45m\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eTotal: 22hr for narrowband image; 37hr45m for broadband\/narrowband blend\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eImage scale 0.72 arcsec per pixel\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eProcessing workflow is for the Hubble Palette image.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eThe broadband image was processed similar to \u003ca data-mce-fragment=\"1\" href=\"https:\/\/astrodoc.ca\/ic-5068\/\" data-mce-href=\"https:\/\/astrodoc.ca\/ic-5068\/\"\u003eIC 5068\u003c\/a\u003e, with the luminance of the narrowband image used instead of Ha alone.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eData Reduction and Cleanup\u003cbr data-mce-fragment=\"1\"\u003eThe WeightedBatchPreProcessing script was used to perform calibration, cosmetic correction, weighting, registration and integration of all frames.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003ca data-mce-fragment=\"1\" href=\"https:\/\/astrodoc.ca\/lobster-claw\/?fbclid=IwAR2RGCHZvQBaqsNOhFm83nRrC5pVHXXq9iVBC_Qy0NIj7BYAaGp9AgSKn5I\" data-mce-href=\"https:\/\/astrodoc.ca\/lobster-claw\/?fbclid=IwAR2RGCHZvQBaqsNOhFm83nRrC5pVHXXq9iVBC_Qy0NIj7BYAaGp9AgSKn5I\"\u003e\u003cimg data-mce-fragment=\"1\" data-ll-status=\"loaded\" alt=\"\" src=\"https:\/\/www.optolong.com\/uploads\/images\/20211201\/f91f0bc04fb22c68f6c0ac11fa7b00ab.jpg\" class=\"lazyloaded\" data-mce-src=\"https:\/\/www.optolong.com\/uploads\/images\/20211201\/f91f0bc04fb22c68f6c0ac11fa7b00ab.jpg\" width=\"497\" height=\"371\"\u003e\u003c\/a\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\"\u003eⅦ.\u003cu data-mce-fragment=\"1\"\u003e NGC6960 © \u003ca data-mce-fragment=\"1\" href=\"https:\/\/www.facebook.com\/photo\/?fbid=2981303708797488\u0026amp;set=a.1385013411759867\" data-mce-href=\"https:\/\/www.facebook.com\/photo\/?fbid=2981303708797488\u0026amp;set=a.1385013411759867\"\u003eAndrea Andreotto Maggi Astrophoto\u003c\/a\u003e\u003ca data-mce-fragment=\"1\" href=\"https:\/\/www.facebook.com\/photo\/?fbid=10221694325160924\u0026amp;set=a.1349013078910\" data-mce-href=\"https:\/\/www.facebook.com\/photo\/?fbid=10221694325160924\u0026amp;set=a.1349013078910\"\u003e  \u003c\/a\u003e \u003c\/u\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eTelescopio Artec 200\u003cbr data-mce-fragment=\"1\"\u003eCamera Zwo Asi 294 MM\u003cbr data-mce-fragment=\"1\"\u003eFiltri Optolong Astronomy Filter \u003cstrong data-mce-fragment=\"1\"\u003eRGB HA 3nm OIII 3nm\u003c\/strong\u003e\u003cbr data-mce-fragment=\"1\"\u003e60 Light RED 300 sec\u003cbr data-mce-fragment=\"1\"\u003e60 Light GREEN 300 sec\u003cbr data-mce-fragment=\"1\"\u003e60 Light BLUE 300 sec\u003cbr data-mce-fragment=\"1\"\u003e36 light HA 600 sec\u003cbr data-mce-fragment=\"1\"\u003e36 light OIII 600 sec\u003cbr data-mce-fragment=\"1\"\u003eMontatura 10 Micron 1000 hps\u003cbr data-mce-fragment=\"1\"\u003eSoftware Voyager Astrophotography Automation\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cimg data-mce-fragment=\"1\" data-ll-status=\"loaded\" alt=\"\" src=\"https:\/\/www.optolong.com\/uploads\/images\/20211201\/ce882079db0e723d48abd5b89337cc5e.jpg\" class=\"lazyloaded\" data-mce-src=\"https:\/\/www.optolong.com\/uploads\/images\/20211201\/ce882079db0e723d48abd5b89337cc5e.jpg\" width=\"474\" height=\"323\"\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\"\u003eⅧ.\u003cu data-mce-fragment=\"1\"\u003e Rosette nebula © \u003ca data-mce-fragment=\"1\" href=\"https:\/\/www.facebook.com\/photo?fbid=2990297881231404\u0026amp;set=a.1385013411759867\" data-mce-href=\"https:\/\/www.facebook.com\/photo?fbid=2990297881231404\u0026amp;set=a.1385013411759867\"\u003eAndrea Andreotto Maggi Astrophoto\u003c\/a\u003e\u003ca data-mce-fragment=\"1\" href=\"https:\/\/www.facebook.com\/photo\/?fbid=10221694325160924\u0026amp;set=a.1349013078910\" data-mce-href=\"https:\/\/www.facebook.com\/photo\/?fbid=10221694325160924\u0026amp;set=a.1349013078910\"\u003e  \u003c\/a\u003e \u003c\/u\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eProve di post su vecchie riprese\u003cbr data-mce-fragment=\"1\"\u003eTelescopi o obiettivi di acquisizione: Sharpstar 76EDPH ·\u003cbr data-mce-fragment=\"1\"\u003eCamere zwo asi 071 MC zwo Asi 1600 MM zwo asi 2600 MC\u003cbr data-mce-fragment=\"1\"\u003eMontature: SkyWatcher EQ6 PRO GOTO\u003cbr data-mce-fragment=\"1\"\u003eFiltri: Optolong \u003cstrong data-mce-fragment=\"1\"\u003e2″ Ha O3 S2\u003c\/strong\u003e · Optolong L-Pro 2″ · Optolong L-eNhance\u003cbr data-mce-fragment=\"1\"\u003e58 light 300 sec\u003cstrong data-mce-fragment=\"1\"\u003e L-PRO\u003c\/strong\u003e\u003cbr data-mce-fragment=\"1\"\u003e70 light 600 sec \u003cstrong data-mce-fragment=\"1\"\u003eL-eNhance\u003c\/strong\u003e\u003cbr data-mce-fragment=\"1\"\u003e20 light 600 sec HA\u003cbr data-mce-fragment=\"1\"\u003e20 Light 600 sec OIII\u003cbr data-mce-fragment=\"1\"\u003e20 Light 600 sec SII\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cimg data-mce-fragment=\"1\" data-ll-status=\"loaded\" alt=\"\" src=\"https:\/\/www.optolong.com\/uploads\/images\/20211201\/ee5691a92bcf2b9f7a7ccf80c878359b.jpg\" class=\"lazyloaded\" data-mce-src=\"https:\/\/www.optolong.com\/uploads\/images\/20211201\/ee5691a92bcf2b9f7a7ccf80c878359b.jpg\" width=\"457\" height=\"332\"\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\"\u003eⅨ.\u003cu data-mce-fragment=\"1\"\u003e Ha3nm test © YaGe\u003ca data-mce-fragment=\"1\" href=\"https:\/\/www.facebook.com\/photo\/?fbid=10221694325160924\u0026amp;set=a.1349013078910\" data-mce-href=\"https:\/\/www.facebook.com\/photo\/?fbid=10221694325160924\u0026amp;set=a.1349013078910\"\u003e  \u003c\/a\u003e \u003c\/u\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eLens: SharpStar ACL200\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eCamera: ZWO ASI 6200 MM Pro\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eMount: iOptron CEM60\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eGuide: SharpStar ACL200\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eStar guide camera: ZWO ASI290MM mini\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eSoftware: Pleiades Astrophoto PixInisight ·Astro Pixel Processor\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eFilter: \u003cstrong data-mce-fragment=\"1\"\u003eOptolong Ha 3nm\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eCopyright：鸭哥\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cimg data-mce-fragment=\"1\" data-ll-status=\"loaded\" alt=\"\" src=\"https:\/\/www.optolong.com\/uploads\/images\/20211201\/1aa189a6260eac8d82b96ce1f393bea0.png\" class=\"lazyloaded\" data-mce-src=\"https:\/\/www.optolong.com\/uploads\/images\/20211201\/1aa189a6260eac8d82b96ce1f393bea0.png\" width=\"475\" height=\"616\"\u003e\u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eIn The Box\u003c\/h3\u003e\n\u003cp\u003eSulfur II, H-Alpha, Oxygen III Filters\u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eManuals \u0026amp; Warranty\u003c\/h3\u003e\n\u003cp\u003eOptolong 3-Years Warranty\u003c\/p\u003e","brand":"Optolong","offers":[{"title":"2\" Mounted","offer_id":43697803788517,"sku":"OL-SHO-3NM-2","price":1675.0,"currency_code":"CAD","in_stock":true},{"title":"36mm unmounted","offer_id":43697803821285,"sku":"OL-SHO-3NM-36","price":1340.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/optolong-sho-3nm-narrowband-filters-kit-astronomy-plus-1_c32687df-2fc2-4cb4-8d52-414b9db3f91e.png?v=1690487751"},{"product_id":"optolong-lrgb-filter-set","title":"Optolong LRGB Filter Set","description":"\u003ch1\u003eOptolong LRGB Filter Set\u003c\/h1\u003e\n\u003cp\u003eThe Optolong LRGB Filter Set is designed for maximum contrast and with extremely high gradients for clear differentiation of colors. The LRGB filter set divides the spectrum into its components Red, Green, Blue and Luminance. OIII emission overlaps on blue and green filters with maximum transmission to allow high efficiency and natural color imaging. Gap between green and red filters serves to block out the primary Sodium light pollution line at 589nm and improves color balance and separation.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eWork well with debayered monochrome CCD cameras.\u003c\/li\u003e\n\u003cli\u003eSuitable for deepsky and planetary CCD imaging.\u003c\/li\u003e\n\u003cli\u003eRGB-imaging allows equal weighting factors for each channel, very important for automated imaging.\u003c\/li\u003e\n\u003cli\u003eThe ideal raw material for image processing in the RGB color space is available with LRGB filter set and mono CCD camera.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eThickness: 2mm\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cp\u003eLuminance, Red, Green, Blue Filters\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":43697623924965,"sku":"OL-LRGB-1.25","price":320.0,"currency_code":"CAD","in_stock":true},{"title":"2\"","offer_id":43697623957733,"sku":"OL-LRGB-2","price":501.0,"currency_code":"CAD","in_stock":true},{"title":"31mm","offer_id":43697623990501,"sku":"OL-LRGB-31","price":349.0,"currency_code":"CAD","in_stock":true},{"title":"36mm","offer_id":43697624023269,"sku":"OL-LRGB-36","price":375.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/optolong-lrgb-filter-set-astronomy-plus_be87c5d4-887a-4869-8954-0765f408c477.jpg?v=1690488098"},{"product_id":"optolong-clscity-light-suppression-broadband-filter","title":"Optolong CLS(City Light Suppression) Broadband Filter","description":"\u003ch2\u003eOptolong CLS (City Light Suppression) Broadband Filter\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003e1.  Optolong CLS Introduction\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe CLS (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). 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 filter is suitable for enhancing the contrast and details for both visual and photograghic purpose at sub-rural area.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMain Use\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSuitable for color CCD cameras and unmodified DSLRs.\u003c\/p\u003e\n\u003cp\u003eCLS with wider pass-band than UHC and hence is more favored when observing under mild to moderate light pollution.\u003c\/p\u003e\n\u003cp\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\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\u003cstrong\u003e2. Optolong CLS Spectrum and Characteristic\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003eSbustrate: Optical glass\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: 400-700nm\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eBlcoking 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 data-mce-fragment=\"1\"\u003eIn the Box\u003cbr data-mce-fragment=\"1\"\u003e\n\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan\u003eFilter\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003e\u003cbr\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Optolong","offers":[{"title":"1.25\"","offer_id":43693201031397,"sku":"OL-CLS-125","price":77.0,"currency_code":"CAD","in_stock":true},{"title":"2\"","offer_id":43693201064165,"sku":"OL-CLS-2","price":119.0,"currency_code":"CAD","in_stock":true},{"title":"EOS-C","offer_id":46339833921765,"sku":"OL-CLS-EOSC","price":133.0,"currency_code":"CAD","in_stock":true},{"title":"EOS-FF","offer_id":46339850109157,"sku":"OL-CLS-EOSFF","price":161.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/optolong-cls-city-light-suppression-broadband-filter-astronomy-plus_1aaa9d09-d4d7-40f3-9581-691b1a81cbef.png?v=1690488207"},{"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":"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":"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":"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":"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":"optolong-hydrogen-alpha-narrowband-3nm","title":"Optolong Hydrogen Alpha Narrowband 3nm","description":"\u003ch1\u003eOptolong Hydrogen Alpha Narrowband 3nm\u003c\/h1\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cdiv class=\"prose\"\u003e\n\u003cp\u003eOriginal manufacturer description below. Improved description\/specifications coming soon.\u003c\/p\u003e\n\u003cp\u003eH-Alpha 3nm filter is the popular narrowband filter allowing 3nm 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 vapor lights and unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow). Better choice of narrowband H-Alpha astrophotographer filter for highest contrast and revealing subtle nebula details.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eGive you higher contrast and greater detailed viewing\u003c\/li\u003e\n\u003cli\u003eDecrease background noise and improve the contrast of objects\u003c\/li\u003e\n\u003cli\u003eIncrease the faint nebula signal to make it brighter\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable style=\"width: 100%; height: 529.2px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003cth style=\"width: 27.2812%; height: 19.6px;\"\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth style=\"width: 69.9362%; height: 19.6px;\"\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\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: 27.2812%; height: 19.6px;\"\u003e\u003cstrong\u003eModel \/ Part\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 69.9362%; height: 19.6px;\"\u003eOptolong H-Alpha 3 nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"width: 27.2812%; height: 19.6px;\"\u003e\u003cstrong\u003eType\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 69.9362%; height: 19.6px;\"\u003eNarrowband (line) filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.2px;\"\u003e\n\u003ctd style=\"width: 27.2812%; height: 39.2px;\"\u003e\u003cstrong\u003eCentral Wavelength (CWL)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 69.9362%; height: 39.2px;\"\u003e 656 nm (H-alpha)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.2px;\"\u003e\n\u003ctd style=\"width: 27.2812%; height: 39.2px;\"\u003e\u003cstrong\u003eFull Width at Half Maximum (FWHM)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 69.9362%; height: 39.2px;\"\u003e3 nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.2px;\"\u003e\n\u003ctd style=\"width: 27.2812%; height: 39.2px;\"\u003e\u003cstrong\u003eTransmission (Peak)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 69.9362%; height: 39.2px;\"\u003eHigh transmission\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"width: 27.2812%; height: 19.6px;\"\u003e\u003cstrong\u003eBlocking Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 69.9362%; height: 19.6px;\"\u003e~ 300–1000 nm (for related dual-band versions)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.2px;\"\u003e\n\u003ctd style=\"width: 27.2812%; height: 39.2px;\"\u003e\u003cstrong\u003eBlocking Depth \/ Optical Density\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 69.9362%; height: 39.2px;\"\u003e\u0026gt; OD4 (in related L-Ultimate filter)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"width: 27.2812%; height: 19.6px;\"\u003e\u003cstrong\u003eSubstrate Material\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 69.9362%; height: 19.6px;\"\u003eOptical glass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"width: 27.2812%; height: 19.6px;\"\u003e\u003cstrong\u003eGlass Thickness\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 69.9362%; height: 19.6px;\"\u003e2″ version: ~1.85 mm; 36 mm unmounted: ~2.0 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"width: 27.2812%; height: 19.6px;\"\u003e\u003cstrong\u003eSurface Quality\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 69.9362%; height: 19.6px;\"\u003e60\/40 (MIL-O-13830)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.2px;\"\u003e\n\u003ctd style=\"width: 27.2812%; height: 39.2px;\"\u003e\u003cstrong\u003eTransmitted Wavefront Error\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 69.9362%; height: 39.2px;\"\u003e~λ\/4 (manufacturer polishing)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"width: 27.2812%; height: 19.6px;\"\u003e\u003cstrong\u003eParallelism\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 69.9362%; height: 19.6px;\"\u003e\u0026lt; 30 arc-seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 58.8px;\"\u003e\n\u003ctd style=\"width: 27.2812%; height: 58.8px;\"\u003e\u003cstrong\u003eCoating Technology\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 69.9362%; height: 58.8px;\"\u003eIon-assisted deposition, multi-layer anti-reflection; non-cemented substrate; homogeneous coating via planetary rotation system\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.2px;\"\u003e\n\u003ctd style=\"width: 27.2812%; height: 39.2px;\"\u003e\u003cstrong\u003eFilter Cell \/ Mount\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 69.9362%; height: 39.2px;\"\u003eFor 2″ version: ultra-thin CNC-machined metal cell; for 36 mm version: unmounted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"width: 27.2812%; height: 19.6px;\"\u003e\u003cstrong\u003eClear Aperture\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 69.9362%; height: 19.6px;\"\u003e~45 mm for the 2″ version\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.2px;\"\u003e\n\u003ctd style=\"width: 27.2812%; height: 39.2px;\"\u003e\u003cstrong\u003eUse Case \/ Application\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 69.9362%; height: 39.2px;\"\u003eDeep-sky narrowband imaging (e.g., H-II regions, emission nebulae)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"width: 27.2812%; height: 19.6px;\"\u003e\u003cstrong\u003eLimitations \/ Warnings\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 69.9362%; height: 19.6px;\"\u003eNot designed for solar observation — do \u003cem\u003enot\u003c\/em\u003e use to view the Sun.\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- Optolong Hydrogen Alpha Narrowband 3nm\u003c\/p\u003e\n\u003ch3\u003e\n\u003cbr\u003e\u003cbr\u003eWarranty\u003c\/h3\u003e\n\u003cp\u003e\u003ca rel=\"noopener\" href=\"https:\/\/istronomyplus.com\/pages\/optolong-warranty\" target=\"_blank\"\u003eOptolong 3-year Warranty\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Optolong","offers":[{"title":"2\"","offer_id":48076724830437,"sku":"OPT-HA3-2","price":587.0,"currency_code":"CAD","in_stock":true},{"title":"36mm","offer_id":48076724863205,"sku":"OPT-HA3-36","price":475.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/ofil-ol-ha7-2in.webp?v=1763842639"},{"product_id":"optolong-l2-dual-combo-set-l-extreme-l-synergy-2","title":"Optolong L2 Dual-Combo Set (L-eXtreme\u0026L-Synergy) (2\")","description":"\u003ch1\u003eOptolong L2 Dual-Combo Set (L-eXtreme\u0026amp;L-Synergy)\u003c\/h1\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003eL2 Dual-Combo Set includes two premium filters: one L-eXtreme and one L-Synergy.\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;\"\u003eL-eXtreme:The L-eXtreme is a dual-narrowband filter (OIII-7nm \u0026amp; Ha-7nm) designed to exclusively transmit the key nebula emission lines of OIII (500.7nm) and Hα (656.3nm). By effectively blocking all other light pollution emission lines, it ensures that only the signals from OIII and Hα elements are captured during imaging, achieving maximum effective transmission. With years of technological refinement, it significantly optimizes the performance in suppressing bright star halos.\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;\"\u003eL-Synergy：The L-Synergy is a dual-narrowband filter (OIII-7nm \u0026amp; SII-7nm) that guarantees high transmission for both the SII (672.4nm) and OIII (500.7nm) spectral lines, while offering exceptional out-of-band rejection for all other wavelengths. By effectively blocking all other light pollution emission lines, it ensures that only the signals from OIII and SII elements are captured during imaging, achieving maximum effective transmission. With years of technological refinement, it significantly optimizes the performance in suppressing bright star halos.\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size: 20px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003e\u003cstrong\u003e1.  Why is L2 Dual-Combo Set?\u003c\/strong\u003e\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;\"\u003eThe L2 Dual-Combo Set is engineered to unleash the power of Hubble Palette imaging for color camera users, supporting telescope systems as fast as F3.3, and above ( slower system).\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;\"\u003eTailored specifically for color camera astrophotographers, this set includes two premium filters: OIII \u0026amp; Hα (L-eXtreme),OIII \u0026amp; SII (L-Synergy).\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;\"\u003eThis innovative combination breaks through the traditional limitations of narrowband imaging with color cameras. Without the need to switch to a monochrome camera or invest in an expensive SHO three-filter set, users can achieve stunning Hubble Palette images at a fraction of the cost and complexity.\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;\"\u003eThe core appeal of this combination design lies in lowering barriers and expanding possibilities for colour camera users: it preserves the equipment advantages of colour cameras while enabling users to unlock “Hubble-like” creative capabilities at minimal cost through minimalist filter combination. Simultaneously, it offers greater flexibility for astrophotography.\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;\"\u003eWhether capturing nebular detail or reproducing deep-sky colours, this combination enables richer creative expression, truly unlocking the full potential of colour cameras in deep-sky photography.\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size: 20px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003e\u003cstrong\u003e2.Optical Design\u003c\/strong\u003e\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;\"\u003eBased on the characteristics of celestial emission lines and light pollution emission lines, the L2 Dual-Combo Set preserves the distinctive colours of nebulae in OIII, Hα, and SII while filtering out the vast majority of light pollution. Specifically designed and optically optimized, its transmission profile is as follows:\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003e\u003cimg style=\"height: 371px; width: 800px;\" src=\"https:\/\/optolong.com\/uploads\/images\/20250924\/19ce3d5664886f96373832d4be8e8830.png\" alt=\"\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 style=\"text-align: left;\"\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003eTechnical Specifications\u003cbr\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003ctable cellspacing=\"0\" border=\"0\"\u003e\n\u003ccolgroup span=\"2\" width=\"85\"\u003e\u003c\/colgroup\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd height=\"17\" align=\"center\"\u003e\u003cb\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eParameter\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd align=\"center\"\u003e\u003cb\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eValue\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"47\" align=\"left\"\u003e\u003cb\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eProduct Name\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eOptolong L2 Dual-Combo Set\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"17\" align=\"left\"\u003e\u003cb\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eFilter Count\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003e2 filters\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"32\" align=\"left\"\u003e\u003cb\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eIncluded Filter 1\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eL-eXtreme\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"32\" align=\"left\"\u003e\u003cb\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eIncluded Filter 2\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eL-Synergy\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"32\" align=\"left\"\u003e\u003cb\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eL-eXtreme Passbands\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eOIII 500.7 nm, Hα 656.3 nm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"32\" align=\"left\"\u003e\u003cb\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eL-Synergy Passbands\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eOIII 500.7 nm, SII 672.4 nm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"32\" align=\"left\"\u003e\u003cb\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eBandwidth (FWHM)\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003e7 nm (all passbands)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"47\" align=\"left\"\u003e\u003cb\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eSupported Telescope Speed\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003ef\/3.3 and slower\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"32\" align=\"left\"\u003e\u003cb\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eCoating Type\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eMulti-layer anti-reflection\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"77\" align=\"left\"\u003e\u003cb\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eSubstrate Coating Type\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eNon-cementing optical substrate coating\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"47\" align=\"left\"\u003e\u003cb\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eCoating Technology\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eIon-assisted deposition (IAD)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"62\" align=\"left\"\u003e\u003cb\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eCWL Stability\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eNo deviation with temperature change\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"47\" align=\"left\"\u003e\u003cb\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eCoating Uniformity Method\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003ePlanetary rotation system\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"32\" align=\"left\"\u003e\u003cb\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eThread Specification\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eM48 × 0.75\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"17\" align=\"left\"\u003e\u003cb\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eFilter Size\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003e2\"\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"32\" align=\"left\"\u003e\u003cb\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eInner Plastic Box Material\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003ePP\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd height=\"32\" align=\"left\"\u003e\u003cb\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eLining Material\u003c\/span\u003e\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eHigh-pressure black EVA\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3 style=\"text-align: left;\"\u003e\n\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003e\u003c\/span\u003e\u003c\/span\u003e\n\u003c\/h3\u003e\n\u003ch3\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003eIn the Box\u003c\/span\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eOptolong L-eXtreme (2\")\u003c\/span\u003e\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;\"\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eOptolong L-Synergy (2\")\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003e\u003cbr\u003e\u003cbr\u003eWarranty\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/istronomyplus.com\/pages\/optolong-warranty\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cspan style=\"font-family: Arial,Helvetica,sans-serif;\"\u003e\u003cspan style=\"font-family: Liberation Serif;\"\u003eOptolong 3-Year Warranty\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"Optolong","offers":[{"title":"Default Title","offer_id":48076794396901,"sku":"OPT-L2-2","price":795.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/625ce0ff357eae9d0cd02396e639a230.jpg?v=1777043812"},{"product_id":"optolong-photometric-ubvrcic-filters","title":"Optolong Photometric UBVRcIc Filters","description":"\u003ch1\u003e Optolong Photometric UBVRcIc Filters \u003c\/h1\u003e\n\u003cdiv class=\"prose\"\u003e\n\u003cp\u003e\u003cstrong\u003e1. Photometric Filters \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\"Historically our Solid-State Photometers used custom filters designed to transform well to the Johnson photometry standards with our detectors.\"\u003c\/p\u003e\n\u003cp\u003eUBVRI filters are not for astrophotography. In fact, they are used to do photometry. So it’s in a more scientific application. In photometry, you measure the light coming from a star. By calibrating the data with reference stars, we’re able to get precise measurements on the flux coming out of a star. Combined with a measurement of the distance of the star (that is usually found by satellite to have precise measurements of far stars), we’re able to find fundamental parameters of the stars. Those fundamental parameters are usually the mass, the radius and the temperature of the star.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMain Use and Performance\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eUBVRcIc filters are not for astrophotography.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWARNING:\u003c\/strong\u003e 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\u003e \u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eOptical glass fine material\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eSpectrum: 300-1000nm\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eSurface Quality: 60\/40 (Refer to MIL-O-13830)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eFine-optically polished to ensure accurate 1\/4 wavefront and \u0026lt; 30 seconds parallelism over the both surfaces\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eHigh transmission at major nebula emission lines (i.e. H-alpha 656nm, OIII 496nm\u0026amp;500nm, SII 672nm and H-beta 486nm).\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003ePrecision off-band blocking, specifically the major emission lines of artificial light pollution (i.e. Na 589nm, Hg 435nm and 578nm).\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e2. UBVRcIc Photometrics Spectrum and \u003c\/strong\u003e\u003cstrong\u003eCharacteristic\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/2b0bc9b7f5c81ec90e88024fd27b821c.webp?v=1778686732\" alt=\"\"\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eHow to read the chart?\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eThe horizontal axis is the Wavelength in Nanometers(nm).\u003c\/li\u003e\n\u003cli\u003eThe vertical axis is transmission in %\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e3. Coating Technology\u003c\/strong\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 L-Pro 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\u003eOptolong Photometric UBVRcIc Filters\u003c\/p\u003e\n\u003ch3\u003e\n\u003cbr\u003e\u003cbr\u003eWarranty\u003c\/h3\u003e\n\u003cp\u003e\u003ca rel=\"noopener\" href=\"https:\/\/istronomyplus.com\/pages\/optolong-warranty\" target=\"_blank\"\u003eOptolong 3-year Warranty\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Optolong","offers":[{"title":"1.25\"","offer_id":49018980073701,"sku":"OPT-UBVRcIc-1.25","price":959.0,"currency_code":"CAD","in_stock":true},{"title":"2\"","offer_id":49018752991461,"sku":"OPT-UBVRcIc-2","price":1162.0,"currency_code":"CAD","in_stock":true},{"title":"36mm","offer_id":49018753024229,"sku":"OPT-UBVRcIc-36","price":1043.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/OptolongPhotometricUBVRcIcFilters_adf01a27-48ae-4a8f-a7db-29c44e69271b.webp?v=1778687138"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/collections\/optolong_logo.webp?v=1675438130","url":"https:\/\/istronomyplus.com\/collections\/optolong.oembed","provider":"Astronomy Plus – Telescopes \u0026 Astrophotography Canada","version":"1.0","type":"link"}