{"product_id":"antlia-alp-t-dual-band-5nm-sii-hb-filter-1","title":"Antlia ALP-T 2\" Dual Band 5nm SII \u0026 Hb Filter","description":"\u003ch1 data-mce-fragment=\"1\"\u003eAntlia ALP-T Dual Band 5nm SII\u0026amp;Hb Filter\u003c\/h1\u003e\n\u003cp\u003eThe ALP-T dual band 5nm SII\u0026amp;Hb filter is a dual line-pass filter, which lets the deep red Sulfur-II line and the blue Hydrogen-Beta line through and is used with one-shot color (OSC) cameras such as DSLR's or astronomical OSC cameras. It is a significant addition to the\u003cbr data-mce-fragment=\"1\"\u003epopular Antlia ALP-T dual band 5nm Ha\u0026amp;OIII filter and enables false-color images and narrow-band nebula images using OSC. When capturing data with this filter, the nebulae are recorded with greater contrast against the background than without it. The combination of these two dual band filters allows extreme narrow-band images with OSC cameras by capturing the spectral data from 4 channels i.e. Ha\/OIII\/SII\/Hb. The spectrum of these four channels can be separated and recombined into various colour palettes in your post-processing. The resulting images can be used for luminance contrast enhancement of traditional RGB-balanced images or creation of images in various popular false-color palettes such as H-O-Hb, S-H-O, H-S-OHb, H-O-O etc.\u003cbr data-mce-fragment=\"1\"\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e \u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eWhy design SII\u0026amp;Hb bands pass instead of OIII\u0026amp;SII bands?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003eThe filter is dedicated to capture H-beta and SII emission lines. We know that SII is singly ionized sulfur that emits light in the deep red part of the spectrum, beyond H-alpha, but the contribution of H-beta to emission lines in nebulae is frequently overlooked, even though it is the second most common Hydrogen emission after the H-alpha line. Capturing more OIII will boost the existing signal but does not give more information. However Hb has the potential to reveal structures not seen using OIII. The design is to capture the H-beta emission line in the certain nebulas that contain some blue spectrum, this cannot be captured by H-alpha, SII and OIII filters. Greater and richer details will be captured in many nebulae images to achieve results with a superior signal-to-noise ratio.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eIt is generally accepted that the OIII signal is a relatively weaker contributor to nebulae images. The OIII bandpass sensitivity is an important consideration for any nebulae filter. Most colour cameras (OSC) use a RGGB Bayer pattern. The allocation of twice as many green pixels as\u003cbr data-mce-fragment=\"1\"\u003ecompared to either red or blue pixels, enables a much-improved capture of the OIII signal. Furthermore, higher OIII signal can be achieved by additional exposure using the Antlia ALP-T Ha\u0026amp;O3 filter, then isolating the GB channels, followed by synthesis of an OIII channel to add into your stack.\u003cbr data-mce-fragment=\"1\"\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e In the situation where you may only want to add SII to your Ha\u0026amp;OIII data, then it may be preferable to buy one SII narrowband filter and achieve a cleaner SII spectral emission. However, our new filter design (SII\u0026amp;Hb) includes the H-beta emission line which provides a distinct improvement in nebulae contrast and improved feature separation in Hb areas.\u003cbr data-mce-fragment=\"1\"\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eAntlia ALP-T Dual Band 5nm Ha\u0026amp;OIII filter:\u003c\/strong\u003e Dual band filter with a very narrow passband of 5nm in OIII and H-alpha to achieve a higher signal-to-noise ratio. The resulting contrast improvement for OSC is impressive.\u003cbr data-mce-fragment=\"1\"\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eAntlia ALP-T Dual Band 5nm SII\u0026amp;Hb filter:\u003c\/strong\u003e Dual band filter with a very narrow pass band of 5nm H-beta and S-II. This filter is ideal for increasing contrast of nebulae that emit in the sulfur and H-beta range using OSC. It provides additional feature separation and isolation in Hb areas.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eThe advanced multi-coatings on Antlia ALP-T dual band filters effectively isolates the red, Ha line, blue-green, OIII line, deep red SII and the blue H-beta lines from emission nebulae, with almost total suppression of optical density (OD)4.5 on unwanted wavelengths from light pollution, moonlight, and airglow. The result is that both the ALP-T dual band 5nm Ha\u0026amp;OIII and SII\u0026amp;Hb filter creates a superior signal-to-noise ratio and better contrast in your OSC images.\u003cbr data-mce-fragment=\"1\"\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eThe main features and application\u003c\/strong\u003e\u003cbr data-mce-fragment=\"1\"\u003ePasses SII 672.4nm line and H-Beta 486.1nm line;\u003cbr data-mce-fragment=\"1\"\u003eEngineered specifically for use with DSLR, CMOS, and CCD color cameras;\u003cbr data-mce-fragment=\"1\"\u003eUltra FWHM 5nm allows for increasing in exposure time;\u003cbr data-mce-fragment=\"1\"\u003eRecommended to be used with ALP-T Dual Band 5nm Ha\u0026amp;OIII filter to create images with better signal to noise and better isolation between the 4 channels;\u003cbr data-mce-fragment=\"1\"\u003eSuppression of optical density (OD)4.5 on unwanted wavelengths improves signal-to-noise;\u003cbr data-mce-fragment=\"1\"\u003eExtremely steep bandpass and blackened edges of unmounted sizes to minimize internal reflections;\u003cbr data-mce-fragment=\"1\"\u003eIdeal flat-top and moderate bandpass reducing spectrum down shifts;\u003cbr data-mce-fragment=\"1\"\u003eIon Gun Assisted Deposition coating technology on the double-sided polished substrate making it the most consistent and accurate light pollution suppression filter;\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eNot Recommended:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eSolar imaging\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eNight visual observation\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eNot Permitted:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eDO NOT LOOK AT THE SUN WITH THIS FILTER\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eSerious eye damage will result if you fail to observe the warning\u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eTechnical Specifications \u003cbr data-mce-fragment=\"1\"\u003e\n\u003c\/h3\u003e\n\u003ctable align=\"LEFT\" border=\"1\" width=\"585px\" data-mce-fragment=\"1\"\u003e\n\u003ctbody data-mce-fragment=\"1\"\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd valign=\"top\" width=\"22.6%\" data-mce-fragment=\"1\"\u003e\u003c\/td\u003e\n\u003ctd valign=\"top\" width=\"25.3%\" data-mce-fragment=\"1\"\u003eSulfur-II\u003c\/td\u003e\n\u003ctd valign=\"top\" width=\"24.7%\" data-mce-fragment=\"1\"\u003eHydrogen-Beta\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd valign=\"top\" width=\"22.6%\" data-mce-fragment=\"1\"\u003eFWHM\u003c\/td\u003e\n\u003ctd valign=\"top\" width=\"25.3%\" data-mce-fragment=\"1\"\u003e5nm\u003c\/td\u003e\n\u003ctd valign=\"top\" width=\"24.7%\" data-mce-fragment=\"1\"\u003e5nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd valign=\"top\" width=\"22.6%\" data-mce-fragment=\"1\"\u003eCWL (Central Wavelength)\u003c\/td\u003e\n\u003ctd valign=\"top\" width=\"25.3%\" data-mce-fragment=\"1\"\u003e672.4nm\u003c\/td\u003e\n\u003ctd valign=\"top\" width=\"24.7%\" data-mce-fragment=\"1\"\u003e486.1nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd valign=\"top\" width=\"22.6%\" data-mce-fragment=\"1\"\u003ePeak Transmission\u003c\/td\u003e\n\u003ctd valign=\"top\" width=\"25.3%\" data-mce-fragment=\"1\"\u003e90%\u003c\/td\u003e\n\u003ctd valign=\"top\" width=\"24.7%\" data-mce-fragment=\"1\"\u003e85%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd valign=\"top\" width=\"22.6%\" data-mce-fragment=\"1\"\u003eBlocking\u003c\/td\u003e\n\u003ctd valign=\"top\" rowspan=\"1\" colspan=\"2\" data-mce-fragment=\"1\"\u003e≥OD4.5 \u003cbr data-mce-fragment=\"1\"\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd valign=\"top\" width=\"22.6%\" data-mce-fragment=\"1\"\u003eFilter Thickness\u003c\/td\u003e\n\u003ctd valign=\"top\" colspan=\"2\" data-mce-fragment=\"1\"\u003e2mm+\/-0.05mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp data-mce-fragment=\"1\"\u003e \u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eFilter Ring:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e2” (M48*0.75)\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eUltra-thin filter cell to minimize vignetting by maximize possible clear aperture\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eBlack Anodized Finish\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eLaser Engraving No Fading\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eIn the Box\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003eAntlia ALP-T Dual Band 5nm SII\u0026amp;Hb Filter\u003c\/p\u003e\n\u003cdiv class=\"value\" data-mce-fragment=\"1\"\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eWarranty \u0026amp; Manuals\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003eAntlia \u003cspan data-mce-fragment=\"1\"\u003e3-Years Against Delamination\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":44097503002853,"sku":"AF-ALP-T-2-SIIHB","price":497.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/antlia-alp-t-2-dual-band-5nm-siiandhb-filter-astronomy-plus-1.webp?v=1690490638","url":"https:\/\/istronomyplus.com\/products\/antlia-alp-t-dual-band-5nm-sii-hb-filter-1","provider":"Astronomy Plus – Telescopes \u0026 Astrophotography Canada","version":"1.0","type":"link"}