{"product_id":"antlia-lrgbr-dark-series-filter-set","title":"Antlia LRGBR+ Dark Series Filter Set","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eFive-filter LRGBR+ Dark Series set\u003c\/li\u003e\n\u003cli\u003eFull-spectrum 390nm to 1000nm spectral coverage\u003c\/li\u003e\n\u003cli\u003eDedicated R+ filter captures near-infrared signal from 700-1000nm\u003c\/li\u003e\n\u003cli\u003ePeak transmission of \u0026gt;=97% for L, R, G filters and \u0026gt;=95% for B filter\u003c\/li\u003e\n\u003cli\u003eOut-of-band blocking at OD4.5 (0.005%) to minimize halos around bright stars\u003c\/li\u003e\n\u003cli\u003eDurable quartz glass substrate for thermal stability\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eAntlia LRGBR+ Dark Series Filter Set\u003c\/h2\u003e\n\u003cp\u003eThe Antlia LRGBR+ Dark Series Filter Set uses a full-spectrum design covering 390nm to 1000nm, sensitive to both UV and IR light, for high signal-to-noise ratio and contrast in deep-sky imaging. This five-filter set includes a dedicated R+ filter with a 700-1000nm passband, which Antlia adds to capture valuable near-infrared signals that regular LRGB filters cannot detect. With peak transmission rates of ≥97% for LRG filters and ≥95% for the B filter, combined with OD4.5 out-of-band blocking, Antlia says this ensures almost no loss in image signal, maximizing contrast, while minimizing halos around bright stars.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eFull-Spectrum Design: Capturing Near-Infrared Signal from 700-1000nm\u003c\/h3\u003e\n\u003cp\u003eUnlike standard LRGB filters that cut off around 700nm, the Antlia Dark Series is designed for full-spectrum imaging from 390nm to 1000nm. The inclusion of the R+ filter, which isolates the 700-1000nm near-infrared band, captures near-infrared signal where cameras still have high quantum efficiency (QE). In post-processing, combine the R and R+ channels to create a new R channel; the remaining processing steps are the same as for regular LRGB filters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eOD4.5 Blocking and ≥97% Transmission for High-Contrast Results\u003c\/h3\u003e\n\u003cp\u003eTo ensure maximum signal and clean data, the L, R, and G filters achieve a peak transmission of ≥97%, while the B filter reaches ≥95%. Antlia says this ensures that there is almost no loss in image signal, maximizing contrast. Out-of-band light is blocked to OD4.5, which passes only 0.005% outside the passbands, to block interference from other wavelengths and minimize halos around bright stars.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eQuartz Glass Substrate and 3-Year Delamination Warranty\u003c\/h3\u003e\n\u003cp\u003eEach filter in the Dark Series is built on a quartz glass substrate, chosen for its extremely low coefficient of thermal expansion. Antlia states it gives excellent durability and thermal stability, better fracture and scratch resistance and improved coating resilience to cleaning, for imaging in challenging environmental conditions. All Antlia filters are coated to the edge of the substrate, unmounted sizes are edge blackened to eliminate internal reflections from stray light, and the set carries a 3-year warranty against delamination.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eBetter Parfocality with Antlia 2.5nm Ultra Narrowband Filters\u003c\/h3\u003e\n\u003cp\u003eFor imagers building a complete filter collection, Antlia says the LRGBR+ Dark Series is best paired with its SHO 2.5nm Ultra narrowband filters: both use the same quartz substrate and refractive index, resulting in better parfocality. The filters also have an identical thickness to existing standards and double-sided fine polishing, with care for parfocality.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the purpose of the R+ filter in the Antlia LRGBR+ Dark Series set?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe R+ filter is a near-infrared pass filter covering \u003cstrong\u003e700-1000nm\u003c\/strong\u003e. Antlia includes it because cameras have high quantum efficiency in the near-infrared, so it captures valuable signals that regular LRGB filters cannot detect. In post-processing, the R and R+ data are combined to create a new R channel.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I process images taken with the Antlia LRGBR+ filters?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAntlia says the workflow is identical to regular LRGB processing apart from one extra step. You first combine your calibrated \u003cstrong\u003eR and R+ frames\u003c\/strong\u003e to create a new R channel. After that, you proceed with standard LRGB combination and processing using your new R frame alongside the L, G, and B frames.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy does the Antlia LRGBR+ Dark Series use a quartz glass substrate?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eQuartz glass\u003c\/strong\u003e has an ultra-low thermal expansion coefficient, which Antlia says gives exceptional thermal and mechanical properties. Antlia lists excellent durability and thermal stability, better fracture and scratch resistance and improved coating resilience to cleaning.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eAre the Antlia LRGBR+ filters parfocal with other Antlia filters?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAntlia says they are best paired with the \u003cstrong\u003eAntlia SHO 2.5nm Ultra narrowband filter series\u003c\/strong\u003e: both use the same quartz substrate and refractive index, resulting in better parfocality. Antlia does not promise that no refocusing is needed, so check focus when switching filters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan the Antlia R+ filter be ordered on its own?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. Antlia states that the LRGBR+ Dark series set, the LRGB Dark series set and the R+ filter can be ordered individually. The R+ filter covers \u003cstrong\u003e700-1000nm\u003c\/strong\u003e, so it can be added to an LRGB Dark set later.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Antlia LRGBR+ Dark filters for visual observation or solar imaging?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eNo.\u003c\/strong\u003e Antlia lists solar imaging and night visual observation as not recommended, and warns: DO NOT LOOK AT THE SUN WITH THIS FILTER. Serious eye damage will result if you fail to observe the warning.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Type\u003c\/td\u003e\n\u003ctd\u003eLRGB + Red+ (LRGBR+) Dark series set\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilters in Set\u003c\/td\u003e\n\u003ctd\u003eLuminance, Red, Green, Blue, Red+\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpectral Coverage\u003c\/td\u003e\n\u003ctd\u003e390nm to 1000nm (full spectrum)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eR+ Filter Passband\u003c\/td\u003e\n\u003ctd\u003e700-1000nm (near-infrared)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePeak Transmission\u003c\/td\u003e\n\u003ctd\u003eL, R, G: \u0026gt;=97%; B: \u0026gt;=95%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking\u003c\/td\u003e\n\u003ctd\u003eOD4.5 (0.005%) out of band\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSubstrate\u003c\/td\u003e\n\u003ctd\u003eQuartz glass, double-sided fine polishing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParfocality\u003c\/td\u003e\n\u003ctd\u003eBest paired with Antlia SHO 2.5nm Ultra filters (same quartz substrate and refractive index) for better parfocality\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEdge Treatment\u003c\/td\u003e\n\u003ctd\u003eCoated to the edge; unmounted sizes are edge blackened\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAvailable Sizes\u003c\/td\u003e\n\u003ctd\u003e36mm Round Unmounted, 2\" Mounted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Ring (2\" Mounted)\u003c\/td\u003e\n\u003ctd\u003e2\" (M48x0.75), ultra-thin black anodized cell, laser engraved\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNot Recommended For\u003c\/td\u003e\n\u003ctd\u003eSolar imaging, night visual observation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e3-years against delamination\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n3-Year Warranty against delamination from Antlia.\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Antlia","offers":[{"title":"36mm Round Unmounted","offer_id":51932624748829,"sku":"ANT-LRGBR-DARK-RD36","price":500.0,"currency_code":"USD","in_stock":true},{"title":"2\" Mounted","offer_id":51932624781597,"sku":"ANT-LRGBR-DARK-2","price":680.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/antlia-src-oxImDzAIw6Ac46Ac_1f99725b-ed07-42da-8432-19f0e952c3bc.jpg?v=1792549997","url":"https:\/\/davidastro.com\/fr-int\/products\/antlia-lrgbr-dark-series-filter-set","provider":"David Astro","version":"1.0","type":"link"}