{"product_id":"antlia-2-5nm-sho-ultra-filter-2-mounted","title":"Antlia 2.5nm SHO Ultra Narrowband Filters 2’’ \u0026 36mm","description":"\u003ch1\u003eAntlia 2.5nm SHO Ultra Filter 2’’ \u0026amp; 36mm\u003c\/h1\u003e\n\u003cp\u003eThe Antlia SHO 2.5nm Ultra series filters are made with quartz glass and undergo precisely controlled coating processes to ensure optimal performance. The 2.5nm Ultra series is designed with a FWHM (full width half maximum) of 2.5nm +0.3\/-0.1nm and a transmission efficiency \u0026gt;93-95% at the Central Wavelength.\u003cbr\u003e\u003cbr\u003e\u003cbr\u003eThe quartz glass possesses an ultra-low thermal expansion coefficient with outstanding thermal and mechanical properties. When combined with advanced coating processes, these filters exhibit remarkable durability for imaging and research in the most challenging environmental conditions.\u003cbr\u003e\u003cbr\u003e\u003cbr\u003eCompared to the 3nm Pro series, the 2.5nm Ultra series coated on quartz glass exhibits higher transmittance with Ha\/SII≥95% and OIII≥93%. These filters are estimated to improve signal by 20-30% in your images. Additionally, the Ultra series boasts a narrower FWHM of 2.5nm+0.3\/-0.1nm, resulting in an exceptionally high Signal to Noise Ratio for deep sky photography.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThe main features and application:\u003c\/strong\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e- High transmittance （Ha\/SII≥95%，OIII≥93%）and the narrow FWHM 2.5nm +0.3\/-0.1nm to maximize contrast;\u003c\/li\u003e\n\u003cli\u003e- Flat-top spectrum minimizes the loss in transmission due to the Center Wavelength (CWL)-shift;\u003c\/li\u003e\n\u003cli\u003e- Out of band blocking specification is designed to OD5 (0.001%) to block interference from other wavelengths and minimize halos around bright stars;\u003c\/li\u003e\n\u003cli\u003e- Made of quartz glass, excellent durability and thermal stability, better fracture resistance and scratch resistance, improved coating resilience to cleaning;\u003c\/li\u003e\n\u003cli\u003e- Filters are resistant to scratches；\u003c\/li\u003e\n\u003cli\u003e- Identical filter thickness to existing standards and double-sided fine polishing , with utmost care for parfocality;\u003c\/li\u003e\n\u003cli\u003e- The SHO 2.5nm Ultra filters are recommended for use in optics with a Focus Ratio of ≥ f\/3.5 for best optical performance;\u003c\/li\u003e\n\u003cli\u003e- 100% of production are scanned individually, all transmission and blocking (OD) data in the box are actual, measured spectra and transmission；\u003c\/li\u003e\n\u003cli\u003e- All Antlia filters are coated to the edge of the substrate and unmounted narrowband filters are edge blackened to eliminate internal reflections from stray light；\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFilter Ring:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eAntlia standard ring: 2’’(M48*0.75)\u003c\/p\u003e\n\u003cp\u003eUltra-thin filter cell to minimize vignetting by maximize possible clear aperture\u003c\/p\u003e\n\u003cp\u003eBlack Anodized Finish\u003c\/p\u003e\n\u003cp\u003eLaser Engraving No Fading\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNot Recommended:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSolar imaging\u003c\/p\u003e\n\u003cp\u003eNight visual observation\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNot Permitted:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eDO NOT LOOK AT THE SUN WITH THIS FILTER\u003c\/p\u003e\n\u003cp\u003eSerious eye damage will result if you fail to observe the warning.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSpectrum Curves:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"text-size-adjust: 100%; margin: 0px 0px 1px; color: #666666; font-family: 微软雅黑; font-size: 14px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: #ffffff; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;\"\u003e\u003cspan style=\"text-size-adjust: 100%; font-size: 13px; font-family: Arial;\"\u003e\u003c\/span\u003e\u003cimg style=\"text-size-adjust: 100%; border: 0px; vertical-align: top; max-width: 100%; height: auto !important;\" class=\"need_fix\" alt=\"Ha 2.5nm ultra.jpg\" src=\"http:\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAgg_S1owYo3c-58wQwwQo4-wU.jpg\" width=\"1345\" height=\"767\"\u003e\u003cimg style=\"text-size-adjust: 100%; border: 0px; vertical-align: top; max-width: 100%; height: auto !important;\" class=\"need_fix\" alt=\"OIII 2.5nm ultra.jpg\" src=\"http:\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAgg_S1owYorqjy_wEwwQo4-wU.jpg\" width=\"1345\" height=\"767\"\u003e\u003cimg style=\"text-size-adjust: 100%; border: 0px; vertical-align: top; max-width: 100%; height: auto !important;\" class=\"need_fix\" alt=\"SII 2.5nm ultra.jpg\" src=\"http:\/\/20564242.s21i.faiusr.com\/2\/2\/ABUIABACGAAgg_S1owYoxoH3HjDDCjiABg.jpg\" width=\"1347\" height=\"768\"\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cbr\u003e\u003c\/h3\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ctable style=\"border-collapse: collapse; font-family: Calibri; font-size: 11pt; color: #000; background-color: transparent;\" 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cellspacing=\"0\" cellpadding=\"0\"\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 14.25pt;\"\u003e\n\u003ctd style=\"width: 47.727272727272734pt; white-space: nowrap; text-align: left; vertical-align: top; border-right: 1px solid #000000; border-left: 1px solid #000000; border-top: 1px solid #000000;\"\u003e\u003cspan style=\"font-family: Times New Roman; font-size: 10pt; vertical-align: baseline;\"\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 47.727272727272734pt; white-space: normal; text-align: center; vertical-align: top; border: 1px solid #000000;\" rowspan=\"2\" colspan=\"1\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003eHydrogen-alpha\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 47.727272727272734pt; white-space: normal; text-align: center; vertical-align: top; border: 1px solid #000000;\" rowspan=\"2\" colspan=\"1\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003eSulfur-II\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 47.727272727272734pt; white-space: normal; text-align: center; vertical-align: top; border: 1px solid #000000;\" rowspan=\"2\" colspan=\"1\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003eOxygen III\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 14.25pt;\"\u003e\n\u003ctd style=\"width: 47.727272727272734pt; white-space: nowrap; vertical-align: bottom; border-right: 1px solid #000000;\"\u003e\u003cspan style=\"vertical-align: baseline;\"\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 38.25pt;\"\u003e\n\u003ctd style=\"width: 47.727272727272734pt; white-space: normal; text-align: center; vertical-align: top; border-right: 1px solid #000000; border-bottom: 1px solid #000000; border-left: 1px solid #000000;\"\u003e\u003cspan style=\"font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003eFWHM\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 47.727272727272734pt; white-space: normal; text-align: center; vertical-align: top; border: 1px solid #000000;\"\u003e\u003cspan style=\"color: #4b4b4b; font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003e2.5nm +0.3\/-0.1nm\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 47.727272727272734pt; white-space: normal; text-align: center; vertical-align: top; border: 1px solid #000000;\"\u003e\u003cspan style=\"color: #4b4b4b; font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003e2.5nm +0.3\/-0.1nm\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 47.727272727272734pt; white-space: normal; text-align: center; vertical-align: top; border: 1px solid #000000;\"\u003e\u003cspan style=\"color: #4b4b4b; font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003e2.5nm +0.3\/-0.1nm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 51pt;\"\u003e\n\u003ctd style=\"width: 47.727272727272734pt; white-space: normal; text-align: center; vertical-align: top; border: 1px solid #000000;\"\u003e\u003cspan style=\"color: #4b4b4b; font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003eCWL (Central Wavelength)\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 47.727272727272734pt; white-space: normal; text-align: center; vertical-align: top; border: 1px solid #000000;\"\u003e\u003cspan style=\"color: #4b4b4b; font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003e656.3nm\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 47.727272727272734pt; white-space: normal; text-align: center; vertical-align: top; border: 1px solid #000000;\"\u003e\u003cspan style=\"color: #4b4b4b; font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003e672.4nm\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 47.727272727272734pt; white-space: normal; text-align: center; vertical-align: top; border: 1px solid #000000;\"\u003e\u003cspan style=\"color: #4b4b4b; font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003e500.7nm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 38.25pt;\"\u003e\n\u003ctd style=\"width: 47.727272727272734pt; white-space: normal; text-align: center; vertical-align: top; border: 1px solid #000000;\"\u003e\u003cspan style=\"color: #4b4b4b; font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003ePeak Transmission\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 47.727272727272734pt; white-space: normal; text-align: center; vertical-align: top; border: 1px solid #000000;\"\u003e\u003cspan style=\"color: #4b4b4b; font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003e95%\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 47.727272727272734pt; white-space: normal; text-align: center; vertical-align: top; border: 1px solid #000000;\"\u003e\u003cspan style=\"color: #4b4b4b; font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003e95%\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 47.727272727272734pt; white-space: normal; text-align: center; vertical-align: top; border: 1px solid #000000;\"\u003e\u003cspan style=\"color: #4b4b4b; font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003e93%\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 14.25pt;\"\u003e\n\u003ctd style=\"width: 47.727272727272734pt; white-space: normal; text-align: center; vertical-align: top; border: 1px solid #000000;\"\u003e\u003cspan style=\"color: #4b4b4b; font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003eBlocking\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 143.1818181818182pt; white-space: normal; text-align: center; vertical-align: top; border: 1px solid #000000;\" rowspan=\"1\" colspan=\"3\"\u003e\u003cspan style=\"color: #4b4b4b; font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003e≥OD5\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 38.25pt;\"\u003e\n\u003ctd style=\"width: 47.727272727272734pt; white-space: normal; text-align: center; vertical-align: top; border: 1px solid #000000;\"\u003e\u003cspan style=\"color: #4b4b4b; font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003eFilter Thickness\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 143.1818181818182pt; white-space: normal; text-align: center; vertical-align: top; border: 1px solid #000000;\" rowspan=\"1\" colspan=\"3\"\u003e\u003cspan style=\"color: #4b4b4b; font-family: Arial; font-size: 10pt; font-weight: bold; vertical-align: baseline;\"\u003e2mm+\/-0.05mm\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\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cp\u003eSelected Filters\u003cbr\u003e\u003c\/p\u003e\n\u003cdiv class=\"value\"\u003e\n\u003ch3\u003eWarranty \u0026amp; Manuals\u003c\/h3\u003e\n\u003cp\u003eAntlia 3-Years Warranty against Delamination\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Antlia","offers":[{"title":"H-alpha \/ 2\"","offer_id":44108918751461,"sku":"AF-HA-ULTRA25-2","price":837.0,"currency_code":"CAD","in_stock":true},{"title":"H-alpha \/ 36mm","offer_id":46326660071653,"sku":"AF-HA-ULTRA25-36","price":660.0,"currency_code":"CAD","in_stock":true},{"title":"Sulfur-II \/ 2\"","offer_id":44108918784229,"sku":"AF-SII-ULTRA25-2","price":837.0,"currency_code":"CAD","in_stock":true},{"title":"Sulfur-II \/ 36mm","offer_id":46326660104421,"sku":"AF-SII-ULTRA25-36","price":660.0,"currency_code":"CAD","in_stock":true},{"title":"Oxygen III \/ 2\"","offer_id":44108918816997,"sku":"AF-OIII-ULTRA25-2","price":837.0,"currency_code":"CAD","in_stock":true},{"title":"Oxygen III \/ 36mm","offer_id":46326660137189,"sku":"AF-OIII-ULTRA25-36","price":660.0,"currency_code":"CAD","in_stock":true},{"title":"SHO Filter Set \/ 2\"","offer_id":44108918882533,"sku":"AF-SHO-ULTRA25-2","price":2511.0,"currency_code":"CAD","in_stock":true},{"title":"SHO Filter Set \/ 36mm","offer_id":46326660169957,"sku":"AF-SHO-ULTRA25-36","price":1980.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/antlia-2-5nm-sho-ultra-narrowband-filters-2-mounted-astronomy-plus.webp?v=1690491120","url":"https:\/\/istronomyplus.com\/products\/antlia-2-5nm-sho-ultra-filter-2-mounted","provider":"Astronomy Plus – Telescopes \u0026 Astrophotography Canada","version":"1.0","type":"link"}