{"title":"SVBONY Narrowband Filters","description":"\u003cp\u003eEvery SVBONY narrowband filter we carry: SV220 7nm dual-band sets for colour cameras, SV227 5nm SHO filters for mono, and SV115 and SV132 nebula filters. Part of \u003ca href=\"\/collections\/narrowband-filters\"\u003eNarrowband Filters\u003c\/a\u003e.\u003c\/p\u003e","products":[{"product_id":"svbony-sv132-2-h-beta-filter","title":"SVBONY SV132 2″ H-Beta 25nm Visual Nebula Filter","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387029296852401851663295.jpg\" alt=\"SVBONY SV132 2 inch H-Beta filter key visual\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe SVBONY SV132 is a 2″ H-Beta narrowband filter for visual observing. It passes a 25 nm ± 2 nm band centred on 486 nm ± 2 nm — the hydrogen-beta emission line — at a published 90% peak transmission, and blocks to OD3 across 300–1100 nm. The filter is coated on a 1.85 mm B270 substrate with a 44 mm clear aperture, 60\/40 surface quality and 1\/4λ surface parallelism, mounted in a metal cell with standard 2″ threads.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387029138875923094057798.jpg\" alt=\"SVBONY SV132 2 inch H-Beta filter 486nm passband\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you observe faint emission nebulae visually through a larger-aperture telescope under dark skies, and want the handful of objects that shine mainly in H-beta — the Horsehead, California and Cocoon nebulae among them — to stand out from the background.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e486 nm H-beta passband:\u003c\/strong\u003e 25 nm FWHM isolates the blue hydrogen-beta line and suppresses the rest of the visible spectrum.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e90% peak transmission:\u003c\/strong\u003e keeps as much of the target's light as possible at the eyepiece.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOD3 blocking, 300–1100 nm:\u003c\/strong\u003e broad out-of-band suppression.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eB270 substrate, 1.85 mm:\u003c\/strong\u003e 60\/40 surface quality, 1\/4λ surface parallelism, 30″ parallelism.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e44 mm clear aperture:\u003c\/strong\u003e sized for 2″ eyepieces and diagonals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMetal cell with 2″ threads:\u003c\/strong\u003e precise threading that seals against light leaks.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387029297672830308590636.jpg\" alt=\"SVBONY SV132 2 inch H-Beta filter nebula targets\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387029298407016527982995.jpg\" alt=\"SVBONY SV132 2 inch H-Beta filter coating and substrate\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Horsehead Nebula (B33)\u003c\/strong\u003e against the IC 434 glow — the classic H-beta target.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe California Nebula (NGC 1499)\u003c\/strong\u003e, whose large, faint outline benefits from a low-power 2″ eyepiece.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Cocoon Nebula (IC 5146)\u003c\/strong\u003e and other H-beta-bright emission regions.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThreads:\u003c\/strong\u003e standard 2″ filter thread; screws into 2″ eyepiece barrels and threaded 2″ diagonal nosepieces.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAperture:\u003c\/strong\u003e SVBONY recommends a large-aperture telescope; small apertures do not gather enough light for these faint targets through a narrow passband.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSky:\u003c\/strong\u003e the target nebulae are best seen from dark sites.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNeed the 1.25″ size?\u003c\/strong\u003e SVBONY also makes the SV132 H-Beta in 1.25″.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387029299118711613838191.jpg\" alt=\"SVBONY SV132 2 inch H-Beta filter cell and thread\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecialist filter:\u003c\/strong\u003e H-beta enhances a short list of objects. For broader nebula work, an OIII or UHC-type filter covers more targets.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAperture matters:\u003c\/strong\u003e SVBONY does not recommend it for small-aperture telescopes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVisual filter:\u003c\/strong\u003e it is designed for eyepiece use.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. It threads onto the barrel of a 2″ eyepiece or into the nosepiece of a threaded 2″ diagonal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat can I see with an H-Beta filter?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eMainly emission nebulae that are bright in hydrogen-beta, such as the Horsehead, California and Cocoon nebulae.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat size telescope do I need?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eSVBONY recommends a large-aperture telescope; small apertures are not recommended with this filter.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill it help in light-polluted skies?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eIts targets are best observed from dark sites; the filter boosts contrast on them but does not replace a dark sky.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 2″, 25 nm H-Beta filter at 486 nm with 90% peak transmission, made for bringing out the Horsehead, California and Cocoon nebulae in a larger telescope under dark skies.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003ePerformance Data\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eSVBONY's published transmission data for the SV132:\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387037662225298411081831.jpg\" alt=\"SVBONY SV132 2 inch H-Beta filter transmission curve\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"Default Title","offer_id":67722198351983,"sku":"W9102B","price":74.95,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/1_20250806114107_5087_20260810145311_1602.webp?v=1791669990"},{"product_id":"svbony-sv115-1-25-oiii-18nm-filter","title":"SVBONY SV115 1.25″ OIII 18nm Narrowband Filter","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/1_20250806114205_1998_20260810140508_1030.webp?v=1791670161\" alt=\"SVBONY SV115 1.25″ OIII 18nm filter\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe SVBONY SV115 1.25″ (item F9186A) is an O-III narrowband filter with an 18 ± 2 nm passband. It transmits 90% at the 495.9 nm and 500.7 nm doubly-ionized oxygen lines and blocks across 400–700 nm, using dichroic interference and anti-reflection coatings on 1.85 mm glass. It threads into any 1.25″ eyepiece or diagonal.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you observe emission and planetary nebulae visually and want more contrast between the nebula and the sky background, including on bright targets such as M42 from light-polluted locations.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/2_20250806114205_1676.jpg?v=1791670162\" alt=\"SVBONY SV115 1.25″ OIII filter\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e18 ± 2 nm FWHM:\u003c\/strong\u003e centred on the O-III emission lines.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e90% transmission\u003c\/strong\u003e at 495.9 nm and 500.7 nm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e400–700 nm blocking:\u003c\/strong\u003e suppresses the rest of the visible spectrum.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eDichroic interference and anti-reflection coatings.\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.85 mm glass\u003c\/strong\u003e in a standard 1.25″ cell.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003ePlanetary nebulae and many emission nebulae radiate strongly in the two O-III lines near 500 nm. By passing an 18 nm band around them and blocking the rest, the filter darkens the sky background far more than the nebula, so the object stands out. It increases contrast rather than brightness, which is why SVBONY recommends larger apertures under dark, clear skies with good seeing for the best results.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlanetary nebulae\u003c\/strong\u003e such as the Ring and Dumbbell.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEmission nebulae\u003c\/strong\u003e with strong O-III emission.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBright nebulae like M42\u003c\/strong\u003e under light pollution.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/3_20250806114205_1996.jpg?v=1791670162\" alt=\"SVBONY SV115 1.25″ OIII filter cell\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 1.25″, threads into 1.25″ eyepieces and diagonals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2″ version:\u003c\/strong\u003e SVBONY also makes the SV115 in 2″ as a separate product.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eContrast, not brightness:\u003c\/strong\u003e the filter dims stars and sky along with blocking light pollution; the nebula stands out because the background darkens more.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNarrowband target list:\u003c\/strong\u003e it suits O-III-rich nebulae; galaxies and star clusters do not benefit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e SVBONY does not publish a weight for this filter.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. Thread it onto the bottom of a 1.25″ eyepiece or into a diagonal's nosepiece.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill it remove light pollution?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eIt does not remove light pollution, but it increases the contrast between O-III nebulae and the sky.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich telescope works best?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eSVBONY recommends a large-aperture telescope under clear, dark skies with good seeing.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 1.25″ 18 nm O-III filter with 90% line transmission and 400–700 nm blocking, for higher-contrast views of planetary and emission nebulae.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"Default Title","offer_id":67722237182063,"sku":"F9186A","price":65.54,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/1_20250806114205_1998_20260810140508_1030.webp?v=1791670161"},{"product_id":"svbony-sv115-2-oiii-18nm-filter","title":"SVBONY SV115 2″ OIII 18nm Narrowband Filter","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/svbony-oiii-2inch_20250806104729_2751_20260820171152_4634.webp?v=1791670173\" alt=\"SVBONY SV115 2″ OIII 18nm filter\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe SVBONY SV115 2″ (item F9186B) is an O-III narrowband filter with an 18 ± 2 nm passband centred near 500 nm. It transmits 90% at 495.9 nm and 500.7 nm and blocks across 400–700 nm, cutting light from mercury and sodium street lamps and natural skyglow. The 1.85 mm glass carries dichroic and anti-reflection coatings to reduce glare and ghosting, in a standard 2″ cell that fits all 2″ eyepieces.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you observe through a 2″ focuser or diagonal and want higher-contrast views of emission nebulae, planetary nebulae and supernova remnants, including bright nebulae like M42 under heavy light pollution.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/svbony-oiii-2inch_20250806104748_7972.jpg?v=1791670174\" alt=\"SVBONY SV115 2″ OIII filter\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e18 ± 2 nm FWHM\u003c\/strong\u003e around the O-III lines.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e90% transmission\u003c\/strong\u003e at 495.9 nm and 500.7 nm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e400–700 nm blocking\u003c\/strong\u003e against artificial light and skyglow.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDichroic and anti-reflection coatings:\u003c\/strong\u003e reduce glare and ghost images.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e2″ cell, 1.85 mm glass.\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/svbony-oiii-2inch-11_20250806104820_2026.jpg?v=1791670174\" alt=\"SVBONY SV115 2″ OIII filter coatings\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eOptical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe filter passes a narrow band around the doubly-ionized oxygen emission that nebulae radiate strongly, and blocks most of the visible spectrum where light pollution and skyglow fall. The sky background darkens far more than the nebula, so faint structure becomes visible. It raises contrast rather than brightness, and SVBONY notes the best results come with large apertures under clear, dark skies with good seeing.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupernova remnants\u003c\/strong\u003e such as the Veil.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlanetary nebulae\u003c\/strong\u003e and \u003cstrong\u003eemission nebulae\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM42 and other bright nebulae\u003c\/strong\u003e from light-polluted sites.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/svbony-oiii-2inch-1_20250806104822_6308.jpg?v=1791670174\" alt=\"SVBONY SV115 2″ OIII filter cell\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 2″, fits all 2″ eyepieces and 2″ diagonals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.25″ version:\u003c\/strong\u003e SVBONY also makes the SV115 in 1.25″ as a separate product.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6373000045712565875536384_20250806104827_4956.jpg?v=1791670174\" alt=\"SVBONY SV115 2″ OIII filter graphic\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eContrast, not brightness:\u003c\/strong\u003e the filter does not remove light pollution or brighten objects; it darkens the background so O-III nebulae stand out.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTarget-specific:\u003c\/strong\u003e galaxies and star clusters do not benefit from an O-III filter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e SVBONY does not publish a weight for this filter.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. Thread it onto a 2″ eyepiece barrel or into a 2″ diagonal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it work in the city?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eIt increases nebula contrast under light pollution, and SVBONY lists bright nebulae such as M42 as targets even under heavy light pollution.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich objects benefit most?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eEmission nebulae, planetary nebulae and supernova remnants.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 2″ 18 nm O-III filter with 90% line transmission and 400–700 nm blocking, for higher-contrast visual views of nebulae and supernova remnants.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"Default Title","offer_id":67722240327791,"sku":"F9186B","price":79.79,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/svbony-oiii-2inch_20250806104729_2751_20260820171152_4634.webp?v=1791670173"},{"product_id":"svbony-sv132-1-25-h-beta-filter","title":"SVBONY SV132 1.25″ H-Beta 25nm Nebula Filter","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6372991326672431911273645.jpg?v=1791669868\" alt=\"SVBONY SV132 1.25 inch H-Beta 25nm filter key visual\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe SVBONY SV132 1.25″ (item W9102A) is an H-Beta narrowband filter for visual observing. It transmits 80% at 486 nm — the hydrogen-beta emission line — with a 25 ± 3 nm bandwidth, and holds mercury (435 nm, 578 nm) and sodium (589 nm) lines to 0.1% transmission. The 1.85 mm glass is double-side polished to 1\/4-wave accuracy and coated in a planetary-rotation chamber for an even coating, mounted in a metal cell with the standard M28.5 × 0.6 1.25″ thread.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6_20250806105406_8434_20260820155431_1753.webp?v=1791670290\" alt=\"SVBONY SV132 1.25 inch H-Beta 25nm filter for visual nebula observing\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you observe faint emission nebulae visually through a moderate- to large-aperture telescope with 1.25″ eyepieces, and want the H-beta-bright objects — the Horsehead and California nebulae above all — to separate from the sky background.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e486 nm H-beta passband:\u003c\/strong\u003e 25 ± 3 nm FWHM with 80% transmission at the line.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLight-pollution rejection:\u003c\/strong\u003e 0.1% transmission at the Hg 435\/578 nm and Na 589 nm lines.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDouble-side polished, 1\/4 wave:\u003c\/strong\u003e with tight parallelism, which SVBONY credits with halo-free views around bright stars.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUniform vacuum-deposited coating:\u003c\/strong\u003e applied with a planetary rotation system.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMetal cell, M28.5 × 0.6:\u003c\/strong\u003e fits 1.25″ eyepieces and threaded diagonal barrels.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/1_20250806105707_5061.jpg?v=1791670290\" alt=\"SVBONY SV132 1.25 inch H-Beta filter for Horsehead Nebula viewing\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Horsehead Nebula (B33)\u003c\/strong\u003e against IC 434.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eThe California Nebula (NGC 1499).\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOther emission nebulae:\u003c\/strong\u003e SVBONY also lists M42, planetary nebulae and supernova remnants among suitable targets.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/2_20250806105707_3608.jpg?v=1791670290\" alt=\"SVBONY SV132 1.25 inch H-Beta filter coated glass\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread:\u003c\/strong\u003e M28.5 × 0.6, for 1.25″ eyepieces and threaded 1.25″ diagonal barrels.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTelescope:\u003c\/strong\u003e SVBONY recommends moderate to large apertures and dark skies for the faintest targets.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2″ version:\u003c\/strong\u003e SVBONY also makes the SV132 in 2″.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/3_20250806105707_4351.jpg?v=1791670290\" alt=\"SVBONY SV132 1.25 inch H-Beta filter metal cell\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecialist filter:\u003c\/strong\u003e H-beta enhances a relatively short list of objects; an OIII or UHC-type filter covers more nebulae.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAperture and sky:\u003c\/strong\u003e the faint H-beta targets reward larger apertures and dark sites.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e not published by SVBONY.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. Thread it onto the bottom of a 1.25″ eyepiece or into a threaded diagonal barrel.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat will an H-Beta filter show me?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eMainly nebulae that are bright in hydrogen-beta, with the Horsehead and California nebulae the best-known examples.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it block light pollution?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eIt holds the main mercury and sodium lines to 0.1%, though the faintest H-beta targets still look best from dark skies.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill it fit my eyepieces?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eIt fits any 1.25″ eyepiece with the standard M28.5 × 0.6 filter thread.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 1.25″, 25 nm H-Beta filter passing 80% at 486 nm and blocking Hg and Na lines to 0.1%, made for bringing out the Horsehead, California and other H-beta nebulae.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"Default Title","offer_id":67722264510575,"sku":"W9102A","price":67.25,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6_20250806105406_8434_20260820155431_1753.webp?v=1791670290"},{"product_id":"svbony-sv227-1-25-sho-5nm-filter-set","title":"SVBONY SV227 1.25″ SHO 5nm Narrowband Filter Set (H-alpha, OIII, SII)","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9187a-0_20251231163447_0084.webp?v=1791670370\" alt=\"SVBONY SV227 1.25 inch SHO 5nm filter set\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe SVBONY SV227 1.25″ SHO set is three 5 nm narrowband imaging filters, H-alpha at 656.3 nm, OIII at 500.7 nm and SII at 671.6 nm, for building Hubble-palette and bicolour images of emission nebulae. Each filter has a peak transmission of at least 90%, average blocking of OD5 across 300–1000 nm and a 26 mm clear aperture, in a thin 6061T aluminium cell with an M28.5 x 0.6 thread. The set weighs 140 g, and each filter 15 g.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9187a-2_20250908141530_1031.jpg?v=1791670371\" alt=\"SVBONY SV227 1.25 inch H-alpha, OIII and SII filters\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you image emission nebulae with a monochrome camera and a 1.25″ filter wheel or drawer, especially from light-polluted skies where narrowband isolates the target lines from sky glow.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eComplete SHO set:\u003c\/strong\u003e H-alpha, OIII and SII in matching 5 nm bandwidths.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e≥90% peak transmission:\u003c\/strong\u003e at each emission line.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOD5 average cut-off depth:\u003c\/strong\u003e strong rejection of unwanted light from 300 to 1000 nm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDouble-sided polishing and coating:\u003c\/strong\u003e single-piece substrates, not two-piece cemented, with 1\/4λ surface flatness and 30″ parallelism.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e26 mm clear aperture:\u003c\/strong\u003e in a thin metal cell to maximise the opening.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9187a-3_20250908141531_9869.jpg?v=1791670370\" alt=\"SVBONY SV227 1.25 inch SHO filter cells and coatings\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eOptical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eEach filter is an interference filter on a 1.85 mm substrate. Narrowing the passband to 5 nm around the target line raises the contrast of faint nebulosity against the background, and the OD5 blocking keeps light pollution and moonlight out of the frame. Surface quality is 60\/40, with 1\/4λ surface parallelism.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9187a-5_20250908141536_3539.jpg?v=1791670370\" alt=\"SVBONY SV227 1.25 inch SHO filter optical detail\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSHO (Hubble palette) imaging\u003c\/strong\u003e of emission nebulae and supernova remnants.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHOO bicolour imaging\u003c\/strong\u003e with the H-alpha and OIII filters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImaging under city skies\u003c\/strong\u003e and around the Moon.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread:\u003c\/strong\u003e M28.5 x 0.6 male, single thread, standard 1.25″ size (Φ31.75 x 7 mm cell).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilter holders:\u003c\/strong\u003e any 1.25″ filter wheel, drawer slider or camera nosepiece with the standard thread.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSensor size:\u003c\/strong\u003e 1.25″ filters suit small and medium sensors; larger sensors are usually paired with 2″ filters.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9187a-6_20250908141539_1310.jpg?v=1791670370\" alt=\"SVBONY SV227 1.25 inch SHO filter thread and fit\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWhat's in the Box\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e1.25″ H-alpha filter x1\u003c\/li\u003e\n\u003cli\u003e1.25″ SII filter x1\u003c\/li\u003e\n\u003cli\u003e1.25″ OIII filter x1\u003c\/li\u003e\n\u003cli\u003ePP storage cases x3\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9187a-7_20250908141541_0329.jpg?v=1791670370\" alt=\"SVBONY SV227 1.25 inch SHO filter set with storage cases\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eImaging filters:\u003c\/strong\u003e designed for camera imaging, with mono cameras getting the most from each line.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eNot for solar use.\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWheel or drawer:\u003c\/strong\u003e a filter wheel or drawer makes changing between the three filters straightforward.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. Each filter threads into a standard 1.25″ filter wheel position, drawer slider or camera nosepiece.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use them with a colour camera?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThey work, but a colour sensor records each line on only part of its pixels; a mono camera uses the full sensor for each filter.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat bandwidth are they?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e5 nm for all three filters.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a matched set of 1.25″ 5 nm H-alpha, OIII and SII filters with ≥90% peak transmission and OD5 blocking, for narrowband nebula imaging.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"Default Title","offer_id":67722281779311,"sku":"W9187A","price":239.39,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9187a-0_20251231163447_0084.webp?v=1791670370"},{"product_id":"svbony-sv227-2-sii-5nm-filter","title":"SVBONY SV227 2″ SII 5nm Narrowband Filter","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385397542214813458448612.jpg?v=1791670054\" alt=\"SVBONY SV227 2 inch SII 5nm filter key visual\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe SVBONY SV227 SII is a 2″ narrowband imaging filter with a 5 nm passband centred on the 672 nm sulfur II emission line. Peak transmission is at least 90%, blocking is ≥OD5 across 300–1000 nm, and the clear aperture is 44 mm. The 1.85 mm substrate sits in a CNC-machined, black-anodised cell with an M48 x 0.75 thread, and SVBONY lists the net weight as 12.5 g.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385397542271866472935008.jpg?v=1791670054\" alt=\"SVBONY SV227 SII 5nm filter feature panel\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you image emission nebulae with a monochrome camera and are building SHO (Hubble palette) data, using a 2″ filter wheel or drawer to cover a larger sensor.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e5 nm at 672 nm:\u003c\/strong\u003e isolates sulfur II emission from light pollution and moonlight.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e≥90% peak transmission\u003c\/strong\u003e and \u003cstrong\u003e≥OD5 blocking\u003c\/strong\u003e from 300 to 1000 nm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoatings:\u003c\/strong\u003e multi-layer anti-reflection coatings applied by electron-beam evaporation with ion-assisted deposition.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptical glass:\u003c\/strong\u003e SVBONY specifies German optical glass, 60\/40 surface quality, 1\/4λ surface parallelism and 30″ parallelism.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMetal cell:\u003c\/strong\u003e CNC-machined, black-anodised and laser-engraved.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385397542306319549485514.jpg?v=1791670054\" alt=\"SVBONY SV227 SII 5nm filter narrowband passband panel\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385397542344500281061317.jpg?v=1791670054\" alt=\"SVBONY SV227 SII 5nm filter coating panel\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385397542378800322229235.jpg?v=1791670054\" alt=\"SVBONY SV227 SII 5nm filter cell construction panel\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eOptical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eSII is usually the faintest of the three SHO lines, so a narrow 5 nm passband and deep blocking are what keep the background dark enough to record it. The interference coating passes the 672 nm line at ≥90% while rejecting the rest of the 300–1000 nm range at ≥OD5, which also blocks the near infrared that a separate IR-cut filter would otherwise handle.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385397542436005566693443.jpg?v=1791670054\" alt=\"SVBONY SV227 SII 5nm filter design panel\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385397542528187257188455.jpg?v=1791670055\" alt=\"SVBONY SV227 SII 5nm filter specification panel\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSHO imaging\u003c\/strong\u003e of emission nebulae and supernova remnants alongside H-alpha and OIII.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImaging from light-polluted skies\u003c\/strong\u003e or with the Moon up.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread:\u003c\/strong\u003e M48 x 0.75, single thread, standard 2″ size.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHolders:\u003c\/strong\u003e 2″ filter wheels, filter drawer sliders and 2″ nosepieces.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMatching filters:\u003c\/strong\u003e SVBONY makes the SV227 2″ H-alpha and OIII 5 nm filters and a 2″ SHO set.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385397542585268411438632.jpg?v=1791670054\" alt=\"SVBONY SV227 SII 5nm filter compatibility panel\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385397542614922596939829.jpg?v=1791670054\" alt=\"SVBONY SV227 SII 5nm filter detail panel\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFocal ratio:\u003c\/strong\u003e SVBONY lists it as unsuitable for telescopes faster than f\/4.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eNot for solar use.\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThis listing is the filter only;\u003c\/strong\u003e SVBONY also offers it with a 2″ holder.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. It threads into a 2″ filter wheel position, drawer slider or nosepiece like any standard M48 filter.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use it on an f\/3.6 astrograph?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eSVBONY rates it for f\/4 and slower.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo I still need an IR-cut filter?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. The ≥OD5 blocking covers the near infrared.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 2″, 5 nm SII filter at 672 nm with ≥90% peak transmission and ≥OD5 blocking, for SHO imaging at f\/4 and slower.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"SII Filter","offer_id":67722288726127,"sku":"W9187DA","price":133.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9187da-0_20251231163326_4185.webp?v=1791670410"},{"product_id":"svbony-sv227-2-h-alpha-5nm-filter","title":"SVBONY SV227 2″ H-Alpha 5nm Narrowband Filter","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385397605919067707591016.jpg?v=1791670054\" alt=\"SVBONY SV227 2 inch H-alpha 5nm filter key visual\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe SVBONY SV227 H-alpha is a 2″ narrowband imaging filter with a 5 nm passband centred on the 656.3 nm hydrogen-alpha line. Peak transmission is at least 90%, blocking is ≥OD5 across 300–1000 nm, and the clear aperture is 44 mm. The 1.85 mm substrate sits in a thin CNC-machined, black-anodised aluminium cell with an M48 x 0.75 thread, and SVBONY lists the net weight as 12.5 g.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385397605975736149633031.jpg?v=1791670054\" alt=\"SVBONY SV227 H-alpha 5nm filter feature panel\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you image emission nebulae with a monochrome camera, whether for H-alpha luminance, HOO bicolour or full SHO, and use a 2″ filter wheel or drawer to cover a larger sensor.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e5 nm at 656.3 nm:\u003c\/strong\u003e isolates hydrogen-alpha emission from sodium and mercury-vapour light pollution.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e≥90% peak transmission\u003c\/strong\u003e and \u003cstrong\u003e≥OD5 blocking\u003c\/strong\u003e from 300 to 1000 nm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMulti-layer anti-reflection coatings\u003c\/strong\u003e on German optical glass.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThin aluminium cell:\u003c\/strong\u003e maximises clear aperture; CNC-machined, black-anodised and laser-engraved.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSurface quality 60\/40,\u003c\/strong\u003e 1\/4λ surface parallelism and 30″ parallelism.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385397606005497049327774.jpg?v=1791670055\" alt=\"SVBONY SV227 H-alpha 5nm filter narrowband passband panel\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385397606062209781692397.jpg?v=1791670055\" alt=\"SVBONY SV227 H-alpha 5nm filter coating panel\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6386052953626902506599897.jpg?v=1791670055\" alt=\"SVBONY SV227 H-alpha 5nm filter design panel\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eOptical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eH-alpha is the brightest line in most emission nebulae, and a 5 nm passband records it with a very dark background even under city skies. The interference coating passes 656.3 nm at ≥90% and rejects the rest of the 300–1000 nm range at ≥OD5, so no separate IR-cut filter is needed.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385397606149293813656958.jpg?v=1791670054\" alt=\"SVBONY SV227 H-alpha 5nm filter cell construction panel\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385397606178884833021087.jpg?v=1791670055\" alt=\"SVBONY SV227 H-alpha 5nm filter specification panel\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eH-alpha imaging\u003c\/strong\u003e of emission nebulae, on its own or as luminance for colour data.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHOO and SHO imaging\u003c\/strong\u003e alongside OIII and SII filters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImaging from light-polluted skies\u003c\/strong\u003e or with the Moon up.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread:\u003c\/strong\u003e M48 x 0.75, single thread, standard 2″ size.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHolders:\u003c\/strong\u003e 2″ filter wheels, filter drawer sliders and 2″ nosepieces.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMatching filters:\u003c\/strong\u003e SVBONY makes the SV227 2″ OIII and SII 5 nm filters and a 2″ SHO set.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385397606292906252503802.jpg?v=1791670055\" alt=\"SVBONY SV227 H-alpha 5nm filter compatibility panel\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFocal ratio:\u003c\/strong\u003e SVBONY lists it as unsuitable for telescopes faster than f\/4.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot for solar use:\u003c\/strong\u003e this is a night-sky imaging filter, not a solar H-alpha filter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThis listing is the filter only;\u003c\/strong\u003e SVBONY also offers it with a 2″ holder.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. It threads into a 2″ filter wheel position, drawer slider or nosepiece like any standard M48 filter.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I look at the Sun with it?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. It is a deep-sky imaging filter; solar H-alpha viewing needs a dedicated solar telescope or filter system.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill it work with a colour camera?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes, though a colour sensor records H-alpha on its red pixels only; a mono camera uses every pixel.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 2″, 5 nm H-alpha filter at 656.3 nm with ≥90% peak transmission and ≥OD5 blocking, for nebula imaging at f\/4 and slower.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"H-Alpha Filter","offer_id":67722299113583,"sku":"W9187DB","price":133.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9187db-1_20250908144153_3780_20260810152133_0115.webp?v=1791670449"},{"product_id":"svbony-sv227-2-oiii-5nm-filter","title":"SVBONY SV227 2″ OIII 5nm Narrowband Filter","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385397656908010027322728.jpg?v=1791670055\" alt=\"SVBONY SV227 2 inch OIII 5nm filter key visual\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe SVBONY SV227 OIII is a 2″ narrowband imaging filter with a 5 nm passband centred on the 500.7 nm doubly ionised oxygen line. Peak transmission is at least 90%, blocking is ≥OD5 across 300–1000 nm, and SVBONY's spec table gives a 44 mm clear aperture. The 1.85 mm substrate sits in a CNC-machined, sand-blasted, black-anodised cell with an M48 x 0.75 thread, and SVBONY lists the net weight as 12.5 g.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385397656964388004370122.jpg?v=1791670055\" alt=\"SVBONY SV227 OIII 5nm filter feature panel\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you image planetary nebulae, supernova remnants and emission nebulae with a monochrome camera, for HOO bicolour or full SHO, from a 2″ filter wheel or drawer.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e5 nm at 500.7 nm:\u003c\/strong\u003e isolates OIII emission and raises target-to-sky contrast under urban skies.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e≥90% peak transmission\u003c\/strong\u003e and \u003cstrong\u003e≥OD5 blocking\u003c\/strong\u003e from 300 to 1000 nm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInfrared blocked:\u003c\/strong\u003e roughly 700–1100 nm is rejected, so no separate IR-cut filter is needed.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIon-assisted multi-coating\u003c\/strong\u003e on German glass for scratch resistance and wavelength stability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMetal cell:\u003c\/strong\u003e CNC-machined, sand-blasted, black-anodised and laser-engraved.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385397656994019817804039.jpg?v=1791670055\" alt=\"SVBONY SV227 OIII 5nm filter narrowband passband panel\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385397657031471537927564.jpg?v=1791670055\" alt=\"SVBONY SV227 OIII 5nm filter coating panel\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eOptical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eOIII emission sits close to the brightest part of the light-pollution spectrum, which is why a narrow passband matters most here. At 5 nm, with ≥OD5 rejection elsewhere, the filter records the 500.7 nm line with a dark background, and the deep blocking also removes the near infrared. Surface quality is 60\/40, with 1\/4λ surface parallelism and 30″ parallelism.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385397657083559644945563.jpg?v=1791670055\" alt=\"SVBONY SV227 OIII 5nm filter cell construction panel\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385397657142521238069515.jpg?v=1791670055\" alt=\"SVBONY SV227 OIII 5nm filter specification panel\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOIII imaging\u003c\/strong\u003e of planetary nebulae and supernova remnants.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHOO and SHO imaging\u003c\/strong\u003e alongside H-alpha and SII filters.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eDeep-sky imaging from light-polluted urban areas.\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread:\u003c\/strong\u003e M48 x 0.75, single thread, standard 2″ size.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHolders:\u003c\/strong\u003e 2″ filter wheels, filter drawer sliders and 2″ nosepieces.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMatching filters:\u003c\/strong\u003e SVBONY makes the SV227 2″ H-alpha and SII 5 nm filters and a 2″ SHO set.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385397657172163324801402.jpg?v=1791670055\" alt=\"SVBONY SV227 OIII 5nm filter compatibility panel\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFocal ratio:\u003c\/strong\u003e SVBONY lists it as unsuitable for telescopes faster than f\/4.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eNot for solar use.\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThis listing is the filter only;\u003c\/strong\u003e SVBONY also offers it with a 2″ holder.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. It threads into a 2″ filter wheel position, drawer slider or nosepiece like any standard M48 filter.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs it a visual OIII filter?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eIt is designed as an imaging filter; its 5 nm passband is narrower than typical visual OIII filters.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo I need an IR-cut filter as well?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. The filter blocks the near infrared on its own.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 2″, 5 nm OIII filter at 500.7 nm with ≥90% peak transmission and ≥OD5 blocking, for nebula imaging at f\/4 and slower.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"OIII Filter","offer_id":67722307403887,"sku":"W9187DC","price":133.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/W9187DC-1_20251206142152_7716_20260810145223_4262.webp?v=1791670487"}],"url":"https:\/\/ontariotelescope.com\/collections\/narrowband-svbony.oembed","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}