{"title":"SVBONY Dual-Band Filters","description":"\u003cp\u003eThe SVBONY SV220 comes in 7nm and 3nm H-alpha + OIII versions and a 7nm SII + OIII version, covering both bicolour and Hubble-palette work with a colour camera. The SV240 passes H-alpha, OIII and H-beta plus near-infrared for a broader multi-band option, in 1.25\" and 2\". Part of \u003ca href=\"\/collections\/dual-band\"\u003eDual-Band \u0026amp; Multi-Band Filters\u003c\/a\u003e.\u003c\/p\u003e","products":[{"product_id":"svbony-sv220-2-7nm-h-alpha-oiii-dual-band-filter","title":"SVBONY SV220 2″ 7nm H-Alpha \u0026 OIII Dual-Band Filter","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6381369372334549875781772.jpg?v=1791667852\" alt=\"SVBONY SV220 7nm H-alpha and OIII dual-band 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 SV220 is a 2″ dual-band narrowband filter with two 7 nm passbands, one centred on OIII at 500.7 nm and one on H-alpha at 656.3 nm. SVBONY rates peak transmission above 90% at OIII and above 94% at H-alpha, with OD5 blocking across a 300–1100 nm working range. The filter is built on a 1.80 mm substrate with a 44 mm clear aperture, 60\/40 surface quality and 1\/4λ parallelism, mounted in an M48 x 0.75 cell. It weighs 12.5 g.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6381369375177755491276519.jpg?v=1791667852\" alt=\"SVBONY SV220 dual-band filter bringing out deep-sky nebula detail\" 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\/6381369376798699968785762.jpg?v=1791667852\" alt=\"SVBONY SV220 OIII and H-alpha 7nm passbands reducing light pollution\" 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 one-shot-colour camera, especially from a suburban or city backyard, or when the Moon is up. Because both emission lines pass in a single exposure, a colour camera records hydrogen and oxygen detail together without a filter wheel.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387244835527968301332234.jpg?v=1791667852\" alt=\"SVBONY SV220 dual-band filter key features and design\" 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\u003eTwo 7 nm passbands:\u003c\/strong\u003e isolates OIII (500.7 nm) and H-alpha (656.3 nm) emission and rejects most of the spectrum between and around them.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh line transmission:\u003c\/strong\u003e T\u0026gt;90% at OIII and T\u0026gt;94% at H-alpha.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOD5 blocking:\u003c\/strong\u003e suppresses mercury-vapour and sodium-vapour street lighting, airglow from atmospheric neutral oxygen, and general sky glow.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptical quality:\u003c\/strong\u003e 60\/40 surface quality and 1\/4λ surface parallelism on a 1.80 mm substrate.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2″ M48 x 0.75 cell:\u003c\/strong\u003e 44 mm clear aperture for larger sensors and 2″ imaging trains.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6381369380564452768498194.jpg?v=1791667852\" alt=\"SVBONY SV220 dual-band filter OD5 blocking and optical quality\" 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\/6381369382041458956095111.jpg?v=1791667852\" alt=\"SVBONY SV220 nebula imaging from light-polluted city or under a full moon\" 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\/6381369384090793743066059.jpg?v=1791667851\" alt=\"SVBONY SV220 dual-band filter recommended uses for emission nebulae\" 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\u003eEmission nebulae:\u003c\/strong\u003e hydrogen regions such as the North America, Rosette and Heart nebulae.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlanetary nebulae and supernova remnants:\u003c\/strong\u003e targets where OIII and H-alpha structure carry the image.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLight-polluted or moonlit imaging:\u003c\/strong\u003e narrow passbands keep the sky background dark from urban sites.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBicolour (HOO) processing:\u003c\/strong\u003e the two lines can be separated from colour-camera data in processing.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6381369386228837255680093.jpg?v=1791667852\" alt=\"SVBONY SV220 dual-band filter nebula imaging applications\" 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\/6381369387402006221181094.jpg?v=1791667852\" alt=\"SVBONY SV220 2-inch M48 filter compatibility\" 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\/6381369389728950705111721.jpg?v=1791667852\" alt=\"SVBONY SV220 dual-band filter use with colour cameras and imaging trains\" 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 M48 x 0.75, the standard 2″ filter thread, for 2″ filter drawers, filter wheels, camera adapters and 2″ nosepieces with filter threads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCameras:\u003c\/strong\u003e designed as an OSC (one-shot-colour) filter; it also works with mono cameras.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFocal ratio:\u003c\/strong\u003e SVBONY rates it for telescopes at f\/4 and slower.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSHO colour with a colour camera:\u003c\/strong\u003e SVBONY pairs it with the SV220 2″ 7nm SII \u0026amp; OIII filter, which supplies the sulphur data for a Hubble-palette blend.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilter drawers:\u003c\/strong\u003e the SVBONY SV226 filter drawers take 2″ M48 filters for quick swapping without removing the camera.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6381369391629416504375686.jpg?v=1791667852\" alt=\"SVBONY SV220 2-inch filter compatibility and accessory details\" 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\/6381369393049881724054907.jpg?v=1791667852\" alt=\"SVBONY SV220 dual-band filter details to know before ordering\" 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\/6381369394335091831892928.jpg?v=1791667852\" alt=\"SVBONY SV220 dual-band filter construction details\" 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 only:\u003c\/strong\u003e the filter is designed for cameras and has no application for eyepiece viewing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot a solar filter:\u003c\/strong\u003e it provides no protection for observing or imaging the Sun.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFast optics:\u003c\/strong\u003e narrowband passbands shift toward shorter wavelengths in a steep light cone, which can clip the H-alpha line. SVBONY specifies f\/4 or slower, which excludes f\/2 systems such as RASA-type astrographs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e this listing is the 2″ M48 version. SVBONY also makes a 1.25″ SV220 with an M28.5 x 0.6 thread.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSingle thread:\u003c\/strong\u003e the cell is threaded on one side.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6381369395503526377102669.jpg?v=1791667852\" alt=\"SVBONY SV220 dual-band filter cell and thread details\" 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\/6381369396725901629739765.jpg?v=1791667852\" alt=\"SVBONY SV220 dual-band filter performance data\" 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\/6381369398047470475187046.jpg?v=1791667852\" alt=\"SVBONY SV220 dual-band filter specifications\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\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 any M48 x 0.75 filter thread or drops into a 2″ filter drawer slot, and focus is set as usual with the filter in place.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use it with a DSLR or colour astronomy camera?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes. It is designed for one-shot-colour sensors, which record H-alpha in the red channel and OIII in the green and blue channels in a single exposure.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill it work on my f\/2 astrograph?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eSVBONY specifies f\/4 or slower. Below that, band shift can push the H-alpha line outside the passband. If you are unsure where your system sits, send us the telescope and reducer details and we will check it with you.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow does it compare with a broadband light-pollution filter?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eA broadband filter passes several wide windows and suits galaxies and star fields. The SV220's 7 nm passbands pass far less sky glow and suit emission nebulae, at the cost of star colour.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 2″ M48 dual-band filter with 7 nm H-alpha and OIII passbands and OD5 blocking, for colour-camera nebula imaging from bright skies on telescopes at f\/4 and slower.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"Default Title","offer_id":67721425649775,"sku":"W9172B","price":173.85,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/W9172B_20260623173702_8974_20260806133410_4267.webp?v=1791665208"},{"product_id":"svbony-sv240-2-inch-multi-narrowband-filter","title":"SVBONY SV240 2″ Multi-Narrowband Filter (H-alpha, OIII, H-beta + NIR)","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6386027808302692172019645.webp?v=1791670099\" alt=\"SVBONY SV240 2″ multi-narrowband 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 SV240 is a 2″ multi-bandpass filter for deep-sky imaging with colour cameras under light-polluted skies. It passes the H-alpha (656.3 nm), OIII (495.9 and 500.7 nm) and H-beta (486.1 nm) emission lines, adds a near-infrared passband averaging over 95% transmission across 830–870 nm, and blocks the bands where most artificial light sits. It is built on a 2 mm substrate with a 44 mm clear aperture and threads into M48 x 0.75 filter cells, drawers and wheels. Published FWHM figures are 24 nm, 20 nm and 115 nm, and the filter weighs 12.5 g.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385968203442444802777696.jpg?v=1791670100\" alt=\"SVBONY SV240 2″ multi-narrowband filter cut-off depth and FWHM bands\" 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 with a one-shot-colour camera from a city or suburban site and want one filter that handles emission nebulae as well as broader targets such as galaxies, reflection nebulae and star clusters, without moving to a monochrome camera and filter set. It also suits imagers whose camera has strong near-infrared sensitivity, such as models built on the Sony IMX585 or IMX464.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMulti-band passband:\u003c\/strong\u003e H-alpha, OIII and H-beta in the visible plus a near-infrared window, for colour imaging in a single exposure set.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDeep blocking:\u003c\/strong\u003e \u0026gt;OD5 at 300–450 nm, \u0026gt;OD4 at 560–620 nm, \u0026gt;OD2 at 690–750 nm and \u0026gt;OD3 at 940–1100 nm. SVBONY rates it for skies up to Bortle 8.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh line transmission:\u003c\/strong\u003e \u0026gt;95% at 486.1 nm, \u0026gt;92% at 495.9 nm, \u0026gt;85% at 500.7 nm and \u0026gt;95% at 656.3 nm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide working range:\u003c\/strong\u003e controlled from 300 to 1100 nm, so stray infrared beyond the NIR window is blocked.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2″ format, M48 x 0.75 thread:\u003c\/strong\u003e single thread, 44 mm clear aperture, 2 mm substrate.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptical quality:\u003c\/strong\u003e 60\/40 surface quality and 1\/4λ surface parallelism.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6386276676838615805303664.jpg?v=1791670100\" alt=\"SVBONY SV240 2″ multi-narrowband filter Bortle 8 light pollution resistance\" 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\/6386276679504517748605846.jpg?v=1791670100\" alt=\"SVBONY SV240 2″ multi-narrowband filter 300–1100 nm wavelength range\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eOptical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe SV240 uses a multilayer interference coating to open narrow windows at the main nebular emission lines while rejecting the sodium and mercury bands typical of urban lighting. Compared with a dual-band H-alpha\/OIII filter, the added H-beta line and the near-infrared window let more continuum light from stars and galaxies through, which keeps colour balance more natural and makes broadband targets workable. Modern sensors with high near-infrared quantum efficiency gain signal in that window, where artificial light pollution is weaker, improving signal-to-noise and contrast.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385968203654164189139366.jpg?v=1791670100\" alt=\"SVBONY SV240 2″ multi-narrowband filter average transmittance chart\" 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\u003eEmission nebulae and supernova remnants\u003c\/strong\u003e from light-polluted skies with a colour camera.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGalaxies, reflection nebulae and star clusters,\u003c\/strong\u003e where a dual-band filter would cut too much continuum light.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOne filter across several rigs:\u003c\/strong\u003e the same filter serves different telescope and camera combinations that use 2″ filters.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385968203686798427980963.jpg?v=1791670100\" alt=\"SVBONY SV240 2″ multi-narrowband filter target types panel\" 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 M48 x 0.75, for 2″ filter drawers, filter wheels, nosepieces and flattener or reducer filter threads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCameras:\u003c\/strong\u003e SVBONY recommends NIR-enhanced colour sensors such as the IMX585 and IMX464, and notes that cameras with an AR-coated protective window suit the filter best. A camera with a built-in UV\/IR cut window blocks the NIR passband.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTelescopes:\u003c\/strong\u003e SVBONY recommends a reflector or APO refractor, because near-infrared light can show halos around bright stars in optics not corrected that far into the infrared.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSVBONY options:\u003c\/strong\u003e SVBONY also lists the SV240 paired with an SV226 filter drawer and with an SV220 7 nm H-alpha\/OIII filter.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6386276692589590589772518.jpg?v=1791670100\" alt=\"SVBONY SV240 2″ multi-narrowband filter near-infrared 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\/6385968203778155462642223.jpg?v=1791670100\" alt=\"SVBONY SV240 2″ multi-narrowband filter urban imaging 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\/6387244826710371677730187_022c9a48-4004-46e0-be04-604f62b8e7d6.jpg?v=1791670100\" alt=\"SVBONY SV240 2″ multi-narrowband filter parameter comparison with SV220\" 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 filter:\u003c\/strong\u003e it is designed for cameras and has no application in visual observing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot a solar filter:\u003c\/strong\u003e it is not designed for imaging or viewing the Sun.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNear-infrared halos:\u003c\/strong\u003e with refractors not corrected into the NIR, bright stars can show halos; reflectors and APO refractors avoid this.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThis listing is the filter only.\u003c\/strong\u003e The SV226 drawer and SV220 combinations SVBONY offers are separate.\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 any M48 x 0.75 filter holder, drawer or wheel position in front of the camera, and focus is set as usual through your capture software.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow does it differ from the SV220?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe SV220 is a dual narrowband filter aimed at emission nebulae, planetary nebulae and supernova remnants. The SV240 adds H-beta and a near-infrared window, so it also works on galaxies, reflection nebulae and star clusters.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich cameras suit it?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eColour cameras with good near-infrared sensitivity, such as IMX585- and IMX464-based models, with an AR-coated rather than UV\/IR-cut protective window.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan it be used on broadband targets?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes. SVBONY describes it as combining the behaviour of the SV220 and a UHC filter, so it performs on both narrowband and broadband targets.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use it for visual observing?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. It is an imaging filter and is not suited to visual use or to solar observing.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 2″ M48 multi-bandpass filter that passes H-alpha, OIII, H-beta and a near-infrared window for colour-camera deep-sky imaging from city skies, best paired with a reflector or APO refractor and an NIR-sensitive sensor.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"SV240","offer_id":67722259464303,"sku":"W9191A","price":170.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9191a-1_20250806120121_1958_20260806134447_3511.webp?v=1791670266"},{"product_id":"svbony-sv220-1-25-7nm-h-alpha-oiii-dual-band-filter","title":"SVBONY SV220 1.25″ 7nm H-Alpha \u0026 OIII Dual-Band Filter","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6383229366022653233256396.jpg?v=1791669934\" alt=\"SVBONY SV220 1.25 inch 7nm H-alpha and OIII dual-band nebula 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 SV220 1.25″ is a dual-band nebula filter that passes two 7 nm-wide bands centred on OIII (500.7 nm) and H-alpha (656.3 nm) and blocks the rest of the 300–1100 nm range to better than OD5. Peak transmission is above 90% at 500.7 nm and above 94% at 656.3 nm. The 1.85 mm substrate sits in a 1.25″ cell with a 26 mm clear aperture and a single M28.5 x 0.6 male thread, and the filter weighs 7 g.\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 one-shot colour camera and want narrowband-style contrast without moving to a monochrome camera and filter wheel, particularly from a light-polluted backyard or under a bright Moon.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387056599689075354202720.jpg?v=1791669934\" alt=\"SVBONY SV220 7nm dual-band filter for one-shot colour cameras\" 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\u003eTwo 7 nm passbands:\u003c\/strong\u003e OIII at 500.7 nm and H-alpha at 656.3 nm, the two strongest emission lines in most nebulae.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOD5 out-of-band blocking:\u003c\/strong\u003e suppresses sodium and mercury street-light lines and sky glow.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh transmission:\u003c\/strong\u003e above 90% (OIII) and above 94% (H-alpha) at peak.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptical quality:\u003c\/strong\u003e 60\/40 surface quality and 1\/4λ surface parallelism.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard 1.25″ cell:\u003c\/strong\u003e M28.5 x 0.6 thread for 1.25″ nosepieces, filter wheels and drawers.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387089761778992623065617.jpg?v=1791669934\" alt=\"SVBONY SV220 7nm dual-band filter light pollution suppression\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eOptical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eA dual-band filter is an interference coating with two narrow transmission windows. By passing only the OIII and H-alpha lines, it lets the nebula's own emission through while rejecting the broadband glow of artificial light and moonlight, which darkens the background and raises contrast. It does not add brightness to the target; it removes what competes with it. On a colour sensor the H-alpha signal lands in the red pixels and OIII in the green and blue pixels, giving a bicolour result in a single exposure. SVBONY notes that the OIII passband is relatively wide for its class, which favours signal collection in that channel.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387056657250575711229458.jpg?v=1791669934\" alt=\"SVBONY SV220 7nm H-alpha and OIII passband transmission\" 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\u003eEmission nebulae:\u003c\/strong\u003e H II regions such as the North America, Rosette and Heart nebulae.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlanetary nebulae and supernova remnants:\u003c\/strong\u003e strong OIII targets such as the Veil.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUrban and moonlit imaging:\u003c\/strong\u003e extends usable nights for colour-camera imagers.\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\u003eCameras:\u003c\/strong\u003e designed for one-shot colour (OSC) astronomy cameras; it also works with mono cameras as a combined Ha+OIII filter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting:\u003c\/strong\u003e threads into any 1.25″ nosepiece, filter wheel or filter drawer with an M28.5 x 0.6 thread.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSensor size:\u003c\/strong\u003e the 26 mm clear aperture suits 1.25″-class sensors; larger sensors are better served by the 2″ SV220.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompanion filter:\u003c\/strong\u003e SVBONY pairs it with the SV220 7nm SII \u0026amp; OIII filter for Hubble-palette (SHO) colour from an OSC camera.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6383229366295169827739688.jpg?v=1791669934\" alt=\"SVBONY SV220 1.25 inch dual-band filter detail 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\/6383229366353398772517711.jpg?v=1791669934\" alt=\"SVBONY SV220 1.25 inch dual-band filter M28.5 thread and cell\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003eIf you are not sure whether a 1.25″ or 2″ filter suits your sensor and telescope, send us your camera model and we will work it out with you.\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 filter:\u003c\/strong\u003e it has no application in visual observing and is not a solar filter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEmission targets:\u003c\/strong\u003e galaxies, reflection nebulae and star clusters are broadband targets and gain little from it.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight figure:\u003c\/strong\u003e SVBONY's spec table lists 7 g; a feature note on the same page lists 5.4 g.\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 a 1.25″ camera nosepiece or into a filter wheel or drawer like any 1.25″ filter.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it work with a colour camera?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes. It is designed for one-shot colour cameras.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill it help in the city?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes. The OD5 blocking suppresses street-light emission and sky glow, which is where dual-band filters do their most useful work.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use it for visual observing?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eIt is an imaging filter and is not intended for visual use.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 1.25″ 7 nm H-alpha and OIII dual-band filter with OD5 blocking that gives colour-camera imagers high-contrast emission-nebula data from light-polluted skies.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"SV220 1.25″","offer_id":67722262773871,"sku":"W9172A","price":106.88,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9172a-1_20250807133600_8978_20260810144122_5751.webp?v=1791670283"},{"product_id":"svbony-sv240-1-25-inch-multi-narrowband-filter","title":"SVBONY SV240 1.25″ Multi-Narrowband Filter (H-alpha, OIII, H-beta + NIR)","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6388825952242082572267611.jpg?v=1791670100\" alt=\"SVBONY SV240 1.25″ multi-narrowband 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 SV240 1.25″ is the smaller-format version of SVBONY's multi-bandpass filter for colour-camera deep-sky imaging under light pollution. It passes H-beta (486.1 nm), OIII (495.9 and 500.7 nm) and H-alpha (656.3 nm), adds a near-infrared window averaging over 98.2% transmission across 830–870 nm, and blocks 300–450 nm, 560–620 nm, 690–750 nm and 940–1100 nm. The coating sits on a 2.0 mm Corning EAGLE substrate with a 26 mm clear aperture, in a CNC-machined, blackened 6061-T aluminium cell with an M28.5 x 0.6 male thread. It weighs 5.4 g.\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 with a one-shot-colour camera that takes 1.25″ filters — a small-sensor planetary or guide-size camera, or a 1.25″ filter wheel or drawer — and want nebula contrast from a suburban or city site without moving to a monochrome workflow. SVBONY rates it for skies from Bortle 1 to Bortle 8.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMulti-band passband:\u003c\/strong\u003e H-beta, OIII and H-alpha with published FWHM figures of 25 nm, 22 nm and 115 nm, plus a near-infrared window.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh line transmission:\u003c\/strong\u003e T\u0026gt;95% at 486.1 nm, T\u0026gt;92.4% at 495.9 nm, T\u0026gt;88.2% at 500.7 nm and T\u0026gt;97% at 656.3 nm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCut-off depth ≥ OD4\u003c\/strong\u003e across the main light-pollution bands, with 50% transmission points at 482 nm and 783 nm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e300–1100 nm working range:\u003c\/strong\u003e controlled well into the infrared.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCorning EAGLE substrate:\u003c\/strong\u003e 2.0 mm thick, 60\/40 surface quality, λ\/2 parallelism.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMachined cell:\u003c\/strong\u003e 6061-T aluminium, blackened and anodized, Φ31.75 x 7 mm, single M28.5 x 0.6 male thread.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6388825955250856132442155.jpg?v=1791670100\" alt=\"SVBONY SV240 1.25″ multi-narrowband filter 300–1100 nm working wavelength\" 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\/6388825956293506215785514.jpg?v=1791670100\" alt=\"SVBONY SV240 1.25″ multi-narrowband filter passband transmission chart\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eOptical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eA multilayer interference coating opens narrow windows at the three main nebular lines and a broader window in the near infrared, while rejecting the visible bands where streetlights and sky glow are strongest. Recent colour sensors respond well in the near infrared, and that region carries less artificial light, so the NIR window adds usable signal and improves contrast while keeping colour balance manageable in processing.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6388825957187038818563589.jpg?v=1791670100\" alt=\"SVBONY SV240 1.25″ multi-narrowband filter Bortle 1 to 8 light pollution 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\/6388825959702659416554472.jpg?v=1791670100\" alt=\"SVBONY SV240 1.25″ multi-narrowband filter light pollution blocking 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\u003eEmission nebulae and supernova remnants\u003c\/strong\u003e from light-polluted skies with a colour camera.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSmall-sensor deep-sky imaging and EAA\u003c\/strong\u003e with 1.25″ filter trains.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOne filter across several setups\u003c\/strong\u003e that share the 1.25″ filter size.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6388825963218021564057299.jpg?v=1791670100\" alt=\"SVBONY SV240 1.25″ multi-narrowband filter compatibility panel\" 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 x 0.6, the standard 1.25″ filter thread used by eyepiece barrels, camera nosepieces, filter wheels and drawers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCameras:\u003c\/strong\u003e designed for one-shot-colour cameras. A camera with a UV\/IR cut window blocks the near-infrared passband; an AR-coated window keeps it.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSensor size:\u003c\/strong\u003e the 26 mm clear aperture suits smaller sensors; for larger sensors the 2″ SV240 is also available.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6388825964562040884889649.jpg?v=1791670100\" alt=\"SVBONY SV240 1.25″ multi-narrowband filter near-infrared passband panel\" 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 x SV240 1.25″ multi-narrowband filter\u003c\/li\u003e\n\u003cli\u003e1 x PP plastic filter box\u003c\/li\u003e\n\u003cli\u003e1 x Packing box\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\u003eImaging filter:\u003c\/strong\u003e it is designed for cameras and has no application in visual observing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNear-infrared halos:\u003c\/strong\u003e SVBONY notes that filters passing infrared can show halos in the NIR region with optics not corrected that far into the infrared.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eNot a solar filter.\u003c\/strong\u003e\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 the 1.25″ filter thread of a camera nosepiece, filter wheel or drawer, and focus is set as usual in your capture software.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it work with a mono camera?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eIt is designed for one-shot-colour cameras, where all three lines and the NIR window are recorded together in one exposure.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the difference between the 1.25″ and 2″ versions?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eFormat and published figures: the 1.25″ has a 26 mm clear aperture and an M28.5 x 0.6 thread; the 2″ has a 44 mm clear aperture and an M48 x 0.75 thread for larger sensors.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy include near infrared?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eMany recent colour sensors are sensitive there, and it carries less artificial light, so it adds signal and contrast.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 5.4 g, 1.25″ M28.5 multi-bandpass filter that passes H-alpha, OIII, H-beta and a near-infrared window for colour-camera nebula imaging from Bortle 1 to Bortle 8 skies.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"Default Title","offer_id":67722270769263,"sku":"W9191B","price":128.24,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9191b-1_20250806093604_7591_20260814162612_7751.webp?v=1791670325"},{"product_id":"svbony-sv220-1-25-3nm-h-alpha-oiii-dual-narrowband-filter","title":"SVBONY SV220 1.25″ 3nm H-Alpha \u0026 OIII Dual Narrowband Filter","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9198a-1_20250828164203_8293.jpg?v=1791669949\" alt=\"SVBONY SV220 1.25 inch 3nm H-alpha and OIII narrowband 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 SV220 1.25″ 3nm is a dual narrowband filter with two passbands of 3 ±1 nm FWHM centred on OIII (500.7 nm) and H-alpha (656.3 nm). Out-of-band light from 300 to 1050 nm is blocked to an average of OD5. The 2.0 mm substrate has a 26 mm clear aperture, 60\/40 surface quality, transmitted wavefront PV ≤ λ\/4 and 30″ parallelism, and is held in a 6061T aluminium cell (Φ31.75 x 7 mm) with a single M28.5 x 0.6 male thread. Net weight is 7 g.\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 colour or mono camera from a heavily light-polluted site and want tighter passbands than a 7 nm filter for higher contrast and smaller stars.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9198a-2_20250828164216_5982.jpg?v=1791669949\" alt=\"SVBONY SV220 3nm filter narrow bandwidth feature panel\" 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\u003e3 nm passbands:\u003c\/strong\u003e isolate the OIII and H-alpha lines more tightly than 7 nm filters, rejecting more sky glow.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh transmission:\u003c\/strong\u003e SVBONY specifies above 85% in both bands, which keeps exposure times practical.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOD5 average blocking:\u003c\/strong\u003e across 300–1050 nm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMinimal-halo multi-layer coating:\u003c\/strong\u003e designed to reduce glare and halos around bright stars.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e6061T aluminium cell:\u003c\/strong\u003e standard 1.25″ size with M28.5 x 0.6 thread.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9198a-3_20250828164237_5512.jpg?v=1791669949\" alt=\"SVBONY SV220 3nm filter high transmittance feature 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\/w9198a-4_20250828164246_0236.jpg?v=1791669948\" alt=\"SVBONY SV220 3nm filter minimal halo coating panel\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eOptical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eNarrowing the passband from 7 nm to 3 nm passes the same emission-line signal from the nebula while admitting less than half the background sky light in each band. The result is a darker background and higher target contrast, at the cost of slightly fainter stars. Because the passbands are tight, the filter performs best on optics that are not extremely fast, where the steep light cone shifts the effective passband. The minimal-halo coating addresses the reflections that narrowband filters can produce around bright stars.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9198a-5_20250828164253_9868.jpg?v=1791669949\" alt=\"SVBONY SV220 3nm filter light pollution suppression 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\/w9198a-6_20250828164301_3533.jpg?v=1791669948\" alt=\"SVBONY SV220 3nm filter detail 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\u003eEmission nebulae from urban sites:\u003c\/strong\u003e H II regions, planetary nebulae and supernova remnants.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMoonlit nights:\u003c\/strong\u003e narrow passbands extend usable time around the full Moon.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBicolour imaging with a colour camera\u003c\/strong\u003e, or combined Ha+OIII data with a mono camera.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9198a-7_20250828164308_6046.jpg?v=1791669949\" alt=\"SVBONY SV220 3nm filter aluminium cell and M28.5 thread\" 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\u003eMounting:\u003c\/strong\u003e M28.5 x 0.6 male thread for 1.25″ nosepieces, filter wheels and drawers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSensor size:\u003c\/strong\u003e the 26 mm clear aperture suits 1.25″-class sensors; the SV220 2″ 3nm covers larger sensors.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptics:\u003c\/strong\u003e narrowband passbands this tight are best matched to moderate focal ratios. Send us your telescope and camera and we will confirm the fit.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9198a-8_20250828164329_6732.jpg?v=1791669948\" alt=\"SVBONY SV220 3nm 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\/w9198a-9_20250828164340_4707.jpg?v=1791669949\" alt=\"SVBONY SV220 3nm filter specifications 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\u003eImaging filter:\u003c\/strong\u003e it has no application in visual observing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEmission targets:\u003c\/strong\u003e galaxies and reflection nebulae are broadband targets and gain little from it.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExposure:\u003c\/strong\u003e tighter passbands mean longer sub-exposures than a 7 nm filter on the same target.\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 1.25″ nosepiece, filter wheel or drawer like any standard 1.25″ filter.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow does it differ from the SV220 7nm?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe 3 nm passbands reject more sky background, so contrast is higher under bright skies; the 7 nm version collects signal faster and suits darker sites and faster optics.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it work with a colour camera?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes. On a colour sensor H-alpha records in the red pixels and OIII in the green and blue.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 1.25″ 3 nm H-alpha and OIII dual narrowband filter with OD5 blocking and a minimal-halo coating for high-contrast emission-nebula imaging under bright skies.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"Default Title","offer_id":67722286071919,"sku":"W9198A","price":170.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/1_20260209103830_3399.webp?v=1791670390"},{"product_id":"svbony-sv220-2-3nm-h-alpha-oiii-dual-narrowband-filter","title":"SVBONY SV220 2″ 3nm H-Alpha \u0026 OIII Dual Narrowband Filter","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9198b_20250828175857_7509.jpg?v=1791669965\" alt=\"SVBONY SV220 2 inch 3nm H-alpha and OIII narrowband 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 SV220 2″ 3nm is a dual narrowband filter with 3 ±1 nm passbands on OIII (500.7 nm) and H-alpha (656.3 nm), average peak transmittance of 85% or more in both bands, and average OD5 blocking from 300 to 1050 nm. The 2.0 mm substrate has a 44 mm clear aperture, 60\/40 surface quality, transmitted wavefront PV ≤ λ\/4 and 30″ parallelism, mounted in a 6061T aluminium cell (Φ50.8 x 7 mm) with a single M48 x 0.75 male thread. Net weight is 12.5 g.\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 large-sensor colour or mono camera, up to full frame, from a light-polluted site and want the contrast of 3 nm passbands across the whole field.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e3 nm H-alpha and OIII passbands:\u003c\/strong\u003e isolate the emission lines tightly for high contrast under bright skies.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e≥85% average peak transmittance:\u003c\/strong\u003e keeps integration times practical.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMinimal-halo multi-layer coating:\u003c\/strong\u003e reduces glare and halos around bright stars for cleaner colour.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e44 mm clear aperture:\u003c\/strong\u003e SVBONY rates it full-frame compatible and suitable for ultra-wide-angle lenses with reduced vignetting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard 2″ cell:\u003c\/strong\u003e M48 x 0.75 thread.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9198b-1_20250828175909_6166.jpg?v=1791669965\" alt=\"SVBONY SV220 2 inch 3nm filter minimal halo coating\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eOptical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eNarrowing each passband to 3 nm keeps the nebula's line emission while admitting less than half the sky background of a 7 nm filter, so the background darkens and the target stands out. The multi-layer coating is designed to minimise the reflections between filter and sensor that cause halos around bright stars, a common issue with narrowband filters. The 44 mm aperture gives even illumination across a full-frame sensor.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9198b-2_20250828175916_5411.jpg?v=1791669965\" alt=\"SVBONY SV220 2 inch 3nm filter full-frame and wide-angle compatibility\" 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\u003eLarge emission nebulae on full-frame and APS-C sensors\u003c\/strong\u003e from urban and suburban sites.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMoonlit nights:\u003c\/strong\u003e narrow passbands extend usable imaging time.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBicolour Ha\/OIII imaging\u003c\/strong\u003e with a colour camera, or combined data with a mono camera.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9198b-3_20250828175937_5948.jpg?v=1791669965\" alt=\"SVBONY SV220 2 inch 3nm filter feature 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\/w9198b-4_20250905182837_1375.jpg?v=1791669965\" alt=\"SVBONY SV220 2 inch 3nm filter detail panel\" 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\u003eMounting:\u003c\/strong\u003e M48 x 0.75 male thread for 2″ nosepieces, filter drawers, filter wheels and M48 imaging trains.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSensors:\u003c\/strong\u003e 44 mm clear aperture, full-frame compatible per SVBONY.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptics:\u003c\/strong\u003e tight passbands are best matched to moderate focal ratios. Send us your telescope and camera and we will confirm the fit.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9198b-5_20250828175955_8446.jpg?v=1791669965\" alt=\"SVBONY SV220 2 inch 3nm filter M48 thread and cell\" 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\/w9198b-6_20250828180002_5087.jpg?v=1791669965\" alt=\"SVBONY SV220 2 inch 3nm filter specifications 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\u003eImaging filter:\u003c\/strong\u003e it has no application in visual observing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEmission targets:\u003c\/strong\u003e galaxies and reflection nebulae gain little from narrowband filtering.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExposure:\u003c\/strong\u003e 3 nm passbands call for longer sub-exposures than a 7 nm filter on the same target.\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 any M48 x 0.75 nosepiece, drawer or wheel like a standard 2″ filter.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill it cover a full-frame sensor?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eSVBONY specifies it as full-frame compatible, with a 44 mm clear aperture.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003e3 nm or 7 nm?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e3 nm gives higher contrast under bright skies; 7 nm collects signal faster and is more forgiving on very fast optics.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 2″ 3 nm H-alpha and OIII dual narrowband filter with a 44 mm full-frame aperture, minimal-halo coating and OD5 blocking for high-contrast nebula imaging from bright skies.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"Default Title","offer_id":67722305667183,"sku":"W9198B","price":356.24,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/sv220-w9198b-0_20251125105032_6111.webp?v=1791670479"}],"url":"https:\/\/ontariotelescope.com\/collections\/dual-band-svbony.oembed","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}