{"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","url":"https:\/\/ontariotelescope.com\/products\/svbony-sv240-2-inch-multi-narrowband-filter","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}