{"product_id":"svbony-sv199-atmospheric-dispersion-corrector","title":"SVBONY SV199 1.25″ Atmospheric Dispersion Corrector (ADC)","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387868175796344747593816.jpg?v=1791669941\" alt=\"SVBONY SV199 1.25 inch atmospheric dispersion corrector 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 SV199 is a 1.25″ atmospheric dispersion corrector (ADC) for planetary and lunar work. When a planet sits low in the sky, the atmosphere acts like a weak prism and spreads its light into a blue fringe on one side and a red fringe on the other. The SV199 places a pair of adjustable BK7 wedge prisms in the light path to counter that spread. It has a 24 mm effective aperture, a 2°–2.5° deviation angle, a 1.25″ barrel with T2 thread on the telescope side, a T2 male thread on the camera side, and a built-in bubble level. It weighs 405 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 or observe the planets and the Moon, particularly when they sit at modest altitudes where atmospheric dispersion softens detail and adds colour fringes.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTwin wedge prisms:\u003c\/strong\u003e one pair of BK7 wedge prisms with 1λ surface accuracy, adjusted with plastic levers against a metal scale dial.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDouble-sided anti-reflection coating:\u003c\/strong\u003e UV-AR coated for 300–700 nm to limit scatter and ghosting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBlackened prism edges:\u003c\/strong\u003e matte ink on the prism edges and blackened lateral surfaces for contrast.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBubble level:\u003c\/strong\u003e sets the ADC horizontal so the correction direction can be set reliably.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCNC body:\u003c\/strong\u003e 30 × 48 mm, with a 0.05 mm thread tolerance and side locking screws at the eyepiece end.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387868178632312151917540.jpg?v=1791669940\" alt=\"SVBONY SV199 ADC wedge prism pair 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\/6387868180682643686727205.jpg?v=1791669941\" alt=\"SVBONY SV199 ADC bubble level\" 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\/6387868182723448149560130.jpg?v=1791669941\" alt=\"SVBONY SV199 ADC adjustment levers and scale\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eOptical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe two wedge prisms each deviate light by 2°–2.5° and disperse it slightly. Rotating them relative to each other with the two levers varies the combined dispersion from zero up to its maximum, and you set it so that it cancels the atmospheric dispersion for the planet's altitude. The prisms are BK7 with a 24 mm optical aperture, which suits the narrow light cone of a planetary imaging train. SVBONY notes that the improvement is especially visible in the luminance channel when imaging in LRGB.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlanetary imaging\u003c\/strong\u003e of Jupiter, Saturn, Mars and Venus with a high-frame-rate camera.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLunar imaging\u003c\/strong\u003e where fine crater detail is softened by colour spread.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVisual planetary observing\u003c\/strong\u003e with an eyepiece behind the ADC.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLRGB planetary work\u003c\/strong\u003e, where SVBONY highlights the gain in the luminance channel.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387868161570075158597585.jpg?v=1791669941\" alt=\"SVBONY SV199 ADC application scenarios for planetary imaging and viewing\" 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\u003eTelescope side:\u003c\/strong\u003e 1.25″ barrel with T2 male thread.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEyepiece \/ camera side:\u003c\/strong\u003e T2 female thread at the lower end with a 1.25″ eyepiece mount and side locking screws.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBody interface:\u003c\/strong\u003e T2 male thread.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTrain position:\u003c\/strong\u003e it sits between the telescope (or Barlow) and the camera or eyepiece. The ADC body length is 48 mm.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387868138379665323782195.jpg?v=1791669941\" alt=\"SVBONY SV199 ADC 1.25 inch barrel and T2 thread connections\" 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\/6387868155226462117098321.jpg?v=1791669941\" alt=\"SVBONY SV199 ADC how-to-use diagram\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003eIf you would like help placing it in your planetary train with a Barlow and camera, send us your setup and we will work through it with you.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWhat's in the Box\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eSV199 1.25″ atmospheric dispersion corrector ×1\u003c\/li\u003e\n\u003cli\u003e1.25″ dust plug ×1\u003c\/li\u003e\n\u003cli\u003e1.25″ dust cover ×1\u003c\/li\u003e\n\u003cli\u003eUser manual ×1\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\u003eThe correction depends on altitude:\u003c\/strong\u003e the levers are reset as the planet rises or sets, and near the zenith little correction is needed.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.25″ format:\u003c\/strong\u003e the 24 mm aperture is sized for planetary trains rather than wide-field deep-sky imaging.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight 405 g\u003c\/strong\u003e to account for in a focuser carrying a Barlow and camera.\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\u003eSetting it up takes a few minutes. Level the body with the bubble level so the levers move horizontally, then adjust the levers while watching a bright star or planet on screen until the red and blue fringes merge.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use it visually?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes. SVBONY describes connecting an eyepiece for visual use as well as a camera.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the clear aperture?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e24 mm.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it replace a Barlow?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. It corrects dispersion only and does not change focal length.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 1.25″ ADC with a pair of adjustable BK7 wedge prisms, T2 threads on both sides and a bubble level, for cancelling atmospheric colour spread in planetary and lunar imaging and observing.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"Default Title","offer_id":67722244718703,"sku":"W9157B","price":113.49,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/sv199-w9157b-0_20251124094353_5029.webp?v=1791670193","url":"https:\/\/ontariotelescope.com\/products\/svbony-sv199-atmospheric-dispersion-corrector","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}