{"product_id":"svbony-sv245-8-16mm-zoom-eyepiece","title":"SVBONY SV245 8–16 mm Zoom Eyepiece (1.25″ \/ 2″, 63°)","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387869269134401713365617.jpg?v=1791670100\" alt=\"SVBONY SV245 8–16 mm zoom eyepiece 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 SV245 is an 8–16 mm zoom eyepiece with a 63° apparent field of view, a dual 1.25″ and 2″ barrel and click stops at each focal-length setting. Its 8-element, 5-group optical design is fully multi-coated with blackened lens edges, eye relief is 17–18 mm, and the eyepiece is parfocal across the zoom range. It measures 129 x 60 mm and weighs 486 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 observe the Moon and planets and want to step between magnifications to match the seeing without swapping eyepieces, if you observe with glasses and need room at the eyecup, or if you use an SVBONY spotting scope that SVBONY lists as compatible.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e8–16 mm, 2x zoom:\u003c\/strong\u003e a 63° apparent field that stays consistent as you zoom.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e8 elements in 5 groups:\u003c\/strong\u003e fully multi-coated optics with blackened lens edges for contrast.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClick-stop design:\u003c\/strong\u003e a detent at each focal length from 8 mm to 16 mm for repeatable settings without play.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eParfocal:\u003c\/strong\u003e focus holds closely through the zoom range.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e17–18 mm eye relief:\u003c\/strong\u003e with a folding rubber eye guard for observing with or without glasses.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual barrel:\u003c\/strong\u003e stainless-steel 1.25″ barrel and aluminium-alloy 2″ barrel, with M28.5 x 0.6 and M48 x 0.75 filter threads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAstigmatism corrector support:\u003c\/strong\u003e mainstream correctors can be fitted.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387869268995673331189664.jpg?v=1791670100\" alt=\"SVBONY SV245 8–16 mm zoom eyepiece 8-element optical design\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eOptical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe eight elements are arranged in five groups, with multi-coating on every air-to-glass surface and blackened edges to suppress stray light. Holding a 63° field across a 2x zoom range keeps the framing familiar as magnification changes, and parfocal behaviour means the image stays close to focus while you move between settings. The long eye relief comes from the eyepiece's optical layout, so the full field is visible from behind eyeglasses.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387869269068745829141512.jpg?v=1791670100\" alt=\"SVBONY SV245 8–16 mm zoom eyepiece 17–18 mm eye relief\" 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\u003ePlanetary and lunar observing:\u003c\/strong\u003e zoom in and out with the seeing to find the sharpest magnification.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDouble stars and clusters\u003c\/strong\u003e at medium to high power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDaytime spotting-scope use:\u003c\/strong\u003e SVBONY lists the SA401 APO and SV406P spotting scopes as compatible.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387869269036599698874126.jpg?v=1791670100\" alt=\"SVBONY SV245 8–16 mm zoom eyepiece click-stop zoom detents\" 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\/6387869269102285073699800.jpg?v=1791670100\" alt=\"SVBONY SV245 8–16 mm zoom eyepiece click-stop detail\" 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\u003eFocusers and diagonals:\u003c\/strong\u003e fits 1.25″ and 2″ eyepiece holders; the 2″ lens interface is included.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilters:\u003c\/strong\u003e M28.5 x 0.6 thread on the 1.25″ barrel, M48 x 0.75 on the 2″ barrel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpotting scopes:\u003c\/strong\u003e SVBONY lists the SA401 APO and SV406P; the SA406 eyepiece adapter connects the SA401 to the SV245.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAstigmatism correctors:\u003c\/strong\u003e mainstream correctors can be installed.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eWhat's in the Box\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e1 x SVBONY SV245 8–16 mm zoom eyepiece\u003c\/li\u003e\n\u003cli\u003e1 x 2″ lens interface\u003c\/li\u003e\n\u003cli\u003e3 x Dust caps\u003c\/li\u003e\n\u003cli\u003e1 x Eyepiece soft bag\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\u003eWeight:\u003c\/strong\u003e at 486 g it is heavier than most fixed eyepieces, which is worth accounting for in balance on a small mount.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOuter diameter:\u003c\/strong\u003e 60 mm, so it suits diagonals and focusers that clear a 60 mm body.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExit pupil:\u003c\/strong\u003e focal length and magnification depend on your telescope; get in touch if you want us to work out the range for your scope.\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 drops into a 1.25″ holder directly or into a 2″ holder with the included interface, and you zoom by turning the barrel between click stops.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo I need to refocus when zooming?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eVery little. SVBONY specifies the SV245 as parfocal, so only small focus touch-ups are typical.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use it with glasses?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes. Eye relief is 17–18 mm and the eye guard folds down for glasses wearers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow does it compare with the SV230?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eSVBONY publishes the SV245 at 8–16 mm with a 63° field, 8 elements in 5 groups and 486 g; the SV230 covers 8–20 mm with a 57–72° field, 9 elements in 6 groups and 500 g.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: an 8–16 mm, 63° zoom eyepiece with click stops, parfocal operation, 17–18 mm eye relief and a dual 1.25″\/2″ barrel, suited to high-power planetary and lunar observing.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"Default Title","offer_id":67722301767791,"sku":"W9192A","price":227.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/W9192A-0_20260408151225_8862.webp?v=1791670462","url":"https:\/\/ontariotelescope.com\/products\/svbony-sv245-8-16mm-zoom-eyepiece","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}