{"product_id":"svbony-sv191-zoom-eyepiece","title":"SVBONY SV191 7.2-21.6mm 1.25″ Zoom Eyepiece","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe SVBONY SV191 is a 1.25″ zoom eyepiece that covers 7.2 mm to 21.6 mm in one continuous 3x range. The apparent field widens from 42° at the long end to 65° at the short end, eye relief stays at 18–20 mm throughout, and the optics are a fully multi-coated 7-element, 4-group design with blackened lens edges. It weighs 167 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 want to move from a finding view to a high-power planetary view without swapping eyepieces, observe with glasses, or want one compact eyepiece for travel.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e7.2–21.6 mm continuous zoom:\u003c\/strong\u003e dial in the magnification that suits the seeing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e42°–65° apparent field:\u003c\/strong\u003e the field widens as you zoom to higher power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e18–20 mm eye relief:\u003c\/strong\u003e comfortable with eyeglasses.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e7 elements in 4 groups:\u003c\/strong\u003e fully multi-coated, with blackened lens edges for contrast.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eMetal twist-up eyecup.\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e1.25″ barrel with M28.5 x 0.6 filter thread.\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\/6383866315859845905171996.jpg?v=1791651294\" alt=\"SVBONY SV191 zoom eyepiece installation diagram\" 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 until the seeing limits the view, then back off slightly for the sharpest image.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDouble stars and clusters\u003c\/strong\u003e across a range of magnifications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTravel kits\u003c\/strong\u003e where one eyepiece replaces several.\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\u003eBarrel:\u003c\/strong\u003e 1.25″, fits any 1.25″ diagonal or focuser.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilters:\u003c\/strong\u003e M28.5 x 0.6 thread for standard 1.25″ filters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWith the SVBONY MK127:\u003c\/strong\u003e at 1500 mm focal length the SV191 gives about 69x to 208x, a range that covers most lunar and planetary nights. A 1.25″ diagonal such as the SV188P sits between the eyepiece and the telescope's SCT-to-1.25″ adapter.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e\n\u003cstrong\u003eNarrower field at low power:\u003c\/strong\u003e at 21.6 mm the apparent field is 42°, so wide-field sweeping is better served by a dedicated low-power wide-angle eyepiece.\u003c\/li\u003e\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 slides into any 1.25″ diagonal or focuser. Turn the zoom barrel to change magnification and refocus slightly as needed.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use it with glasses?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes. Eye relief is 18–20 mm across the zoom range.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it take filters?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes. Standard 1.25″ filters thread into its M28.5 x 0.6 filter thread.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 7.2–21.6 mm 1.25″ zoom eyepiece with long eye relief and a field that widens to 65°, covering low to high power in one compact eyepiece.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"Default Title","offer_id":67720868003951,"sku":"W9150A","price":128.24,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9150a-0_20251231153302_1233.webp?v=1791651468","url":"https:\/\/ontariotelescope.com\/products\/svbony-sv191-zoom-eyepiece","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}