{"product_id":"svbony-sv230-8-20mm-aspheric-zoom-eyepiece","title":"SVBONY SV230 8-20mm Aspheric Zoom Eyepiece (1.25″ and 2″)","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9185a-1_20250905190206_8933.jpg?v=1791667829\" alt=\"SVBONY SV230 8-20mm aspheric 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 SV230 is an 8–20 mm click-stop zoom eyepiece with both 1.25″ and 2″ barrels. The apparent field runs from 72° at 8 mm to 57° at 20 mm, eye relief is 17–19 mm, and the optics are a fully multi-coated 9-element, 6-group design that includes double-sided aspheric lenses to control edge distortion. It weighs 500 g.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9185a-13_20250905190937_1492.jpg?v=1791667829\" alt=\"SVBONY SV230 continuous zoom from 8mm to 20mm\" 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\/w9185a-3_20250905190338_3816.jpg?v=1791667829\" alt=\"SVBONY SV230 panoramic wide-angle field of view\" 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\/w9185a-4_20250905190405_2845.jpg?v=1791667830\" alt=\"SVBONY SV230 apparent field from 72 to 57 degrees across the zoom\" 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 want one eyepiece that covers medium to high power across the planets, the Moon and brighter deep-sky objects, observe with glasses, or use both 1.25″ and 2″ diagonals.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e8–20 mm zoom with click-stops:\u003c\/strong\u003e repeatable magnification steps that are easy to find in the dark.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e72° to 57° apparent field:\u003c\/strong\u003e the field widens toward the high-power end, where a wide view helps keep a planet in the eyepiece on an undriven mount.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e9 elements in 6 groups, including aspherics:\u003c\/strong\u003e double-sided aspheric glass reduces distortion at the field edge; all optics are fully multi-coated with blackened lens edges.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e17–19 mm eye relief:\u003c\/strong\u003e with an adjustable rubber eyecup, usable with eyeglasses.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eParfocal across the zoom range:\u003c\/strong\u003e focus holds as you zoom, with at most a small touch-up.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.25″ and 2″ barrels:\u003c\/strong\u003e both included, stainless steel, threaded M28.5 x 0.6 and M48 x 0.75 for filters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDioptrx compatible:\u003c\/strong\u003e SVBONY lists Dioptrx mounting as supported.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9185a-14_20250905191014_1481.jpg?v=1791667829\" alt=\"SVBONY SV230 long eye relief for eyeglass wearers\" 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\/w9185a-16_20250905191043_9860.jpg?v=1791667830\" alt=\"SVBONY SV230 adjustable rubber eyecup\" 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\/w9185a-15_20250905191027_4634.jpg?v=1791667829\" alt=\"SVBONY SV230 rubber eyecup detail\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eOptical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eZoom eyepieces trade some field width for convenience, and edge sharpness is where simpler designs give ground. The SV230 uses nine elements in six groups, with double-sided aspheric lenses that SVBONY specifies to suppress distortion toward the field edge. Because the apparent field grows as focal length shortens, the true field shrinks less than it would with a fixed-field zoom when you step up in power.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9185a-9_20250905190716_8424.jpg?v=1791667829\" alt=\"SVBONY SV230 aspheric lens design\" 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\/w9185a-11_20250905190845_5122.jpg?v=1791667830\" alt=\"SVBONY SV230 fully multi-coated optics\" 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\/w9185a-12_20250905190912_0739.jpg?v=1791667829\" alt=\"SVBONY SV230 blackened lens edges\" 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 step up through the click-stops until the seeing sets the limit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClusters and brighter deep-sky objects:\u003c\/strong\u003e the 20 mm end gives a moderate-power starting view.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDouble stars:\u003c\/strong\u003e fine-tune magnification to split a pair.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9185a-10_20250905190829_2113.jpg?v=1791667829\" alt=\"SVBONY SV230 parfocal zoom\" 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\u003eBarrels:\u003c\/strong\u003e 1.25″ and 2″ barrels are both included, so it fits either size of diagonal or focuser.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilters:\u003c\/strong\u003e M28.5 x 0.6 thread on the 1.25″ barrel and M48 x 0.75 on the 2″ barrel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCamera projection:\u003c\/strong\u003e SVBONY notes an M43 T-mount connection through an M43-T adapter, sold separately.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMagnification:\u003c\/strong\u003e divide your telescope's focal length by the eyepiece focal length. On a 1000 mm telescope the SV230 gives 50x at 20 mm and 125x at 8 mm.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9185a-5_20250905190503_9665.jpg?v=1791667829\" alt=\"SVBONY SV230 dual 1.25 inch and 2 inch interfaces\" 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\/w9185a-7_20250905190610_2790.jpg?v=1791667829\" alt=\"SVBONY SV230 1.25 inch and 2 inch barrels\" 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\/w9185a-8_20250905190656_2263.jpg?v=1791667829\" alt=\"SVBONY SV230 astigmatism corrector support and M43 T-mount\" 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\u003eSize and weight:\u003c\/strong\u003e at 500 g and 60 mm outer diameter it is a substantial eyepiece; balance on lighter alt-az mounts may need adjusting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCamera adapter:\u003c\/strong\u003e the M43-T adapter for camera projection is not included.\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. Choose the 1.25″ or 2″ barrel to suit your diagonal, insert it, and turn the zoom ring to a click-stop. Focus holds across the range with at most a small adjustment.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use it with glasses?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes. Eye relief is 17–19 mm and the rubber eyecup adjusts.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it take filters?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes. 1.25″ filters thread onto the 1.25″ barrel (M28.5 x 0.6) and 2″ filters onto the 2″ barrel (M48 x 0.75).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow does it differ from the SV215?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe SV230 covers 8–20 mm with a field up to 72° and longer eye relief; the SV215 covers the shorter 3–8 mm planetary range in a 1.25″ barrel.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: an 8–20 mm click-stop zoom eyepiece with aspheric optics, a 72° to 57° field and 17–19 mm eye relief, supplied with both 1.25″ and 2″ barrels.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"Default Title","offer_id":67721422864495,"sku":"W9185A","price":427.49,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/W9185A-0_20251210141527_5819.webp?v=1791665183","url":"https:\/\/ontariotelescope.com\/products\/svbony-sv230-8-20mm-aspheric-zoom-eyepiece","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}