{"product_id":"svbony-sv190-10mm-ultra-flat-field-eyepiece","title":"SVBONY SV190 10mm 1.25″ Ultra Flat Field Eyepiece","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387037183457111308977863.jpg?v=1791669917\" alt=\"SVBONY SV190 10mm ultra flat field 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 SV190 10 mm is a 1.25″ ultra flat field eyepiece with a 60° apparent field of view. Its 5-element, 4-group fully multi-coated design flattens field curvature toward the edge, so stars stay sharp across more of the view than in a simple Plössl. Eye relief is 16 mm, the field stop is 14.7 mm, and the barrel carries a standard M28.5×0.6 filter thread. It weighs 84 g.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9149a-1_20250806175207_4553.jpg?v=1791670369\" alt=\"SVBONY SV190 10mm 1.25 inch ultra flat field eyepiece\" 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 a medium-high power eyepiece for the Moon, planets, double stars and smaller deep-sky objects, with a flatter field and more eye relief than a 10 mm Plössl, including if you observe with glasses.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eUltra flat field:\u003c\/strong\u003e designed to reduce edge curvature and distortion.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e60° apparent field\u003c\/strong\u003e at 10 mm focal length.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e16 mm eye relief\u003c\/strong\u003e with a rubber eyecup.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e5 elements in 4 groups\u003c\/strong\u003e, fully multi-coated, with oversized lenses and blackened lens edges.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAluminium body\u003c\/strong\u003e with a filter-threaded 1.25″ barrel.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387037657636926234414168.jpg?v=1791669917\" alt=\"SVBONY SV190 10mm flat field eyepiece optical design panel\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eOptical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe five-element layout uses oversized lenses and a field-flattening group so that the image stays in focus closer to the field stop. With a 14.7 mm field stop and 60° apparent field, the true field in your telescope is the 60° divided by the magnification (telescope focal length ÷ 10 mm). Broadband multi-coatings on all air-glass surfaces keep transmission and contrast up on bright targets.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLunar and planetary observing\u003c\/strong\u003e at medium-high magnification.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eDouble stars and globular clusters.\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSmall deep-sky objects\u003c\/strong\u003e such as planetary nebulae.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9149a-2_20250806175207_4585.jpg?v=1791670369\" alt=\"SVBONY SV190 10mm eyepiece barrel and eyecup\" 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\u003eBarrel:\u003c\/strong\u003e 1.25″, fits 1.25″ focusers, diagonals and 2″-to-1.25″ adapters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilter thread:\u003c\/strong\u003e M28.5×0.6 for standard 1.25″ filters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread under the eyecup:\u003c\/strong\u003e M34×0.75.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompanion focal length:\u003c\/strong\u003e SVBONY makes the SV190 in 18 mm as well (65°, 20 mm eye relief).\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387056114060839864413406.jpg?v=1791669917\" alt=\"SVBONY SV190 10mm flat field eyepiece threads and eyecup detail\" 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\u003eEye relief figure:\u003c\/strong\u003e SVBONY's specification table lists 16 mm; its description text mentions 10 mm. We list the table figure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.25″ only:\u003c\/strong\u003e no 2″ skirt.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNet weight 84 g\u003c\/strong\u003e; package size 110 × 76 × 70 mm.\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 any 1.25″ focuser or diagonal and is held by the thumbscrew.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the apparent field?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e60°.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use filters with it?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes. The barrel takes standard M28.5×0.6 1.25″ filters.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use it with glasses?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eSVBONY describes the eye relief as suitable for eyeglass wearers; the published figure is 16 mm.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 10 mm, 60° flat field 1.25″ eyepiece with 5-element FMC optics and 16 mm eye relief, for sharp medium-high power views of the Moon, planets and compact deep-sky objects.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"Default Title","offer_id":67722281287791,"sku":"W9149A","price":61.55,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9149a-0_20251231154154_6726.webp?v=1791670369","url":"https:\/\/ontariotelescope.com\/products\/svbony-sv190-10mm-ultra-flat-field-eyepiece","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}