{"product_id":"svbony-sv190-18mm-ultra-flat-field-eyepiece","title":"SVBONY SV190 18mm 1.25″ Ultra Flat Field Eyepiece","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387037921880978879594769.jpg?v=1791669920\" alt=\"SVBONY SV190 18mm 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 18 mm is a 1.25″ ultra flat field eyepiece with a 65° apparent field of view and 20 mm of eye relief. Its 8-element, 5-group fully multi-coated design keeps stars sharp from the centre to the edge, and its 23.4 mm field stop gives a wider view than typical Plössl eyepieces. The barrel takes standard M28.5×0.6 filters, and an M42×0.75 thread under the eyecup allows a camera to be attached for eyepiece projection.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/1_20260314115625_9018.webp?v=1791670383\" alt=\"SVBONY SV190 18mm 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 low-to-medium power 1.25″ eyepiece with a wide, flat field for deep-sky scanning, the full lunar disc and wide double stars, with eye relief comfortable enough for glasses.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e65° apparent field\u003c\/strong\u003e at 18 mm, wider than a standard Plössl.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e20 mm eye relief\u003c\/strong\u003e with a rubber eyecup.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e8 elements in 5 groups\u003c\/strong\u003e, fully multi-coated.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlat field:\u003c\/strong\u003e sharp from centre to edge.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM42×0.75 thread under the eyecup\u003c\/strong\u003e for camera connection.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eLightweight, durable build.\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\/6387031149088578093963209.jpg?v=1791669920\" alt=\"SVBONY SV190 18mm flat field eyepiece 65 degree field feature panel\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eOptical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe eight-element layout includes a field-flattening group, which is what keeps stars in focus out to the 23.4 mm field stop. At 18 mm and 65°, the true field in your telescope is 65° divided by the magnification (telescope focal length ÷ 18 mm), so it frames large clusters and nebulae that a narrower eyepiece crops.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDeep-sky observing:\u003c\/strong\u003e open clusters, larger nebulae and galaxies.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhole-Moon views\u003c\/strong\u003e at moderate power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAfocal or projection photography\u003c\/strong\u003e via the M42 thread under the eyecup; SVBONY notes it can be matched with the SV406P for scenery.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387031149122166355245243.jpg?v=1791669920\" alt=\"SVBONY SV190 18mm flat field eyepiece M42 camera thread 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\u003eBarrel:\u003c\/strong\u003e 1.25″ for 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.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCamera thread:\u003c\/strong\u003e M42×0.75 under the eyecup.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompanion focal length:\u003c\/strong\u003e SVBONY makes the SV190 in 10 mm as well (60°).\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9149b-2_20250806174238_1172.jpg?v=1791670383\" alt=\"SVBONY SV190 18mm eyepiece barrel and threads\" 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\/2_20260314115626_0052.webp?v=1791670383\" alt=\"SVBONY SV190 18mm flat field eyepiece 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\u003e1.25″ only:\u003c\/strong\u003e no 2″ skirt.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e SVBONY does not publish a weight for the 18 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 slides into any 1.25″ focuser or diagonal and is held by the thumbscrew.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I attach a camera?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes. Remove the eyecup to reach the M42×0.75 thread.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow wide is the view?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e65° apparent field with a 23.4 mm field stop.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs it good with glasses?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eSVBONY describes the 20 mm eye relief as comfortable for eyeglass wearers.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: an 18 mm, 65° flat field 1.25″ eyepiece with 8-element FMC optics, 20 mm eye relief and an M42 camera thread, for wide, sharp deep-sky and lunar views.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"Default Title","offer_id":67722284728431,"sku":"W9149B","price":95.29,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9149b-0_20251231154451_0679.webp?v=1791670383","url":"https:\/\/ontariotelescope.com\/products\/svbony-sv190-18mm-ultra-flat-field-eyepiece","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}