{"product_id":"svbony-f9108a-2x-barlow-lens","title":"SVBONY 2x Barlow Lens 1.25″ with M42 Threads","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/1_20250806112505_9310_20260820165422_3718.webp?v=1791670001\" alt=\"SVBONY F9108A 1.25″ 2x Barlow lens with M42 threads\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe SVBONY F9108A is a 1.25″ (31.7 mm) 2x Barlow lens. It slides into a 1.25″ focuser or diagonal, accepts a 1.25″ eyepiece on top, and doubles the magnification that eyepiece gives on your telescope. The optics are optical glass with a multilayer broadband green coating, set in a black metal housing 7.5 cm (2.95″) long, with an M42 x 0.75 thread for camera use.\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 visually and want more magnification from the eyepieces you already own, or if you want a simple way to extend focal length for lunar and planetary imaging with an M42-threaded camera adapter.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e2x magnification factor:\u003c\/strong\u003e a 20 mm eyepiece behaves like a 10 mm, effectively doubling your eyepiece set.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMultilayer broadband coating:\u003c\/strong\u003e applied to the optical glass to keep light loss low and contrast high.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAll-metal housing:\u003c\/strong\u003e black metal body, 7.5 cm long.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard 1.25″ barrel:\u003c\/strong\u003e fits 1.25″ focusers, diagonals and eyepieces.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM42 x 0.75 thread:\u003c\/strong\u003e lets the Barlow connect into an M42 (T2) camera train.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eA Barlow is a negative lens placed ahead of the focal plane. It lengthens the effective focal length of the telescope, so a 1000 mm telescope works as roughly 2000 mm with this lens at its rated position. Because the focal ratio doubles as well, image scale doubles for a camera and magnification doubles for an eyepiece, while eye relief and the eyepiece's apparent field are largely unchanged.\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 higher magnification on the Moon, Jupiter, Saturn and Mars.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDouble stars:\u003c\/strong\u003e extra power for splitting close pairs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlanetary imaging:\u003c\/strong\u003e longer effective focal length for a larger image scale with an M42-threaded camera.\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″ (31.7 mm) for 1.25″ focusers and diagonals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEyepieces:\u003c\/strong\u003e accepts standard 1.25″ eyepieces.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCamera use:\u003c\/strong\u003e M42 x 0.75 thread for M42\/T2 camera adapters.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eIf you are pairing it with a specific camera or adapter, send us your setup and we will confirm the connection with you.\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\u003eMagnification is limited by conditions:\u003c\/strong\u003e doubling power also enlarges atmospheric turbulence, so the highest combinations work best on steady nights.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.25″ only:\u003c\/strong\u003e it does not accept 2″ eyepieces.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e SVBONY does not publish a weight for this Barlow.\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 goes into the focuser or diagonal like an eyepiece, and your eyepiece goes into the top of the Barlow.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does 2x mean in practice?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eEach eyepiece gives twice its usual magnification. A 25 mm eyepiece on a 1000 mm telescope gives 40x on its own and 80x with the Barlow.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use it for photography?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes. The M42 x 0.75 thread lets it sit in an M42-threaded camera train for lunar and planetary imaging.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a compact 1.25″ 2x Barlow with multi-coated optics and an M42 thread, doubling the magnification of your existing eyepieces for lunar and planetary work.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"Default Title","offer_id":67722200940655,"sku":"F9108A","price":21.38,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/1_20250806112505_9310_20260820165422_3718.webp?v=1791670001","url":"https:\/\/ontariotelescope.com\/products\/svbony-f9108a-2x-barlow-lens","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}