{"product_id":"svbony-sv137-3x-fmc-barlow-lens-125in","title":"SVBONY SV137 3X FMC Barlow Lens - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eDoubles the magnification of any 1.25\" eyepiece\u003c\/li\u003e\n\u003cli\u003eFully multi-coated (FMC) lenses for maximum light transmission\u003c\/li\u003e\n\u003cli\u003eStandard 1.25\" barrel diameter fits all standard focusers\u003c\/li\u003e\n\u003cli\u003eCNC-machined aluminum body for durability\u003c\/li\u003e\n\u003cli\u003eInternal brass ring to protect eyepiece barrels from scratches\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eSVBONY SV137 1.25\" 2X FMC Barlow Lens\u003c\/h2\u003e\n\u003cp\u003eThe SVBONY SV137 1.25\" 2X FMC Barlow Lens doubles the magnification of any 1.25\" eyepiece, effectively expanding your collection without the cost of new eyepieces. This simple and robust optical accessory is an essential tool for getting closer views of the Moon, planets, and tight double stars through virtually any telescope.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e2X Magnification Boost with Fully Multi-Coated Lenses\u003c\/h3\u003e\n\u003cp\u003eBy placing the SV137 Barlow between your eyepiece and focuser, you instantly get a 2X power increase. The fully multi-coated (FMC) lenses ensure that as magnification increases, light transmission remains high, preserving the brightness and contrast of the original image for sharp, clear views.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e1.25\" CNC Body with Brass Compression Ring\u003c\/h3\u003e\n\u003cp\u003eBuilt from a single piece of CNC-machined aluminum, the SV137 is designed for durability and precise alignment. Unlike basic models that use a thumbscrew to directly contact the eyepiece, this Barlow features an internal brass compression ring that provides a secure, mar-free grip, protecting the barrels of your 1.25\" eyepieces from scratches and sleeking.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the SVBONY SV137 2X Barlow affect my view of Jupiter in a 4\" refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIn a typical 4\" f\/7 refractor, a 10mm eyepiece yields 70x magnification. Adding the SVBONY SV137 2X Barlow increases this to 140x, a much better scale for resolving Jupiter's main cloud bands and the Galilean moons. The fully multi-coated optics help maintain image brightness at this higher power.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the advantage of the brass compression ring on the SV137 Barlow?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003ebrass compression ring\u003c\/strong\u003e provides a significant advantage over simple set-screw designs. When you tighten the thumbscrew, the soft brass ring gently and evenly tightens around your eyepiece barrel. This prevents the screw from digging into and scratching the barrel, preserving the condition of your eyepieces.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the SVBONY SV137 Barlow work with all my 1.25\" eyepieces?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the SVBONY SV137 is designed to work with any standard 1.25\" format eyepiece. It also fits any telescope focuser, diagonal, or accessory that accepts 1.25\" barrels, making it a universally compatible accessory.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhen should I use the SVBONY SV137 2X Barlow instead of just a higher-power eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA Barlow lens is an economical way to double the number of magnifications you have available. It's particularly useful for a few key reasons:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaintaining Eye Relief:\u003c\/strong\u003e It allows you to achieve high power while using a longer focal length eyepiece, which typically has more comfortable eye relief.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImaging:\u003c\/strong\u003e Barlows are essential for increasing the image scale for planetary and lunar photography with webcams or dedicated astronomy cameras.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do the SV137's multi-coated lenses help when observing the Moon's craters?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Moon is a very bright object, and internal reflections can reduce contrast, washing out fine details. The \u003cstrong\u003efully multi-coated (FMC)\u003c\/strong\u003e lenses on the SVBONY SV137 suppress these reflections, resulting in a darker background sky and higher contrast, which makes subtle features along the lunar terminator and inside crater walls stand out more clearly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the difference between this SVBONY SV137 2X Barlow and a 3X Barlow?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA 2X Barlow is more versatile and can be used on more nights of average atmospheric seeing. A 3X Barlow provides much higher magnification but requires very stable seeing conditions to provide a sharp image. The 2X is an excellent all-around choice, while a 3X is a more specialized tool for nights of exceptional stability or for use with long focal length telescopes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnification Factor\u003c\/td\u003e\n\u003ctd\u003e2X\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Coatings\u003c\/td\u003e\n\u003ctd\u003eFully Multi-Coated (FMC)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Material\u003c\/td\u003e\n\u003ctd\u003eCNC-Machined Aluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEyepiece Holder\u003c\/td\u003e\n\u003ctd\u003eBrass Compression Ring\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/svbony-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eSVBONY 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SVBONY","offers":[{"title":"Default Title","offer_id":52861235953949,"sku":"SV-W9106D","price":15.48,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-SV137-1-25-2X-FMC-Barlow-Lens-with-Brass-Ring-for-Telescope-1-W9106D_9ebb4e5d-12a7-458f-ac80-eee37f0eb10d.jpg?v=1788660168","url":"https:\/\/davidastro.com\/fr-us\/products\/svbony-sv137-3x-fmc-barlow-lens-125in","provider":"David Astro","version":"1.0","type":"link"}