{"title":"SVBONY Barlow Lenses","description":"\u003cp\u003eSVBONY Barlow lenses multiply the magnification of any eyepiece, so a small set covers more powers. The SV137 comes in fully multi-coated 2X and 3X versions, the SV136 is a 3X, and the SV216 2X uses a 4-element design for sharper edges. A 5X model reaches the high power needed for planetary imaging.\u003c\/p\u003e\u003cp\u003eThe 2X versions with M42 threads let you attach a camera directly, useful for imaging the Moon, planets and double stars. All take 1.25\" eyepieces.\u003c\/p\u003e","products":[{"product_id":"svbony-5x-barlow-lens-125in","title":"SVBONY 5X Barlow Lens - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e5X Magnification Power\u003c\/li\u003e\n\u003cli\u003e1.25\" (31.7mm) Barrel Size\u003c\/li\u003e\n\u003cli\u003eMulti-Coated Optical Glass\u003c\/li\u003e\n\u003cli\u003eDurable Metal Housing\u003c\/li\u003e\n\u003cli\u003eWeight: 3.0oz (85g)\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 Barlow Lens 1.25 inch 5X\u003c\/h2\u003e\n\u003cp\u003eThe Svbony 5X Barlow Lens quintuples the magnification of any 1.25-inch eyepiece, providing the power needed for high-resolution planetary and lunar observation. Constructed from metal and optical glass, its lightweight 3.0oz (85g) body adds minimal weight to your focuser, preserving your telescope's balance while delivering extreme magnification.\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\u003e5X Magnification: Pushing Your Telescope to its Planetary Limits\u003c\/h3\u003e\n\u003cp\u003eA 5X magnification factor is a specialized tool designed to extract the maximum possible detail on bright targets. This level of power allows you to resolve fine craterlet chains on the Moon, separate tight double stars, and discern subtle cloud bands on Jupiter or the Cassini Division in Saturn's rings, even with shorter focal length telescopes.\u003c\/p\u003e\n\u003cp\u003eAchieving sharp views at 5X requires stable atmospheric seeing. On nights of excellent seeing, this Barlow transforms your view, but on nights of average seeing, a lower-power Barlow will yield a more stable image. It is an essential accessory for dedicated planetary imagers and observers who want to be ready when conditions permit.\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\u003eOptical Quality: Multi-Coated Glass in a 3.0oz Metal Housing\u003c\/h3\u003e\n\u003cp\u003eThe Svbony 5X Barlow uses multi-coated optical glass elements to maximize light transmission and reduce internal reflections. This ensures that the high-magnification views are as bright and high-contrast as possible, preventing a \"washed-out\" image that can occur with inferior optics.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMetal Construction:\u003c\/strong\u003e The housing is machined from metal, providing a durable and secure fit in your focuser and for your eyepiece.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLightweight Design:\u003c\/strong\u003e At just 3.0oz (85g), it won't cause significant balance issues on most telescope mounts, a critical factor when imaging at high focal lengths.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard Barrel:\u003c\/strong\u003e The 1.25\" barrel is compatible with the vast majority of astronomical eyepieces and accessories.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eSvbony 5X vs. 2X\/3X Barlows: When to Use Maximum Magnification\u003c\/h3\u003e\n\u003cp\u003eWhile 2X and 3X Barlows are general-purpose accessories, the 5X Barlow is a specialist's tool. It excels in specific scenarios where lower-power Barlows may not provide enough image scale.\u003c\/p\u003e\n\u003cp\u003eChoose the 5X Barlow when your goal is to achieve the largest possible image scale for planetary imaging, especially with cameras that have larger pixels. Visually, it's the right choice for observers with short focal length refractors or those attempting to split the most challenging double stars. For general deep-sky or wide-field lunar viewing, a 2X Barlow remains the more versatile option.\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\"\u003eWhat is the main purpose of the Svbony 5X Barlow Lens?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary purpose of the Svbony 5X Barlow is to dramatically increase magnification for observing and imaging bright, small targets. It is ideal for detailed views of planets like Jupiter and Saturn, lunar craters, and for splitting tight double stars.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Svbony 5X Barlow work with my telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, if your telescope uses a 1.25\" focuser and accepts 1.25\" eyepieces, the Svbony 5X Barlow is compatible. Its standard \u003cstrong\u003e1.25\" (31.7mm)\u003c\/strong\u003e barrel fits all standard focusers and diagonals of that size.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs a 5X magnification too much power for my telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA 5X magnification can exceed the useful magnification limit of a telescope, especially on nights with poor atmospheric \"seeing.\" A general rule is to not exceed 50x-60x per inch of aperture. This Barlow is most effective on nights of very steady air or for planetary imaging, where large image scale is the priority.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Svbony 5X Barlow affect image brightness?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAny increase in magnification spreads the same amount of light over a larger area, resulting in a dimmer image. A 5X increase will make the image significantly dimmer than with no Barlow. This is why it's best suited for bright objects like the Moon and planets, not faint deep-sky objects like nebulae or galaxies.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Svbony 5X Barlow to see the Cassini Division on Saturn with my 80mm refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, under very steady atmospheric conditions, an 80mm refractor can reveal the Cassini Division. Using the Svbony 5X Barlow will provide the necessary magnification to make the gap more apparent, but the final image quality will be entirely dependent on the stability of the atmosphere (seeing).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Svbony 5X Barlow a good choice for imaging Jupiter with a planetary camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. For planetary imaging, achieving a large image scale on the camera sensor is critical. The Svbony 5X Barlow is an excellent tool for this, allowing you to capture fine details in Jupiter's cloud bands. It helps you achieve the optimal focal ratio (typically f\/15-f\/25) for high-resolution imaging with modern CMOS cameras.\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\u003eItem Name\u003c\/td\u003e\n\u003ctd\u003e1.25\" 5x Barlow Lens\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e1.25\" (31.7mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnification Power\u003c\/td\u003e\n\u003ctd\u003e5X\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eMetal + Optical glass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e3.0oz (85g)\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":52861233168669,"sku":"SV-F9102A","price":21.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-Barlow-Lens-1-25-inch-5X-1_8dabccc8-733b-498a-989f-fcf6ba205d87.jpg?v=1788659965"},{"product_id":"svbony-2x-barlow-lens-with-m42-threads-125in","title":"SVBONY 2X Barlow Lens with M42 Threads - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e2X Magnification Factor\u003c\/li\u003e\n\u003cli\u003eStandard 1.25\" Diameter Barrel\u003c\/li\u003e\n\u003cli\u003eIntegrated M42x0.75 T-Threads for Cameras\u003c\/li\u003e\n\u003cli\u003eMultilayer HD Broadband Green Film Coatings\u003c\/li\u003e\n\u003cli\u003eFull Metal Construction\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\u003e2X Barlow 1.25inch with M42 Threads\u003c\/h2\u003e\n\u003cp\u003eThis 2X Barlow lens instantly doubles the power of any 1.25\" eyepiece and features an integrated M42x0.75 thread for direct camera attachment. Constructed from solid metal with a compact 7.5cm length, its pure optical glass lenses are treated with a multilayer HD broadband green film to maximize image contrast and light transmission.\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 with Multilayer HD Coatings\u003c\/h3\u003e\n\u003cp\u003eBy doubling the magnification of your eyepiece collection, this 2X Barlow brings fine details on Jupiter's cloud bands and the Moon's craters into sharp focus. The pure optical glass lenses feature a multilayer HD broadband green film, ensuring the magnified view remains bright and high-contrast by mitigating the inherent light loss of adding extra glass elements.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDouble Your Eyepiece Collection:\u003c\/strong\u003e Effectively turns your existing eyepieces into a set with twice the magnification options, ideal for achieving the optimal power for planetary viewing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-Contrast Views:\u003c\/strong\u003e The multilayer HD green film preserves the original image quality by minimizing internal reflections, which is critical for discerning subtle planetary features.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eM42 x 0.75 Threads for Direct Camera Attachment\u003c\/h3\u003e\n\u003cp\u003eThe integrated M42x0.75 thread transforms this Barlow from a visual accessory into an imaging tool. This standard T-thread allows you to securely connect a DSLR or dedicated astronomy camera (with the appropriate T-ring, not included) directly to the Barlow, creating a solid optical train for high-magnification lunar and planetary astrophotography.\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\u003eAll-Metal Construction in a 2.95-inch Body\u003c\/h3\u003e\n\u003cp\u003eBuilt entirely from metal, this Barlow is designed for rigidity and long-term use in the field. At a length of just 2.95 inches (7.5cm), it adds minimal length to your imaging train and balances easily, while providing a secure, non-flexing platform for both heavy eyepieces and cameras.\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 does this 2X Barlow lens affect my telescope's focal length?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis 2X Barlow doubles your telescope's effective focal length. For example, if you have a telescope with a 1000mm focal length, using this Barlow makes it perform like a 2000mm telescope, doubling the magnification of any eyepiece you use with it.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat do I need to connect my camera to the Barlow's M42 threads?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou will need a \u003cstrong\u003eT-ring\u003c\/strong\u003e that is specific to your camera's lens mount (e.g., Canon EOS, Nikon F, Sony E-mount). The T-ring screws onto the Barlow's M42x0.75 threads, and your camera body then attaches to the T-ring as it would to a lens.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this 1.25-inch Barlow work with 2-inch eyepieces?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. This Barlow has a 1.25\" barrel and is designed to be used with standard 1.25\" eyepieces and accessories only. It will not fit into a 2\" focuser without an adapter, and it cannot hold a 2\" eyepiece.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs this 2X Barlow suitable for deep-sky objects?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile primarily designed for high-magnification views of bright objects like the Moon and planets, it can be used to get a closer look at smaller, bright deep-sky objects like planetary nebulae (e.g., the Ring Nebula, M57) or globular clusters (e.g., the Hercules Cluster, M13). However, it will dim the view, which is not ideal for faint galaxies or large nebulae.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will this 2X Barlow perform on Saturn with an 8-inch f\/10 SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAn 8\" f\/10 SCT has a focal length of around 2000mm. This 2X Barlow will increase that to 4000mm. With a 20mm eyepiece, this would yield 200x magnification, an excellent power for seeing Cassini's Division in Saturn's rings and subtle cloud bands on the planet's surface under steady seeing conditions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use this 2X Barlow to get a closer view of the Orion Nebula (M42) in my 4-inch refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, you can use it to magnify specific regions within the Orion Nebula (M42), such as the Trapezium star cluster at its core. However, the 2X magnification will also darken the image and significantly narrow the field of view, preventing you from seeing the entire nebula at once. For wide, bright views of M42, it's best to observe without a Barlow.\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\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e1.25\" (31.7mm)\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\u003eThread Interface\u003c\/td\u003e\n\u003ctd\u003eM42 x 0.75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Material\u003c\/td\u003e\n\u003ctd\u003ePure optical glass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Coating\u003c\/td\u003e\n\u003ctd\u003eMultilayer HD broadband green film\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Material\u003c\/td\u003e\n\u003ctd\u003eMetal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLength\u003c\/td\u003e\n\u003ctd\u003e2.95\" \/ 7.5cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eColor\u003c\/td\u003e\n\u003ctd\u003eBlack\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\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e2X Barlow 1.25inch with M42 Threads\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\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 Warranty Policy\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SVBONY","offers":[{"title":"Default Title","offer_id":52861233201437,"sku":"SV-F9108A","price":21.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-2X-Barlow-1-25inch-with-M42-Threads-1_e64cd664-136d-4d6d-b6e4-57e31838a0b7.jpg?v=1788659972"},{"product_id":"svbony-sv136-3x-barlow-lens-125in","title":"SVBONY SV136 3X Barlow Lens - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eTriples eyepiece magnification by a factor of 3x\u003c\/li\u003e\n\u003cli\u003eFits standard 1.25 inch focusers and accessories\u003c\/li\u003e\n\u003cli\u003eAchromatic 3-element, 2-group lens design minimizes color fringing\u003c\/li\u003e\n\u003cli\u003eFeatures multilayer HD broadband green film coatings for high contrast\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\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 SV136 Barlow 3x 1.25 inch\u003c\/h2\u003e\n      \u003cp\u003eThe Svbony SV136 Barlow delivers a full 3x magnification increase to any 1.25 inch eyepiece, achieved through an advanced 3-element, 2-group achromatic lens structure. This design, combined with multilayer HD broadband green film coatings, ensures that the tripled power does not come at the cost of sharpness or color fidelity, providing high-contrast views of planetary surfaces and tight double stars.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003e3-Element Achromatic Design: 3x Magnification with High Correction\u003c\/h3\u003e\n      \u003cp\u003eUnlike basic 2-element Barlows, the Svbony SV136 uses a more complex 3-element in 2-groups optical layout. This achromatic design actively corrects for chromatic aberration, preventing the distracting blue or yellow halos that can appear around bright objects like Jupiter or the lunar limb at high power. The result is a sharper, more color-pure image, allowing you to push magnification on nights of good seeing.\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eAchromatic Correction:\u003c\/strong\u003e The 3-element lens system significantly reduces false color for true-to-life views of planetary cloud bands and stellar colors.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eMultilayer HD Coatings:\u003c\/strong\u003e Fully multi-coated optics maximize light transmission and suppress internal reflections, enhancing image brightness and contrast.\u003c\/li\u003e\n      \u003c\/ul\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n    \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eMaximizing Detail in 1.25\" Fast Telescopes\u003c\/h3\u003e\n      \u003cp\u003eThis 3x Barlow is particularly effective in telescopes with short focal lengths, such as fast Newtonians or short-tube refractors. It allows you to reach the high magnifications needed for detailed planetary observation using longer eye-relief 1.25 inch eyepieces, which are far more comfortable to look through than very short focal length Plössls or orthoscopics.\u003c\/p\u003e\n      \u003cul\u003e\n          \u003cli\u003e\n\u003cstrong\u003eUniversal 1.25\" Barrel:\u003c\/strong\u003e Slides into any standard 1.25\" focuser or diagonal, making it compatible with a vast range of telescopes and eyepieces.\u003c\/li\u003e\n          \u003cli\u003e\n\u003cstrong\u003eSecure Eyepiece Lock:\u003c\/strong\u003e A built-in set screw holds your eyepiece firmly in place, preventing any wobble or accidental slips during observation.\u003c\/li\u003e\n      \u003c\/ul\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eSvbony SV136 3x vs. Standard 2x Barlows: When to Use More Power\u003c\/h3\u003e\n      \u003cp\u003eA 2x Barlow is a versatile workhorse, but a 3x Barlow like the SV136 is a specialist tool for when atmospheric conditions permit maximum magnification. On nights of steady seeing, the 3x factor can reveal finer details, such as the Cassini Division in Saturn's rings or subtle festoons in Jupiter's belts, that might be missed at 2x.\u003c\/p\u003e\n      \u003cp\u003eThe primary trade-off is sensitivity to atmospheric turbulence; a 3x Barlow will amplify poor seeing more than a 2x. However, for a dedicated planetary observer with a well-collimated telescope, the SV136 offers a critical step up in power for those fleeting moments of perfect atmospheric stability.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n\u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the advantage of the Svbony SV136's 3-element lens design?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe \u003cstrong\u003e3-element, 2-group achromatic design\u003c\/strong\u003e provides superior color correction compared to simpler 2-element Barlows. This minimizes chromatic aberration (color fringing) on high-contrast targets like the Moon and bright planets, resulting in a sharper and more natural-looking image at high magnification.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Svbony SV136 3x Barlow a good choice for my 8-inch f\/5 Dobsonian?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes, it's an excellent match. An 8-inch f\/5 Dobsonian has a focal length of about 1000mm. With a 25mm eyepiece, you get 40x magnification. Using the Svbony SV136 3x Barlow with that same eyepiece boosts the power to 120x, a great starting point for planetary detail, without requiring an uncomfortable short-focal-length eyepiece.\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 SV136 3x Barlow instead of a 2x for viewing Saturn?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eUse the \u003cstrong\u003eSvbony SV136 3x Barlow\u003c\/strong\u003e on nights of very steady atmospheric seeing. While a 2x Barlow provides a reliable power boost, the 3x is for pushing your telescope to its limit. If the air is stable, the 3x magnification can make the Cassini Division in Saturn's rings appear as a sharp, black gap, a detail that might be less distinct at 2x.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Svbony SV136 3x Barlow work with my existing 1.25\" eyepieces?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eAbsolutely. The Svbony SV136 features a standard \u003cstrong\u003e1.25 inch barrel\u003c\/strong\u003e that is compatible with virtually all 1.25\" telescope eyepieces, diagonals, and focusers from any brand. It includes a set screw to securely hold your eyepiece in place.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow do the coatings on the Svbony SV136 Barlow improve the view?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe lenses feature a \u003cstrong\u003emultilayer HD broadband green film\u003c\/strong\u003e. These advanced coatings increase light transmission and drastically reduce internal reflections and glare. This leads to a brighter, higher-contrast image, which is crucial for seeing faint details on planetary surfaces.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Svbony SV136 3x Barlow for planetary imaging?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes, it is very useful for planetary imaging. A 3x Barlow increases the effective focal length of your telescope, which enlarges the image of a planet on your camera's sensor. This allows you to capture more detail on small targets like Mars, Jupiter, and Saturn with a dedicated planetary camera.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003ctable class=\"DAV-specifications\"\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMagnification Factor\u003c\/td\u003e\n\u003ctd\u003e3x\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e1.25 inch\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eLens Structure\u003c\/td\u003e\n\u003ctd\u003e3-Elements \/ 2-Groups, Achromatic\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eMultilayer HD broadband green film\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/li\u003e\n\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":52861235495197,"sku":"SV-F9172C","price":30.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-SV136-Barlow-3x-1-25-inch-1_1248c580-3446-473c-904a-742a7daaaaf2.jpg?v=1788660096"},{"product_id":"svbony-sv137-2x-fmc-barlow-lens-with-m42-threads-125in","title":"SVBONY SV137 2X FMC Barlow Lens with M42 Threads - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eInstantly doubles the magnification of any 1.25\" eyepiece\u003c\/li\u003e\n\u003cli\u003eFully multi-coated (FMC) optics for bright, high-contrast views\u003c\/li\u003e\n\u003cli\u003eFeatures M42 x 0.75 T-threads for direct camera attachment\u003c\/li\u003e\n\u003cli\u003eBrass compression ring secures eyepieces without scratching barrels\u003c\/li\u003e\n\u003cli\u003eDurable, CNC-machined aluminum body\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 2X Barlow Lens instantly doubles the power of any 1.25\" eyepiece, effectively expanding your magnification options without needing a separate set of high-power eyepieces. With integrated M42 x 0.75 T-threads, it also serves as a 2x amplifier for astrophotography, allowing direct connection to a DSLR T-ring for planetary and lunar imaging.\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 Optics\u003c\/h3\u003e\n\u003cp\u003eThis Barlow lens doubles the magnification of your eyepiece, bringing out finer details on the Moon's surface, resolving the cloud bands of Jupiter, or splitting tight double stars. The fully multi-coated (FMC) lenses ensure that as magnification increases, light transmission remains high and contrast is preserved, preventing the washed-out images common with lesser Barlows. While any 2x Barlow narrows the field of view, the SV137's optical design maintains image sharpness and clarity.\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\u003eSecure Fit: 1.25\" Barrel with Brass Ring and M42 Threads\u003c\/h3\u003e\n\u003cp\u003eBuilt from CNC-machined aluminum, the SV137 is designed for durability in the field. Its 1.25\" barrel features a non-marring brass compression ring that provides a secure, concentric grip on your eyepiece without scratching the barrel, unlike simple thumbscrew designs. For imagers, the top of the Barlow unscrews to reveal standard M42 T-threads, creating a solid, threaded connection to your camera for stable, focused shots.\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 the view of Jupiter in my 8\" f\/10 SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIn a typical 8\" f\/10 SCT (around 2000mm focal length), a 10mm eyepiece yields 200x magnification. Adding the SVBONY SV137 Barlow will double this to 400x, which is near the practical limit for that aperture. This increased power will make Jupiter's Great Red Spot and individual cloud bands much larger and more distinct, assuming atmospheric seeing conditions are stable.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the SVBONY SV137 Barlow Lens for astrophotography?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The SV137 is ideal for planetary, lunar, and solar (with a proper telescope filter) imaging. The top section unscrews to reveal \u003cstrong\u003eM42 x 0.75 T-threads\u003c\/strong\u003e. This allows you to connect a DSLR or dedicated astronomy camera directly using a T-ring, effectively doubling your telescope's focal length and image scale to capture more detail on small targets.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the purpose 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 brass compression ring provides a superior way to secure your 1.25\" eyepieces. When you tighten the thumbscrew, it presses the soft brass ring gently and uniformly against the eyepiece barrel. This prevents the set screw from directly 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 work with a small 70mm refractor for viewing the Moon?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. A 70mm refractor is an excellent instrument for lunar observing. Using the SV137 Barlow will double the magnification of your existing eyepieces, allowing you to zoom in on specific craters, rilles, and mountain ranges on the Moon's surface for a more detailed and immersive view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eAre the optics in the SV137 Barlow fully multi-coated?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the SVBONY SV137 features \u003cstrong\u003efully multi-coated (FMC)\u003c\/strong\u003e lenses. This means all air-to-glass surfaces have multiple layers of anti-reflection coatings applied, which maximizes light transmission and enhances image contrast and brightness compared to optics that are only single-coated or partially coated.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the SVBONY SV137 compatible with all 1.25\" eyepieces?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the SV137 is designed to work with any standard 1.25\" telescope eyepiece. Its brass compression ring ensures a secure fit for eyepieces of varying weights and designs without causing damage to their barrels.\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\u003eMagnification Factor\u003c\/td\u003e\n\u003ctd\u003e2x\u003c\/td\u003e\n\u003c\/tr\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\u003eOptical Coatings\u003c\/td\u003e\n\u003ctd\u003eFully Multi-Coated (FMC)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera Threads\u003c\/td\u003e\n\u003ctd\u003eM42 x 0.75 (T-thread)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLocking Mechanism\u003c\/td\u003e\n\u003ctd\u003eBrass Compression Ring\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\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eSV137 1.25\" 2X Barlow Lens\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\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":52861235888413,"sku":"SV-W9106B","price":25.0,"currency_code":"CAD","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_759b1f1e-4174-455b-b203-80b0140b53d7.jpg?v=1788660156"},{"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":22.0,"currency_code":"CAD","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"},{"product_id":"svbony-sv216-2x-4-element-barlow-lens-125in","title":"SVBONY SV216 2X 4-Element Barlow Lens - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e2x Magnification Factor\u003c\/li\u003e\n\u003cli\u003e4-Element Optical Design\u003c\/li\u003e\n\u003cli\u003e1.25 inch Barrel Size\u003c\/li\u003e\n\u003cli\u003e3-Screw Coaxial Clamping System\u003c\/li\u003e\n\u003cli\u003eFully Multicoated Lenses\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\u003eDownloads\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 SV216 1.25\" 2X 4-Element Barlow Lens for Planetary Astronomy\u003c\/h2\u003e\n\u003cp\u003eThe SVBONY SV216 1.25\" Barlow Lens doubles your telescope's effective focal length using an advanced 4-element optical design to maintain a flat, sharp field of view. Its coaxial clamp utilizes 3 M3x10 thumbscrews for precise optical alignment, and the barrel's M28.5x0.6 threads accept standard 1.25\" filters for enhanced planetary contrast.\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\u003e4-Element Optics: A Flat Field for 2x Magnification\u003c\/h3\u003e\n\u003cp\u003eUnlike standard 2-element Barlows, the SV216 uses a 4-element lens group to deliver superior optical correction. This design significantly reduces chromatic aberration and flattens the field, ensuring stars remain sharp points even at the edge of wide-angle eyepieces. Fully multicoated surfaces on all elements maximize light transmission for bright, high-contrast views of planetary details like Jupiter's Great Red Spot or the Cassini Division in Saturn's rings.\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\u003eCoaxial Alignment: The 3-Screw Clamping Mechanism\u003c\/h3\u003e\n\u003cp\u003eThe SV216 replaces the single-screw standard with a robust 3-screw clamping system. This design allows you to apply even pressure from multiple points, forcing the eyepiece barrel to align perfectly with the Barlow's optical axis. This coaxial alignment is critical for high-magnification imaging and viewing, preventing optical tilt that can soften an entire side of the image. A brass compression ring prevents the stainless steel thumbscrews from marring your eyepiece barrels.\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\u003eSV216 4-Element vs. Standard 2-Element Barlows\u003c\/h3\u003e\n\u003cp\u003eA standard 2-element achromatic Barlow, like a Celestron Omni, is often lighter and more affordable, making it a common entry-level choice. However, the optical and mechanical design of the SVBONY SV216 provides distinct advantages for serious planetary observation and imaging.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eEdge Correction:\u003c\/strong\u003e The SV216's 4-element design provides a flatter field, crucial for keeping details sharp across the larger sensors of modern planetary cameras or when using wide-field eyepieces.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor Fidelity:\u003c\/strong\u003e By better controlling chromatic aberration, the SV216 minimizes distracting color fringing on bright targets like the lunar limb, Venus, and Jupiter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMechanical Centering:\u003c\/strong\u003e The 3-screw clamp of the SV216 offers superior optical alignment compared to the single-screw design common on most 2-element Barlows, preventing image-degrading tilt. The trade-off is weight; at 7.72oz (219g), the SV216 is substantially heavier and may require rebalancing your telescope.\u003c\/li\u003e\n\u003c\/ul\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\"\u003eWhat is the main advantage of the SVBONY SV216's 4-element design?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary advantage of the \u003cstrong\u003e4-element design\u003c\/strong\u003e is superior optical correction compared to simpler 2-element Barlows. It produces a flatter field of view, meaning stars stay sharp closer to the edge, and it significantly reduces chromatic aberration (color fringing) on bright objects.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 3-screw clamp on the SVBONY SV216 improve views?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e3-screw clamp\u003c\/strong\u003e ensures your eyepiece or camera is held perfectly on the optical axis (coaxially). A single thumbscrew can push the eyepiece slightly to one side, creating tilt that degrades sharpness, especially at high magnification. The SV216's design provides even pressure for a more precise, stable optical train.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use filters with the SVBONY SV216 Barlow?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The 1.25\" barrel is threaded with standard \u003cstrong\u003eM28.5x0.6\u003c\/strong\u003e threads, allowing you to attach any standard 1.25\" filter. This is ideal for using color filters to enhance planetary features or a UV\/IR cut filter for imaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the SVBONY SV216 work well for imaging Jupiter with my 8\" f\/10 SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. An 8\" SCT has a focal length around 2000mm. The \u003cstrong\u003eSVBONY SV216 2x Barlow\u003c\/strong\u003e will double this to 4000mm (f\/20), providing the ideal image scale for capturing fine detail in Jupiter's cloud bands with most modern planetary cameras. The flat-field 4-element design will keep the planet sharp across the entire sensor.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the SVBONY SV216 a good match for wide-angle eyepieces in my fast Dobsonian?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it's an excellent match. Fast telescopes (f\/4-f\/5) and wide-angle eyepieces are very demanding on optics. The \u003cstrong\u003eSV216's 4-element design\u003c\/strong\u003e provides the necessary correction to control aberrations like coma and astigmatism at the edge of the field, which would be amplified by a simpler Barlow.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill I need to rebalance my telescope with the SVBONY SV216?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eMost likely, yes. The SVBONY SV216 weighs \u003cstrong\u003e7.72oz (219g)\u003c\/strong\u003e, which is significantly heavier than a standard eyepiece or a lightweight Barlow. You should expect to adjust your counterweights or tube position to maintain proper balance, especially on smaller mounts.\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\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eSVBONY\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\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e1.25 inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Elements\u003c\/td\u003e\n\u003ctd\u003e4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Coatings\u003c\/td\u003e\n\u003ctd\u003eFully multicoated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Threads\u003c\/td\u003e\n\u003ctd\u003eM28.5x0.6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompression Ring\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Material\u003c\/td\u003e\n\u003ctd\u003eStainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Type\u003c\/td\u003e\n\u003ctd\u003eStraight Barrel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThumbscrews\u003c\/td\u003e\n\u003ctd\u003e3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThumbscrew Thread\u003c\/td\u003e\n\u003ctd\u003eM3x10\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInsertion Depth\u003c\/td\u003e\n\u003ctd\u003e1.55 inch \/ 39.5 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLength of Upper Body\u003c\/td\u003e\n\u003ctd\u003e2.34 inch \/ 59.5 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Diameter\u003c\/td\u003e\n\u003ctd\u003e1.73 inch \/ 44 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet Weight\u003c\/td\u003e\n\u003ctd\u003e7.72 oz \/ 219 g\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\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/svbony-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eSVBONY Warranty Policy\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SVBONY","offers":[{"title":"Default Title","offer_id":52861236805917,"sku":"SV-W9168A","price":70.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-SV216-1-25-2X-4-Element-Barlow-Lens-for-Planetary-Astronomy-1_161fcb3c-059d-402a-82aa-b9880252a975.jpg?v=1788883577"}],"url":"https:\/\/davidastro.com\/collections\/svbony-barlow-lenses.oembed","provider":"David Astro","version":"1.0","type":"link"}