{"product_id":"svbony-sv230-8-20mm-super-zoom-aspheric-eyepiece-125in","title":"SVBONY SV230 8-20mm Super Zoom Aspheric Eyepiece - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e8mm to 20mm Continuous Zoom Focal Length\u003c\/li\u003e\n\u003cli\u003eParfocal Design Maintains Focus Across Zoom Range\u003c\/li\u003e\n\u003cli\u003eAspheric Optics for Edge-to-Edge Sharpness\u003c\/li\u003e\n\u003cli\u003eLong 17-19mm Eye Relief for Eyeglass Wearers\u003c\/li\u003e\n\u003cli\u003eIncludes Both 1.25\" and 2\" Barrels\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 SV230 Zoom Eyepiece Clickstop Parfocal 8-20mm\u003c\/h2\u003e\n\u003cp\u003eThe Svbony SV230 Zoom Eyepiece replaces a case of individual eyepieces with a single, parfocal 8-20mm optical system compatible with both 1.25\" and 2\" focusers. It maintains focus across its entire zoom range and provides a comfortable 17-19mm of eye relief, all in a substantial 500g body designed for serious observation.\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\u003eParfocal 8-20mm Zoom: One Eyepiece, Multiple Magnifications\u003c\/h3\u003e\n\u003cp\u003eThis eyepiece's core feature is its continuous 8mm to 20mm zoom range. You can seamlessly transition from low-power wide fields to high-power planetary detail without ever swapping eyepieces. Because the SV230 is parfocal, there's no need to refocus after changing magnification, allowing you to track moving objects or adjust for changing seeing conditions instantly.\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\u003eSharp Fields from 8mm to 20mm: Aspheric Optical Design\u003c\/h3\u003e\n\u003cp\u003eSvbony integrated aspheric lens elements and an astigmatism corrector into the SV230's design to deliver sharp, high-contrast views across the entire field. This advanced optical formula minimizes the edge distortion and field curvature often seen in conventional zoom eyepieces. The result is a clear, immersive view where stars remain tight points from the center to the field stop, regardless of the selected focal length.\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\u003eBuilt for Comfort and Compatibility: 17-19mm Eye Relief and Dual Barrels\u003c\/h3\u003e\n\u003cp\u003eWith a generous 17-19mm of eye relief, the SV230 is comfortable for all observers, including those who wear glasses. The included adapter allows the eyepiece to be used in both 1.25\" and 2\" focusers, ensuring compatibility with virtually any telescope. While its 500g weight reflects a robust optical and mechanical construction, be sure to check your focuser's capacity and your telescope's balance.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual Fit Barrels:\u003c\/strong\u003e Use the native 1.25\" barrel for smaller telescopes or attach the included 2\" adapter for larger focusers, providing maximum flexibility.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLong Eye Relief:\u003c\/strong\u003e The 17-19mm eye relief allows you to see the full field of view comfortably with or without eyeglasses, reducing eye strain during long sessions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCamera Ready:\u003c\/strong\u003e The rubber eyecup can be removed to reveal a T-mount thread, allowing for direct connection of a DSLR or mirrorless camera for afocal astrophotography (requires a separate T-adapter).\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\u003eThe 8-20mm SV230 Zoom vs. Fixed Eyepieces: Convenience and Parfocal Design\u003c\/h3\u003e\n\u003cp\u003eWhile a set of premium fixed-focal-length eyepieces might offer a wider apparent field of view at specific magnifications, they cannot match the operational simplicity of the SV230 zoom.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFixed Eyepiece Advantage:\u003c\/strong\u003e Individual eyepieces are often lighter and can be optimized for a single, wider apparent field of view.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSV230 Zoom Advantage:\u003c\/strong\u003e The SV230 offers the power of four or five eyepieces in one. Its parfocal nature eliminates constant refocusing, making it ideal for outreach events, tracking objects like the International Space Station, or for observers who value efficiency and want to minimize handling gear in the dark.\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 does 'parfocal' mean for the Svbony SV230 eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eParfocal\u003c\/strong\u003e means the eyepiece is engineered to maintain focus even when you change the magnification. Once you achieve a sharp image at 20mm, you can zoom all the way to 8mm, and the view will remain sharp with little to no adjustment needed. This is a significant convenience, especially when observing planets or the Moon.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Svbony SV230's 17-19mm eye relief enough for eyeglass wearers?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The \u003cstrong\u003e17-19mm eye relief\u003c\/strong\u003e is considered long and is specifically designed to be comfortable for observers who need to wear glasses to correct for astigmatism. You will be able to see the entire field of view without having to press your glasses against the lens.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I attach a camera to the Svbony SV230 zoom eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe SV230 features a removable rubber eyecup. Once removed, it exposes a T-mount thread underneath. To attach a camera, you will need a T-ring specific to your camera's brand (e.g., Canon, Nikon, Sony) and potentially a T-mount adapter, which are sold separately. This allows for sturdy afocal projection imaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the 500g weight of the SV230 be an issue for my telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e500g (1.1 lbs)\u003c\/strong\u003e weight is substantial due to the complex optics. For most telescopes with 2\" focusers, like Schmidt-Cassegrains or larger Dobsonians, this is not an issue. However, on smaller refractors or reflectors with 1.25\" plastic focusers, you may need to check the focuser's load capacity and rebalance the telescope tube to prevent slipping or strain.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow would I use the Svbony SV230 to observe Jupiter with my 8\" Dobsonian?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eStart at the 20mm setting (lowest power) to easily locate Jupiter in the wide field of view. Center the planet, then smoothly zoom in towards the 8mm setting. As you zoom, the image will get larger, revealing cloud bands and the Galilean moons. Because the SV230 is parfocal, you won't need to refocus, allowing you to find the perfect magnification that seeing conditions will support for the sharpest view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Svbony SV230 a good choice for viewing the Orion Nebula (M42)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. At the 20mm setting, you can frame the entire nebula, including its faint outer extensions. You can then zoom in to the 12mm or 10mm range to resolve the four stars of the Trapezium cluster at its core. The ability to adjust magnification on the fly is perfect for exploring the intricate details of large deep-sky objects like the Orion Nebula (M42).\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\u003eEye Relief\u003c\/td\u003e\n\u003ctd\u003e17-19mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet Weight\u003c\/td\u003e\n\u003ctd\u003e500g\/17.66oz\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 Warranty Policy\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SVBONY","offers":[{"title":"Default Title","offer_id":52861232218397,"sku":"SV-W9185A","price":420.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-SV230-Zoom-Eyepiece-Clickstop-Parfocal-8-20mm-1-25-2-Adapter-1_e0b583e2-79bb-4468-aab2-a6f574ea644b.jpg?v=1788883725","url":"https:\/\/davidastro.com\/fr\/products\/svbony-sv230-8-20mm-super-zoom-aspheric-eyepiece-125in","provider":"David Astro","version":"1.0","type":"link"}