{"product_id":"svbony-sv245-zoom-eyepiece-125in","title":"SVBONY SV245 Zoom Eyepiece - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e8mm-16mm Zoom Focal Length\u003c\/li\u003e\n\u003cli\u003eParfocal Design Remains in Focus While Zooming\u003c\/li\u003e\n\u003cli\u003eClick-Stop Mechanism for Precise Focal Length Selection\u003c\/li\u003e\n\u003cli\u003eComfortable for Eyeglass Wearers\u003c\/li\u003e\n\u003cli\u003eIncludes 2\" Interface Adapter\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\u003eZoom Eyepiece SV245\u003c\/h2\u003e\n\u003cp\u003eThe SVBONY SV245 Zoom Eyepiece covers a seamless 8mm to 16mm focal range in a single unit, designed to remain parfocal across all magnifications. Included with the eyepiece is a 2-inch interface, ensuring it fits a wide variety of telescopes.\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\u003e8mm-16mm Parfocal Zoom: Click-Stop Adjustments \u0026amp; No Refocusing\u003c\/h3\u003e\n\u003cp\u003eThis eyepiece replaces a case full of individual eyepieces by covering the critical medium-to-high power range from 8mm to 16mm. Its parfocal design means you can change magnification without needing to make major refocusing adjustments, which is critical for keeping a moving target like Jupiter or Saturn centered and sharp. The body features a click-stop mechanism with precise detents, allowing you to reliably select specific focal lengths in the dark.\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\u003eEyeglass-Friendly Design with a 2\" Interface\u003c\/h3\u003e\n\u003cp\u003eThe SV245 is built for comfort, with generous eye relief that allows observers to see the entire field of view with their glasses on. Its optics are multi-coated to improve contrast and light transmission for sharper, more vivid images. While the convenience of a zoom is unmatched, the typical trade-off is a slightly narrower apparent field of view compared to premium fixed-focal-length eyepieces. The eyepiece includes a 2\" interface adapter for use in larger focusers, adding to its compatibility with a wide range of instruments.\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 does \"parfocal\" mean for the SVBONY SV245 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 designed to maintain focus even as you change its focal length. With the SVBONY SV245, you can zoom from 16mm to 8mm, and the image will remain sharp with little to no need to adjust your telescope's focuser. This is a significant convenience, especially for tracking celestial objects.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the SVBONY SV245 zoom eyepiece comfortable to use with glasses?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The SVBONY SV245 is designed with generous eye relief, ensuring that there is enough space between the eyepiece and your eye to comfortably see the entire field of view while wearing eyeglasses. It is also compatible with common astigmatism correctors.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the benefit of the click-stop feature on the SVBONY SV245?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe click-stop mechanism provides tactile feedback as you rotate the zoom collar, with distinct \"clicks\" at marked focal lengths. This allows you to know exactly what magnification you are using without looking and makes it easy to return to a specific setting, even in complete darkness.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the SVBONY SV245 perform on the Moon with a 90mm f\/10 refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIn a 90mm f\/10 refractor (900mm focal length), the SVBONY SV245 would provide a magnification range from 56x (at 16mm) to 112.5x (at 8mm). This range is ideal for lunar observing, allowing you to frame the entire disk at 16mm and then zoom in to examine specific craters, rilles, and mountain ranges at 8mm without swapping eyepieces.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the SVBONY SV245 a good choice for splitting double stars like Albireo with an 8-inch Dobsonian?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it's an excellent choice. An 8-inch (203mm) f\/6 Dobsonian has a focal length of about 1200mm. The SVBONY SV245 would yield magnifications from 75x to 150x. This range is perfect for resolving colorful double stars like Albireo (Beta Cygni), allowing you to easily frame the pair at low power and then zoom in to cleanly separate the gold and blue components.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat size focuser does the SVBONY SV245 fit?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe SVBONY SV245 eyepiece is versatile. While it has a native barrel size (typically 1.25\"), it comes with a \u003cstrong\u003e2\" interface adapter\u003c\/strong\u003e, allowing it to be used in both standard 1.25\" and larger 2\" telescope focusers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\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\"\u003eSVBONY SV245 Zoom Eyepiece 8mm-16mm\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e2\" Lens Interface\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDust Caps\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 3\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eEyepiece Soft Bag\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\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 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SVBONY","offers":[{"title":"Default Title","offer_id":52861232251165,"sku":"SV-W9192A","price":159.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-Zoom-Eyepiece-SV245-1_1245c71e-c1b7-4478-a85b-ef6d2d8e9d7b.jpg?v=1788659853","url":"https:\/\/davidastro.com\/en-us\/products\/svbony-sv245-zoom-eyepiece-125in","provider":"David Astro","version":"1.0","type":"link"}