{"product_id":"svbony-sv193-0-8x-focal-reducer-field-flattener-2in","title":"SVBONY SV193 0.8X Focal Reducer \/ Field Flattener - 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e0.8x Focal Reduction Factor\u003c\/li\u003e\n\u003cli\u003eSpecifically designed for the SVBONY SV503 102ED Telescope\u003c\/li\u003e\n\u003cli\u003eCorrects for field curvature for flat, sharp stars\u003c\/li\u003e\n\u003cli\u003e3-Element, 2-Group Optical Design\u003c\/li\u003e\n\u003cli\u003eStandard 2-inch barrel and M48x0.75 camera threads\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 SV193 2\" 0.8X Reducer Field Flattener for SV503 102ED Scope\u003c\/h2\u003e\n\u003cp\u003eThe SVBONY SV193 2\" 0.8X Reducer Field Flattener is engineered to convert the SV503 102ED refractor into a faster, wider-field imaging instrument. Its 3-element optical system simultaneously shortens exposure times and corrects for the field curvature inherent in refractor optics, producing sharp stars across the entire frame. The unit connects to your camera via standard M48*0.75 threads and, at a mere 177g, adds minimal weight to your 2-inch imaging train.\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\u003eA Faster, Wider Field at 0.8x for the SV503 102ED\u003c\/h3\u003e\n\u003cp\u003eBy reducing the telescope's native focal length by a factor of 0.8x, the SV193 significantly expands your field of view. This allows you to frame larger deep-sky targets, such as the Andromeda Galaxy (M31) or the North America Nebula (NGC 7000), that might otherwise be too large for your camera's sensor. This focal reduction also creates a faster optical system, allowing you to capture the same amount of signal in less time and reduce demands on your mount's tracking accuracy.\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\u003e3-Element Design for Edge-to-Edge Sharpness\u003c\/h3\u003e\n\u003cp\u003eThe SV193 is more than just a reducer; it is a dedicated field flattener designed to eliminate star distortion at the edges of the frame. The 3-element, 2-group optical design is fully multi-coated to maximize light transmission and contrast. Blackened lens edges further suppress internal reflections, ensuring a dark sky background and preventing stray light from degrading your final image.\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\u003eM48 Threads and 2-inch Barrel for Imaging Trains\u003c\/h3\u003e\n\u003cp\u003eIntegration with your existing equipment is seamless. The SV193 features a standard 2-inch barrel that slides directly into the SV503 102ED's focuser. On the camera side, it provides M48*0.75 male threads, the standard for connecting to DSLRs, mirrorless cameras with the appropriate T-ring, and dedicated astronomy cameras. The lightweight 177g construction ensures that it won't cause issues with focuser sag or mount balance.\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\"\u003eIs the SVBONY SV193 compatible with telescopes other than the SV503 102ED?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, the SVBONY SV193 is optically matched specifically for the SVBONY SV503 102ED refractor. While it might physically thread into other systems, the optical correction for field curvature is calculated for the specific focal length and optical properties of the SV503 102ED. Using it with other telescopes will likely result in poor edge-of-field correction.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the required back focus for the SVBONY SV193 reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eSVBONY does not officially publish a required back focus distance for the SV193. Typically, reducers of this type require 55mm of back focus from the reducer's flange to the camera sensor. You may need to experiment with M48 extension rings to achieve perfect corner-to-corner sharpness with your specific camera.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the SV193 reducer help me image the Orion Nebula (M42) with the SV503 102ED?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 0.8x focal reduction will allow you to capture the entire Orion Nebula complex, including the Running Man Nebula (NGC 1977) and the surrounding nebulosity, in a single frame with most APS-C or larger sensors. The faster focal ratio also means you can gather more signal with shorter individual exposures, which is ideal for resolving the fine details within the bright Trapezium region without overexposing it.\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 SV193 reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe SVBONY SV193 itself does not have dedicated filter threads on its telescope-facing side. To use 2-inch filters, you would typically place them in a filter drawer or filter wheel between the reducer and your camera, or thread them onto the 2-inch nosepiece of your camera if your imaging train configuration allows.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the SV193 reducer help me capture the Pleiades (M45) with an APS-C sensor on my SV503 102ED?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, absolutely. The Pleiades star cluster is a large target that can be difficult to frame with the native focal length of the SV503 102ED and an APS-C sensor. The SV193's 0.8x reduction provides a wider field of view that is perfectly suited for capturing the entire cluster, including the faint, wispy nebulosity surrounding the main stars.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the \"3-element, 2-group\" optical design of the SV193 mean for my images?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis specification describes how the lenses are constructed inside the reducer. It uses \u003cstrong\u003ethree individual lens elements\u003c\/strong\u003e arranged into \u003cstrong\u003etwo cemented groups\u003c\/strong\u003e. This multi-element design is necessary to both reduce the focal length and flatten the image field simultaneously, correcting for optical aberrations and ensuring stars are sharp points from the center to the corners of your image.\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\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e2 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera Connection\u003c\/td\u003e\n\u003ctd\u003eM48*0.75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003e3 Elements in 2 Groups\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eFully multi-coated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlackened Lens Edges\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet Weight\u003c\/td\u003e\n\u003ctd\u003e177g \/ 6.24oz \/ 0.39lb\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\u003ca href=\"https:\/\/davidastro.com\/pages\/svbony-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eSVBONY Warranty Policy\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SVBONY","offers":[{"title":"Default Title","offer_id":52861261021469,"sku":"SV-W9152D","price":83.59,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-SV193-2-0-8X-Reducer-Field-Flattener-for-SV503-102ED-Scope-1_921c9fdf-35c1-4aba-a629-bd0f413d47ca.jpg?v=1788883487","url":"https:\/\/davidastro.com\/fr-us\/products\/svbony-sv193-0-8x-focal-reducer-field-flattener-2in","provider":"David Astro","version":"1.0","type":"link"}