{"product_id":"celestron-reducer-corrector-f-6-3-for-schmidt-cassegrain-telescopes","title":"Celestron Reducer\/Corrector f\/6.3 for Schmidt-Cassegrain Telescopes","description":"\u003ch2 id=\"product-overview\" data-lfile-container=\"d1093fe0-5198-4f0f-b169-5650ab5abad5\" data-pm-slice=\"1 1 []\"\u003eProduct overview\u003c\/h2\u003e\n\u003cp\u003eThe Celestron Reducer\/Corrector (Item #94175) is a threaded optical accessory that turns a Celestron Schmidt-Cassegrain telescope (SCT) into a dual-purpose instrument. Left off, the telescope keeps its long native focal length for high-magnification views of the Moon, planets and double stars. Threaded on, it shortens the focal length and focal ratio by about 37%, giving a faster, wider-field telescope suited to galaxies, nebulae, star clusters and astrophotography.\u003c\/p\u003e\n\u003cp\u003eIn practical terms, an f\/10 SCT becomes f\/6.3, and an f\/11 SCT (C14) becomes f\/7. The same eyepiece delivers lower magnification and a wider true field, while cameras capture a larger area of sky and need noticeably shorter exposures to reach the same signal.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2 id=\"key-features\" data-lfile-container=\"d1093fe0-5198-4f0f-b169-5650ab5abad5\" data-pm-slice=\"1 3 []\"\u003eKey features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTwo telescopes in one:\u003c\/strong\u003e switch between a long-focus planetary scope and a fast deep-sky scope in seconds.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e37% focal length reduction:\u003c\/strong\u003e f\/10 → f\/6.3; f\/11 → f\/7.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eField correction:\u003c\/strong\u003e reduces (but does not fully remove) the natural field curvature of SCT optics, giving flatter, sharper star images toward the edge of the field.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFully multi-coated optics:\u003c\/strong\u003e high light transmission with near full-field illumination.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision housing:\u003c\/strong\u003e black-anodised machined aluminium body with blackened, threaded internal surfaces to suppress stray light and maximise contrast.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKnurled grip:\u003c\/strong\u003e easy, secure threading on and off, even with gloves on cold nights.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLightweight and compact:\u003c\/strong\u003e just ~122 g, so balance on the mount barely changes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDust caps included:\u003c\/strong\u003e keep the lens clean when not in use.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 id=\"technical-specifications\" data-lfile-container=\"d1093fe0-5198-4f0f-b169-5650ab5abad5\" data-pm-slice=\"1 4 []\"\u003eTechnical specifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ccolgroup\u003e\n\u003ccol\u003e\n\u003ccol\u003e\n\u003c\/colgroup\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth colspan=\"1\" rowspan=\"1\"\u003e\n\u003cp\u003eSpecification\u003c\/p\u003e\n\u003c\/th\u003e\n\u003cth colspan=\"1\" rowspan=\"1\"\u003e\n\u003cp\u003eDetail\u003c\/p\u003e\n\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"1\" rowspan=\"1\"\u003e\n\u003cp\u003eProduct\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"1\" rowspan=\"1\"\u003e\n\u003cp\u003eCelestron Reducer\/Corrector\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"1\" rowspan=\"1\"\u003e\n\u003cp\u003eManufacturer item no.\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"1\" rowspan=\"1\"\u003e\n\u003cp\u003e94175\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"1\" rowspan=\"1\"\u003e\n\u003cp\u003eOptical function\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"1\" rowspan=\"1\"\u003e\n\u003cp\u003eFocal reducer + field corrector\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"1\" rowspan=\"1\"\u003e\n\u003cp\u003eReduction\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"1\" rowspan=\"1\"\u003e\n\u003cp\u003e0.63× (37% reduction in focal length and focal ratio)\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"1\" rowspan=\"1\"\u003e\n\u003cp\u003eResulting focal ratio\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"1\" rowspan=\"1\"\u003e\n\u003cp\u003ef\/6.3 on f\/10 SCTs; f\/7 on f\/11 SCTs\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"1\" rowspan=\"1\"\u003e\n\u003cp\u003eLens coating\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"1\" rowspan=\"1\"\u003e\n\u003cp\u003eFully multi-coated\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"1\" rowspan=\"1\"\u003e\n\u003cp\u003eHousing material\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"1\" rowspan=\"1\"\u003e\n\u003cp\u003eMachined aluminium, black anodised\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"1\" rowspan=\"1\"\u003e\n\u003cp\u003eDiameter\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"1\" rowspan=\"1\"\u003e\n\u003cp\u003e56 mm (2.2\")\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"1\" rowspan=\"1\"\u003e\n\u003cp\u003eLength\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"1\" rowspan=\"1\"\u003e\n\u003cp\u003e34 mm (1.34\")\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"1\" rowspan=\"1\"\u003e\n\u003cp\u003eWeight\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"1\" rowspan=\"1\"\u003e\n\u003cp\u003e~122 g (4.3 oz)\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"1\" rowspan=\"1\"\u003e\n\u003cp\u003eMounting\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"1\" rowspan=\"1\"\u003e\n\u003cp\u003eThreads onto the SCT rear cell (on C11\/C14, onto the reducer plate)\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"1\" rowspan=\"1\"\u003e\n\u003cp\u003eCompatible\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"1\" rowspan=\"1\"\u003e\n\u003cp\u003eCelestron SCT: C5, C6, C8, C9.25, C11, C14\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"1\" rowspan=\"1\"\u003e\n\u003cp\u003eNot compatible\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"1\" rowspan=\"1\"\u003e\n\u003cp\u003eEdgeHD tubes, Maksutov-Cassegrains, refractors, Newtonian reflectors\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2 id=\"effective-focal-length-by-telescope\" data-lfile-container=\"d1093fe0-5198-4f0f-b169-5650ab5abad5\" data-pm-slice=\"1 3 []\"\u003eEffective focal length by telescope\u003c\/h2\u003e\n\u003cp\u003eNominal figures at the 0.63× design reduction. Actual reduction varies slightly with the distance between the lens and the eyepiece or camera sensor.\u003c\/p\u003e\n\u003ctable\u003e\n\u003ccolgroup\u003e\n\u003ccol\u003e\n\u003ccol\u003e\n\u003ccol\u003e\n\u003c\/colgroup\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth colspan=\"1\" rowspan=\"1\"\u003e\n\u003cp\u003eTelescope (aperture)\u003c\/p\u003e\n\u003c\/th\u003e\n\u003cth colspan=\"1\" rowspan=\"1\"\u003e\n\u003cp\u003eNative FL \/ f-ratio\u003c\/p\u003e\n\u003c\/th\u003e\n\u003cth colspan=\"1\" rowspan=\"1\"\u003e\n\u003cp\u003eWith Reducer\/Corrector\u003c\/p\u003e\n\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"1\" rowspan=\"1\"\u003e\n\u003cp\u003eC5 (125 mm)\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"1\" rowspan=\"1\"\u003e\n\u003cp\u003e1250 mm, f\/10\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"1\" rowspan=\"1\"\u003e\n\u003cp\u003e~788 mm, f\/6.3\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"1\" rowspan=\"1\"\u003e\n\u003cp\u003eC6 (150 mm)\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"1\" rowspan=\"1\"\u003e\n\u003cp\u003e1500 mm, f\/10\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"1\" rowspan=\"1\"\u003e\n\u003cp\u003e~945 mm, f\/6.3\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"1\" rowspan=\"1\"\u003e\n\u003cp\u003eC8 (203 mm)\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"1\" rowspan=\"1\"\u003e\n\u003cp\u003e2032 mm, f\/10\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"1\" rowspan=\"1\"\u003e\n\u003cp\u003e~1280 mm, f\/6.3\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"1\" rowspan=\"1\"\u003e\n\u003cp\u003eC9.25 (235 mm)\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"1\" rowspan=\"1\"\u003e\n\u003cp\u003e2350 mm, f\/10\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"1\" rowspan=\"1\"\u003e\n\u003cp\u003e~1480 mm, f\/6.3\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"1\" rowspan=\"1\"\u003e\n\u003cp\u003eC11 (280 mm)\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"1\" rowspan=\"1\"\u003e\n\u003cp\u003e2800 mm, f\/10\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"1\" rowspan=\"1\"\u003e\n\u003cp\u003e~1764 mm, f\/6.3\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"1\" rowspan=\"1\"\u003e\n\u003cp\u003eC14 (356 mm)\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"1\" rowspan=\"1\"\u003e\n\u003cp\u003e3910 mm, f\/11\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"1\" rowspan=\"1\"\u003e\n\u003cp\u003e~2737 mm, f\/7\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eThe C5 is found in Celestron's StarSense Explorer DX 5, NexStar 5SE, Astro Fi 5 and Advanced VX C5 packages, so the reducer suits those complete telescopes too.\u003c\/p\u003e\n\u003ch2 id=\"benefits\"\u003eBenefits\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eFor visual observers\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eLower magnification and a wider field with your existing eyepieces, so large objects like the Orion Nebula, the Pleiades and Andromeda fit in view.\u003c\/li\u003e\n\u003cli\u003eEasier star-hopping and object finding thanks to the wider field.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eFor astrophotographers\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eRoughly 2.5× faster imaging than at f\/10 (exposure scales with the square of the focal ratio), cutting total integration time significantly.\u003c\/li\u003e\n\u003cli\u003eWider framing of extended deep-sky targets.\u003c\/li\u003e\n\u003cli\u003eLess sensitivity to tracking and guiding errors at the shorter focal length.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eFor daytime use\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eWorks for terrestrial digiscoping and nature photography, allowing faster shutter speeds in low light.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 id=\"installation-and-use\"\u003eInstallation and use\u003c\/h2\u003e\n\u003col\u003e\n\u003cli\u003eRemove the visual back or any accessory from the rear of the SCT.\u003c\/li\u003e\n\u003cli\u003eThread the Reducer\/Corrector onto the rear cell (C5–C9.25) or the reducer plate (C11\/C14) until snug.\u003c\/li\u003e\n\u003cli\u003eAttach your accessory to the reducer's rear thread: a 1.25\" visual back, star diagonal, T-adapter with camera T-ring, or off-axis guider.\u003c\/li\u003e\n\u003cli\u003eRefocus (focus position changes with the reducer fitted).\u003c\/li\u003e\n\u003cli\u003eReplace the dust caps when finished.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003e\u003cstrong\u003eTip:\u003c\/strong\u003e for imaging, keep the camera sensor at the spacing recommended in Celestron's documentation to get the intended f\/6.3 and the flattest field.\u003c\/p\u003e\n\u003ch2 id=\"in-the-box\"\u003eIn the box\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eCelestron Reducer\/Corrector lens\u003c\/li\u003e\n\u003cli\u003eFront and rear protective dust caps\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 id=\"recommended-accessories-cross-sell\"\u003eRecommended accessories\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eCelestron 1.25\" Visual Back\u003c\/li\u003e\n\u003cli\u003eCelestron Star Diagonal (1.25\" or 2\")\u003c\/li\u003e\n\u003cli\u003eCelestron T-Adapter for SCT + camera T-Ring (Canon \/ Nikon \/ Sony)\u003c\/li\u003e\n\u003cli\u003eCelestron Off-Axis Guider\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":43856412835901,"sku":null,"price":15000.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0623\/6595\/8205\/files\/94175_reducer_corrector_01.webp?v=1792509484","url":"https:\/\/moderntelescopes.net\/products\/celestron-reducer-corrector-f-6-3-for-schmidt-cassegrain-telescopes","provider":"Modern Telescopes","version":"1.0","type":"link"}