{"title":"Image correctors for telescopes and astrophotography","description":"\u003cp\u003eBrowse our Image correctors for telescopes and astrophotography collection. Hot Sale.\u003c\/p\u003e","products":[{"product_id":"starfield-adjustable-08x-universal-2-reducer-ffra-08-s","title":"Starfield Adjustable 0.8x Universal 2\" Reducer (FFRA-08-S)","description":"\u003ch1\u003eStarfield Adjustable 0.8x Universal 2\" Reducer\u003c\/h1\u003e\n\u003cp\u003e\u003cstrong\u003eSuitable for refractor telescopes from 70 to 102mm aperture with focusers of 2\".\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe Starfield 0.8x adjustable reducer and flattener makes finding the correct back focus easy! Fighting with adapters is a thing of the past! By adjusting the reducer to achieve 55mm of back focus is simple, and if more adjustment is needed for fine tuning all that is needed is a small twist. If you are using accessories such as filter wheels and rotators you can not still get the required back focus. Illumination and correction up to \u003cstrong\u003e42 mm sensor diameter\u003c\/strong\u003e - can be used up to full frame size\u003c\/p\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003eJust add up the thickness of all the accessories, plus the distance to your sensor and adjust based on the table below and then set the reducer to the number that is calculated. The reducer attaches directly to the Géar 80 \/ 90 mm telescope focuser by removing the Axil lock.\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003eUsing the supplied 1.5mm Allen key, loosen off the three screws a half turn and then unscrew the lock. Thread the reducer onto the focuser.\u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003e\u003cstrong\u003e2'' Filters can be added inside the reducer.\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003e\n\u003ch2\u003eTotal Back focuser required based on Telescope model\u003c\/h2\u003e\n \u003c\/div\u003e\n\u003cdiv\u003e102 mm \/ focal ratio f\/7 - 55 mm\u003c\/div\u003e\n\u003cdiv\u003e90 mm \/ focal ration f\/6 - 56 mm\u003c\/div\u003e\n\u003cdiv\u003e80 mm \/ focal ratio f\/7 - 57.6 mm\u003c\/div\u003e\n\u003cdiv\u003e80 mm \/ focal ratio f\/6 - 59.6 mm\u003c\/div\u003e\n\u003cdiv\u003e70 mm \/ focal ratio f\/6 - 61.6 mm\u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cdiv\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan class=\"x-el x-el-span c1-2z c1-30 c1-b c1-am c1-1j c1-1d c1-an\"\u003eTelescopic connection\u003c\/span\u003e:M63x1 external thread\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"x-el x-el-span c1-2z c1-30 c1-b c1-am c1-1j c1-1d c1-an\"\u003eCamera connection\u003c\/span\u003e:M48x0.75 external thread\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"x-el x-el-span c1-2z c1-30 c1-b c1-am c1-1j c1-1d c1-an\"\u003eReduction factor\u003c\/span\u003e:0.8 x\u003cspan class=\"x-el x-el-span c1-2z c1-30 c1-b c1-am c1-1j c1-1d c1-an\"\u003eLenses\u003c\/span\u003e:3 lenses with ED element\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"x-el x-el-span c1-2z c1-30 c1-b c1-am c1-1j c1-1d c1-an\"\u003eCoating\u003c\/span\u003e:multi-coating and internal blackening\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"x-el x-el-span c1-2z c1-30 c1-b c1-am c1-1j c1-1d c1-an\"\u003eWorking distance\u003c\/span\u003e:variable (adjustable)\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"x-el x-el-span c1-2z c1-30 c1-b c1-am c1-1j c1-1d c1-an\"\u003eAdjustment range of the distance\u003c\/span\u003e:0-17 mm stepless\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"x-el x-el-span c1-2z c1-30 c1-b c1-am c1-1j c1-1d c1-an\"\u003eSuitable for\u003c\/span\u003e:Refractor telescopes from 70 to 102 mm aperture with focusers of 2''\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAdjustable 2\" Reducer\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eAllen key\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eManual \u0026amp; Warranty\u003c\/h3\u003e\n\u003cp\u003eStarfield Limited Warranty\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Starfield","offers":[{"title":"Default Title","offer_id":52326129402157,"sku":"juy1787938050765","price":159.56,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0924\/0743\/1469\/files\/starfield-adjustable-08x-universal-2-reducer-ffra-08-s_1.webp?v=1787938055"},{"product_id":"starfield-11x-coma-corrector-cm-01","title":"Starfield 1.1x Coma Corrector (CM-01)","description":"\u003ch1\u003eStarfield 1.1x Coma Corrector\u003c\/h1\u003e\n\u003cp class=\"MsoNoSpacing\"\u003eNewtonian inherit an optical distortion called as Coma, where stars at corner appears not round but bloated like a tadpole shape. The Starfield Optics coma corrector will provide a flat field image when Use on a Newtonian telescope that works from range of F\/3-F\/6. The large 2'' corrector will provide widest field of illumination for even full frame DSLR without vignetting\u003c\/p\u003e\n\u003cp class=\"MsoNoSpacing\"\u003eThe Starfield Optics 2'' Coma Corrector will significantly enhance your visual experience as well, providing coma free view with sharp pin point stars. 2\" nosepiece features recessed safety groove and is threaded to accept standard 2\" filters\u003c\/p\u003e\n\u003cul type=\"disc\"\u003e\n\u003cli class=\"MsoNormal\"\u003e2\" eyepiece barrel features brass compression ring and dual large thumbscrews\u003c\/li\u003e\n\u003cli class=\"MsoNormal\"\u003eMagnification factor of 1.x\u003c\/li\u003e\n\u003cli class=\"MsoNormal\"\u003eFully Multicoated\u003c\/li\u003e\n\u003cli class=\"MsoNormal\"\u003e3-piece modular design (i) Optics in 2\" nosepiece with 48mm male filter thread (ii) 2' eyepiece barrel that attaches to optical nosepiece, and (iii) M48 - T2 adapter ring\u003c\/li\u003e\n\u003cli class=\"MsoNormal\"\u003eBack-focus spacing requirement is approx. 70mm +\/- 5mm from the shoulder of the 2\" nosepiece to the image plane\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"MsoNormal\"\u003eFor visual use: connect the 2\" eyepiece barrel to the main optical nosepiece\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003eFor photo use: unscrew the 2\" eyepiece barrel and attach the included M48-T2 ring to the main optical nosepiece Then attach your D\/SLR camera to the male T2 thread via a camera-specific T-ring (not included)\u003c\/p\u003e\n\u003ch3 class=\"MsoNormal\"\u003eTechnical Specifications \u003c\/h3\u003e\n\u003cul type=\"disc\"\u003e\n\u003cli class=\"MsoNormal\"\u003eFully Multi-Coated Optic\u003c\/li\u003e\n\u003cli class=\"MsoNormal\"\u003e4 elements - 2 lens groups\u003c\/li\u003e\n\u003cli class=\"MsoNormal\"\u003e50mm (2'') Barrel Fit\u003c\/li\u003e\n\u003cli class=\"MsoNormal\"\u003e43.9mm Clear Aperture\u003c\/li\u003e\n\u003cli class=\"MsoNormal\"\u003e4 Element In 2 Groups Design Corrector\u003c\/li\u003e\n\u003cli class=\"MsoNormal\"\u003eMagnification Factor 1.1x\u003c\/li\u003e\n\u003cli class=\"MsoNormal\"\u003eDesign optimized for use at f\/4.5 but will work well from f\/3 - f\/6\u003c\/li\u003e\n\u003cli class=\"MsoNormal\"\u003eInternal Edge Darkened\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"MsoNormal\"\u003e Weight:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eLower barrel with lens elements: 7.4 oz\u003c\/li\u003e\n\u003cli\u003eUpper eyepiece holder: 4.1 oz\u003c\/li\u003e\n\u003cli\u003eComplete unit for visual use: 11.8 oz\u003c\/li\u003e\n\u003cli\u003eT thread adapter: 0.3 oz\u003c\/li\u003e\n\u003cli\u003eComplete unit for photo use: 7.7 oz\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 class=\"MsoNormal\"\u003eIn the Box\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli class=\"MsoNormal\"\u003eComa Corrector\u003c\/li\u003e\n\u003cli class=\"MsoNormal\"\u003e20mm extension tube\u003c\/li\u003e\n\u003cli class=\"MsoNormal\"\u003eT2 Ring adapter\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWarranty \u0026amp; Manual\u003c\/h3\u003e\n\u003cp\u003eStarfield Limited Warranty\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e \u003c\/p\u003e","brand":"Starfield","offers":[{"title":"Default Title","offer_id":52326130057517,"sku":"fre1787938053299","price":80.94,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0924\/0743\/1469\/files\/starfield-11x-coma-corrector-cm-01_1.webp?v=1787938057"},{"product_id":"starfield-adjustable-flattener-for-80-155mm-telescopes-sf-ffa-10","title":"Starfield Adjustable Flattener for 80 - 155mm Telescopes (SF-FFA-10)","description":"\u003ch1\u003eStarfield Adjustable Flattener for 80 - 155mm Telescopes\u003c\/h1\u003e\n\u003cdiv class=\"ui-accordion-content ui-corner-bottom ui-helper-reset ui-widget-content ui-accordion-content-active\" id=\"ui-id-2\" aria-labelledby=\"ui-id-1\" role=\"tabpanel\" aria-hidden=\"false\" style=\"text-align: start;\"\u003e\n\u003cp\u003e\u003cspan\u003eThe Starfield 1.0x adjustable flattener makes finding the correct back focus easy! Fighting with adapters is a thing of the past!\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eBy setting the adjustment required for your telescope, achieving the correct amount of back focus is simple. If more adjustment is needed for fine tuning all that is needed is a small twist. If you are using accessories such as filter wheels and rotators you can not still get the required back focus. Just add up the thickness of all the accessories, plus the distance to your sensor and subtract from 69.87 and then set the reducer to the number that is calculated.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe reducer attaches directly to the Starfield telescope focusers. Using the supplied 1.5mm Allen key, loosen off the three screws a half turn and then unscrew the lock.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThread the reducer onto the focuser.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThis Flattener is designed for telescopes ranging from 80mm to 155mm\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003e80 mm \/ focal ratio f\/6 - 81.2 mm\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e90mm \/ focal ratio f\/6 - 82.5mm\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e102 mm \/ focal ratio f\/7 - 75.3 mm\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e115 mm \/ focal ratio f\/7 - 73.0 mm\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e130 mm \/ focal ratio f\/7 - 69.7 mm\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e140 mm \/ focal ratio f\/6.5 - 68.0 mm\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e155 mm \/ focal ratio f\/8 - 57.0 mm\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003eFilters can be added inside the reducer.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eTechnical Specifications\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/SF-FFA1__07764__99725.jpg?v=1741629835\u0026amp;width=700\" style=\"margin-bottom: 16px; float: none;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThis Flattener is designed for telescopes ranging from 80mm to 155mm:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003e80 mm \/ focal ratio f\/6 - 81.2 mm\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e90mm \/ focal ratio f\/6 - 82.5mm\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e102 mm \/ focal ratio f\/7 - 75.3 mm\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e115 mm \/ focal ratio f\/7 - 73.0 mm\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e130 mm \/ focal ratio f\/7 - 69.7 mm\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e140 mm \/ focal ratio f\/6.5 - 68.0 mm\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e155 mm \/ focal ratio f\/8 - 57.0 mm\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003eFilters can be added inside the reducer.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eIn the Box\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003eAdjustable Flattener Only\u003c\/p\u003e\n\u003ch3\u003eManuals \u0026amp; Warranty\u003c\/h3\u003e\n\u003cp\u003eStarfield 3-Year Optic Warranty \/ Starfield 1-Year Accessories Warranty\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Starfield","offers":[{"title":"Default Title","offer_id":52326131630381,"sku":"bcq1787938061486","price":139.11,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0924\/0743\/1469\/files\/starfield-adjustable-flattener-for-80---155mm-telescopes-sf-ffa-10_1.jpg?v=1787938068"},{"product_id":"daystar-033x-to-05x-imaging-focal-reducer-fr2dt","title":"Daystar 0.33x to 0.5x Imaging Focal Reducer (FR2DT)","description":"\u003ch1\u003eDaystar 0.33x to 0.5x Imaging Focal Reducer\u003c\/h1\u003e\n\u003cp\u003eDayStar's Imaging Focal Reducer can give you more field of view in your images. 2\" to T mount, with included T extension tube for even more reduction.\u003c\/p\u003e\n\u003cp\u003eWith a T-mount camera connected directly to the reducer, the focal length is cut in half - 0.5X. Add the 20mm extension tube for 0.33X. Even better is to combine the T-thread Interference Eliminator (sold separately) with the reducer for an interference-free 0.38X effect.\u003c\/p\u003e\n\u003cp\u003ePlease note that the obtainable field of view is usually limited by the etalon clear aperture; Quantum filters will result in a larger usable field than Quark or Ion.\u003c\/p\u003e\n\u003cp\u003eAllows full disk imaging with SR127 and 2\/3\" monochrome CCDs such as ICX625, ICX655, IMX250, IMX264.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications \u003c\/h3\u003e\n\u003ch2\u003eFocal reducer specifications\u003c\/h2\u003e\n\u003ctable style=\"width: 100.06%; height: 117.5px;\" border=\"0\" cellspacing=\"0\"\u003e\n\u003ccolgroup width=\"85\" span=\"2\"\u003e\u003c\/colgroup\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 19.5833px;\"\u003e\n\u003ctd style=\"width: 48.8888%; height: 19.5833px;\" align=\"left\" height=\"17\"\u003eLenses\u003c\/td\u003e\n\u003ctd style=\"width: 48.8888%; height: 19.5833px;\" align=\"left\"\u003eFour elements in two groups\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5833px;\"\u003e\n\u003ctd style=\"width: 48.8888%; height: 19.5833px;\" align=\"left\" height=\"17\"\u003eAperture\u003c\/td\u003e\n\u003ctd style=\"width: 48.8888%; height: 19.5833px;\" align=\"left\"\u003e36mm clear aperture.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5833px;\"\u003e\n\u003ctd style=\"width: 48.8888%; height: 19.5833px;\" align=\"left\" height=\"17\"\u003eFront\u003c\/td\u003e\n\u003ctd style=\"width: 48.8888%; height: 19.5833px;\" align=\"left\"\u003eMale 2\" eyepiece drawtube.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5833px;\"\u003e\n\u003ctd style=\"width: 48.8888%; height: 19.5833px;\" align=\"left\" height=\"17\"\u003eRear\u003c\/td\u003e\n\u003ctd style=\"width: 48.8888%; height: 19.5833px;\" align=\"left\"\u003eMale T thread (M42x0.75)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5833px;\"\u003e\n\u003ctd style=\"width: 48.8888%; height: 19.5833px;\" align=\"left\" height=\"17\"\u003eFlange to flange distance\u003c\/td\u003e\n\u003ctd style=\"width: 48.8888%; height: 19.5833px;\" align=\"left\"\u003e5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5833px;\"\u003e\n\u003ctd style=\"width: 48.8888%; height: 19.5833px;\" align=\"left\" height=\"17\"\u003eOverall length\u003c\/td\u003e\n\u003ctd style=\"width: 48.8888%; height: 19.5833px;\" align=\"left\"\u003e38mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2\u003eExtension tube specifications\u003c\/h2\u003e\n\u003ctable border=\"0\" cellspacing=\"0\"\u003e\n\u003ccolgroup width=\"107\" span=\"2\"\u003e\u003c\/colgroup\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd data-sheets-value=\"{\" align=\"left\" height=\"21\"\u003eFront\u003c\/td\u003e\n\u003ctd data-sheets-value=\"{\" align=\"left\"\u003eFemale T-thread (M42x0.75)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-sheets-value=\"{\" align=\"left\" height=\"21\"\u003eRear\u003c\/td\u003e\n\u003ctd data-sheets-value=\"{\" align=\"left\"\u003eMale T-thread (M42x0.75)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-sheets-value=\"{\" align=\"left\" height=\"21\"\u003eFlange distance\u003c\/td\u003e\n\u003ctd data-sheets-value=\"{\" align=\"left\"\u003e20mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-sheets-value=\"{\" align=\"left\" height=\"21\"\u003eOverall length\u003c\/td\u003e\n\u003ctd data-sheets-value=\"{\" align=\"left\"\u003e25mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-sheets-value=\"{\" align=\"left\" height=\"21\"\u003eBaffles\u003c\/td\u003e\n\u003ctd data-sheets-value=\"{\" for=\"\" align=\"left\"\u003eKnife edge baffles for superior contrast.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eImaging focal reducer\u003c\/li\u003e\n\u003cli\u003e20mm extension tube\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWarranty \u0026amp; Manuals\u003c\/h3\u003e\n\u003cp\u003eDaystar 5-Years Warranty\u003c\/p\u003e","brand":"Daystar","offers":[{"title":"Default Title","offer_id":52326132252973,"sku":"tjf1787938064961","price":143.09,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0924\/0743\/1469\/files\/daystar-033x-to-05x-imaging-focal-reducer-fr2dt_1.png?v=1787938071"},{"product_id":"starfield-adjustable-08x-universal-25-reducer-ffra-08-l","title":"Starfield Adjustable 0.8x Universal 2.5\" Reducer (FFRA-08-L)","description":"\u003ch1\u003eStarfield Adjustable 0.8x Universal\u003cspan\u003e \u003c\/span\u003e2.5\"\u003cspan\u003e \u003c\/span\u003eReducer\u003c\/h1\u003e\n\u003cp\u003e\u003cstrong\u003eSuitable for refractor telescopes from 102 mm to 155 mm aperture with focusers of 2.5\".\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe Starfield 0.8x adjustable reducer and flattener makes finding the correct back focus easy! Fighting with adapters is a thing of the past! By setting the adjustment to 14.87mm with the scale, achieving 55mm of back focus is simple, and if more adjustment is needed for fine tuning all that is needed is a small twist. If you are using accessories such as filter wheels and rotators you can not still get the required back focus.\u003c\/p\u003e\n\u003cdiv\u003eJust add up the thickness of all the accessories, plus the distance to your sensor and subtract from 69.87 and then set the reducer to the number that is calculated. The reducer attaches directly to the telescope focuser by removing the Axil lock.\u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003eThese reducers can be used on other manufactures telescopes as well. A M63 to 2\" push adapter might be required. Please contact us for details.\u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003eUsing a 1.5mm Allen key, loosen off the three screws a half turn and then unscrew the lock. Thread the reducer onto the focuser. This Reducer can also be used for other Telescopes lager than 102mm\u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003e\u003cstrong\u003e2'' Filters can be added inside the reducer. \u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003ch2\u003eTotal Back focuser required based on Telescope model.\u003c\/h2\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003e102 mm \/ focal ratio f\/7 - 69.87 mm\u003c\/div\u003e\n\u003cdiv\u003e107 mm \/ focal ratio f\/6.5 - 69.0 mm\u003c\/div\u003e\n\u003cdiv\u003e130 mm \/ focal ratio f\/7 - 66.17 mm\u003c\/div\u003e\n\u003cdiv\u003e140 mm \/ focal ratio f\/6.5 - 65.8 mm\u003c\/div\u003e\n\u003cdiv\u003e150 mm \/ focal ratio f\/8 - 63.34 mm\u003c\/div\u003e\n\u003cdiv\u003e155 mm \/ focal ratio f\/8 - 62.57 mm\u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cdiv\u003e\n\u003cul\u003e\n\u003cli\u003eDesign : Corrector and reducer for refractor telescopes\u003c\/li\u003e\n\u003cli\u003eTelescopic connection : M63x1 external thread\u003c\/li\u003e\n\u003cli\u003eCamera connection : M48x0.75 external thread\u003c\/li\u003e\n\u003cli\u003eReduction factor : 0.8 x\u003c\/li\u003e\n\u003cli\u003eLenses : 3 lenses with ED element\u003c\/li\u003e\n\u003cli\u003eCoating : multi-coating and internal blackening\u003c\/li\u003e\n\u003cli\u003eWorking distance : variable (adjustable) Adjustment range of the distance : 0-17 mm stepless\u003c\/li\u003e\n\u003cli\u003eSuitable for : Refractor telescopes from 102 mm to 155 mm aperture with focusers from 2.5\"\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cdiv\u003e\n\u003cul\u003e\n\u003cli\u003eAdjustable 2.5\" Reducer\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cul\u003e\n\u003cli\u003eAllen key\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003e\n\u003ch3\u003eManual \u0026amp; Warranty\u003c\/h3\u003e\n\u003cp\u003eStarfield Limited Warranty\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e","brand":"Starfield","offers":[{"title":"Default Title","offer_id":52326134972717,"sku":"ucw1787938056911","price":192.41,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0924\/0743\/1469\/files\/starfield-adjustable-08x-universal-25-reducer-ffra-08-l_1.webp?v=1787938086"},{"product_id":"askar-07x-f39-full-frame-reducer-for-fra400c-fra400c-07xr","title":"Askar 0.7x F\/3.9 Full-Frame Reducer for FRA400C (FRA400C-07XR)","description":"\u003ch1\u003eAskar 0.7x F\/3.9 Full-Frame Reducer for FRA400C\u003c\/h1\u003e\n\u003cdiv style=\"text-align: left;\"\u003e\u003cimg style=\"float: none;\" alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/FRA400C-07XR-1.jpg?v=1743625522\u0026amp;width=700\"\u003e\u003c\/div\u003e\n\u003cp\u003e\u003cspan\u003eSpecially designed for the FRA400C, this 0.7x reducer adopts a triplet lens design, it can reduce the overall focal length to 280mm and the focal ratio to F3.9 while providing a flat-field correction. When used with the reducer, the FRA400C supports full-frame imaging and the back focus is a standard 55mm.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe shorter focal ratio enables the telescope to achieve a wider field of view and faster exposure times, making it ideal for capturing large nebulae, star clusters, as well as faint and fast-moving celestial objects.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe FRA400C reducer features an M48×0.75 rear-end adapter and has a built-in 2-inch filter thread for convenient filter attachment.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/FRA400C-07XR-2.jpg?v=1743625545\u0026amp;width=700\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003eInstructions\u003c\/span\u003e\u003c\/h2\u003e\n\u003cdiv style=\"text-align: left;\"\u003e\u003cimg style=\"margin-bottom: 16px; float: none;\" alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/FRA400C-07XR-4.jpg?v=1743625601\u0026amp;width=700\"\u003e\u003c\/div\u003e\n\u003ch2\u003e\u003cspan\u003eSpot Diagram\u003c\/span\u003e\u003c\/h2\u003e\n\u003cdiv style=\"text-align: left;\"\u003e\u003cimg style=\"margin-bottom: 16px; float: none;\" alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/FRA400C-07XR-5.jpg?v=1743625577\u0026amp;width=700\"\u003e\u003c\/div\u003e\n\u003ch3\u003e\u003cspan\u003eTechnical Specifications\u003c\/span\u003e\u003c\/h3\u003e\n\u003ctable style=\"margin-left: auto; margin-right: auto;\" width=\"84.20%\" cellspacing=\"0\" align=\"center\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cstrong\u003e（After attaching）FRA400C Focal length\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"text-align: center;\" colspan=\"2\"\u003e\n\u003cp\u003e\u003cstrong\u003e280mm\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"text-align: center;\"\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003e（After attaching）FRA400C Focal ratio\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e\n\u003cp\u003e\u003cstrong\u003ef\/3.9\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"text-align: center;\"\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eLens Number\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e\n\u003cp\u003e\u003cstrong\u003eTriplet design\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"text-align: center;\"\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eBack Focus\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e\n\u003cp\u003e\u003cstrong\u003e55mm（from the base of M48 male thread）\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"text-align: center;\"\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e\n\u003cp\u003e\u003cstrong\u003e0.46kg\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"text-align: center;\"\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eRear-end thread type\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e\n\u003cp\u003e\u003cstrong\u003eM48×0.75 (M48×0.75 filter thread inside)\u003c\/strong\u003e\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\u003ch3\u003e\u003cspan\u003eIn the Box\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003e0.7x F\/3.9 Full-Frame Reducer for FRA400C\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWarranty \u0026amp; Manuals\u003c\/h3\u003e\n\u003cp\u003eAskar Warranty\u003c\/p\u003e\n\u003cp\u003eUser's Manual (EN)\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":52326138544429,"sku":"anh1787938056377","price":194.2,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0924\/0743\/1469\/files\/askar-07x-f39-full-frame-reducer-for-fra400c-fra400c-07xr_1.jpg?v=1787938109"}],"url":"https:\/\/www.northandmuse.shop\/collections\/image-correctors-for-telescopes-and-astrophotograp.oembed","provider":"My Store","version":"1.0","type":"link"}