{"title":"Field Flat\/Reducer","description":"\u003cdiv style=\"text-align: left;\" data-mce-fragment=\"1\" data-mce-style=\"text-align: left;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0424\/5104\/2453\/files\/Field_Flatteners.jpg?v=1601497017\" alt=\"\" style=\"float: none;\" data-mce-fragment=\"1\" data-mce-style=\"float: none;\" data-mce-src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0424\/5104\/2453\/files\/Field_Flatteners.jpg?v=1601497017\"\u003e\u003c\/div\u003e","products":[{"product_id":"field-flattener-focal-reducer","title":"Field Flattener, Focal Reducer","description":"\u003cmeta charset=\"UTF-8\"\u003e\n\u003cp\u003e\u003cstrong\u003eExplore Scientific 3\" Field Flattener .7x Focal Reducer\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eOverview:\u003c\/strong\u003e\u003cbr\u003eExplore Scientific’s 3-inch Field Flattener\/0.7x Focal Reducer is a multi-faceted accessory designed to enhance your astrophotography experiences. As a field flattener, this piece addresses the edge-of-field aberrations caused by curved focal planes to ensure your night at the eyepiece will result in crisp, true images.\u003c\/p\u003e\n\u003cp\u003eAs a focal reducer, this device will reduce your f-ratio by 0.7, which results in a wider field of view, brighter images and less exposure time. Recommended for our 127mm and 152mm refracting telescopes (excluding our doublet refractors), this field flattener\/focal reducer boasts fully multi-coated optics.\u003c\/p\u003e\n\u003cp\u003eThis item comes with a threaded adapter that threads onto the Explore Scientific 2-inch rack-and-pinion focuser. Threaded attachment to a 2.5-hex focuser, which comes stock on our 127mm APO telescopes, requires purchase of an additional adapter.\u003c\/p\u003e\n\u003cp\u003eThe field flattener\/focal reducer offers 55 mm of back focus from the rear flange. The M42x0.75 adapter is 6.25 mm thick with a working length of 1.8 mm.\u003c\/p\u003e\n\u003cp\u003eWhile technically this was designed for the f\/8 system, through user experiences and our subsequent testing we have concluded that our 3-inch field flattener\/reducer performs very well with our f\/7.5 refractors.\u003c\/p\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":35603660177557,"sku":"100021299","price":479.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0424\/5104\/2453\/products\/FFFR507X-1_lg.png?v=1600137783"},{"product_id":"reducer-lens-7x-edgehd-925","title":"Reducer Lens .7x  EdgeHD 9.25","description":"\u003ch3\u003e\u003cspan\u003eReducer Lens .7x EdgeHD 925\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eOvervie\u003c\/strong\u003ew:\u003c\/span\u003e\u003cbr\u003eCelestron’s EdgeHD reducers feature a custom 4-element optical design engineered to maintain the flat-field performance of our award-winning EdgeHD optical system. Unlike generic reducers, our premium reducers provide substantial back-focus to accommodate an assortment of imaging accessories.\u003c\/p\u003e\n\u003cp\u003eEdgeHD reducers offer high-index optical elements, including extra-low dispersion, exotic Lanthanum elements, which provide high contrast viewing while minimizing chromatic aberration. All air-to-glass lens surfaces feature multiple layers of coating for maximum light transmission and color correction and contain blacken edges to minimize internal reflection and maximize image contrast. Large diameter lens elements, up to 60mm clear aperture, ensure that the optimized image circle remains at a generous 42mm for use with large CCD sensors.\u003c\/p\u003e\n\u003cp\u003eIncorporating computer assisted CNC machined aluminum housing, for precise spacing and alignment of optical elements, and threaded metal covers on the lens assembly to protect your investment from dust and scratches, our reducers offer you an outstanding mechanical design.\u003c\/p\u003e\n\u003cp\u003eWith the Fastar option on all EdgeHD optical systems, coupled with the .7x reducer, your telescope becomes the most complete imaging system available in its price range today.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePerformance\u003c\/strong\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDesign: 4-element optical layout designed specifically for the EdgeHD 9.25\" to maintain the flat-field performance of the EdgeHD optical design.\u003c\/li\u003e\n\u003cli\u003eMaintains the same back-focus as when used at f\/10: Unlike generic reducers the EdgeHD .7x provides generous back-focus to accommodate additional accessories and a wide variety of cameras. Also allows use of existing EdgeHD T-Adapters and other Celestron imaging accessories.\u003c\/li\u003e\n\u003cli\u003eOne full F-Stop faster than f\/10: Reduces the exposure time by one-half to capture the same brightness of object.\u003c\/li\u003e\n\u003cli\u003eIncrease field of view by 43%: Better for capturing wide-field images of larger galaxies and nebulae.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eGlass\u003c\/strong\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eLanthanum Glass Elements: EdgeHD reducer uses \"rare earth\" Lanthanum glass elements for clear, high contrast viewing while minimizing chromatic aberration.\u003c\/li\u003e\n\u003cli\u003eFully multi-coated lens elements: All air-to-glass surfaces have multiple layers of coating for maximum light transmission and color correction.\u003c\/li\u003e\n\u003cli\u003eBlacken edges: All lens elements have blacken edges to minimize internal reflection and maximize contrast.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eFull Frame Design\u003c\/strong\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eThreads directly onto the 3.25\" threads of the EdgeHD optical tube: Reduces mechanical vignetting and allows for use with larger (full frame) sensors and Off-Axis Guiders.\u003c\/li\u003e\n\u003cli\u003eClear aperture: 60mm clear aperture lens optimized for a 42mm image circle for use with large CCD sensors.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eMechanical Design\u003c\/strong\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eMachined aluminum housing: Computer assisted CNC machined aluminum housing for precise spacing and alignment of the optical elements.\u003c\/li\u003e\n\u003cli\u003eThreaded metal covers for both ends of the lens assembly: To protect your investment from unwanted dust and scratches.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eVersatility\u003c\/strong\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFastar compatibility and f\/2 imaging with optional accessory: the EdgeHD is the most complete imaging system in its price range.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eThe EdgeHD .7x Focal Reducer Lens makes your EdgeHD 9.25\" one full F-Stop faster than f\/10, reducing your exposure time by half to capture the same brightness of object\u003c\/li\u003e\n\u003cli\u003e4-element lens design\u003c\/li\u003e\n\u003cli\u003eMaintains similar flat-field performance as native EdgeHD optical design\u003c\/li\u003e\n\u003cli\u003eIncreases field of view by 43% to better capture wide field images\u003c\/li\u003e\n\u003cli\u003eThreads directly onto the 3.25\" threads of the EdgeHD which reduces mechanical vignetting and allows for use with larger (full frame) sensors and Off-Axis Guiders\u003c\/li\u003e\n\u003cli\u003eMaintains the identical back focus when used at f\/10 and provides generous back focus to accommodate additional accessories and wide variety of cameras\u003c\/li\u003e\n\u003cli\u003eAllows use of existing EdgeHD T-Adapters with or without the Reducer Lens\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":36336786505877,"sku":"100021809","price":429.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0424\/5104\/2453\/products\/94245-3_lg.png?v=1604006529"},{"product_id":"reducer-corrector-f-6-3","title":"Reducer \/ Corrector f\/6.3","description":"\u003ch3\u003e\u003cspan\u003eCelestron Reducer\/Corrector, f\/6.3\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eOverview:\u003c\/strong\u003e\u003cbr\u003eThis combination focal reducer and field corrector lens accessory works with all Celestron 5\", 6\", 8\", 9 1\/4\", 11\" and 14\" Schmidt-Cassegrain telescopes. This clever accessory makes it possible to have a dual focal ratio instrument, without sacrificing image quality. The Reducer\/Corrector is f\/6.3 for C5, C6, C8, C9¼ and C11 telescopes and f\/7 for the C14 telescope.\u003c\/p\u003e\n\u003cp\u003eIf offers wide fields of view with any Schmidt-Cassegrain telescope. Used for astrophotography, it reduces exposure time by a factor of 3.\u003c\/p\u003e\n\u003cp\u003eCelestron doesn’t offer a f\/6.3 Schmidt-Cassegrain telescope, because the design is impractical, with a large central obstruction, and resulting loss in contrast. This, added to the inability to utilize longer focal ratios for certain objects, led Celestron to design the four-element, fully multicoated f\/6.3 Reducer\/Corrector. Results are amazing both visually and photographically.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNOTE: \u003c\/strong\u003eThe #94175 Reducer\/Corrector Lens is not compatible with Celestron EdgeHD optical systems.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003cbr\u003e• This combination focal reducer and field corrector lens accessory works with all Celestron 5\", 6\", 8\", 9 1\/4\", 11\" and 14\" Schmidt-Cassegrain telescopes\u003cbr\u003e• This clever accessory makes it possible to have a dual focal ratio instrument, without sacrificing image quality\u003cbr\u003e• The Reducer\/Corrector is f\/6.3 for C5, C6, C8, C9¼ and C11 telescopes and f\/7 for the C14 telescope\u003c\/p\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":36336789225621,"sku":"100021814","price":189.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0424\/5104\/2453\/products\/94175-1_lg.png?v=1604006650"},{"product_id":"field-flattner-for-evoguide-50","title":"Field Flattener for EvoGuide 50ED","description":"\u003ch3\u003eSky-Watcher Field Flattener for EvoGuide 50ED\/DX APO Refractors\u003c\/h3\u003e\n\u003cp\u003e\u003cb\u003eOverview:\u003c\/b\u003e\u003cbr\u003e This field flattener by Sky-Watcher allows the EvoGiude 50ED and 50DX to be used for astrophotography by correcting for field curvature.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAPS-C field of view: 5.33 x 3.57-degrees\u003c\/li\u003e\n\u003cli\u003e17.5 mm back-focus\u003c\/li\u003e\n\u003cli\u003e28 mm imaging circle\u003c\/li\u003e\n\u003cli\u003eT-thread connection or 1.25\" opening for camera mounting\u003c\/li\u003e\n\u003cli\u003eThread-on metal caps\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SkyWatcher","offers":[{"title":"Default Title","offer_id":40474206044309,"sku":"100023048","price":109.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0424\/5104\/2453\/products\/23048_S20214-1_900.jpg?v=1625100739"},{"product_id":"reducer-lens-7x-edgehd-9-25","title":"Reducer Lens .7x  EdgeHD 1100","description":"\u003ch3\u003eReducer Lens .7x EdgeHD 1100\u003c\/h3\u003e\n\u003cp\u003e\u003cb\u003eOverview:\u003c\/b\u003e\u003cbr\u003e Celestron’s EdgeHD reducers feature a custom 5 element optical design engineered to maintain the flat-field performance of our award-winning EdgeHD optical system. Unlike generic reducers, our premium reducers provide substantial back-focus to accommodate an assortment of imaging accessories.\u003c\/p\u003e\n\u003cp\u003eEdgeHD reducers offer high-index optical elements, including extra-low dispersion, exotic Lanthanum elements, which provide high contrast viewing while minimizing chromatic aberration. All air to glass lens surfaces feature multiple layers of coating for maximum light transmission and color correction and contain blacken edges to minimize internal reflection and maximize image contrast. Large diameter lens elements, up to 60mm clear aperture, ensure that the optimized image circle remains at a generous 42mm for use with large CCD sensors.\u003c\/p\u003e\n\u003cp\u003eIncorporating computer assisted CNC machined aluminum housing, for precise spacing and alignment of optical elements, and threaded metal covers on the lens assembly to protect your investment from dust and scratches, our reducers offer you an outstanding mechanical design.\u003c\/p\u003e\n\u003cp\u003eWith the Fastar option on all EdgeHD optical systems, coupled with the .7x reducer, your telescope becomes the most complete imaging system available in its price range today.\u003c\/p\u003e\n\u003ch3\u003ePerformance\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eDesign:\u003c\/b\u003e 5-element optical layout designed specifically for the EdgeHD 11\" to maintain the flat-field performance of the EdgeHD optical design\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eMaintains the same back-focus as when used at f\/10:\u003c\/b\u003e Unlike generic reducers the EdgeHD .7x provides generous back-focus to accommodate additional accessories and a wide variety of cameras. Also allows use of existing EdgeHD T-Adapters and other Celestron imaging accessories\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eOne full F-Stop faster than f\/10:\u003c\/b\u003e Reduces the exposure time by one-half to capture the same brightness of object Increase field of view by 43%: Better for capturing wide field images of larger galaxies and nebulae\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eGlass\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eLanthanum Glass Elements:\u003c\/b\u003e EdgeHD reducer uses \"rare earth\" Lanthanum glass elements for clear, high contrast viewing while minimizing chromatic aberration\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eFully multi-coated lens elements:\u003c\/b\u003e All air-to-glass surfaces have multiple layers of coating for maximum light transmission and color correction\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eBlacken edges:\u003c\/b\u003e All lens elements have blacken edges to minimize internal reflection and maximize contrast \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFull Frame Design\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eThreads directly onto the 3.25\" threads of the EdgeHD optical tube: \u003c\/b\u003eReduces mechanical vignetting and allows for use with larger (full frame) sensors and Off-Axis Guiders\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eClear aperture:\u003c\/b\u003e 60mm clear aperture lens optimized for a 42mm image circle for use with large CCD sensors.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eMechanical Design\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eMachined aluminum housing:\u003c\/b\u003e Computer assisted CNC machined aluminum housing for precise spacing and alignment of the optical elements.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eThreaded metal covers for both ends of the lens assembly:\u003c\/b\u003e To protect your investment from unwanted dust and scratches.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eVersatility\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eFastar compatibility and f\/2 imaging with optional accessory:\u003c\/b\u003e the EdgeHD is the most complete imaging system in its price range.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eThe EdgeHD .7x Focal Reducer Lens makes your EdgeHD 1100 one full F-Stop faster than f\/10, reducing your exposure time by half to capture the same brightness of object\u003c\/li\u003e\n\u003cli\u003e5-element lens design\u003c\/li\u003e\n\u003cli\u003eMaintains similar flat-field performance as native EdgeHD optical design\u003c\/li\u003e\n\u003cli\u003eIncreases field of view by 43% to better capture wide field images\u003c\/li\u003e\n\u003cli\u003eThreads directly onto the 3.25\" threads of the EdgeHD which reduces mechanical vignetting and allows for use with larger (full frame) sensors and Off-Axis Guiders\u003c\/li\u003e\n\u003cli\u003eMaintains the identical back focus when used at f\/10 and provides generous back focus to accommodate additional accessories and wide variety of cameras\u003c\/li\u003e\n\u003cli\u003eAllows use of existing EdgeHD T-Adapters with or without the Reducer Lens\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":44215756030171,"sku":"100025492","price":839.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0424\/5104\/2453\/files\/94241-1_900.png?v=1692212359"},{"product_id":"adjustable-2-reducer-for-70-to-90mm-telescopes","title":"Adjustable 2\" Reducer for 70 to 90mm Telescopes","description":"\u003ch3\u003eAdjustable 2\" Reducer for 70 to 90mm Telescopes\u003c\/h3\u003e\n\u003ch3\u003eOverview:\u003c\/h3\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.\u003c\/p\u003e\n\u003cp\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.\u003c\/p\u003e\n\u003cp\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\/p\u003e\n\u003cp\u003eThis Reducer can also be used for other Telescopes than from 70mm to 102mm aperture\u003c\/p\u003e\n\u003cp\u003e102 mm \/ focal ratio f\/7 - 55 mm\u003cbr\u003e90 mm \/ focal ration f\/6 - 56 mm\u003cbr\u003e80 mm \/ focal ratio f\/7 - 57.6 mm\u003cbr\u003e80 mm \/ focal ratio f\/6 - 59.6 mm\u003cbr\u003e70 mm \/ focal ratio f\/6 - 61.6 mm\u003c\/p\u003e\n\u003cp\u003eFilters can be added inside the reducer.\u003c\/p\u003e\n\u003ch3\u003eTechnical Details:\u003c\/h3\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 xLenses: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)\u003c\/li\u003e\n\u003cli\u003eAdjustment 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","brand":"Starfield Optics","offers":[{"title":"Default Title","offer_id":45120144539867,"sku":"100025931","price":239.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0424\/5104\/2453\/files\/SF-FFRA-08-S-1_900.png?v=1711552320"},{"product_id":"adjustable-2-5-reducer-for-102mm-to-155mm-telescopes","title":"Adjustable 2.5\" Reducer for 102mm to 155mm telescopes","description":"\u003ch3\u003eAdjustable 2.5\" Reducer for 102mm to 155mm Telescopes\u003c\/h3\u003e\n\u003ch3\u003eOverview:\u003c\/h3\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\u003cp\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\/p\u003e\n\u003cp\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\/p\u003e\n\u003cp\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\/p\u003e\n\u003cp\u003eTotal Back focuser required based on Telescope model.\u003c\/p\u003e\n\u003cp\u003e102 mm \/ focal ratio f\/7 - 69.87 mm\u003cbr\u003e107 mm \/ focal ratio f\/6.5 - 69.0 mm\u003cbr\u003e130 mm \/ focal ratio f\/7 - 66.17 mm\u003cbr\u003e140 mm \/ focal ratio f\/6.5 - 65.8 mm\u003cbr\u003e150 mm \/ focal ratio f\/8 - 63.34 mm\u003cbr\u003e155 mm \/ focal ratio f\/8 - 62.57 mm\u003c\/p\u003e\n\u003cp\u003eFilters can be added inside the reducer.\u003c\/p\u003e\n\u003ch3\u003eTechnical Details:\u003c\/h3\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","brand":"Starfield Optics","offers":[{"title":"Default Title","offer_id":45120145686747,"sku":"100025932","price":239.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0424\/5104\/2453\/files\/SF-FFRA-08-L-1_900.png?v=1711554125"},{"product_id":"adjustable1-0x-flattener-for-70mm-155mm-telescopes","title":"Adjustable1.0x Flattener for 70mm-155mm telescopes","description":"\u003ch3\u003eAdjustable Flattener for 80 - 155mm Telescope\u003c\/h3\u003e\n\u003ch3\u003eOverview:\u003c\/h3\u003e\n\u003cp\u003eThe Starfield 1.0x adjustable flattener makes finding the correct back focus easy! Fighting with adapters is a thing of the past!\u003c\/p\u003e\n\u003cp\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\/p\u003e\n\u003ch3\u003eFeatures:\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eThe reducer attaches directly to the Starfield telescope focusers.\u003c\/li\u003e\n\u003cli\u003eUsing the supplied 1.5mm Allen key, loosen off the three screws a half turn and then unscrew the lock.\u003c\/li\u003e\n\u003cli\u003eThread the reducer onto the focuser.\u003c\/li\u003e\n\u003cli\u003eThis Flattener is designed for telescopes ranging from 80mm to 155mm.\u003c\/li\u003e\n\u003cli\u003eFilters can be added inside the reducer.\u003c\/li\u003e\n\u003cli\u003e80 mm \/ focal ratio f\/6 - 81.2 mm\u003c\/li\u003e\n\u003cli\u003e90mm \/ focal ratio f\/6 - 82.5mm\u003c\/li\u003e\n\u003cli\u003e102 mm \/ focal ratio f\/7 - 75.3 mm\u003c\/li\u003e\n\u003cli\u003e115 mm \/ focal ratio f\/7 - 73.0 mm\u003c\/li\u003e\n\u003cli\u003e130 mm \/ focal ratio f\/7 - 69.7 mm\u003c\/li\u003e\n\u003cli\u003e140 mm \/ focal ratio f\/6.5 - 68.0 mm\u003c\/li\u003e\n\u003cli\u003e155 mm \/ focal ratio f\/8 - 57.0 mm\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Starfield Optics","offers":[{"title":"Default Title","offer_id":45343484313819,"sku":"100025992","price":239.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0424\/5104\/2453\/files\/SF-FFA-10-1_900.png?v=1713371003"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0424\/5104\/2453\/collections\/21299_FFFR507X-M_lg.png?v=1596497829","url":"https:\/\/www.atlantahobby.com\/collections\/field-flattener-reducers\/skywatcher.oembed","provider":"Atlanta Hobby","version":"1.0","type":"link"}