{"title":"Used Diagonals","description":"","products":[{"product_id":"used-william-optics-durabright-dielectric-2-diagonal-1","title":"Used William Optics Durabright Dielectric 2\" Diagonal","description":"\u003cp\u003eThis is a used WO 2\" Durabright Dielectric diagonal, including the 1.25\" adapter.  It is in excellent condition, with clean optics and body.  Includes both dust caps, and the original box. \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp class=\"style1\"\u003eThe William Optics Dura-Bright diagonal - a dramatic step forward in the evolution of mirror diagonals!\u003c\/p\u003e\n\u003cp class=\"style1\"\u003eThis 90° 2\"mirror-type star diagonal has a Dura-Bright 12mm thick mirror and dielectric mirror coatings for 99% reflectivity which provides higher contrast and resolution during critical planetary, lunar and binary star observations.\u003c\/p\u003e\n\u003cp class=\"style1\"\u003eThe WO 2\" Dura-Bright Diagonal was designed with several unique features to provide optimum performance and years of use.\u003c\/p\u003e\n\u003cp class=\"style1\"\u003e\u003cstrong\u003eTop-Notch Performance and brightness \u003c\/strong\u003e\u003cbr\u003e• Dielectric coating allows 99% reflectivity.\u003cbr\u003e• high precision 12mm thick mirror substrate flat for optimal image stability. \u003cbr\u003e• Polished to 1\/12th wave accuracy*.\u003cbr\u003e• Accurate design guarantees constant alignment. No further alignment needed. • Threaded for 48mm Filters.\u003c\/p\u003e\n\u003cp class=\"style1\"\u003e\u003cstrong\u003eStrikingly Beautiful\u003c\/strong\u003e\u003cbr\u003e• Patented, elegant design.\u003cbr\u003e• High-quality machining out of the best aluminum.\u003cbr\u003e• Internal antireflection baffling for highest contrast. \u003cbr\u003e• Real Carbon Fiber side plates\u003c\/p\u003e\n\u003cp class=\"style1\"\u003e\u003cstrong\u003eSuperbly Constructed\u003c\/strong\u003e\u003cbr\u003e• Internal safety stop prevents 2\" barrels from hitting the mirror. \u003cbr\u003e\u003c\/p\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":48374365389059,"sku":"U2606-DZ-D-DIG2D-A2","price":125.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/files\/original-666.jpg?v=1781305691"},{"product_id":"used-1-25-dura-bright-dielectric-diagonal","title":"Brand New In Box William Optics 1.25\" Dura Bright Dielectric Diagonal","description":"\u003cp\u003e\u003cspan\u003eThis is a brand new WO 1.25\" Dura Bright Dielectric diagonal in its original box.  This was a return, but they never even opened the box, so this is in absolutely new condition.  \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis 90° 1.25\"mirror-type star diagonal has a Dura-Bright  thick mirror and dielectric mirror coatings for 99% reflectivity which provides higher contrast and resolution during critical planetary, lunar and binary star observations.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eDura-Bright features 100% real carbon fiber side plates that add that touch of class your scope deserves.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe WO 1.25\" Dura-Bright Diagonal was designed with several unique features to provide optimum performance and years of use.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eTop-Notch Performance and brightness\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eDielectric coating allows 99% reflectivity.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003ehigh precision 12mm thick mirror substrate flat for optimal image stability.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003ePolished to 1\/10th wave accuracy*.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eAccurate design guarantees constant alignment. No further alignment needed.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eMeticulous Craftsmanship\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eLock screw for eyepiece\/adapter.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eBig, knurled thumbscrews are easy to turn even with gloves on.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eThreaded for 1.25\" Filters\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eStrikingly Beautiful\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003ePatented, elegant design.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eHigh-quality machining out of the best aluminum.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eInternal antireflection baffling for highest contrast.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eReal Carbon Fiber side plates\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eSuperbly Constructed\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eCompression rings (both on diagonal and adapter) to prevent barrels from marring.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eInternal safety stop prevents 1.25\" barrels from hitting the mirror.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eDesigned for high-end scope\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eWhy W.O. diagonals do not feature an Adjustable alignment system?\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eHaving an adjustable alignment system is an admission that the diagonal can go out of collimation due to poor mechanical construction. Thanks to the patented design of WO diagonals, you will always have a as perfectly as on the first day you got it!  \u003c\/span\u003e\u003c\/p\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":48374387671299,"sku":"U2606-DZ-D-125D-C-DB","price":90.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/files\/DIG125-90-1.webp?v=1711406538"},{"product_id":"used-gso-99-dielectric-mirror-diagonal-2","title":"Used GSO 99% Dielectric Mirror Diagonal 2\"","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003eThis is a used GSO 2\" Dielectric Diagonal.  It is in excellent condition:  the mirror is clean, and the body is completely unmarked.  It comes with both dust caps, in its original box.  \u003c\/p\u003e\n\u003cp\u003e  \u003c\/p\u003e\n\u003cp\u003e  \u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e90-degree diagonal features sophisticated, lab-tested dielectric coatings that boast an astounding 99 percent reflectivity\u003c\/li\u003e\n\u003cli\u003eDielectric mirror coatings are more durable and more reflective than enhanced aluminum coatings\u003c\/li\u003e\n\u003cli\u003eDiagonal provides a comfortable 90-degree viewing orientation when observing the night sky through a refractor, Maksutov-Cassegrain (Mak-Cass) or Schmidt-Cassegrain telescope\u003c\/li\u003e\n\u003cli\u003eMachined and anodized aluminum housing features machine-threaded baffles for optimized contrast\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cspan\u003eThe GSO 2\" Dielectric Mirror Star Diagonal is an ideal choice for refractor and Cassegrain telescope users who wish to obtain the brightest views possible of the many wonders of the night sky. This high-quality mirror diagonal features sophisticated, lab-tested dielectric coatings that boast an astounding 99% reflectivity. With such high reflectivity, your views of starry skies will be bright, detailed, and full of contrast. Dielectric mirror coatings are more durable than enhanced aluminum coatings, so you'll enjoy years of exceptional performance without degradation.\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cspan\u003eThe machined and anodized aluminum diagonal housing features machine-threaded internal baffles to ensure high-contrast performance and eliminate pesky internal reflections and glare. A non-marring compression ring collar is built-in to the 1.25\" adapter to safely secure any inserted 1.25\" telescope eyepiece without scratches. Protective caps are included to keep the diagonal free of dust when not in use.\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cspan\u003eThis diagonal requires approximately 9cm inward focus travel relative to an eyepiece's focus position without the diagonal. Diagonals are not recommended for use with Newtonian reflector telescopes.\u003c\/span\u003e\u003c\/p\u003e","brand":"GSO","offers":[{"title":"Default Title","offer_id":48374460973315,"sku":"U2606-DZ-GSO99-2","price":60.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/files\/original-675.jpg?v=1781306966"},{"product_id":"used-smartastronomy-2-dielectric-diagonal","title":"Used SmartAstronomy 2\" Dielectric Diagonal","description":"\u003cp\u003eThis is a used SmartAstronomy 2\" dielectric diagonal in excellent condition! The optics are clean and the body is unmarked. This includes one dust cover, but no 1.25\" adapter or a box.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"UTF-8\"\u003e\u003cspan\u003eUse this Dielectric Diagonal to place your head in a comfortable viewing position when your refractor or catadioptric optical tube assembly (OTA) is aimed at or near the zenith. Built with a dielectric hard-coated BK-7 glass mirror, the diagonal transmits more than 99% of the incoming light to ensure clear and bright high-contrast images while maintaining maximum resolution. A brass compression ring in the eyepiece holder ensures your eyepieces won't get marked or marred when locked into place, and an internal integrated safety stop in the eyepiece holder protects the mirror and ensures a long-life.\u003c\/span\u003e\u003c\/p\u003e","brand":"SmartAstronomy","offers":[{"title":"Default Title","offer_id":48374499803395,"sku":"U2606-DZ-SA-DIAG2","price":60.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/files\/original-678.jpg?v=1781307432"},{"product_id":"used-celestron-2-mirror-star-diagonal-sct-93519-copy","title":"Used Celestron 2\" Mirror Star Diagonal, SCT (#93519)","description":"\u003cp\u003e\u003cstrong\u003eCondition\u003c\/strong\u003e:\u003c\/p\u003e\n\u003cp\u003eThis is a used Celestron 2\" Mirror Star Diagonal for SCT's in good condition with clean but dusty optics. Celestron has long since discontinued this model, so If you've ever wanted to try 2\" eyepieces on your SCT, here's your chance to do it at a discount! This does not include dust caps nor a box.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":48432454762755,"sku":"U2606-MK-93519","price":59.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/files\/original-757.jpg?v=1781739221"},{"product_id":"used-william-optics-1-25-dura-bright-dielectric-diagonal","title":"Used William Optics 1.25\" Dura Bright Dielectric Diagonal","description":"\u003cp\u003e\u003cspan\u003eThis is a used WO 1.25\" Dura Bright Dielectric diagonal in excellent condition! The optics are clean and the body is unmarked. This includes two dust covers and no box\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis 90° 1.25\"mirror-type star diagonal has a Dura-Bright  thick mirror and dielectric mirror coatings for 99% reflectivity which provides higher contrast and resolution during critical planetary, lunar and binary star observations.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eDura-Bright features 100% real carbon fiber side plates that add that touch of class your scope deserves.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe WO 1.25\" Dura-Bright Diagonal was designed with several unique features to provide optimum performance and years of use.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eTop-Notch Performance and brightness\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eDielectric coating allows 99% reflectivity.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003ehigh precision 12mm thick mirror substrate flat for optimal image stability.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003ePolished to 1\/10th wave accuracy*.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eAccurate design guarantees constant alignment. No further alignment needed.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eMeticulous Craftsmanship\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eLock screw for eyepiece\/adapter.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eBig, knurled thumbscrews are easy to turn even with gloves on.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eThreaded for 1.25\" Filters\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eStrikingly Beautiful\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003ePatented, elegant design.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eHigh-quality machining out of the best aluminum.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eInternal antireflection baffling for highest contrast.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eReal Carbon Fiber side plates\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eSuperbly Constructed\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eCompression rings (both on diagonal and adapter) to prevent barrels from marring.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eInternal safety stop prevents 1.25\" barrels from hitting the mirror.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eDesigned for high-end scope\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eWhy W.O. diagonals do not feature an Adjustable alignment system?\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eHaving an adjustable alignment system is an admission that the diagonal can go out of collimation due to poor mechanical construction. Thanks to the patented design of WO diagonals, you will always have a as perfectly as on the first day you got it!  \u003c\/span\u003e\u003c\/p\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":48435587350787,"sku":"U2606-MK-D-125D-C-DB","price":80.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/files\/original-767.jpg?v=1781813377"},{"product_id":"used-celestron-2-mirror-diagonal-with-starbright-xlt-6","title":"Used Celestron 2\" Mirror Diagonal with Starbright XLT","description":"\u003cdiv\u003e\n\u003cstrong\u003eCondition\u003c\/strong\u003e:\u003c\/div\u003e\n\u003cdiv\u003e This is a used 2\" Starbright XLT diagonal in excellent condition. The optics and body are clean and unmarked. This includes two dust caps.\u003cbr\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003chr\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003e2” SCT mirror diagonal with high performance XLT coatings\u003c\/li\u003e\n\u003cli\u003e1\/10th wave mirror is tested with an interferometer to ensure quality\u003c\/li\u003e\n\u003cli\u003eHousing is precision machined to achieve and hold good optical alignment\u003c\/li\u003e\n\u003cli\u003eIncludes a 2” to 1.25” adapter and aluminum carry case\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThere are few telescope accessories that work as hard or matter as much as a diagonal! An integral part of the optical chain, a good diagonal can make a big difference in the quality of the image you see. A 2” diagonal is required if you want to use 2” eyepieces when observing with your telescope. The larger 2” barrel allows you to see a bigger percentage of the telescope’s light cone, which works wonders for capturing faint deep sky objects with low surface brightness.\u003c\/p\u003e\n\u003cp\u003eThe Celestron 2” Mirror Diagonal was built for superior performance. The housing is machined with precision instruments to make sure the optics stay perfectly aligned. The diagonal’s mirror is tested with an interferometer, and is guaranteed to be 1\/10 wave or better. The mirror’s surface is covered with the same high performance XLT coatings used on Celestron’s best telescopes, and the result is a sharp, bright image that will satisfy the most discriminating amateur astronomer.\u003c\/p\u003e\n\u003cp\u003eTo take advantage of the XLT Diagonal’s extra light throughput, insert a 2” eyepiece into the barrel. If you want to use 1.25” eyepieces, slide the included 2” to 1.25” adapter into the eyepiece barrel and secure it with the thumbscrew. When you’re not observing, store your diagonal in the included aluminum case for protection.\u003c\/p\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":48441968296195,"sku":"U2605-XXX-93527","price":120.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/files\/original-455.jpg?v=1777757523"},{"product_id":"used-explore-scientific-2-diagonal-4","title":"Used Explore Scientific 2\" Diagonal","description":"\u003cp\u003e\u003cstrong\u003eCondition:\u003c\/strong\u003e Excellent, with a clean mirror and unmarked body.  No box, but has both dust caps and the 1.25\" adapter.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch5\u003e  \u003c\/h5\u003e\n\u003ch5\u003eFeatures\u003cbr\u003e\u003cmeta charset=\"utf-8\"\u003e\n\u003c\/h5\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eThe Explore Scientific 2-inch Dielectric-Coated Diagonal Mirror comes complete with 1.25-inch Adapter and dust covers. Solid construction and light weight, this first suface coated diagonal mirror reflects 99% of the light to help maintain the brightest possible image from your telescope.\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eThe insert barrel is a double taper, so it can be smoothly inserted or withdrawn from the focuser. The wide part of the taper prevents the diagonal from accidently falling out of the focuser if the set screw loosens up. Eyepieces are secured in the diagonal with a compression ring lock on both the two-inch eyepiece holder and the 1.25-inch eyepiece holder.\u003c\/p\u003e\n\u003cp\u003eEach 2-inch Dielectric-Coated Diagonal Mirror is serial numbered and after registration within 60 days is protected with the Explore STAR Lifetime Transferrable Warranty.\u003c\/p\u003e\n\u003cp\u003eSpecifications\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ctable width=\"100%\" height=\"250\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd width=\"28%\" bgcolor=\"#dad4d4\"\u003eDescription\u003c\/td\u003e\n\u003ctd width=\"70%\" bgcolor=\"#dad4d4\"\u003eES 2\" Dielectric-Coated Diagonal Mirror with 1.25\" Adapter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd bgcolor=\"#eeeeef\"\u003eItem Number\u003c\/td\u003e\n\u003ctd bgcolor=\"#eeeeef\"\u003e\u003cspan\u003eDD02-00CF\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd bgcolor=\"#dad4d4\"\u003eWeight\u003c\/td\u003e\n\u003ctd bgcolor=\"#dad4d4\"\u003e1.0lb; .45kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd bgcolor=\"#eeeeef\"\u003eLength\u003c\/td\u003e\n\u003ctd bgcolor=\"#eeeeef\"\u003e104.8mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd bgcolor=\"#dad4d4\"\u003eWidth\u003c\/td\u003e\n\u003ctd bgcolor=\"#dad4d4\"\u003e60.9mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd bgcolor=\"#eeeeef\"\u003eHeight\u003c\/td\u003e\n\u003ctd bgcolor=\"#eeeeef\"\u003e127.0mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":48442397393155,"sku":"U2606-DB-DD02-00CF","price":125.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/files\/2478c00b-5250-46ae-972f-c081b90bc00e.jpg?v=1781992609"},{"product_id":"open-box-dielectric-star-diagonal-2-with-twist-lock","title":"Open Box Dielectric Star Diagonal, 2” With Twist-Lock - Brand New In Box","description":"\u003cp\u003e\u003cstrong\u003eCondition\u003c\/strong\u003e:  Open box return, brand new, completely unused  - \u003cem\u003eeverything is still wrapped in its original plastic\u003c\/em\u003e.  This is a \u003cspan style=\"text-decoration: underline;\"\u003ebrand new diagonal\u003c\/span\u003e for \u003cstrong\u003eTWENTY-FIVE BUCKS\u003c\/strong\u003e less than a new one.  \u003c\/p\u003e\n\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cul\u003e\n\u003cli\u003eEnjoy better views through your telescope with this premium diagonal featuring diffraction-limited optics and dielectric coatings\u003c\/li\u003e\n\u003cli\u003eProvides a 90° viewing angle, perfect for more comfortable viewing through refractor and Cassegrain-type telescopes\u003c\/li\u003e\n\u003cli\u003e58 layers of dielectric coatings provide an over 99% reflective surface, ensuring the maximum amount of light collected by the telescope reaches the eyepiece\u003c\/li\u003e\n\u003cli\u003eTwist-lock keeps the eyepiece centered in the diagonal to provide better optical alignment\u003c\/li\u003e\n\u003cli\u003eIncludes a stepdown adapter, so the diagonal accepts eyepieces, Barlow lenses, threaded filters, and other accessories in\u003cspan\u003e \u003c\/span\u003e\u003ci\u003eboth\u003c\/i\u003e\u003cspan\u003e \u003c\/span\u003e2” and 1.25” sizes\u003c\/li\u003e\n\u003cli\u003eTwo interchangeable adapters allow you to switch between a Schmidt-Cassegrain thread adapter and a 2” barrel adapter so you can use this diagonal with a wide variety of telescopes\u003c\/li\u003e\n\u003cli\u003eEnsure maximum light transmission without loss of optical quality with the Celestron Dielectric Star Diagonal with Twist-Lock. Upgrade your existing star diagonal to this premium one and enjoy brighter, sharper images without replacing your telescope.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eEnsure maximum light transmission without loss of optical quality with the Celestron Dielectric Star Diagonal, 2” with Twist-Lock. Upgrade your existing star diagonal to this premium one and enjoy brighter, sharper images without purchasing an entirely new telescope. \u003c\/p\u003e\n\u003cp\u003eThis star diagonal reflects the telescope’s light path 90° to provide a more comfortable viewing angle. In addition, the glass has 58 layers of dielectric coatings, which provide an over 99% reflective surface, delivering the maximum amount of light to the eyepiece. This 2” star diagonal has the added benefit of allowing you to use larger 2” eyepieces with your telescope, providing a wider field of view, or standard 1.25” eyepieces with the stepdown adapter. \u003c\/p\u003e\n\u003cp\u003eThe twist-lock eyepiece holder secures eyepieces while keeping them centered in the diagonal, thus providing best opto-mechanical alignment between the telescope and eyepiece. Unlike traditional thumb screws, the twist-lock cannot scratch or engrave the barrel of your eyepieces. The diagonal has an integrated 2” barrel stop that prevents 2” accessories with long barrels from damaging the mirror. \u003c\/p\u003e\n\u003cp\u003eAll the diagonal’s mechanical parts are made of machined black anodized aluminum, except the twist lock rings, which are orange anodized for visibility. The interior of the Schmidt-Cassegrain adapter and 2” barrel are glare threaded and painted flat black to prevent glare. With all its features and these high-end finishes, the Celestron Dielectric Star Diagonal, 2” with Twist-Lock is one of the highest quality 2\" star diagonals that Celestron has ever offered.\u003c\/p\u003e\n\u003cp\u003eThis diagonal also comes with two interchangeable barrels to provide flexibility in connecting the diagonal to a wide variety of telescopes without the need for additional adapters. For telescopes, like refractors, which accept 2” barrels in their focuser, a standard 2” barrel is included. For Schmidt-Cassegrains (SCTs) that use a threaded connection to the focuser, a barrel with SCT threads is included. Both barrels thread onto the diagonal housing, providing a secure connection to the diagonal.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eStandard Star Diagonals vs Dielectric Star Diagonal\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe key specifications for a star diagonal are its reflectivity and its optical quality. This diagonal delivers top performance in both categories, with an over 99% reflective mirror and diffraction-limited optical quality. This ensures that virtually all the light collected by the telescope will reach the eyepiece without the diagonal affecting optical performance. Using a lower quality star diagonal can both dim the view and degrade optical quality. You can enjoy better views from your telescope by simply swapping out its diagonal for a premium one, like the Celestron Dielectric Star Diagonal.\u003c\/p\u003e\n\u003ch5\u003eSpecifications\u003c\/h5\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ctable id=\"product-specs-list\" class=\"table-open\"\u003e\n\u003ctbody id=\"spec-block-1\"\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiagonal size\u003c\/td\u003e\n\u003ctd\u003e50.8mm (2\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiagonal type\u003c\/td\u003e\n\u003ctd\u003eMirror\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGlass material\u003c\/td\u003e\n\u003ctd\u003eBK7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eDielectric, 58 layers\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReflectivity\u003c\/td\u003e\n\u003ctd\u003eOver 99%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical quality\u003c\/td\u003e\n\u003ctd\u003eDiffraction limited\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEyepiece holder\u003c\/td\u003e\n\u003ctd\u003e2\", Twist-Lock\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2\"-to-1.25\" Stepdown adapter\u003c\/td\u003e\n\u003ctd\u003eIncluded, Twist-Lock\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompression ring\u003c\/td\u003e\n\u003ctd\u003eYes, dual rings for 2\" eyepiece holder and single ring for 1.25\" stepdown adapter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHousing construction\u003c\/td\u003e\n\u003ctd\u003eMachined aluminum black anodized\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrels\u003c\/td\u003e\n\u003ctd\u003eComes with 2\" barrel (for connection to 2\" focusers) and SCT adapter (for connection to SCTs)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel interior\u003c\/td\u003e\n\u003ctd\u003eGlare threaded and painted flat black\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThreads for filters\u003c\/td\u003e\n\u003ctd\u003e2\" barrel and 1.25\" stepdown adapter have 2\" filter threads\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e152.4mm x 76.2mm x 101.6mm (6\" x 3\" x 4\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e19 oz (538.6 g) (with stepdown adapter)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCalifornia Residents\u003c\/td\u003e\n\u003ctd class=\"cali-prop65-warning\"\u003e\u003ca href=\"https:\/\/www.celestron.com\/products\/dielectric-star-diagonal-2-with-twist-lock#\"\u003eView Proposition 65 Warning\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":48470139666691,"sku":"U2606-XXX-93573","price":225.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/files\/93573_Twist-Lock_Dielectric_Star_Diagonal_2inch_01_570x380_2x_66c0617b-a9dc-4027-b505-ddcac15e8b83.jpg?v=1715189541"},{"product_id":"used-gso-99-dielectric-mirror-diagonal-3","title":"Used GSO 99% Dielectric Mirror Diagonal 2\"","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003eThis is a used GSO 2\" Dielectric Diagonal.  It is in excellent condition:  the mirror is clean, and the body is completely unmarked.  It includes the 1.25\" adapter, comes with both dust caps, but no box.  \u003c\/p\u003e\n\u003cp\u003e  \u003c\/p\u003e\n\u003cp\u003e  \u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e90-degree diagonal features sophisticated, lab-tested dielectric coatings that boast an astounding 99 percent reflectivity\u003c\/li\u003e\n\u003cli\u003eDielectric mirror coatings are more durable and more reflective than enhanced aluminum coatings\u003c\/li\u003e\n\u003cli\u003eDiagonal provides a comfortable 90-degree viewing orientation when observing the night sky through a refractor, Maksutov-Cassegrain (Mak-Cass) or Schmidt-Cassegrain telescope\u003c\/li\u003e\n\u003cli\u003eMachined and anodized aluminum housing features machine-threaded baffles for optimized contrast\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cspan\u003eThe GSO 2\" Dielectric Mirror Star Diagonal is an ideal choice for refractor and Cassegrain telescope users who wish to obtain the brightest views possible of the many wonders of the night sky. This high-quality mirror diagonal features sophisticated, lab-tested dielectric coatings that boast an astounding 99% reflectivity. With such high reflectivity, your views of starry skies will be bright, detailed, and full of contrast. Dielectric mirror coatings are more durable than enhanced aluminum coatings, so you'll enjoy years of exceptional performance without degradation.\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cspan\u003eThe machined and anodized aluminum diagonal housing features machine-threaded internal baffles to ensure high-contrast performance and eliminate pesky internal reflections and glare. A non-marring compression ring collar is built-in to the 1.25\" adapter to safely secure any inserted 1.25\" telescope eyepiece without scratches. Protective caps are included to keep the diagonal free of dust when not in use.\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cspan\u003eThis diagonal requires approximately 9cm inward focus travel relative to an eyepiece's focus position without the diagonal. Diagonals are not recommended for use with Newtonian reflector telescopes.\u003c\/span\u003e\u003c\/p\u003e","brand":"GSO","offers":[{"title":"Default Title","offer_id":48470742991107,"sku":"U2606-ES-GSO99-2","price":70.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/files\/d7203709-340a-4c8f-b35e-a466fa00d2a6.jpg?v=1782337905"},{"product_id":"used-tele-vue-2-diagonal-older-version","title":"Used Tele Vue 2\" Diagonal (older version)","description":"\u003cp\u003eThis is a used Tele Vue 2\" Diagonal in excellent condition. The optics are clean and the body is unmarked. This includes two dust caps and no box. This is an older version and has now been superseded by the Tele Vue Everbrite diagonal which is described below.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cdiv class=\"pageSectionTitle\"\u003e90° Everbrite Diagonals\u003c\/div\u003e\n\u003cp\u003eWhiter and brighter images. Simply put, that is the benefit the \u003ci\u003eEverbrite\u003c\/i\u003e mirror coating. This exotic, dielectric, nonmetallic coating is \u003ci\u003e99%\u003c\/i\u003e reflective across the full visual spectrum, resulting in the \"whitest,\" most natural image available. The coating is painstakingly applied to Pyrex with a surface accuracy of a 1\/10 wave flatness.\u003c\/p\u003e\n\u003cp\u003eTo ensure performance, every mirror is optically inspected under conditions far more critical than a diagonal mirror is ever used in typical telescopes. In this way, Tele Vue can guaranty that the Everbrite will permit your telescope to operate at its fullest potential.\u003c\/p\u003e\n\u003cp\u003eThe Everbrite is offered in both 1¼\" and 2\" models. The diagonal bodies of each are machined from solid blocks of aluminum. Permanent alignment is assured. The one piece body construction also means heavy accessories can't force the diagonal body to \"unscrew\" from the barrel as with other brands. Both the 1¼\" and 2\" models feature brass clamp rings, anti-reflection threads and 1¼\" and 48mm filter threads respectively.\u003c\/p\u003e","brand":"Tele Vue","offers":[{"title":"Default Title","offer_id":48494679949571,"sku":"U2606-JS-TV-DIAG","price":130.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/files\/original-783.jpg?v=1782424430"}],"url":"https:\/\/milehighastro.com\/collections\/used-diagonals.oembed","provider":"Mile High Astronomy","version":"1.0","type":"link"}