{"title":"SVBONY Star Diagonals","description":"\u003cp\u003eSVBONY's diagonals include the SV223 ClickLock dielectric mirror diagonals in 1.25 and 2 inches, the SV188P dielectric and SV188 mirror diagonals, the SV221 90° mirror diagonal and 45° erect-image prism, and the SV222 metal prisms in 90° erect-image and 45° correct-image versions. Part of \u003ca href=\"\/collections\/diagonals\"\u003eStar Diagonals \u0026amp; Erecting Prisms\u003c\/a\u003e.\u003c\/p\u003e","products":[{"product_id":"svbony-sv188p-1-25-dielectric-mirror-diagonal","title":"SVBONY SV188P 1.25″ 90° Dielectric Mirror Diagonal","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe SVBONY SV188P is a 1.25″ 90° star diagonal with a dielectric-coated mirror rated at 99% reflectivity. The aluminium-alloy body has a 1.25″ nosepiece with an M28.5 x 0.6 filter thread and a 1.25″ eyepiece clamp with a brass compression ring and brass thumbscrew. The mirror is 11 mm thick, and the diagonal weighs 125 g.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you observe through a refractor, Maksutov or SCT and want a comfortable viewing position for objects high in the sky, with a bright, high-reflectivity mirror in the light path.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e99% reflectivity dielectric mirror:\u003c\/strong\u003e bright images with minimal light loss.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e90° viewing angle:\u003c\/strong\u003e comfortable posture when the telescope points high.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrass compression ring and thumbscrew:\u003c\/strong\u003e holds the eyepiece securely without scratching the barrel or letting it rotate.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM28.5 x 0.6 filter thread\u003c\/strong\u003e on the nosepiece for standard 1.25″ filters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAluminium alloy body\u003c\/strong\u003e with M4 set screws.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eVisual observing\u003c\/strong\u003e of the Moon, planets, double stars and deep-sky objects.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComfortable high-altitude viewing\u003c\/strong\u003e with refractors and catadioptric telescopes.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNosepiece:\u003c\/strong\u003e 1.25″ barrel, fits any 1.25″ focuser or visual back.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEyepiece side:\u003c\/strong\u003e 1.25″ clamp.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilters:\u003c\/strong\u003e M28.5 x 0.6 thread on the nosepiece.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaksutov and SCT use:\u003c\/strong\u003e these telescopes need a 1.25″ visual back. The SVBONY MK127 includes its SCT-to-1.25″ adapter, so the SV188P slides straight in.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eImage orientation:\u003c\/strong\u003e like all mirror diagonals, the view is upright but reversed left to right, which is standard for astronomical observing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e this listing is the 1.25″ version. 2″ eyepieces need a 2″ diagonal.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. Slide the nosepiece into the focuser or visual back, tighten the set screw, and insert a 1.25″ eyepiece into the brass compression ring.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy a dielectric mirror?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eA dielectric coating reflects 99% of visible light, more than a standard aluminized mirror, which gives a slightly brighter image.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill it work on a Maksutov such as the MK127?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes, through the telescope's SCT-to-1.25″ adapter.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 1.25″ 90° diagonal with a 99% reflectivity dielectric mirror and a brass compression clamp, for bright, comfortable visual observing.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"Default Title","offer_id":67720868855919,"sku":"F9171D","price":61.55,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/f9171d-1_20251124095503_3109.webp?v=1791651491"},{"product_id":"svbony-sv223-2-clicklock-dielectric-mirror-diagonal","title":"SVBONY SV223 2″ 90° Clicklock Dielectric Mirror Diagonal","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385870419614457549257247.jpg?v=1791667835\" alt=\"SVBONY SV223 2 inch 90 degree dielectric mirror diagonal\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe SVBONY SV223 2″ is a 90° mirror star diagonal with a dielectric-coated mirror rated at more than 99% reflectivity and 1\/10λ flatness on an 11.5 mm thick substrate. A Clicklock clamp holds 2″ eyepieces and accessories, a 2″-to-1.25″ adapter is included, and the telescope-side barrel carries an M48 x 0.75 filter thread. Clear aperture is 43 mm, optical length is approximately 109.1 mm, and it weighs 573.7 g.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385870426108640766781949.jpg?v=1791667835\" alt=\"SVBONY SV223 2 inch 90 degree viewing angle\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you observe through a refractor, SCT or Maksutov with a 2″ focuser or visual back and want a comfortable viewing angle, a secure grip on heavy 2″ eyepieces, and the option to use 1.25″ eyepieces through the same diagonal.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDielectric mirror, \u0026gt;99% reflectivity:\u003c\/strong\u003e 1\/10λ flatness on an 11.5 mm thick substrate for a stable, flat reflecting surface.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClicklock clamp:\u003c\/strong\u003e a twist-to-lock clamp that centres and holds 2″ eyepieces or accessories quickly and securely.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e43 mm clear aperture:\u003c\/strong\u003e passes the full field of wide 2″ eyepieces.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompression rings:\u003c\/strong\u003e stainless steel compression rings on both the diagonal and the adapter help prevent barrels from marring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM48 x 0.75 filter thread:\u003c\/strong\u003e on the telescope-side barrel for 2″ filters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMetal construction:\u003c\/strong\u003e 573.7 g.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385870421862665058543660.jpg?v=1791667835\" alt=\"SVBONY SV223 2 inch Clicklock locking mechanism\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385870423083016402927862.jpg?v=1791667835\" alt=\"SVBONY SV223 2 inch high-reflectivity dielectric mirror\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385870425031691949714654.jpg?v=1791667835\" alt=\"SVBONY SV223 2 inch compression ring\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eVisual observing\u003c\/strong\u003e with refractors and catadioptric telescopes, from wide-field deep-sky sweeps to high-power planetary views.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeavy 2″ eyepieces\u003c\/strong\u003e and zoom eyepieces that benefit from a secure clamp.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMixed eyepiece collections\u003c\/strong\u003e, using the included 2″-to-1.25″ adapter.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385870427886372636544287.jpg?v=1791667835\" alt=\"SVBONY SV223 2 inch before and after use comparison\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTelescope side:\u003c\/strong\u003e 2″ barrel, fits 2″ focusers and visual backs; M48 x 0.75 thread for 2″ filters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEyepiece side:\u003c\/strong\u003e 2″ Clicklock clamp; 1.25″ eyepieces fit with the included adapter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptical length:\u003c\/strong\u003e approximately 109.1 mm, worth accounting for when reaching focus on refractors with limited inward travel.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385870428911309512628163.jpg?v=1791667835\" alt=\"SVBONY SV223 2 inch diagonal with 1.25 inch adapter\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWhat's in the Box\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eSV223 2″ 90° Clicklock dielectric diagonal\u003c\/li\u003e\n\u003cli\u003e2″ to 1.25″ adapter\u003c\/li\u003e\n\u003cli\u003eM4 screw (1)\u003c\/li\u003e\n\u003cli\u003eDust cap (1)\u003c\/li\u003e\n\u003cli\u003eDust plug (1)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eImage orientation:\u003c\/strong\u003e the view is upright but mirror-reversed left to right, as with any single-mirror diagonal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVisual use:\u003c\/strong\u003e a diagonal is for eyepiece observing; imaging cameras usually attach straight-through.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLight path:\u003c\/strong\u003e the 109.1 mm optical length adds to the focus position. If you are unsure whether your telescope reaches focus with a 2″ diagonal, send us the model and we will check it with you.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. Insert the 2″ barrel into your focuser or visual back, then insert an eyepiece and twist the Clicklock ring to lock it.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use 1.25″ eyepieces?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes. The included 2″-to-1.25″ adapter fits into the Clicklock clamp.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it take filters?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes. 2″ filters thread onto the M48 x 0.75 telescope-side barrel, so one filter serves every eyepiece.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy a dielectric mirror?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eDielectric coatings reflect more than 99% of the light and are more durable than standard aluminium coatings.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 2″ 90° dielectric mirror diagonal with \u0026gt;99% reflectivity, a Clicklock eyepiece clamp, a 43 mm clear aperture and a 1.25″ adapter included.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"Default Title","offer_id":67721428828271,"sku":"W9180B","price":153.89,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9180b-1_20250807165619_0071.jpg?v=1791665258"},{"product_id":"svbony-sv223-1-25-clicklock-dielectric-mirror-diagonal","title":"SVBONY SV223 1.25″ 90° Clicklock Dielectric Mirror Diagonal","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387029085378776593191571.jpg?v=1791667841\" alt=\"SVBONY SV223 1.25 inch 90 degree dielectric mirror diagonal\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe SVBONY SV223 1.25″ is a 90° mirror star diagonal with a dielectric-coated mirror rated at more than 99% reflectivity and 1\/10λ flatness on an 11.5 mm thick substrate. A Clicklock clamp holds 1.25″ eyepieces, an internal safety stop keeps barrels off the mirror, and the telescope-side barrel carries an M28.5 x 0.6 filter thread. Clear aperture is 25 mm, optical length is approximately 85.5 mm, and it weighs 249 g.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387028351111713731031816.jpg?v=1791667841\" alt=\"SVBONY SV223 1.25 inch diagonal setup on a telescope\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you observe through a refractor, SCT or Maksutov with a 1.25″ eyepiece holder and want a comfortable viewing angle with a quick, secure eyepiece clamp.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDielectric mirror, \u0026gt;99% reflectivity:\u003c\/strong\u003e 1\/10λ flatness on an 11.5 mm thick optical flat.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClicklock clamp:\u003c\/strong\u003e a twist-to-lock clamp for fast, centred eyepiece changes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInternal safety stop:\u003c\/strong\u003e prevents eyepiece barrels from reaching the mirror.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStainless steel compression ring:\u003c\/strong\u003e helps prevent barrels from marring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMachined aluminium body:\u003c\/strong\u003e with internal anti-reflection baffling for contrast.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM28.5 x 0.6 filter thread:\u003c\/strong\u003e on the telescope-side barrel for 1.25″ filters.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387037600071560638482077.jpg?v=1791667841\" alt=\"SVBONY SV223 1.25 inch Clicklock locking mechanism\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387029116771902277125595.jpg?v=1791667841\" alt=\"SVBONY SV223 1.25 inch 99 percent reflectivity mirror\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eVisual observing\u003c\/strong\u003e with refractors and catadioptric telescopes that take 1.25″ accessories.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlanetary and lunar sessions\u003c\/strong\u003e where frequent eyepiece changes benefit from the Clicklock clamp.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompact and travel setups\u003c\/strong\u003e where a 249 g diagonal keeps the load down.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387056485272951833429777.jpg?v=1791667841\" alt=\"SVBONY SV223 1.25 inch before and after use comparison\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387038822142679885738236.jpg?v=1791667841\" alt=\"SVBONY SV223 1.25 inch diagonal suitable for many telescopes\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTelescope side:\u003c\/strong\u003e 1.25″ barrel, fits 1.25″ focusers and eyepiece holders; M28.5 x 0.6 thread for 1.25″ filters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEyepiece side:\u003c\/strong\u003e 1.25″ Clicklock clamp.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptical length:\u003c\/strong\u003e approximately 85.5 mm.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6382735804362481463706283.jpg?v=1791665293\" alt=\"SVBONY SV223 1.25″ Clicklock diagonal connection to a telescope\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387056354374049444298003.jpg?v=1791667841\" alt=\"SVBONY SV223 1.25 inch diagonal connection to a telescope\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387056542247450609504711.jpg?v=1791667842\" alt=\"SVBONY SV223 1.25 inch diagonal in use with an eyepiece\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWhat's in the Box\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eSV223 1.25″ 90° Clicklock dielectric diagonal\u003c\/li\u003e\n\u003cli\u003eM4 screw (1)\u003c\/li\u003e\n\u003cli\u003eDust cap (1)\u003c\/li\u003e\n\u003cli\u003eDust plug (1)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eImage orientation:\u003c\/strong\u003e the view is upright but mirror-reversed left to right, as with any single-mirror diagonal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.25″ only:\u003c\/strong\u003e 2″ eyepieces need the 2″ version of the SV223.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVisual use:\u003c\/strong\u003e a diagonal is for eyepiece observing; imaging cameras usually attach straight-through.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. Insert the barrel into your focuser or eyepiece holder, then insert an eyepiece and twist the Clicklock ring to lock it.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it take filters?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes. 1.25″ filters thread onto the M28.5 x 0.6 telescope-side barrel, so one filter serves every eyepiece.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy a dielectric mirror?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eDielectric coatings reflect more than 99% of the light and are more durable than standard aluminium coatings.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill it fit an SCT or Maksutov?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes, on any telescope that accepts a 1.25″ barrel, including through an SCT-to-1.25″ visual back.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 1.25″ 90° dielectric mirror diagonal with \u0026gt;99% reflectivity, a Clicklock eyepiece clamp and an internal safety stop, at 249 g.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"Default Title","offer_id":67721430007919,"sku":"W9180A","price":132.23,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9180a_20250806142557_5256.jpg?v=1791665282"},{"product_id":"svbony-sv188-1-25-mirror-diagonal","title":"SVBONY SV188 1.25″ 90° Mirror Diagonal for Refractors","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6371934719254349607262056.jpg?v=1791669914\" alt=\"SVBONY SV188 1.25 inch 90 degree mirror diagonal key visual\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe SVBONY SV188 is a 1.25″ 90° mirror star diagonal for refractors. It turns the light path through a right angle so the eyepiece sits at a comfortable position when you observe high in the sky. The mirror has a published reflectivity of 90%, the housing is metal, and a single thumbscrew holds 1.25″ eyepieces. The nosepiece fits 1.25″ focusers directly and 2″ focusers with an adapter.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you observe visually with a refractor that takes 1.25″ eyepieces and want an upright-angle viewing position for the Moon, planets and deep-sky objects, or if you need a replacement for a lost or damaged diagonal.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e90° mirror diagonal:\u003c\/strong\u003e places the eyepiece at a right angle to the tube for comfortable viewing near the zenith.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e90% reflectivity:\u003c\/strong\u003e the published reflectance of the mirror coating.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision-machined alignment:\u003c\/strong\u003e SVBONY machines the mirror seat to hold optical alignment.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBlackened internal threads:\u003c\/strong\u003e threaded baffling inside the barrel reduces glare and stray reflections.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMetal housing\u003c\/strong\u003e with a single-screw 1.25″ eyepiece clamp.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6371934719246909342776934.jpg?v=1791669913\" alt=\"SVBONY SV188 mirror diagonal precision-aligned mirror detail\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6371934717356889712318365.jpg?v=1791669913\" alt=\"SVBONY SV188 mirror diagonal blackened internal threads detail\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLunar and planetary observing\u003c\/strong\u003e with a 1.25″ eyepiece set on a refractor.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDeep-sky viewing near the zenith\u003c\/strong\u003e, where a straight-through view is awkward.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplacement diagonal\u003c\/strong\u003e for entry-level and travel refractors.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6373085363400990158429545.jpg?v=1791669914\" alt=\"SVBONY SV188 mirror diagonal on a refractor\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eEyepiece side:\u003c\/strong\u003e 1.25″, one clamping screw.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTelescope side:\u003c\/strong\u003e 1.25″ nosepiece; 2″ focusers need a 2″-to-1.25″ adapter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTelescope type:\u003c\/strong\u003e designed for refractors. SVBONY names refractors such as Celestron EQ and Meade Infinity models as examples.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot for Newtonians:\u003c\/strong\u003e a Newtonian's focal plane sits too close to the focuser for a diagonal to reach focus.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6373085365203498263994258.jpg?v=1791669914\" alt=\"SVBONY SV188 mirror diagonal eyepiece clamp and nosepiece\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMirror-reversed image:\u003c\/strong\u003e like all 90° mirror diagonals, it shows an upright image that is reversed left to right. For a fully correct image, an erecting prism diagonal is the alternative.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRefractors (and similar) only:\u003c\/strong\u003e it is not suitable for Newtonian reflectors.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e SVBONY does not publish a weight for this diagonal.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. It slides into the 1.25″ focuser and the eyepiece slides into the diagonal, each held by a thumbscrew.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill it work in my 2″ focuser?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes, with a 2″-to-1.25″ adapter in the focuser.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use it on a Newtonian?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. SVBONY lists it as not suitable for Newtonians.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the image orientation?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eUpright but mirror-reversed left to right, as with any single-mirror diagonal.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 1.25″ 90° metal-bodied mirror diagonal with 90% reflectivity and blackened internal threads, for comfortable visual observing with a refractor.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"Default Title","offer_id":67722222076015,"sku":"F9171A","price":34.19,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/f9171a---9-_20250806105250_4152_20260810154813_1315.webp?v=1791670090"},{"product_id":"svbony-sv221-1-25-45-degree-erect-prism-diagonal","title":"SVBONY SV221 1.25″ 45° Erect-Image Prism Diagonal","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6382466889884136253897484.jpg?v=1791669977\" alt=\"SVBONY SV221 1.25 inch 45 degree correct image prism diagonal key visual\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe SVBONY SV221 is a 1.25″ prism diagonal that turns the light path through 45° and delivers an erect, non-reversed image – right-side-up and correct left-to-right. It has a 19 mm clear aperture, a multi-coated prism and an optical length of about 86 mm. The housing combines ABS with aluminium end barrels, the nosepiece carries an M28.5 x 0.6 filter thread, the eyepiece holder clamps by screw with a brass compression ring, and the diagonal weighs 79 g (2.78 oz).\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you use a refractor or a Maksutov or Schmidt-Cassegrain for both daytime terrestrial viewing and night-sky observing and want an image that matches what you see with your eyes, at a comfortable 45° viewing angle.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385726473051115629530435.jpg?v=1791669978\" alt=\"SVBONY SV221 45 degree diagonal 1.25 inch barrel and eyepiece holder\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eErect, non-reversed image:\u003c\/strong\u003e correct orientation for terrestrial targets and easier star-hopping with a printed chart.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e45° deflection:\u003c\/strong\u003e a natural angle for viewing objects low on the horizon and land targets.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMulti-coated prism:\u003c\/strong\u003e SVBONY specifies higher light transmission.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilter thread:\u003c\/strong\u003e M28.5 x 0.6 inside the nosepiece for 1.25″ filters, with internal blackening.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrass compression ring:\u003c\/strong\u003e brass locking screws and ring protect eyepiece and barrel finishes.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385726475849621144304119.jpg?v=1791669977\" alt=\"SVBONY SV221 45 degree diagonal aluminium barrels and coated prism\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385726477847577129682512.jpg?v=1791669977\" alt=\"SVBONY SV221 45 degree diagonal 1.25 inch filter thread\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385726479343277608978085.jpg?v=1791669977\" alt=\"SVBONY SV221 45 degree diagonal brass compression ring\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLunar and planetary observing\u003c\/strong\u003e, which SVBONY lists as its main night-sky use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTerrestrial viewing and birding\u003c\/strong\u003e through a small refractor.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePublic outreach and casual sessions\u003c\/strong\u003e, where an upright image is easier for everyone at the eyepiece.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385726481941620816678671.jpg?v=1791669978\" alt=\"SVBONY SV221 45 degree diagonal for Moon and planet viewing\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTelescopes:\u003c\/strong\u003e refractors and catadioptrics such as Schmidt-Cassegrain and Maksutov-Cassegrain telescopes with a 1.25″ visual back.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEyepieces:\u003c\/strong\u003e any 1.25″ eyepiece.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilters:\u003c\/strong\u003e M28.5 x 0.6 thread on the nosepiece.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNewtonians and Dobsonians:\u003c\/strong\u003e these do not use a diagonal, and SVBONY does not recommend the SV221 for them.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eWhat's in the Box\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e1 x SV221 1.25″ 45° correct-image prism diagonal\u003c\/li\u003e\n\u003cli\u003e3 x M3 screws\u003c\/li\u003e\n\u003cli\u003e1 x dust cap\u003c\/li\u003e\n\u003cli\u003e1 x dust plug\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385726483057733706721669.jpg?v=1791669977\" alt=\"SVBONY SV221 45 degree diagonal package contents\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.25″ only:\u003c\/strong\u003e the barrel and eyepiece holder take 1.25″ accessories.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptical length about 86 mm:\u003c\/strong\u003e if your telescope has limited inward focus travel, send us the model and we will confirm it reaches focus with this diagonal.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. It slides into the telescope's 1.25″ focuser or visual back and the eyepiece locks into it with the thumbscrew.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does erect image mean?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe view is right-side-up and not mirror-reversed, the same orientation you see with your eyes.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use it at night?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes. SVBONY lists it for Moon and planet viewing, alongside daytime targets.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill it work on my Newtonian?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNewtonian and Dobsonian telescopes do not use a diagonal, so it is not intended for them.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 79 g, 1.25″ 45° prism diagonal with an erect, non-reversed image and filter threads for refractors and catadioptric telescopes used both day and night.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"Default Title","offer_id":67722333716591,"sku":"W9178B","price":25.07,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9178b_20250806143657_4091_20260810135616_0538.webp?v=1791670572"},{"product_id":"svbony-sv221-1-25-90-degree-mirror-diagonal","title":"SVBONY SV221 1.25″ 90° Mirror Diagonal","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385741516607160316958546.jpg?v=1791669981\" alt=\"SVBONY SV221 1.25 inch 90 degree mirror diagonal key visual\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe SVBONY SV221 90° is a 1.25″ mirror star diagonal that turns the light path through a right angle so you can look down into the eyepiece rather than crouching behind the telescope. The aluminium-coated mirror has a reflectivity above 92% and a clear aperture of 29.5 mm, the optical length is about 73 mm, and the diagonal weighs 90.5 g (3.19 oz). The nosepiece carries an M28.5 x 0.6 filter thread, and the eyepiece holder uses a brass pressure ring and screw clamp.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you observe with a refractor, Maksutov-Cassegrain or Schmidt-Cassegrain and want a light, inexpensive 1.25″ diagonal for comfortable viewing near the zenith, or a spare diagonal for a travel or grab-and-go telescope.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e90° right-angle design:\u003c\/strong\u003e comfortable viewing posture, especially for objects high in the sky.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAluminium-coated mirror:\u003c\/strong\u003e reflectivity above 92%.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e29.5 mm clear aperture:\u003c\/strong\u003e full illumination for 1.25″ eyepieces.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrass pressure ring:\u003c\/strong\u003e holds the eyepiece without the screw touching its barrel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLight construction:\u003c\/strong\u003e ABS housing with aluminium barrels, brass lock screws and a dust cover; 90.5 g in total.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385741519395048632772069.jpg?v=1791669981\" alt=\"SVBONY SV221 90 degree diagonal aluminium die structure\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385741521399283119833394.jpg?v=1791669981\" alt=\"SVBONY SV221 90 degree diagonal brass pressure ring\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLunar, planetary and deep-sky observing\u003c\/strong\u003e with 1.25″ eyepieces.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComfortable viewing near the zenith\u003c\/strong\u003e on refractors and catadioptrics.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCasual daytime viewing and birding,\u003c\/strong\u003e keeping in mind the mirror-reversed image described below.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTelescopes:\u003c\/strong\u003e refractors and catadioptrics such as Schmidt-Cassegrain and Maksutov-Cassegrain telescopes with a 1.25″ focuser or visual back.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEyepieces:\u003c\/strong\u003e any 1.25″ eyepiece.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilters:\u003c\/strong\u003e M28.5 x 0.6 thread on the nosepiece.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImage orientation:\u003c\/strong\u003e upright but mirror-reversed left to right, as with any single-mirror diagonal. The SV221 45° prism version gives a fully correct image if you need one for land viewing.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385741525434271981431665.jpg?v=1791669982\" alt=\"SVBONY SV221 mirror diagonal image orientation versus normal image\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWhat's in the Box\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e1 x SV221 1.25″ 90° mirror diagonal\u003c\/li\u003e\n\u003cli\u003e3 x M3 screws\u003c\/li\u003e\n\u003cli\u003e1 x dust cap\u003c\/li\u003e\n\u003cli\u003e1 x dust plug\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385741529117361807069902.jpg?v=1791669982\" alt=\"SVBONY SV221 90 degree diagonal package contents\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMirror-reversed image:\u003c\/strong\u003e normal for astronomy; for land viewing an erect-image prism diagonal gives a correct view.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNewtonians and Dobsonians:\u003c\/strong\u003e these telescopes do not use a diagonal, and SVBONY does not recommend the SV221 for them.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. It slides into the 1.25″ focuser or visual back, and the eyepiece locks into it with the thumbscrew and brass ring.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it reverse the image?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe image is upright but reversed left to right, which is standard for a mirror diagonal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I add filters?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes. 1.25″ filters thread into the M28.5 x 0.6 nosepiece.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill it fit my telescope?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eIt fits any refractor or catadioptric with a 1.25″ focuser or visual back.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a light 1.25″ 90° mirror diagonal with a 29.5 mm aperture, over 92% reflectivity, a brass compression ring and filter threads for refractors and catadioptric telescopes.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"Default Title","offer_id":67722340171887,"sku":"W9178A","price":21.36,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9178a_20250806150235_2192_20260810144007_6755.webp?v=1791670612"},{"product_id":"svbony-sv222-1-25-45-degree-correct-image-prism-diagonal","title":"SVBONY SV222 1.25″ 45° Correct-Image Prism Diagonal (Metal, FMC)","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385871100284965108869339.jpg?v=1791669990\" alt=\"SVBONY SV222 1.25 inch 45 degree correct image prism diagonal key visual\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe SVBONY SV222 45° is a 1.25″ correct-image prism diagonal that gives an erect, non-reversed view at a 45° angle. The BK7 prism is fully multi-coated and phase-coated for contrast, the body is CNC-machined aluminium with black anodizing, and the interior is baffled and matte-blackened against stray light. Clear aperture is 16 mm, optical length about 93 mm, the nosepiece carries an M28.5 x 0.6 filter thread, and the diagonal weighs 167 g (5.87 oz).\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you use a refractor for both terrestrial and astronomical viewing and want a metal-bodied correct-image diagonal with phase-coated optics, for example for birding by day and lunar or planetary observing at night.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e45° upright BK7 prism:\u003c\/strong\u003e correct daytime orientation, right-side-up and non-reversed.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFully multi-coated plus phase coating:\u003c\/strong\u003e SVBONY specifies high contrast and a bright, clear image.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCNC aluminium body:\u003c\/strong\u003e black anodized for durability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBaffled and matte interior:\u003c\/strong\u003e blackened, baffled light path to suppress internal reflections.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrass pressure ring and large chrome thumbscrew:\u003c\/strong\u003e holds the eyepiece firmly without marking it, and is easy to operate with gloves.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385871102103575103074282.jpg?v=1791669991\" alt=\"SVBONY SV222 45 degree upright prism with multi-layer and phase coating\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385871103196903979882276.jpg?v=1791669991\" alt=\"SVBONY SV222 45 degree diagonal anodized aluminium body\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385871104260814206315319.jpg?v=1791669991\" alt=\"SVBONY SV222 45 degree diagonal internal baffle design\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eOptical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eA correct-image diagonal uses a roof-type prism to invert and revert the image in the same element that turns the light path, so what you see matches the scene in front of you. Phase coatings on the prism's roof faces counter the phase shift that otherwise softens contrast in roof prisms. The internal baffle and matting keep off-axis light out of the eyepiece.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385871105292205474943389.jpg?v=1791669991\" alt=\"SVBONY SV222 45 degree diagonal matte black interior\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385871107970602847855953.jpg?v=1791669991\" alt=\"SVBONY SV222 45 degree diagonal brass pressure ring\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385871108974335366715892.jpg?v=1791669991\" alt=\"SVBONY SV222 45 degree diagonal large chrome thumbscrew\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTerrestrial viewing and birding\u003c\/strong\u003e with a refractor.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlanetary and deep-sky visual observing\u003c\/strong\u003e, which SVBONY lists for refractors.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutreach\u003c\/strong\u003e, where an upright, correctly oriented image helps new observers.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385871110920096872757460.jpg?v=1791669991\" alt=\"SVBONY SV222 45 degree diagonal connected to a telescope\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eSVBONY illustrates the SV222 connected to a telescope, a Barlow lens, an eyepiece and 1.25″ filters:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTelescope side:\u003c\/strong\u003e 1.25″ barrel with an internal M28.5 x 0.6 thread.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBarlow lens:\u003c\/strong\u003e a 1.25″ Barlow fits the eyepiece holder.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEyepieces:\u003c\/strong\u003e any 1.25″ eyepiece, held by screw clamp and brass ring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilters:\u003c\/strong\u003e standard 1.25″ filters thread into the nosepiece.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385871111909460967526333.jpg?v=1791669991\" alt=\"SVBONY SV222 45 degree diagonal connected to a Barlow lens\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385871112895284221320868.jpg?v=1791669991\" alt=\"SVBONY SV222 45 degree diagonal connected to an eyepiece\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385871114351126676608662.jpg?v=1791669991\" alt=\"SVBONY SV222 45 degree diagonal with 1.25 inch telescope filters\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWhat's in the Box\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e1 x SV222 1.25″ 45° metal correct-image prism diagonal\u003c\/li\u003e\n\u003cli\u003eM4 screws\u003c\/li\u003e\n\u003cli\u003e1 x dust cap\u003c\/li\u003e\n\u003cli\u003e1 x dust plug\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e16 mm clear aperture:\u003c\/strong\u003e as published by SVBONY. If you want to check it against a particular wide-field eyepiece, send us the model and we will look at it with you.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRefractor use:\u003c\/strong\u003e SVBONY lists it for refractors.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. It slides into the 1.25″ focuser and the eyepiece locks in with the large thumbscrew.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow is it different from the SV221 45°?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe SV222 has a CNC aluminium body, a BK7 prism with full multi-coating plus phase coating, and an internally baffled light path; the SV221 has an ABS housing with aluminium barrels and a larger 19 mm aperture.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use filters with it?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes, 1.25″ filters thread into the M28.5 x 0.6 nosepiece.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a metal-bodied 1.25″ 45° correct-image diagonal with a phase-coated BK7 prism and baffled interior for refractors used day and night.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"Default Title","offer_id":67722349281391,"sku":"W9179A","price":56.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9179a_20250806143548_7648_20260810144025_3738.webp?v=1791670661"},{"product_id":"svbony-sv222-1-25-90-degree-erect-prism-diagonal","title":"SVBONY SV222 1.25″ 90° Erect-Image Prism Diagonal (Metal)","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385870884191402725418587.jpg?v=1791669997\" alt=\"SVBONY SV222 1.25 inch 90 degree erect prism diagonal key visual\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe SVBONY SV222 90° is a 1.25″ erect-image prism diagonal that gives a right-side-up, non-reversed view at a right angle, so the scene in the eyepiece matches the scene in front of you while you keep a comfortable viewing posture. The BK7 prism has anti-reflection coatings, the body is CNC-machined aluminium, the clear aperture is 19 mm and the optical length about 65.6 mm. The nosepiece carries an M28.5 x 0.6 filter thread, and the diagonal weighs 153.8 g (5.43 oz).\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you use a refractor or catadioptric telescope for both daytime and night-sky viewing and want a correctly oriented image without giving up the comfort of a 90° diagonal.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eErect, non-reversed image at 90°:\u003c\/strong\u003e correct orientation for land targets and easier comparison with star charts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMulti-coated BK7 prism:\u003c\/strong\u003e reduces reflection and scatter for a clearer image.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMatted interior and velvet side panels:\u003c\/strong\u003e absorb stray light inside the housing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrass pressure ring:\u003c\/strong\u003e protects the eyepiece barrel and allows quick eyepiece changes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEyepiece stopper and cone anti-drop insert:\u003c\/strong\u003e keep the eyepiece seated and aligned.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAll-metal CNC aluminium body:\u003c\/strong\u003e built for long-term use.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385870885408903886503548.jpg?v=1791669997\" alt=\"SVBONY SV222 90 degree diagonal multi-coated optics\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385870886610514972545217.jpg?v=1791669997\" alt=\"SVBONY SV222 90 degree diagonal matting and thread design\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385870887642290779578754.jpg?v=1791669997\" alt=\"SVBONY SV222 90 degree diagonal matting velvet on side panels\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eOptical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eA 90° erect-image diagonal uses a roof-type prism that inverts and reverts the image while turning the light path through a right angle. The roof edge produces a faint line through the centre of the field, and SVBONY notes that it can show as a reflection or spike on very bright stars and planets against a dark sky.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385870888525608771362792.jpg?v=1791669997\" alt=\"SVBONY SV222 90 degree diagonal brass pressure ring\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385870889375020837481174.jpg?v=1791669997\" alt=\"SVBONY SV222 90 degree diagonal eyepiece stopper and cone insert\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTerrestrial viewing and birding\u003c\/strong\u003e with a refractor or Maksutov.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLunar observing and casual night-sky viewing\u003c\/strong\u003e with a correctly oriented image.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutreach\u003c\/strong\u003e, where an upright, non-reversed view is easier for everyone at the eyepiece.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385870890422524195421157.jpg?v=1791669997\" alt=\"SVBONY SV222 90 degree diagonal 1.25 inch filter thread\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTelescope side:\u003c\/strong\u003e 1.25″ barrel with an internal M28.5 x 0.6 filter thread.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEyepieces:\u003c\/strong\u003e any 1.25″ eyepiece, held by screw clamp and brass ring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTelescopes:\u003c\/strong\u003e refractors and catadioptrics with a 1.25″ focuser or visual back. SVBONY does not recommend it for Newtonian or Dobsonian reflectors.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385870891338413334528940.jpg?v=1791669997\" alt=\"SVBONY SV222 90 degree diagonal all-metal construction\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385870892253715355172566.jpg?v=1791669997\" alt=\"SVBONY SV222 90 degree diagonal image before and after comparison\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWhat's in the Box\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e1 x SV222 1.25″ 90° metal correct-image prism diagonal\u003c\/li\u003e\n\u003cli\u003eM4 screws\u003c\/li\u003e\n\u003cli\u003e1 x dust cap\u003c\/li\u003e\n\u003cli\u003e1 x dust plug\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRoof-prism line:\u003c\/strong\u003e a faint line can appear on very bright point sources, as SVBONY notes; a mirror diagonal such as the SV221 90° has no roof edge.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNewtonians and Dobsonians:\u003c\/strong\u003e these telescopes do not use a diagonal.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. It slides into the 1.25″ focuser or visual back and the eyepiece locks in with the thumbscrew and brass ring.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the image reversed?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. It is upright and non-reversed, the same as looking with your eyes.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use it for astronomy?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes. It suits the Moon and general night-sky viewing; very bright stars and planets may show the faint roof-prism line SVBONY describes.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it accept filters?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes. 1.25″ filters thread into the M28.5 x 0.6 nosepiece.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: an all-metal 1.25″ 90° erect-image prism diagonal with a coated BK7 prism and filter thread that gives refractors and catadioptrics a correct, comfortable view by day and night.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"Default Title","offer_id":67722357801071,"sku":"W9179B","price":92.33,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9179b_20250806143349_3909_20260810144042_9534.webp?v=1791670708"}],"url":"https:\/\/ontariotelescope.com\/collections\/diagonals-svbony.oembed","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}