{"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","url":"https:\/\/ontariotelescope.com\/products\/svbony-sv222-1-25-45-degree-correct-image-prism-diagonal","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}