{"title":"Diagonals","description":"\u003cdiv\u003e\n  \u003cp\u003e\n    A star diagonal turns an unusable viewing angle into a comfortable one, and in doing so becomes one more optical surface between your objective and your eye. How good that surface is determines whether you keep the contrast the telescope worked to produce. David Astro carries diagonals in Canada — dielectric mirrors, prisms and Amici designs in 1.25\" and 2\" — in stock and shipping from Canada.\n  \u003c\/p\u003e\n  \u003cp\u003e\n    The mirror-versus-prism question has a real answer, and it depends on your telescope's focal ratio. Tell us the telescope and we will make a recommendation you can rely on.\n  \u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- more --\u003e\n\u003cdiv\u003e\n  \u003ch2\u003eMirror Diagonals, Prisms and Optical Path\u003c\/h2\u003e\n  \u003cp\u003e\n    Every diagonal adds roughly 90 to 130 mm of optical path, which affects whether your telescope reaches focus — a detail that matters more than most buyers expect.\n  \u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDielectric mirror diagonals:\u003c\/strong\u003e Multi-layer coatings exceeding 99% reflectivity across the visible spectrum, with no chromatic effect at any focal ratio. The default choice for most telescopes.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePrism diagonals:\u003c\/strong\u003e Total internal reflection with excellent light throughput and slightly better scatter control, and they can outperform mirrors at f\/10 and slower. In fast refractors they introduce chromatic aberration.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAmici roof prisms:\u003c\/strong\u003e Produce a correctly oriented image for terrestrial use, at the cost of a diffraction spike on bright stars that makes them poor for astronomy.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003e1.25 inch versus 2 inch:\u003c\/strong\u003e A 2 inch diagonal is required to use 2 inch eyepieces and passes a wider field; a 1.25 inch is lighter and adds less back-focus.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCompression ring clamping:\u003c\/strong\u003e Even radial grip on the eyepiece barrel rather than a single set screw, which prevents marking and keeps heavy eyepieces square.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eBack-focus consequences:\u003c\/strong\u003e Newtonians rarely accept a diagonal at all; refractors and Cassegrains generally have enough travel. Check before assuming.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n  \u003ch2\u003eWhy Choose David Astro for Diagonals\u003c\/h2\u003e\n  \u003cp\u003e\n    A diagonal is not a neutral component, and the right one depends on the telescope in front of it.\n  \u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFocal ratio matched:\u003c\/strong\u003e We recommend a prism only where it will genuinely outperform a dielectric mirror, and never in a fast refractor where it would introduce colour.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eBack-focus checked:\u003c\/strong\u003e We confirm your telescope has the inward travel to reach focus with the diagonal and your eyepiece or camera.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eWeight considered:\u003c\/strong\u003e A heavy 2 inch diagonal plus a heavy eyepiece can unbalance a small refractor, and we will mention it before you discover it in the dark.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAuthorized dealer:\u003c\/strong\u003e Genuine diagonals with verified coatings and manufacturer warranty, in Canadian stock.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eShips from Canada:\u003c\/strong\u003e No duties or brokerage fees on Canadian orders.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n  \u003ch2\u003eDiagonals in Canada — Frequently Asked Questions\u003c\/h2\u003e\n  \u003cdl\u003e\n    \u003cdt\u003e\u003cstrong\u003eDielectric mirror or prism?\u003c\/strong\u003e\u003c\/dt\u003e\n    \u003cdd\u003eDielectric for almost all telescopes, and especially anything faster than f\/8. A good prism can edge ahead on planetary contrast at f\/10 and slower, where its chromatic contribution is negligible.\u003c\/dd\u003e\n    \u003cdt\u003e\u003cstrong\u003eDo I need a 2 inch diagonal?\u003c\/strong\u003e\u003c\/dt\u003e\n    \u003cdd\u003eOnly if you want to use 2 inch eyepieces for wide low-power fields. If your widest eyepiece is 1.25 inch, a 2 inch diagonal adds weight and back-focus with no benefit.\u003c\/dd\u003e\n    \u003cdt\u003e\u003cstrong\u003eWhy does my telescope not reach focus with a diagonal?\u003c\/strong\u003e\u003c\/dt\u003e\n    \u003cdd\u003eA diagonal adds around 100 mm to the optical path. Newtonians generally lack the inward travel to absorb it. Refractors and Cassegrains are designed with a diagonal in mind and usually have no issue.\u003c\/dd\u003e\n    \u003cdt\u003e\u003cstrong\u003eIs an Amici prism suitable for astronomy?\u003c\/strong\u003e\u003c\/dt\u003e\n    \u003cdd\u003eNot really. It corrects image orientation for terrestrial viewing but produces a diffraction spike across bright stars that is distracting on the Moon and planets.\u003c\/dd\u003e\n  \u003c\/dl\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n  \u003ch2\u003eChoosing a diagonal?\u003c\/h2\u003e\n  \u003cp\u003eTell us your telescope and focal ratio and we will recommend mirror or prism. Authorized dealer, Canadian stock.\u003c\/p\u003e\n\u003c\/div\u003e","products":[{"product_id":"celestron-star-diagonal-1-25","title":"Celestron Star Diagonal - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eProvides a comfortable 90° viewing angle\u003c\/li\u003e\n\u003cli\u003eInserts into any 1.25\" telescope focuser or visual back\u003c\/li\u003e\n\u003cli\u003eAccepts standard 1.25\" eyepieces\u003c\/li\u003e\n\u003cli\u003eCorrects image orientation to be right-side-up\u003c\/li\u003e\n\u003cli\u003eIdeal for refractors and catadioptric telescopes\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eCelestron Star Diagonal - 1.25\"\u003c\/h2\u003e\n\u003cp\u003eThe Celestron 1.25\" Star Diagonal redirects your telescope's light path by 90°, allowing for a dramatically more comfortable viewing position. This essential accessory fits any refractor or catadioptric telescope that uses a standard 1.25\" focuser and eyepieces, making it a fundamental upgrade for visual astronomy.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe 90° Solution for Comfortable Observing\u003c\/h3\u003e\n\u003cp\u003eViewing objects near the zenith (directly overhead) without a diagonal requires crouching in an awkward, uncomfortable position that causes significant neck strain. By turning the eyepiece out to a 90° angle, this diagonal lets you observe for hours in a relaxed posture, whether you are seated or standing. This simple ergonomic improvement is critical for enjoying long sessions at the eyepiece without fatigue.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eStandard 1.25\" Fit and Correct-Image Orientation\u003c\/h3\u003e\n\u003cp\u003eDesigned for maximum compatibility, the Celestron 1.25\" diagonal slides directly into the focuser of most refractors, Schmidt-Cassegrain (SCT), and Maksutov-Cassegrain (Mak) telescopes. It also presents an image that is right-side-up, which is more intuitive for navigating the sky than the inverted view seen without a diagonal.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eUniversal Compatibility:\u003c\/strong\u003e The 1.25\" barrel format is the most common standard in astronomy, ensuring this diagonal will work with a vast range of telescopes and eyepieces.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImage Orientation:\u003c\/strong\u003e The view is corrected vertically, so objects appear upright. The image is, however, reversed from left to right, which is standard for all mirror diagonals and is not a hindrance for astronomical observation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTerrestrial Viewing Trade-off:\u003c\/strong\u003e Because of the left-right reversal, this diagonal is not recommended for terrestrial viewing where correct image orientation is required. For daytime use, an erecting prism is necessary.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy do I need a star diagonal for my refractor or SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA star diagonal, like this Celestron 1.25\" model, is essential for comfortable viewing. Without it, you would have to look straight through the telescope, which becomes extremely difficult and causes neck strain when observing objects high in the sky. The 90° angle allows you to look down into the eyepiece from a comfortable position.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Celestron 1.25\" Star Diagonal work with my Newtonian reflector telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. Newtonian reflectors have their focuser on the side of the tube, which is already at a comfortable 90° angle. Adding a star diagonal would not only be redundant but would also push the eyepiece out too far, preventing the telescope from reaching focus.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does \"right side up, but reversed left-to-right\" mean when viewing the Moon with this diagonal?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhen you observe the Moon through the Celestron 1.25\" Star Diagonal, craters and seas will appear upright, just as you see them with your naked eye. However, the left and right sides will be swapped. For example, the Sea of Tranquility (Mare Tranquillitatis), which is on the eastern limb (left side from the northern hemisphere), will appear to be on the right side of the lunar disc.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use this Celestron 1.25\" diagonal for bird watching?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt is not recommended. While the image will be upright, the left-to-right reversal makes it very difficult to follow moving objects like birds or boats. For terrestrial viewing, you should use a 45° or 90° \"correct-image\" or \"erecting\" prism diagonal, which corrects the view on both axes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the Celestron 1.25\" Star Diagonal affect the focus of my telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, all diagonals add to the optical path length. Refractor and catadioptric (SCT, Mak) telescopes are designed with enough focus travel to accommodate a diagonal. You will simply need to adjust the focuser to achieve a sharp image. This diagonal will not cause any issues with reaching focus on a compatible telescope.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat telescopes are compatible with the Celestron 1.25\" Diagonal?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis diagonal is compatible with any telescope that uses a 1.25\" focuser and does not have a built-in diagonal. This includes most:\n\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eRefractor telescopes\u003c\/li\u003e\n\u003cli\u003eSchmidt-Cassegrain telescopes (SCTs)\u003c\/li\u003e\n\u003cli\u003eMaksutov-Cassegrain telescopes (Maks)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eViewing Angle\u003c\/td\u003e\n\u003ctd\u003e90°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Orientation\u003c\/td\u003e\n\u003ctd\u003eRight side up, reversed left-to-right\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible Telescope Designs\u003c\/td\u003e\n\u003ctd\u003eRefractors, Schmidt-Cassegrain, Maksutov-Cassegrain\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cimg class=\"DAV-img-box\" alt=\"Celestron 1.25 inch Star Diagonal\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/94115-A-1.jpg?v=1686000000\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eCelestron 1.25\" Star Diagonal\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cimg class=\"DAV-img-box\" alt=\"Dust caps for 1.25 inch diagonal\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Celestron-1point25inch-Dustcap.jpg?v=1776900000\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDust Caps\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 2\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/davidastro.com\/pages\/celestron-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eCelestron 2-Year Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":44967146094877,"sku":"CEL-94115-A","price":62.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Celestron-1-25-inch-Star-Diagonal-94115-A-1__33051.1594230250.1280.1280.jpg?v=1684337179"},{"product_id":"celestron-mirror-diagonal-with-xlt-coatings-2","title":"Celestron Mirror Diagonal with XLT Coatings - 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eInterferometer-tested mirror with 1\/10 wave or better surface accuracy\u003c\/li\u003e\n\u003cli\u003eFeatures Celestron's proprietary XLT optical coatings for maximum light transmission\u003c\/li\u003e\n\u003cli\u003eThreads directly onto the rear cell of Schmidt-Cassegrain telescopes for a secure connection\u003c\/li\u003e\n\u003cli\u003eIncludes a 2\" to 1.25\" adapter for use with any eyepiece format\u003c\/li\u003e\n\u003cli\u003eComes with a protective aluminum storage case\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eCelestron Mirror Diagonal with XLT Coatings - 2\"\u003c\/h2\u003e\n\u003cp\u003eThe Celestron 2\" Mirror Diagonal with XLT Coatings delivers the optical precision required for critical observation, built around a mirror guaranteed to be 1\/10 wave or better. This diagonal securely threads onto the rear cell of a Schmidt-Cassegrain, providing a stable platform for your heaviest 2\" eyepieces while also accommodating 1.25\" eyepieces via the included adapter.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA 1\/10 Wave Mirror with High-Transmission XLT Coatings\u003c\/h3\u003e\n\u003cp\u003eAt the heart of this diagonal is an interferometer-tested mirror with a surface accuracy of 1\/10 wave or better. This level of precision prevents the introduction of optical errors, preserving the sharpness and contrast your telescope is designed to deliver. The mirror surface is treated with Celestron's premier XLT coatings, the same multi-layer coatings used on their high-end telescopes, which dramatically increase light transmission over standard aluminum for visibly brighter images.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe 2-Inch Format Advantage for Deep-Sky Observing\u003c\/h3\u003e\n\u003cp\u003eUpgrading to a 2\" diagonal is essential for unlocking wide-field views and observing faint deep-sky objects. The larger barrel allows your telescope's full light cone to illuminate the field stop of a 2\" low-power eyepiece. This results in a significantly wider true field of view and brighter images for large targets like the Andromeda Galaxy (M31) or the Orion Nebula (M42), which cannot be framed in their entirety with a 1.25\" eyepiece at the same focal length.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eSecure SCT Connection and 1.25\" Eyepiece Versatility\u003c\/h3\u003e\n\u003cp\u003eUnlike standard slip-in diagonals that can sag or tilt under the weight of heavy accessories, the Celestron 2\" XLT Diagonal threads directly onto the rear cell of an SCT. This rigid, secure connection ensures perfect optical alignment all night long, even when using large eyepieces or camera adapters. The precision-machined housing holds the mirror in exact collimation, while the included 2\" to 1.25\" adapter lets you switch between eyepiece formats in seconds without compromising stability.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eCelestron XLT vs. Standard Stock Diagonals: A Worthwhile Upgrade\u003c\/h3\u003e\n\u003cp\u003eMany telescopes come with a basic \"stock\" diagonal, which is typically the weakest link in the optical chain. The Celestron 2\" XLT Diagonal represents a significant upgrade in two key areas.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptical Accuracy:\u003c\/strong\u003e Most standard diagonals use a 1\/4 wave mirror, which can soften fine planetary detail. The 1\/10 wave mirror in the XLT diagonal maintains the sharpness of the primary optics, resulting in higher-resolution views.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLight Throughput:\u003c\/strong\u003e The XLT coatings transmit measurably more light than the simple aluminum coatings on stock diagonals. This difference is immediately apparent on faint objects like galaxies and nebulae, where every photon counts.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Celestron 2\" XLT Diagonal improve views in my 8\" SCT over the stock diagonal?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, absolutely. An 8\" SCT has excellent optics, and a lower-quality diagonal can limit its potential. The \u003cstrong\u003e1\/10 wave mirror\u003c\/strong\u003e will preserve the fine detail the telescope can resolve, and the \u003cstrong\u003eXLT coatings\u003c\/strong\u003e will provide a noticeably brighter image on deep-sky objects compared to the standard 1.25\" diagonal included with the telescope.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 1\/10 wave mirror help when observing Jupiter or Saturn?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003ePlanetary observation relies on seeing maximum sharpness and contrast. A mirror with 1\/10 wave accuracy introduces virtually no distortion to the light path. This means fine details like Jupiter's cloud bands, the Great Red Spot, or the Cassini Division in Saturn's rings will appear sharper and more defined than with a standard 1\/4 wave diagonal.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the advantage of this mirror diagonal over a prism diagonal?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor telescopes with a focal ratio of f\/7 or slower, like an SCT, a high-quality mirror diagonal is generally superior. Mirror diagonals are more color-neutral and do not introduce the chromatic aberration that some prism diagonals can, especially at high magnifications. The XLT mirror coatings also provide excellent light transmission across the entire visual spectrum.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes this Celestron diagonal thread directly onto all SCTs?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis diagonal is designed to thread onto the standard rear cell of most Schmidt-Cassegrain telescopes, including virtually all models made by Celestron and Meade. It provides a much more secure connection than a slip-in diagonal that relies on a visual back and thumbscrews.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use 2\" filters with the Celestron XLT Diagonal?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The barrel of the diagonal is threaded to accept standard 2\" astronomy filters. You can thread a filter directly onto the diagonal and then insert any 2\" eyepiece, or you can thread filters onto the individual eyepieces themselves.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is the included aluminum case for the XLT diagonal important?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA diagonal's mirror is a sensitive optical surface. The foam-lined aluminum case protects it from dust, moisture, and impacts during transport and storage. Keeping the mirror clean and the housing perfectly aligned is critical to maintaining its 1\/10 wave performance, and the case ensures it stays in pristine condition.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eMirror Diagonal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMirror Accuracy\u003c\/td\u003e\n\u003ctd\u003e1\/10 wave or better\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eXLT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAdapter\u003c\/td\u003e\n\u003ctd\u003e2\" to 1.25\" included\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTelescope Connection\u003c\/td\u003e\n\u003ctd\u003eThreads on to SCT rear cell\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cimg class=\"DAV-img-box\" alt=\"Celestron 2-inch Mirror Diagonal with XLT Coatings\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/celestron-2-xlt-sct-diagonal-1.jpg?v=1716499870\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e2\" Mirror Diagonal with XLT Coatings\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cimg class=\"DAV-img-box\" alt=\"2-inch to 1.25-inch Eyepiece Adapter\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/celestron-2-xlt-sct-diagonal-4.jpg?v=1716499870\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e2\" to 1.25\" Adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cimg class=\"DAV-img-box\" alt=\"Aluminum Storage Case\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/celestron-2-xlt-sct-diagonal-2.jpg?v=1716499870\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eAluminum Case\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/davidastro.com\/pages\/celestron-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eCelestron 2-Year Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":44967146127645,"sku":"CEL-93527","price":257.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Celestron-2-inch-Mirror-Diagonal-with-XLT-Coatings-93527-1__58186.1594230250.1280.1280.jpg?v=1684337182"},{"product_id":"celestron-45-degree-erect-image-diagonal","title":"Celestron 45-Degree Erect Image Diagonal","description":"\u003cul class=\"DAV-feature-list\"\u003e\n  \u003cli\u003eCorrects image orientation for terrestrial viewing\u003c\/li\u003e\n  \u003cli\u003eProduces right-side-up and left-to-right correct images\u003c\/li\u003e\n  \u003cli\u003eComfortable 45-degree viewing angle for daytime use\u003c\/li\u003e\n  \u003cli\u003eCompatible with refractor and catadioptric telescopes (SCTs, Maks)\u003c\/li\u003e\n  \u003cli\u003eStandard 1.25\" barrel size\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n  \u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n  \u003cli\u003eFAQ\u003c\/li\u003e\n  \u003cli\u003eSpecifications\u003c\/li\u003e\n  \u003cli\u003eIn the Box\u003c\/li\u003e\n  \u003cli\u003eDownloads\u003c\/li\u003e\n  \u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n  \u003cli class=\"active\"\u003e\n    \u003cdiv\u003e\n      \u003cdiv class=\"DAV-bg-light\"\u003e\n        \u003cdiv class=\"DAV-section-center\"\u003e\n          \u003ch2\u003eCelestron 45-Degree Erect Image Diagonal\u003c\/h2\u003e\n          \u003cp\u003eThe Celestron 45-Degree Erect Image Diagonal is the essential accessory for turning your astronomical telescope into a high-power daytime spotting scope. This diagonal uses an Amici prism to provide a correctly oriented, right-side-up and left-to-right image, making it indispensable for terrestrial observation, all backed by a 2-Year Warranty.\u003c\/p\u003e\n        \u003c\/div\u003e\n      \u003c\/div\u003e\n      \u003cdiv class=\"DAV-bg-light\"\u003e\n        \u003cdiv class=\"DAV-section\"\u003e\n          \u003ch3\u003eCorrecting Your View for Terrestrial Observation\u003c\/h3\u003e\n          \u003cp\u003eA standard star diagonal renders images upside-down or mirrored, which is disorienting for terrestrial viewing. The Celestron 45-Degree Erect Image Diagonal solves this by reorienting the light path. Simply swap it with your telescope's standard diagonal to see the world as it is—right-side up and dimensionally correct—making it easy to track birds, boats, or distant landscapes.\u003c\/p\u003e\n        \u003c\/div\u003e\n      \u003c\/div\u003e\n      \u003cdiv class=\"DAV-bg-light\"\u003e\n        \u003cdiv class=\"DAV-section\"\u003e\n          \u003ch3\u003eThe 45-Degree Advantage for Refractors and SCTs\u003c\/h3\u003e\n          \u003cp\u003eThe 45-degree viewing angle is specifically designed for comfort during terrestrial observing, when your telescope is often aimed horizontally. This diagonal is fully compatible with any refractor or Schmidt-Cassegrain (SCT) telescope that uses a standard 1.25\" focuser or visual back.\u003c\/p\u003e\n          \u003cul\u003e\n            \u003cli\u003e\n              \u003cstrong\u003eAmici Prism Design:\u003c\/strong\u003e Ensures a fully corrected image, unlike standard mirror diagonals that only correct one axis.\n            \u003c\/li\u003e\n            \u003cli\u003e\n              \u003cstrong\u003eDaytime Comfort:\u003c\/strong\u003e The 45-degree angle reduces neck strain when observing subjects on or near the horizon.\n            \u003c\/li\u003e\n            \u003cli\u003e\n              \u003cstrong\u003eImportant Limitation:\u003c\/strong\u003e This diagonal is not intended for Newtonian reflector telescopes. The optical design of a Newtonian will prevent this accessory from producing a fully corrected image.\n            \u003c\/li\u003e\n          \u003c\/ul\u003e\n        \u003c\/div\u003e\n      \u003c\/div\u003e\n      \u003cdiv class=\"DAV-bg-light\"\u003e\n        \u003cdiv class=\"DAV-section\"\u003e\n          \u003ch3\u003e45-Degree Erect Image Diagonal vs. Standard 90-Degree Star Diagonal\u003c\/h3\u003e\n          \u003cp\u003eWhile a 90-degree star diagonal is ideal for astronomy where the telescope points high into the sky, it's less practical for terrestrial use. The key difference lies in the image orientation and viewing angle.\u003c\/p\u003e\n          \u003cul\u003e\n            \u003cli\u003e\n              \u003cstrong\u003eImage Orientation:\u003c\/strong\u003e A standard 90-degree diagonal typically produces an image that is right-side up but reversed left-to-right. The 45-degree erect image diagonal corrects both axes.\n            \u003c\/li\u003e\n            \u003cli\u003e\n              \u003cstrong\u003eViewing Angle:\u003c\/strong\u003e The 45-degree angle of this diagonal is far more natural and comfortable for horizontal viewing than the steep 90-degree angle of a star diagonal.\n            \u003c\/li\u003e\n          \u003c\/ul\u003e\n        \u003c\/div\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/li\u003e\n  \u003cli\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n      \u003ch3 class=\"DAV-accordion-Q\"\u003eWhy do I need a 45-Degree Erect Image Diagonal for birdwatching with my SCT?\u003c\/h3\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion-A\"\u003e\n      \u003cp\u003eWithout an erect image diagonal, the view through your Schmidt-Cassegrain telescope will be either upside-down or mirror-reversed. This makes tracking a moving bird nearly impossible. The Celestron 45-Degree Erect Image Diagonal corrects the view to be right-side up and left-to-right correct, just like looking through binoculars.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n      \u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Celestron 45-Degree Diagonal for astronomy?\u003c\/h3\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion-A\"\u003e\n      \u003cp\u003eWhile you can, it's not ideal. The Amici prism design has a slight ridge in the center that can cause a faint spike on very bright objects like planets or bright stars. For the highest-contrast astronomical views, a dedicated 90-degree mirror or prism star diagonal is recommended.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n      \u003ch3 class=\"DAV-accordion-Q\"\u003eWill this 45-Degree Erect Image Diagonal work on my Newtonian reflector telescope?\u003c\/h3\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion-A\"\u003e\n      \u003cp\u003eNo. Due to the optical design of Newtonian reflectors, this diagonal will not produce a fully corrected image. The image orientation will still be rotationally off, and you may not be able to reach focus. This accessory is designed exclusively for refractors and catadioptric telescopes like SCTs and Maksutov-Cassegrains.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n      \u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Celestron 45-Degree Diagonal hard to install on my telescope?\u003c\/h3\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion-A\"\u003e\n      \u003cp\u003eInstallation is simple. You just remove your existing 1.25\" diagonal from the telescope's focuser or visual back by loosening the thumbscrews, and then insert the 45-Degree Erect Image Diagonal in its place and tighten the screws. It takes only a few seconds.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n      \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat's the main benefit of the 45-degree angle over a 90-degree angle?\u003c\/h3\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion-A\"\u003e\n      \u003cp\u003eFor terrestrial viewing, your telescope is typically horizontal. The 45-degree angle allows you to look down into the eyepiece comfortably. A 90-degree angle would force you to bend over at an awkward angle to see through the eyepiece when the telescope is aimed at the horizon.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n      \u003ch3 class=\"DAV-accordion-Q\"\u003eI have a Celestron refractor. Will this diagonal allow me to read a sign across the street?\u003c\/h3\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion-A\"\u003e\n      \u003cp\u003eYes, absolutely. A standard diagonal would show the text reversed as if in a mirror. The Celestron 45-Degree Erect Image Diagonal will present the text correctly, making it readable. This is a perfect example of what this accessory is designed for.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/li\u003e\n  \u003cli\u003e\n    \u003ctable class=\"DAV-specifications\"\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eViewing Angle\u003c\/td\u003e\n          \u003ctd\u003e45 Degrees\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003ePrism Type\u003c\/td\u003e\n          \u003ctd\u003eAmici Roof Prism\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eImage Orientation\u003c\/td\u003e\n          \u003ctd\u003eErect and Correct Left-to-Right\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eBarrel Size\u003c\/td\u003e\n          \u003ctd\u003e1.25\"\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eCompatibility\u003c\/td\u003e\n          \u003ctd\u003eRefractors and Schmidt-Cassegrain \/ Maksutov-Cassegrain Telescopes\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eWarranty\u003c\/td\u003e\n          \u003ctd\u003e2-Year Warranty\u003c\/td\u003e\n        \u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/li\u003e\n  \u003cli\u003e\n    \u003cul class=\"DAV-grid\"\u003e\n      \u003cli class=\"DAV-grid-item\"\u003e\n        \u003cdiv\u003e\n          \u003cp class=\"DAV-item-title\"\u003eCelestron 45-Degree Erect Image Diagonal - 1.25\"\u003c\/p\u003e\n          \u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n        \u003c\/div\u003e\n      \u003c\/li\u003e\n      \u003cli class=\"DAV-grid-item\"\u003e\n        \u003cdiv\u003e\n          \u003cp class=\"DAV-item-title\"\u003eDust Caps\u003c\/p\u003e\n          \u003cp class=\"DAV-item-subtitle\"\u003e× 2\u003c\/p\u003e\n        \u003c\/div\u003e\n      \u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/li\u003e\n  \u003cli\u003e\n    \u003cul class=\"DAV-grid\"\u003e\n    \u003c\/ul\u003e\n  \u003c\/li\u003e\n  \u003cli\u003e\n    \u003ca href=\"https:\/\/davidastro.com\/pages\/celestron-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eCelestron 2-Year Warranty\u003c\/a\u003e\n  \u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":44967146193181,"sku":"CEL-94112-A","price":62.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Celestron-45-Degree-Erect-Image-Diagonal-94112-A-1__59001.1594230251.1280.1280.jpg?v=1684337189"},{"product_id":"celestron-dielectric-star-diagonal-with-twist-lock-1-25","title":"Celestron Dielectric Star Diagonal with Twist-Lock - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eOver 99% reflectivity from 58-layer dielectric mirror coatings\u003c\/li\u003e\n\u003cli\u003e1.25” Twist-Lock holder provides a secure, self-centering grip\u003c\/li\u003e\n\u003cli\u003eDiffraction-limited optics maintain your telescope's image quality\u003c\/li\u003e\n\u003cli\u003eMachined aluminum housing with glare-threaded interior\u003c\/li\u003e\n\u003cli\u003eAccepts standard 1.25\" eyepiece filters\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eCelestron Dielectric Star Diagonal, 1.25” with Twist-Lock\u003c\/h2\u003e\n\u003cp\u003eThe Celestron Dielectric Star Diagonal, 1.25” with Twist-Lock, upgrades your telescope's optical train with a diffraction-limited BK7 mirror featuring 58 layers of dielectric coatings. These coatings achieve over 99% reflectivity, ensuring maximum light transmission for brighter, higher-contrast images. The diagonal weighs just 7.5 oz (212.6 g) and is housed in a durable, machined aluminum body measuring 4.5\" x 2\" x 3.5\".\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e99% Reflectivity from 58-Layer Dielectric Coatings\u003c\/h3\u003e\n\u003cp\u003eThe core of this diagonal is its BK7 mirror, which is coated with 58 layers of dielectric material to achieve over 99% reflectivity across the visual spectrum. Unlike standard aluminum or silver coatings that can degrade over time, these dielectric layers are highly durable and deliver consistently bright and sharp images. This ensures that the maximum amount of light collected by your telescope reaches your eyepiece, which is critical for observing faint deep-sky objects and resolving fine planetary detail.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe 1.25\" Twist-Lock Eyepiece Holder\u003c\/h3\u003e\n\u003cp\u003eA significant upgrade from traditional thumbscrew holders, the Twist-Lock mechanism provides a secure, perfectly centered grip on any 1.25\" eyepiece. A simple twist of the orange ring tightens a single compression ring, locking the eyepiece in place without scratching or marring its barrel. This self-centering action guarantees optimal opto-mechanical alignment, preserving the sharpness your telescope is capable of. An integrated barrel stop also prevents accessories with long barrels from making contact with the diagonal's mirror.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eCelestron Dielectric vs. Standard Diagonals: A Brighter Image\u003c\/h3\u003e\n\u003cp\u003eA star diagonal is a critical component, and a lower-quality one can dim the view and degrade image quality. Standard aluminum diagonals typically offer 88-92% reflectivity, meaning a significant portion of the light from your telescope never reaches your eye. The Celestron Dielectric Star Diagonal, with its over 99% reflectivity, delivers a visibly brighter image. This upgrade alone can make the difference between detecting a faint galaxy's spiral arms or resolving subtle cloud bands on Jupiter.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMachined Aluminum Construction:\u003c\/strong\u003e The black anodized aluminum housing is built for durability and rigidity, preventing flexure that can misalign optics.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGlare Control:\u003c\/strong\u003e The interior of the 1.25\" barrel is both glare-threaded and painted flat black to absorb stray light, maximizing image contrast.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilter Compatibility:\u003c\/strong\u003e The barrel is threaded to accept standard 1.25\" astronomy filters, allowing you to easily enhance views of the Moon, planets, and nebulae.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the Celestron Dielectric Star Diagonal improve views of Jupiter through my 8\" SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAn 8\" SCT gathers a lot of light, and you want as much of it as possible to reach your eye. With over \u003cstrong\u003e99% reflectivity\u003c\/strong\u003e, this diagonal transmits more light than a standard one, making Jupiter's cloud belts and Great Red Spot appear brighter and with higher contrast. The diffraction-limited optics ensure you're seeing the full detail your telescope can resolve.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Twist-Lock holder on this diagonal secure enough for heavy 1.25\" eyepieces?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The Twist-Lock mechanism uses a \u003cstrong\u003esingle compression ring\u003c\/strong\u003e that applies even, firm pressure around the entire eyepiece barrel. This provides a more secure grip than a single thumbscrew, making it ideal for holding heavier, multi-element 1.25\" eyepieces, even when the telescope is pointed at the zenith.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Celestron 1.25\" Dielectric Diagonal work with my refractor telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. This diagonal is designed for any telescope with a 1.25\" focuser or visual back, including refractors, Schmidt-Cassegrains (SCTs), and Maksutov-Cassegrains (MCTs). It provides a more comfortable 90° viewing angle, which is especially useful for refractors when observing objects high in the sky.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the advantage of 58-layer dielectric coatings over standard aluminum?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eDielectric coatings are more reflective (over 99% vs. ~92% for enhanced aluminum) and far more durable. They are highly resistant to oxidation and cleaning, meaning the diagonal will maintain its peak brightness and contrast for many years, unlike aluminum coatings which can tarnish over time.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use 1.25\" filters with the Celestron Dielectric Star Diagonal?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the 1.25\" nosepiece of the diagonal is threaded to accept standard 1.25\" eyepiece filters. You can easily attach a Moon filter, a light pollution filter, or colored planetary filters before inserting the diagonal into your telescope's focuser.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does \"diffraction-limited\" optical quality mean for this diagonal?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt means the mirror surface is smooth and accurate enough that it does not introduce any perceptible degradation to the image formed by the telescope. A diffraction-limited diagonal will pass the light through without adding aberrations, preserving the finest details your main optics can resolve.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiagonal Size\u003c\/td\u003e\n\u003ctd\u003e31.75mm (1.25\")\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\u003e1.25\", Twist-Lock\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompression Ring\u003c\/td\u003e\n\u003ctd\u003eYes, single ring\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\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\u003eFilter Threads\u003c\/td\u003e\n\u003ctd\u003eYes, 1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e114.3mm x 50.8mm x 88.9mm (4.5\" x 2\" x 3.5\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e7.5 oz (212.6 g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e1.25” Dielectric Star Diagonal with Twist-Lock\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e1.25\" Barrel Dust Cap\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e1.25\" Eyepiece Holder Dust Cap\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.celestron.com\/pages\/drivers-and-software\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e \n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Software\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/davidastro.com\/pages\/celestron-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eCelestron 2-Year Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":44967146258717,"sku":"CEL-93571","price":222.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Celestron-Dielectric-Star-Diagonal-1-25-inch-with-Twist-Lock-93571-1__79941.1594230252.1280.1280.jpg?v=1684337198"},{"product_id":"celestron-dielectric-star-diagonal-with-twist-lock-2","title":"Celestron Dielectric Star Diagonal with Twist-Lock - 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eDelivers over 99% reflectivity with 58 layers of dielectric coatings\u003c\/li\u003e\n\u003cli\u003eSecure, self-centering Twist-Lock mechanism for 2\" and 1.25\" eyepieces\u003c\/li\u003e\n\u003cli\u003eIncludes interchangeable 2\" and SCT barrels for universal telescope compatibility\u003c\/li\u003e\n\u003cli\u003eDiffraction-limited optics ensure maximum image sharpness\u003c\/li\u003e\n\u003cli\u003eMachined aluminum housing with glare-threaded interior for high contrast\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eCelestron Dielectric Star Diagonal, 2” with Twist-Lock\u003c\/h2\u003e\n\u003cp\u003eThe Celestron Dielectric Star Diagonal, 2” with Twist-Lock, is an essential upgrade for maximizing your telescope's optical performance. Its diffraction-limited BK7 mirror is treated with 58 layers of advanced dielectric coatings to achieve over 99% reflectivity, ensuring the brightest possible images reach your eyepiece. This 19 oz (538.6 g) diagonal provides a secure, perfectly centered connection for both 2\" and 1.25\" eyepieces via its non-marring Twist-Lock holders. With interchangeable barrels for both standard 2\" focusers and Schmidt-Cassegrain telescopes, it offers premium optical and mechanical quality for nearly any instrument.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e99%+ Reflectivity: 58-Layer Dielectric Coatings\u003c\/h3\u003e\n\u003cp\u003eThe core of this diagonal is a precision BK7 mirror engineered to be diffraction-limited, meaning it will not introduce any perceptible aberrations to the light path. This optical precision is protected by 58 layers of dielectric coatings, which push its light-gathering power to the theoretical maximum. With over 99% reflectivity, you lose virtually no light, resulting in visibly brighter images, higher contrast on faint deep-sky objects, and more vibrant planetary detail compared to standard aluminum or silver diagonals.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eDual Twist-Lock Holders: Scratch-Free Clamping for 2\" and 1.25\" Eyepieces\u003c\/h3\u003e\n\u003cp\u003eCelestron replaces traditional thumbscrews with a superior Twist-Lock mechanism on both the main 2\" holder and the included 1.25\" step-down adapter. A simple twist of the orange anodized ring activates an internal compression ring that applies uniform pressure, perfectly centering the eyepiece in the optical path. This system not only provides a more secure hold but also guarantees that the barrels of your valuable eyepieces will never be scratched or scored.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMachined Construction:\u003c\/strong\u003e The housing is built from black anodized, machined aluminum for durability and stray light control.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInternal Safety:\u003c\/strong\u003e An integrated stop within the 2\" barrel prevents long-barreled eyepieces or accessories from hitting the mirror surface.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGlare Reduction:\u003c\/strong\u003e The interior of the barrels are glare-threaded and painted flat black to absorb off-axis reflections and maximize image contrast.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e2 Included Barrels: Universal Fit for Refractors and SCTs\u003c\/h3\u003e\n\u003cp\u003eThis diagonal is designed for immediate use on the two most common telescope types without requiring additional adapters. It includes two interchangeable barrels that thread securely onto the main diagonal housing for a rigid, flex-free connection. One barrel is a standard 2\" nosepiece for refractors and other telescopes with 2\" focusers, while the other is a dedicated SCT adapter for direct, threaded attachment to the rear cell of a Schmidt-Cassegrain. Both the 2\" barrel and the 1.25\" adapter are threaded to accept standard 2\" filters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eCelestron Dielectric vs. Standard Aluminum Diagonals: A Worthy Upgrade\u003c\/h3\u003e\n\u003cp\u003eWhile a standard aluminum diagonal is a functional accessory, it represents a significant bottleneck in the optical chain. The Celestron Dielectric Diagonal is a direct, measurable upgrade in two key areas.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLight Throughput:\u003c\/strong\u003e A standard enhanced aluminum diagonal typically reflects 90-92% of light. The Celestron Dielectric's 99%+ reflectivity delivers a noticeably brighter image, which can be the difference between detecting a faint spiral arm on a galaxy or missing it entirely.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurability:\u003c\/strong\u003e Dielectric coatings are far more durable than aluminum coatings. They will not degrade over time from exposure to the elements, ensuring your diagonal maintains its peak performance for years of use.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat makes the Celestron 2” Dielectric Diagonal with Twist-Lock superior to a standard diagonal?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Celestron Dielectric Diagonal offers two main advantages. First, its \u003cstrong\u003e58-layer dielectric coatings\u003c\/strong\u003e provide over 99% reflectivity, delivering a significantly brighter image than standard aluminum diagonals (which are typically 90-92% reflective). Second, the \u003cstrong\u003eTwist-Lock holder\u003c\/strong\u003e provides a more secure, perfectly centered grip on your eyepieces without the risk of scratching the barrel, unlike traditional thumbscrews.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I attach the Celestron Dielectric Diagonal to my Schmidt-Cassegrain telescope (SCT)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eUnscrew the standard 2\" barrel from the diagonal's body and replace it with the included \u003cstrong\u003eSCT adapter barrel\u003c\/strong\u003e. This allows you to thread the entire diagonal directly onto the rear cell threads of your SCT for the most secure connection possible, eliminating any potential for sag or misalignment.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the \u0026gt;99% reflectivity of this Celestron diagonal make a visible difference on faint objects like the Veil Nebula (NGC 6960)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. For faint, extended objects like the Veil Nebula (NGC 6960) or the Horsehead Nebula (Barnard 33), maximizing light throughput is critical. The jump from ~92% to over 99% reflectivity means more photons are reaching your eye, which can significantly improve contrast and make it easier to see delicate structures, especially when using nebula filters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the advantage of the Twist-Lock holder on the Celestron diagonal over traditional thumbscrews?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Twist-Lock mechanism uses a compression ring to apply even pressure around the entire eyepiece barrel. This offers three benefits: it \u003cstrong\u003eperfectly centers the eyepiece\u003c\/strong\u003e in the optical path, it provides a \u003cstrong\u003emore secure grip\u003c\/strong\u003e than a single screw point, and it \u003cstrong\u003ewill not scratch or mar\u003c\/strong\u003e the finish of your eyepiece barrels.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use my 1.25” eyepieces and filters with this 2” Celestron diagonal?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. The diagonal includes a \u003cstrong\u003e2\" to 1.25\" step-down adapter\u003c\/strong\u003e that also features the secure Twist-Lock mechanism. The 1.25\" adapter itself is threaded to accept standard 2\" filters, so you can use your 2\" filters with your 1.25\" eyepieces.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does 'diffraction limited' mean for the Celestron Dielectric Star Diagonal?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\"Diffraction limited\" is a term for optical quality, indicating that the mirror is so precisely figured that any remaining imperfections are smaller than the theoretical limit of resolution imposed by the physics of light (the Airy disk). In practical terms, it means the diagonal will transmit the image from your telescope without degrading its sharpness or detail.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"2\"\u003e\u003cstrong\u003eOptical Specifications\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\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 colspan=\"2\"\u003e\u003cstrong\u003eMechanical Specifications\u003c\/strong\u003e\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\" 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\" holder, single for 1.25\" 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\u003eIncluded Barrels\u003c\/td\u003e\n\u003ctd\u003e2\" barrel and SCT adapter barrel\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\u003eFilter Threads\u003c\/td\u003e\n\u003ctd\u003eYes, on 2\" barrel and 1.25\" adapter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"2\"\u003e\u003cstrong\u003ePhysical Specifications\u003c\/strong\u003e\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\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDielectric Star Diagonal, 2\"\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e2\" Barrel\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eSCT Adapter Barrel\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e2\" to 1.25\" Twist-Lock Adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/celestron-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eCelestron 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":44967146291485,"sku":"CEL-93573","price":361.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Celestron-Dielectric-Star-Diagonal-2-inch-with-Twist-Lock-93573-1__81338.1594230253.1280.1280.jpg?v=1684337200"},{"product_id":"explore-scientific-99-reflective-diagonal-2","title":"Explore Scientific 99% Reflective Diagonal -2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e2-inch Diagonal Barrel with Tapered Safety Edge\u003c\/li\u003e\n\u003cli\u003e99% Reflectivity from Dielectric Coatings\u003c\/li\u003e\n\u003cli\u003eIncludes 1.25-inch Eyepiece Adapter\u003c\/li\u003e\n\u003cli\u003eNon-Marring Brass Compression Rings\u003c\/li\u003e\n\u003cli\u003eProtects Telescope Optics with Included Dust Covers\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eExplore Scientific 99% Reflective Diagonal - 2\"\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific 99% Reflective Diagonal directs light from your 2-inch focuser to your eyepiece with minimal loss, using advanced dielectric coatings to achieve 99% reflectivity. This package includes a 1.25-inch adapter, allowing you to use eyepieces of both standard barrel sizes while maintaining a bright, high-contrast image path for your refractor or catadioptric telescope.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e99% Dielectric Coatings for Maximum Brightness\u003c\/h3\u003e\n\u003cp\u003eA standard diagonal mirror can lose between 5% and 12% of the light gathered by your telescope, dimming faint details on planets and deep-sky objects. The Explore Scientific diagonal uses multi-layer dielectric coatings on its first-surface mirror to reflect 99% of incoming light, preserving the brightness and contrast your main optics deliver. This difference is immediately noticeable on faint galaxies or the subtle cloud bands of Jupiter.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eSecure 2\" and 1.25\" Connections: Compression Rings \u0026amp; Tapered Barrel\u003c\/h3\u003e\n\u003cp\u003eThis diagonal's mechanical design protects both your equipment and your views. Brass compression rings on both the 2-inch holder and the 1.25-inch adapter gently clamp your eyepieces without marring their barrels, ensuring a secure and centered fit. The 2-inch insert barrel features a double taper, which prevents the diagonal from falling out of the focuser if a set screw accidentally loosens.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eWhy a 99% Dielectric Diagonal Matters vs. Standard Aluminum\u003c\/h3\u003e\n\u003cp\u003eWhile a standard enhanced aluminum diagonal offers around 95% reflectivity when new, its coatings are soft and degrade over time with exposure and cleaning. Dielectric coatings are far more durable—almost as hard as the glass itself—ensuring the 99% reflectivity lasts for the life of the diagonal. For visual observers chasing the faintest details, that extra few percent of light can be the difference between seeing a spiral arm in a galaxy and missing it entirely.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main advantage of the Explore Scientific 99% Reflective Diagonal over a standard one?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary advantage is \u003cstrong\u003elight transmission\u003c\/strong\u003e. The Explore Scientific diagonal's dielectric coatings reflect 99% of light, compared to 88-95% for standard aluminum or silver diagonals. This results in a visibly brighter image, which is critical for observing faint deep-sky objects. These coatings are also far more durable and resistant to aging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill I notice a difference with the Explore Scientific 99% diagonal on faint objects like the Veil Nebula (NGC 6960) in my SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, absolutely. On faint, extended objects like the Veil Nebula (NGC 6960) or the Horsehead Nebula (Barnard 33), maximizing light throughput is essential. The jump from a standard 90% diagonal to this 99% model provides a noticeable boost in contrast and brightness, especially when using nebula filters like an O-III or H-beta.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the compression ring on the Explore Scientific 2\" diagonal protect my eyepieces?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eInstead of a single set screw that digs into the eyepiece barrel, a \u003cstrong\u003ebrass compression ring\u003c\/strong\u003e provides a firm, even grip around the entire circumference. This prevents the ugly scratches and gouges that set screws can cause, preserving the value and finish of your expensive 2-inch and 1.25-inch eyepieces.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Explore Scientific 99% diagonal with my 1.25-inch eyepieces?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The diagonal comes with a \u003cstrong\u003e1.25-inch adapter\u003c\/strong\u003e that fits securely into the 2-inch eyepiece holder. This adapter also uses a brass compression ring, so your 1.25-inch eyepieces receive the same non-marring protection.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI use a refractor for planetary observing. Does a 99% reflective diagonal offer any benefit for Jupiter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile planets like Jupiter are bright, a 99% reflective diagonal still provides a significant benefit. By minimizing light scatter and maximizing transmission, it improves image contrast, making it easier to resolve fine details like small ovals in the cloud belts, subtle colors in the Great Red Spot, and the faint crepe ring of Saturn.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes a dielectric diagonal like the Explore Scientific 2\" model introduce any color error?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. High-quality, multi-layer dielectric mirror coatings are designed to be color-neutral across the entire visual spectrum. Unlike some less expensive diagonals, the Explore Scientific 99% diagonal will not introduce any false color or tint to the image, ensuring the view remains as pure as your telescope's objective lens can deliver.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e2 Inches\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReflectivity\u003c\/td\u003e\n\u003ctd\u003e99%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoating Type\u003c\/td\u003e\n\u003ctd\u003eDielectric\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEyepiece Adapter\u003c\/td\u003e\n\u003ctd\u003e1.25\" Included\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEyepiece Holder\u003c\/td\u003e\n\u003ctd\u003eBrass Compression Ring\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e812257010264\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eExplore Scientific 2\" Dielectric Diagonal\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e1.25\" Eyepiece Adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDust Cover (Telescope Side)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDust Cover (Eyepiece Side)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eThis accessory does not require specific drivers or manuals for operation.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/explore-scientific-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eExplore Scientific Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":44967198884125,"sku":"ES-DD02-00CF","price":307.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-99-Reflective-2-inch-Diagonal-DD02-00CF-1__77122.1594240339.1280.1280.jpg?v=1684338697"},{"product_id":"explore-scientific-99-reflective-diagonal-3","title":"Explore Scientific 99% Reflective Diagonal -3\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e3-inch diagonal body for large format focusers\u003c\/li\u003e\n\u003cli\u003e99% reflectivity from durable dielectric coatings\u003c\/li\u003e\n\u003cli\u003eIncludes a 2-inch eyepiece adapter with compression ring\u003c\/li\u003e\n\u003cli\u003eDouble-tapered barrel prevents accidental falls\u003c\/li\u003e\n\u003cli\u003eSolid, lightweight construction\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eExplore Scientific 99% Reflective Diagonal - 3\"\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific 3-inch Dielectric Diagonal uses a first-surface mirror with a 99% reflective coating to deliver the brightest possible image from your telescope's focal plane to the eyepiece. Designed for telescopes with large 3-inch focusers, this diagonal includes a 2-inch adapter, ensuring it can securely hold the most common large-format eyepieces and imaging accessories.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e99% Dielectric Coating: Maximizing Light Throughput to Your Eyepiece\u003c\/h3\u003e\n\u003cp\u003eA diagonal's primary job is to preserve the light collected by your telescope's main optic. The multi-layer dielectric coating on this mirror reflects 99% of incoming light, a noticeable improvement over standard aluminum or even enhanced aluminum coatings. This increase in brightness is especially critical when observing faint deep-sky objects like the Veil Nebula (NGC 6960) or distant galaxies where every photon counts.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eSecure Mechanical Design: 3-Inch Body with Compression Rings and a Safety Taper\u003c\/h3\u003e\n\u003cp\u003eThis diagonal is built for both stability and safety. Eyepieces are held in place by a brass compression ring on the included 2-inch adapter, which prevents the marring and scratching caused by simple set screws. The 3-inch insert barrel features a double taper, a crucial safety feature that prevents the diagonal from slipping out of the focuser if the locking screw becomes loose.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e3-Inch vs. 2-Inch Diagonals: Why the Larger Format Matters\u003c\/h3\u003e\n\u003cp\u003eWhile a 2-inch diagonal is sufficient for most visual astronomy, a 3-inch model is essential for preventing vignetting in specific applications. Large refractor telescopes and astrographs with 3-inch or larger focusers can illuminate a very wide field, and a 3-inch diagonal ensures that the light cone is not cut off before it reaches a full-frame imaging sensor or an extreme wide-field 2-inch eyepiece.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFor Imagers:\u003c\/strong\u003e If you are using a large-format CMOS or CCD camera, a 3-inch diagonal provides a larger clear aperture to fully illuminate the sensor and avoid darkened corners in your images.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFor Visual Observers:\u003c\/strong\u003e While not always necessary, it provides peace of mind that your widest 2-inch eyepieces are operating without any restriction from the diagonal itself.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main benefit of the Explore Scientific 3-inch Diagonal's 99% reflectivity?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e99% reflectivity\u003c\/strong\u003e from its dielectric coating ensures maximum light transmission from your telescope to your eyepiece. This results in brighter images, which is especially important for viewing faint deep-sky objects like nebulae and galaxies, compared to standard diagonals which may only reflect 90-96% of the light.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Explore Scientific 3-inch Diagonal fit my telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis diagonal is designed specifically for telescopes equipped with a \u003cstrong\u003e3-inch focuser\u003c\/strong\u003e. It will not fit standard 1.25-inch or 2-inch focusers. It is most commonly used with large apochromatic refractors and Ritchey-Chrétien telescopes designed for wide-field imaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy would I need a 3-inch diagonal instead of a 2-inch for my large refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor a large refractor with a 3-inch or larger focuser, a 3-inch diagonal is critical for preventing \u003cstrong\u003evignetting\u003c\/strong\u003e (darkening at the edges of the field of view). This is most apparent when using full-frame imaging sensors or very long focal length, wide-field 2-inch eyepieces that utilize the entire light cone produced by the telescope.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Explore Scientific 3-inch diagonal prevent damaging my eyepieces?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe included 2-inch adapter uses a \u003cstrong\u003ebrass compression ring\u003c\/strong\u003e to secure eyepieces. When you tighten the lock screw, the ring gently and evenly tightens around the eyepiece barrel. This provides a more secure grip than a single set screw and prevents the screw from digging into and scratching the barrel of your expensive eyepieces.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI'm imaging the Andromeda Galaxy (M31) with a full-frame sensor; will this 3-inch diagonal help?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. Imaging a large target like the Andromeda Galaxy (M31) with a full-frame sensor is exactly the scenario where a 3-inch diagonal is most beneficial. It ensures the entire sensor is evenly illuminated by your telescope's light cone, preventing the vignetting that a smaller 2-inch diagonal would likely cause at the corners of your image.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the Explore Scientific 3-inch diagonal include an adapter for 1.25\" eyepieces?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this diagonal comes standard with a \u003cstrong\u003e2-inch adapter only\u003c\/strong\u003e. A separate 2-inch to 1.25-inch adapter would be required to use 1.25-inch eyepieces, though this is not a typical use case for a diagonal of this size.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e812257014774\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSize\u003c\/td\u003e\n\u003ctd\u003e3-inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReflectivity\u003c\/td\u003e\n\u003ctd\u003e99% Dielectric\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Adapter\u003c\/td\u003e\n\u003ctd\u003e2-inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eThis product's \"What's in the Box\" information is currently unavailable.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eThis product's manuals and software are not available for download at this time.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/explore-scientific-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eExplore Scientific Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":44967198916893,"sku":"ES-DD03-01CF","price":825.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-99-Reflective-3-inch-Diagonal-DD03-01CF-1__40342.1594240339.1280.1280.jpg?v=1684338701"},{"product_id":"william-optics-99-dielectric-dura-bright-diagonal-1-25","title":"William Optics 99% Dielectric Dura Bright Diagonal - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e1.25\" Barrel Diameter\u003c\/li\u003e\n\u003cli\u003e99% Dielectric Coated Mirror\u003c\/li\u003e\n\u003cli\u003e1\/12λ Mirror Surface Accuracy\u003c\/li\u003e\n\u003cli\u003e12mm Thick Mirror Substrate\u003c\/li\u003e\n\u003cli\u003e100% Real Carbon Fiber Side Plates\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section-center\"\u003e\n      \u003ch2\u003eWilliam Optics 99% Dielectric Dura Bright Diagonal - 1.25\"\u003c\/h2\u003e\n      \u003cp\u003eThe William Optics 1.25\" Dura-Bright Diagonal delivers maximum image brightness and contrast through its 99% reflective dielectric coatings and a precision 1\/12λ mirror. Built on a thermally stable 12mm thick substrate and housed in a patented, permanently aligned chassis with 100% real carbon fiber plates, this diagonal ensures your telescope's optical path remains perfect from the first day of use.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eThe 1\/12λ Mirror: 99% Reflectivity for Maximum Contrast\u003c\/h3\u003e\n      \u003cp\u003eA star diagonal is a critical element in the optical chain, and the Dura-Bright is built around a laboratory-grade mirror. The 12mm thick substrate provides exceptional thermal and mechanical stability, while the surface is polished to a 1\/12λ wave accuracy, preserving the sharpness produced by your telescope's objective. Dielectric coatings provide 99% reflectivity, noticeably brightening the image and increasing contrast on faint deep-sky targets and subtle planetary details like the cloud bands of Jupiter.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003ePatented Design: 100% Carbon Fiber and Permanent Alignment\u003c\/h3\u003e\n      \u003cp\u003eWilliam Optics rejects the idea that a diagonal should ever need user adjustment. Where competing designs use collimation screws—an admission of potential mechanical flexure—the Dura-Bright employs a patented, fixed housing that guarantees perfect alignment for life. The 100% real carbon fiber side plates provide extreme rigidity and a touch of class, while internal baffles eliminate stray light for blacker backgrounds.\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eCompression Rings:\u003c\/strong\u003e Both the 1.25\" eyepiece holder and adapter use brass compression rings to securely grip your eyepieces without marring their barrels.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eGlove-Friendly Screws:\u003c\/strong\u003e Large, knurled thumbscrews are easy to operate even on cold nights while wearing gloves.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eInternal Safety Stop:\u003c\/strong\u003e A machined stop prevents long 1.25\" eyepiece barrels from ever making contact with the diagonal's mirror surface.\u003c\/li\u003e\n      \u003c\/ul\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n    \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eDura-Bright vs. Standard Diagonals: A 5% Gain in Reflectivity\u003c\/h3\u003e\n      \u003cp\u003eCompared to standard aluminum or silver diagonals that typically offer 90-94% reflectivity, the Dura-Bright's 99% dielectric mirror transmits significantly more light to your eye. This 5% or greater increase in light throughput makes a visible difference when observing at the limits of your telescope, rendering faint galaxies brighter and globular clusters more resolved. The dielectric coatings are also far more durable than standard coatings, ensuring this brightness advantage does not degrade over years of use and cleaning.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n\u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the benefit of the William Optics Dura-Bright Diagonal's 99% reflectivity?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe \u003cstrong\u003e99% reflectivity\u003c\/strong\u003e from the dielectric coatings ensures the maximum amount of light from your telescope reaches the eyepiece. This results in brighter images and higher contrast compared to standard diagonals (which are often 90-94% reflective), making faint objects easier to see and planetary details more distinct.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWill the 1.25\" Dura-Bright Diagonal improve my views of Jupiter and Saturn?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes. The combination of high reflectivity and the \u003cstrong\u003e1\/12λ mirror surface\u003c\/strong\u003e preserves the finest details your telescope can resolve. This allows for sharper views of Jupiter’s Great Red Spot, subtle cloud bands, and the Cassini Division in Saturn’s rings, especially when compared to a lower-quality stock diagonal.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhy doesn't the William Optics Dura-Bright Diagonal have collimation screws?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eWilliam Optics considers adjustable alignment systems a sign of poor mechanical design. The Dura-Bright uses a \u003cstrong\u003epatented, rigid, non-adjustable housing\u003c\/strong\u003e to guarantee perfect alignment from the factory that will not shift over time. This ensures consistent, optimal performance without the need for user adjustment.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eIs the carbon fiber on the Dura-Bright Diagonal just for aesthetics?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eWhile the \u003cstrong\u003e100% real carbon fiber\u003c\/strong\u003e side plates are visually striking, their primary purpose is structural. Carbon fiber is exceptionally strong, rigid, and lightweight, contributing to the diagonal's robust, permanently aligned construction.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I use filters with the William Optics 1.25\" Dura-Bright Diagonal?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYou attach standard \u003cstrong\u003e1.25\" threaded filters\u003c\/strong\u003e directly to the barrel of your 1.25\" eyepieces before inserting them into the diagonal. The diagonal itself does not have filter threads.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Dura-Bright Diagonal perform for splitting double stars like Albireo in my 80mm refractor?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eFor a task like splitting the colorful components of Albireo (Beta Cygni), the Dura-Bright excels. Its high-precision \u003cstrong\u003e1\/12λ mirror\u003c\/strong\u003e prevents any degradation of the star's Airy disk, ensuring the tightest possible stars. The high light transmission also helps maintain the brightness and rich color contrast of the binary pair in a smaller 80mm aperture.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003ctable class=\"DAV-specifications\"\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n\u003ctd\u003eDiagonal Size\u003c\/td\u003e\n\u003ctd\u003e1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eViewing Angle\u003c\/td\u003e\n\u003ctd\u003e90°\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eReflectivity\u003c\/td\u003e\n\u003ctd\u003e99%\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMirror Coatings\u003c\/td\u003e\n\u003ctd\u003eDielectric\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMirror Surface Accuracy\u003c\/td\u003e\n\u003ctd\u003e1\/12λ\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMirror Thickness\u003c\/td\u003e\n\u003ctd\u003e12mm\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eSide Plate Material\u003c\/td\u003e\n\u003ctd\u003e100% Real Carbon Fiber\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eAlignment\u003c\/td\u003e\n\u003ctd\u003ePatented Non-Adjustable Design\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eEyepiece Holder\u003c\/td\u003e\n\u003ctd\u003eBrass Compression Ring\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eBaffling\u003c\/td\u003e\n\u003ctd\u003eInternal Anti-Reflection Baffling\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eSafety Feature\u003c\/td\u003e\n\u003ctd\u003eInternal Stop for Eyepiece Barrels\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cul class=\"DAV-grid\"\u003e\n    \u003cli class=\"DAV-grid-item\"\u003e\n      \u003cdiv\u003e\n        \u003cp class=\"DAV-item-title\"\u003e1.25\" Dura Bright Dielectric Diagonal\u003c\/p\u003e\n        \u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/li\u003e\n    \u003cli class=\"DAV-grid-item\"\u003e\n      \u003cdiv\u003e\n        \u003cp class=\"DAV-item-title\"\u003eDust Caps\u003c\/p\u003e\n        \u003cp class=\"DAV-item-subtitle\"\u003e× 2\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/william-optics-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":44967224181021,"sku":"WO-D-125D-C-DB","price":190.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/William-Optics-Dura-Bright-Dielectric-Diagonal-1-25-inch-D-125D-C-DB-1__99095.1596133245.1280.1280.jpg?v=1684339363"},{"product_id":"william-optics-99-dielectric-dura-bright-diagonal-2","title":"William Optics 99% Dielectric Dura Bright Diagonal - 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e2\" Barrel with 90° Viewing Angle\u003c\/li\u003e\n\u003cli\u003e99% Reflectivity Dielectric Coatings\u003c\/li\u003e\n\u003cli\u003e1\/12th Wave Precision Polished Mirror\u003c\/li\u003e\n\u003cli\u003e12mm Thick Mirror Substrate for Thermal Stability\u003c\/li\u003e\n\u003cli\u003e100% Real Carbon Fiber Side Plates\u003c\/li\u003e\n\u003cli\u003eIncludes 2\" to 1.25\" Adapter with Compression Ring\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eWilliam Optics 99% Dielectric Dura Bright Diagonal - 2\"\u003c\/h2\u003e\n\u003cp\u003eThe William Optics 2\" Dura-Bright Diagonal is built around a 12mm thick, 1\/12th wave mirror substrate with 99% reflective dielectric coatings, delivering maximum light transmission for critical observations. Its 90° mirror design is housed in a precision-machined body featuring 100% real carbon fiber side plates, and it includes a 2\" to 1.25\" adapter to accommodate your entire eyepiece collection.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e99% Reflectivity from a 1\/12th Wave Dielectric Mirror\u003c\/h3\u003e\n\u003cp\u003eAt the heart of the Dura-Bright is a mirror polished to a 1\/12th wave accuracy, ensuring that the image remains free of optical errors. This precision flat is supported by a 12mm thick substrate for excellent thermal stability, preventing image shift during temperature changes. The mirror's dielectric coatings achieve 99% reflectivity, providing noticeably brighter images and higher contrast when observing fine details on Jupiter's cloud bands or splitting close binary stars.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eCarbon Fiber Build with Non-Marring Compression Rings\u003c\/h3\u003e\n\u003cp\u003eThe diagonal's body is distinguished by 100% real carbon fiber side plates, reducing weight and adding structural rigidity. Both the 2\" diagonal barrel and the included 1.25\" adapter use brass compression rings, which secure your eyepieces firmly without scratching or marring their barrels. Internally, anti-reflection baffling eliminates stray light, while a safety stop prevents 2\" eyepiece barrels from ever contacting the mirror surface.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003ePatented Design: Permanently Aligned for Life\u003c\/h3\u003e\n\u003cp\u003eUnlike diagonals that require periodic adjustment, the William Optics Dura-Bright is engineered to hold its collimation permanently. A non-adjustable design is a testament to its mechanical integrity; the diagonal is CNC-machined from a solid block of aluminum to guarantee its optical axis remains perfectly aligned from the first day of use. This robust construction ensures your telescope's optical train remains precise, session after session.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the advantage of the William Optics Dura-Bright's 99% dielectric coating?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e99% dielectric coating\u003c\/strong\u003e ensures that virtually all light gathered by your telescope reaches your eyepiece. This results in brighter, higher-contrast images compared to standard aluminum or silver coatings, which is especially critical for observing faint planetary details, deep-sky objects, and the subtle color differences in stars.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy doesn't the William Optics Dura-Bright diagonal have collimation screws?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe absence of collimation screws is a design feature, not a limitation. William Optics builds the Dura-Bright diagonal with such high mechanical precision that it is guaranteed to hold its alignment permanently. Diagonals that offer adjustments often do so because their construction is less robust and can shift over time; the Dura-Bright's patented, solid design eliminates this possibility.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Dura-Bright diagonal scratch my eyepiece barrels?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. Both the main 2\" holder and the included 1.25\" adapter use \u003cstrong\u003ebrass compression rings\u003c\/strong\u003e. Unlike simple lock screws that dig into the eyepiece barrel, a compression ring provides a secure, even grip around the entire barrel, preventing any cosmetic damage or marring.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 12mm thick mirror in the Dura-Bright help when observing Jupiter with my FLT-132?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e12mm thick mirror substrate\u003c\/strong\u003e provides superior thermal stability. When observing an object like Jupiter for an extended period, especially as your telescope adjusts to ambient temperature, a thinner mirror could slightly deform and soften the image. The Dura-Bright's thick mirror resists these changes, ensuring your view of the Great Red Spot and its cloud bands remains sharp and stable all night.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use 1.25\" eyepieces with the 2\" William Optics Dura-Bright diagonal?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, absolutely. The diagonal comes with a high-quality \u003cstrong\u003e2\" to 1.25\" adapter\u003c\/strong\u003e. This adapter also features a compression ring, so your 1.25\" eyepieces are held just as securely and safely as your 2\" eyepieces.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Dura-Bright a good choice for splitting close double stars like Epsilon Lyrae with a GT102?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it's an excellent choice. Splitting tight doubles like the \"Double Double\" Epsilon Lyrae requires maximum image contrast and sharpness. The Dura-Bright's \u003cstrong\u003e1\/12th wave mirror\u003c\/strong\u003e and \u003cstrong\u003e99% reflectivity coatings\u003c\/strong\u003e preserve the delicate Airy disk and diffraction rings of the stars, making it easier to achieve a clean separation at high magnification with a high-end refractor like the GT102.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eViewing Angle\u003c\/td\u003e\n\u003ctd\u003e90°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMirror Type\u003c\/td\u003e\n\u003ctd\u003eDura-Bright Dielectric\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReflectivity\u003c\/td\u003e\n\u003ctd\u003e99%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMirror Substrate Thickness\u003c\/td\u003e\n\u003ctd\u003e12mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMirror Flatness\u003c\/td\u003e\n\u003ctd\u003e1\/12th wave\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSide Plate Material\u003c\/td\u003e\n\u003ctd\u003e100% Real Carbon Fiber\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClamping Mechanism\u003c\/td\u003e\n\u003ctd\u003eBrass Compression Rings\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBaffling\u003c\/td\u003e\n\u003ctd\u003eInternal Anti-Reflection Baffling\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSafety Feature\u003c\/td\u003e\n\u003ctd\u003eInternal Barrel Stop\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAdapter Included\u003c\/td\u003e\n\u003ctd\u003e2\" to 1.25\" with Compression Ring\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eWilliam Optics 2\" 99% Dielectric Dura Bright Diagonal\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e2\" to 1.25\" Eyepiece Adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/william-optics-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":44967224213789,"sku":"WO-D-DIG2D-C-DB","price":228.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/William-Optics-2-inch-Durabright-CF-Plate-D-DIG2D-C-DB-T-1__49229.1642255347.1280.1280.jpg?v=1684339370"},{"product_id":"william-optics-45-erecting-prism-1-25","title":"William Optics 45° Erecting Prism - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eProvides a fully corrected image (upright and left-right correct)\u003c\/li\u003e\n\u003cli\u003eComfortable 45° viewing angle for terrestrial observation\u003c\/li\u003e\n\u003cli\u003eFits standard 1.25\" focusers and accepts 1.25\" eyepieces\u003c\/li\u003e\n\u003cli\u003eHigh-quality BAK7 prism with anti-reflection coatings\u003c\/li\u003e\n\u003cli\u003eFeatures a non-marring brass compression ring to protect eyepieces\u003c\/li\u003e\n\u003cli\u003eDurable, internally baffled black-anodized aluminum body\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eWilliam Optics 45° Erecting Prism - 1.25\"\u003c\/h2\u003e\n\u003cp\u003eThe William Optics 45° Erecting Prism transforms any astronomical telescope with a 1.25\" focuser into a powerful terrestrial scope for daytime viewing. It reorients the standard inverted and reversed image, delivering a view that is fully upright and corrected left-to-right, just as your eyes see it naturally. With its high-quality BAK7 prism and anti-reflection coatings, this diagonal provides the bright, high-contrast images necessary for birdwatching, landscape viewing, or maritime observation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eFrom Astronomical to Terrestrial: A Fully Corrected 1.25\" View\u003c\/h3\u003e\n\u003cp\u003eA standard telescope view is upside-down and backwards, which is disorienting for observing anything on Earth. This 1.25\" erecting prism solves that problem completely. It provides a \"correct-image\" orientation, making it intuitive to follow moving targets like birds in flight or boats on the water.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eBAK7 Prism Optics: Bright, High-Contrast Daytime Images\u003c\/h3\u003e\n\u003cp\u003eAt the heart of this diagonal is a large, high-quality BAK7 prism. Paired with anti-reflection coatings, it maximizes light throughput for exceptionally bright views. To ensure high contrast and prevent washed-out images, the interior of the aluminum housing is fully blackened and baffled to eliminate stray light reflections before they reach your eyepiece.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eSecure by Design: Anodized Aluminum and a Brass Compression Ring\u003c\/h3\u003e\n\u003cp\u003eThe William Optics erecting prism is built for durability and ease of use. The body is machined from black-anodized aluminum, and the 1.25\" eyepiece holder features a non-marring brass compression ring. This design ensures your eyepiece barrels are held securely without the scratches and gouges caused by single-thumbscrew systems. Large, chromed thumbscrews make it easy to secure your eyepieces, even when wearing gloves.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e45° vs. 90° Diagonals: Choosing the Right Tool for the Job\u003c\/h3\u003e\n\u003cp\u003eWhile a standard 90° star diagonal is ideal for astronomy, its image is still reversed left-to-right. This 45° erecting prism provides a fully correct image, making it superior for terrestrial use. The 45° angle is also more comfortable for viewing subjects on or near the horizon, whereas a 90° angle becomes awkward. For daytime use, the 45° erecting prism is the correct choice; for nighttime astronomical viewing, a 90° star diagonal remains the standard.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy do I need the William Optics 45° Erecting Prism for daytime viewing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAstronomical telescopes naturally produce an image that is upside-down and backward. While this doesn't matter for stars, it makes viewing terrestrial objects impossible to follow. The \u003cstrong\u003eWilliam Optics 45° Erecting Prism\u003c\/strong\u003e corrects the image to be both upright and normal left-to-right, making your telescope function like a high-power spotting scope.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this William Optics prism work with my Schmidt-Cassegrain or reflector telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis prism is primarily designed for refractors and Maksutov-Cassegrain telescopes. While it will fit in the 1.25\" focuser of a Schmidt-Cassegrain (SCT) or Newtonian reflector, you may not have enough focuser travel to reach a sharp image. Refractors are generally the best match for this type of diagonal.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the difference between this 45° erecting prism and a standard 90° star diagonal?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThere are two key differences:\n\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eImage Orientation:\u003c\/strong\u003e A 90° star diagonal corrects the up\/down orientation but leaves the image mirrored left-to-right. This 45° prism corrects \u003cstrong\u003eboth\u003c\/strong\u003e axes, providing a fully correct image.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eViewing Angle:\u003c\/strong\u003e The 45° angle is more comfortable for looking at objects on the horizon. The 90° angle is better for looking high into the night sky.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the brass compression ring on the WO-D-EP125 do?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003ebrass compression ring\u003c\/strong\u003e is a soft metal ring inside the eyepiece holder that tightens evenly around your eyepiece barrel when you turn the thumbscrew. This provides a secure, centered grip without scratching or marring the eyepiece barrel, unlike a simple set screw that digs into one point.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the William Optics 45° prism for birdwatching with my 80mm refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. An 80mm refractor paired with this erecting prism makes an excellent, high-magnification setup for birdwatching. The fully corrected image allows you to easily track birds, and the optical quality of the BAK7 prism ensures you'll see fine feather detail with bright, clear views.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this prism affect focusing on my telescope when viewing ships from my balcony?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, all diagonals change the focus point of a telescope. The William Optics 45° prism will require you to move the focuser \"out\" (away from the telescope tube) to reach focus compared to viewing without a diagonal. Most refractors have ample focuser travel to accommodate this without any issue.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiagonal Type\u003c\/td\u003e\n\u003ctd\u003eErecting Prism\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eViewing Angle\u003c\/td\u003e\n\u003ctd\u003e45°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Orientation\u003c\/td\u003e\n\u003ctd\u003eFully Corrected (Upright \u0026amp; Left-Right Correct)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrism Material\u003c\/td\u003e\n\u003ctd\u003eBAK7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Coatings\u003c\/td\u003e\n\u003ctd\u003eAnti-Reflection Coated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Construction\u003c\/td\u003e\n\u003ctd\u003eBlack Anodized Aluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInterior\u003c\/td\u003e\n\u003ctd\u003eBaffled and Blackened\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEyepiece Holder\u003c\/td\u003e\n\u003ctd\u003e1.25\" with Brass Compression Ring\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eWilliam Optics 45° Erecting Prism - 1.25\"\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/william-optics-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":44967224246557,"sku":"WO-D-EP125","price":152.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/William-Optics-45-degree-Erecting-Prism-1-25-inch-D-EP125-1__94579.1596133249.1280.1280.jpg?v=1684339395"},{"product_id":"william-optics-redcat-erecting-prism-1-25-silver-version","title":"William Optics RedCat WIFD Erecting Prism - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eConverts Astronomical Telescopes for Terrestrial Viewing\u003c\/li\u003e\n\u003cli\u003e90-Degree Viewing Angle\u003c\/li\u003e\n\u003cli\u003eAccepts Standard 1.25\" Eyepieces\u003c\/li\u003e\n\u003cli\u003eAnti-Reflection Coated BAK7 Prism\u003c\/li\u003e\n\u003cli\u003eCNC-Machined 6061T Aluminum Housing\u003c\/li\u003e\n\u003cli\u003eInternally Baffled and Matte Blackened to Maximize Contrast\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eWilliam Optics RedCat WIFD Erecting Prism - 1.25\"\u003c\/h2\u003e\n\u003cp\u003eThe William Optics RedCat WIFD Erecting Prism transforms your astronomical telescope into a powerful daytime spotting scope with its 90-degree, correct-image light path. Designed to fit any standard 1.25-inch focuser, this prism uses an anti-reflection coated BAK7 prism to deliver bright, sharp, and correctly oriented views, making it ideal for terrestrial observation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eCorrect-Image Daytime Viewing with a 90-Degree BAK7 Prism\u003c\/h3\u003e\n\u003cp\u003eAn astronomical telescope naturally produces an inverted or mirror-reversed image, which is disorienting for terrestrial subjects. This 90-degree erecting prism corrects the image orientation both vertically and horizontally, allowing you to view ships on the horizon, wildlife, or distant landscapes as you would with your own eyes. The internal BAK7 prism is anti-reflection coated to ensure high light transmission for a clear and vibrant image.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eCNC-Machined 6061T Aluminum Construction\u003c\/h3\u003e\n\u003cp\u003eReflecting William Optics' commitment to quality, the entire prism housing is precision CNC-machined from a solid block of 6061T aluminum. The interior is matte blackened and threaded to absorb stray light, preventing internal reflections from reducing image contrast. Finished in the distinctive William Optics red anodizing, this erecting prism is built to provide durable, high-fidelity performance that perfectly complements the RedCat 51 WIFD and other premium refractors.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the William Optics 1.25\" Erecting Prism do for my RedCat 51?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis prism converts your RedCat 51, or any telescope with a 1.25\" focuser, into a terrestrial spotting scope. It corrects the inverted and reversed image produced by the telescope, providing a view that is correctly oriented for daytime activities like birdwatching, nature observation, or surveillance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use this William Optics prism for astronomy at night?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile you can use it for casual stargazing, an erecting prism is not ideal for critical astronomical observation. The complex light path required to correct the image can introduce minor aberrations and light loss compared to a high-quality mirror or Amici prism star diagonal. For the best possible astronomical views, a dedicated star diagonal is recommended.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will this 90-degree prism help with birdwatching using my RedCat 51 telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor birdwatching, having a correctly oriented image is essential for tracking moving subjects. This 90-degree prism ensures that when you move the telescope up, the view moves up, and when you move it left, the view moves left. This intuitive control allows you to follow birds in flight or locate them in dense foliage much more easily than with an astronomical diagonal.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the difference between this erecting prism and a standard star diagonal?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA standard \u003cstrong\u003estar diagonal\u003c\/strong\u003e corrects the image vertically but leaves it mirror-reversed (left-to-right). This is acceptable for astronomy but confusing for terrestrial viewing. An \u003cstrong\u003eerecting prism\u003c\/strong\u003e, like this one, corrects the image on both axes, providing a fully correct, daytime-friendly view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI want to use my William Optics RedCat 51 for plane spotting. Is this the right accessory?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this is an excellent accessory for plane spotting. The fully corrected image allows you to track aircraft across the sky intuitively, and the 90-degree angle provides a comfortable viewing position when the telescope is pointed at high altitudes. The high-contrast optics will help you resolve details and airline liveries clearly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the William Optics Erecting Prism compatible with non-William Optics telescopes?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. This erecting prism uses a standard 1.25\" barrel, making it compatible with any telescope that accepts 1.25\" eyepieces and diagonals. You will just need to ensure your focuser has enough travel to reach focus with the prism in the optical train.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eErecting Prism\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eViewing Angle\u003c\/td\u003e\n\u003ctd\u003e90-Degree\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrism Material\u003c\/td\u003e\n\u003ctd\u003eBAK7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eAnti-Reflection Coated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHousing Material\u003c\/td\u003e\n\u003ctd\u003eCNC-Machined 6061T Aluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFinish\u003c\/td\u003e\n\u003ctd\u003eRed Anodized\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInterior\u003c\/td\u003e\n\u003ctd\u003eMatte Blackened \u0026amp; Threaded\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Use\u003c\/td\u003e\n\u003ctd\u003eDaytime Terrestrial Observation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eDesigned for RedCat 51 WIFD, compatible with all 1.25\" focusers\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eWilliam Optics RedCat WIFD Erecting Prism - 1.25\"\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e1.25\" Dust Cap\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eEyepiece Dust Cap\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/william-optics-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":44967224443165,"sku":"WO-D-EP90-125-RC51III","price":219.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/William-Optics-RedCat-Erecting-Prism-1-25-inch-Silver-Version-D-EP90-125-RC51-SL-1__00946.1596133250.1280.1280.jpg?v=1684339157"},{"product_id":"william-optics-90-erect-prism-1-25","title":"William Optics 90° Erect Prism - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eProvides a fully corrected, upright, and non-reversed image\u003c\/li\u003e\n\u003cli\u003eDesigned for 1.25\" focusers and eyepieces\u003c\/li\u003e\n\u003cli\u003e90° viewing angle for comfortable observing\u003c\/li\u003e\n\u003cli\u003eIntegrated helical focuser for fine adjustments\u003c\/li\u003e\n\u003cli\u003eThreaded to accept standard 1.25\" filters\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eWilliam Optics 90° Erect Prism - 1.25\"\u003c\/h2\u003e\n\u003cp\u003eThe William Optics 90° Erect Prism corrects the image orientation in any 1.25\" focuser, making your astronomical refractor a superb terrestrial telescope. This BAK7 prism design provides an upright, non-reversed view at a comfortable 90° angle, a critical feature for daytime observation that standard mirror diagonals cannot offer.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA 90° Erecting Prism for Correct-Image Views\u003c\/h3\u003e\n\u003cp\u003eA standard astronomical telescope inverts the image. This William Optics diagonal uses a high-accuracy BAK7 erecting prism to flip the image both vertically and horizontally, producing a view that matches what you see with your naked eye. This is essential for birdwatching, landscape viewing, or any terrestrial application where a true-to-life orientation is required.\u003c\/p\u003e\n\u003cp\u003eThe prism features anti-reflection coatings to maximize light transmission, while the interior of the housing is matte blackened to eliminate stray light reflections. The result is a high-contrast image that makes this diagonal a perfect match for premium refractors.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eHelical Focuser and 1.25\" Filter Threads\u003c\/h3\u003e\n\u003cp\u003eA key feature of this diagonal is the integrated helical focuser on the eyepiece holder. This mechanism allows for fine, precise focus adjustments without touching your telescope's main focuser, which is ideal for achieving critical sharpness at high magnification or for matching focus between different eyepieces.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurable Construction:\u003c\/strong\u003e The body is machined from black anodized aluminum, ensuring a rigid and durable connection in your optical train.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilter Compatibility:\u003c\/strong\u003e The 1.25\" nosepiece is threaded to accept standard 1.25\" filters, allowing you to easily add a moon filter or color filter for planetary viewing.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eWilliam Optics Erecting Prism vs. Standard Mirror Diagonals\u003c\/h3\u003e\n\u003cp\u003eFor astronomical use, a high-end dielectric mirror diagonal may offer marginally higher light transmission, making it preferable for imaging faint deep-sky objects. However, a mirror diagonal only corrects the up-down axis, leaving the image reversed left-to-right.\u003c\/p\u003e\n\u003cp\u003eFor any application where image orientation matters, the erecting prism is the superior tool. Whether you're tracking a ship on the horizon or using your telescope for public outreach, the William Optics 90° Erect Prism delivers an intuitive, correctly oriented view that mirrors reality.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy do I need the William Optics 90° Erect Prism for daytime viewing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eStandard astronomical diagonals produce an image that is either upside-down or mirrored left-to-right. The \u003cstrong\u003eWilliam Optics 90° Erect Prism\u003c\/strong\u003e corrects the image on both axes, giving you a fully upright and non-reversed view, just like a pair of binoculars. This is essential for terrestrial applications like birdwatching or landscape observation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the helical focuser on the William Optics Erect Prism work?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe top barrel of the diagonal, where you insert the eyepiece, can be rotated. This rotation moves the eyepiece up and down with very fine precision, allowing you to make small, critical focus adjustments. It's especially useful for fine-tuning focus at high power or when swapping eyepieces that are not perfectly parfocal.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the William Optics 1.25\" Erect Prism work with my Schmidt-Cassegrain telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this prism diagonal will work perfectly with any Schmidt-Cassegrain (SCT), Maksutov-Cassegrain, or refractor that uses a 1.25\" visual back or focuser. It provides a comfortable 90° viewing angle and a correctly oriented image, making it a versatile accessory for any compatible telescope.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use 1.25\" filters like a moon filter with this William Optics prism?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The 1.25\" nosepiece that inserts into the telescope's focuser is threaded to accept all standard 1.25\" filters. You can easily attach a moon filter, planetary color filters, or a light pollution filter.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat's the difference between this William Optics Erecting Prism and a mirror diagonal?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAn \u003cstrong\u003eErecting Prism\u003c\/strong\u003e provides a fully corrected image (upright and not reversed left-to-right), which is ideal for daytime use. A \u003cstrong\u003eMirror Diagonal\u003c\/strong\u003e provides an image that is upright but still reversed left-to-right. While a high-quality mirror may have slightly better light transmission for deep-sky astronomy, the prism is the correct choice for terrestrial viewing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs this prism a good choice for observing planets like Jupiter in my premium refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile this prism will certainly show you planets, a high-quality dielectric mirror diagonal is generally recommended for critical planetary observation. Mirror diagonals tend to have slightly higher light throughput and introduce fewer optical artifacts than a prism, preserving the maximum possible contrast for viewing details like the cloud bands of Jupiter (M42) or the Cassini Division in Saturn's rings.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eViewing Angle\u003c\/td\u003e\n\u003ctd\u003e90°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Orientation\u003c\/td\u003e\n\u003ctd\u003eErect (Upright \u0026amp; Non-Reversed)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrism Type\u003c\/td\u003e\n\u003ctd\u003eBAK7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eAnti-Reflection Coated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003eIntegrated Helical Focuser\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Material\u003c\/td\u003e\n\u003ctd\u003eBlack Anodized Aluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInternal Baffling\u003c\/td\u003e\n\u003ctd\u003eMatte Blackened\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Threads\u003c\/td\u003e\n\u003ctd\u003eYes (1.25\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eWilliam Optics 90° Erect Prism - 1.25\"\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/william-optics-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":44967224803613,"sku":"WO-D-EP90-125II","price":160.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/William-Optics-90-degree-Erect-Prism-1-25-inch-D-EP90-125II-1__05101.1596133252.1280.1280.jpg?v=1684339397"},{"product_id":"baader-maxbright-amici-prism-1-25w-integral-2x-glasspath-corrector","title":"Baader Maxbright Amici Prism 1.25\"w\/ Integral 2X Glasspath Corrector","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eProvides a fully corrected, erect image for terrestrial viewing\u003c\/li\u003e\n\u003cli\u003eDesigned for the Baader Maxbright Binoviewer\u003c\/li\u003e\n\u003cli\u003eStandard 1.25\" barrel format\u003c\/li\u003e\n\u003cli\u003eIntegrated 2X Glasspath Corrector ensures focus can be reached\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section-center\"\u003e\n      \u003ch2\u003eBaader Maxbright Amici Prism 1.25\" w\/ Integral 2X Glasspath Corrector\u003c\/h2\u003e\n      \u003cp\u003eThe Baader Maxbright Amici Prism is a dedicated optical component designed to solve two common challenges with binoviewing: it provides a fully corrected, daytime-friendly image and its integrated 2X Glasspath Corrector ensures your binoviewer can reach focus in telescopes with limited back-focus. This 1.25\" prism is the ideal solution for turning your astronomical telescope into a high-power terrestrial spotting scope for use with the Maxbright Binoviewer.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eErect-Image Views with the 1.25\" Amici Design\u003c\/h3\u003e\n      \u003cp\u003eUnlike standard star diagonals which produce an image that is upright but reversed left-to-right, an Amici prism delivers a completely correct orientation. This makes navigating the lunar surface or tracking moving terrestrial targets like birds or ships intuitive. The 1.25\" barrel fits directly into your telescope's focuser, serving as the diagonal for your Maxbright binoviewer setup.\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eTerrestrial Viewing:\u003c\/strong\u003e The fully erect image makes the Maxbright Amici Prism essential for daytime observation, transforming your telescope into a powerful binocular spotting scope.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eAstronomical Use:\u003c\/strong\u003e While excellent for casual lunar and wide-field stargazing, the roof-edge design of an Amici prism can introduce a faint diffraction spike on the brightest point-sources like Vega or Jupiter. For critical planetary observation, a traditional prism or mirror diagonal is often preferred.\u003c\/li\u003e\n      \u003c\/ul\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eThe Integrated 2X GPC for Focus and Magnification\u003c\/h3\u003e\n      \u003cp\u003eMany telescopes, especially Newtonians, do not have enough inward focuser travel to accommodate the long light path of a binoviewer. The integrated 2X Glasspath Corrector (GPC) solves this by extending the telescope's focal plane outwards, pushing the focus point to where the binoviewer's eyepieces can reach it. This component also doubles the effective focal length of your telescope, providing higher magnification views that are ideal for detailed lunar and planetary observation.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n\u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main purpose of the Baader Maxbright Amici Prism?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eIts primary purpose is to provide a \u003cstrong\u003efully corrected, erect image\u003c\/strong\u003e (upright and not reversed left-to-right) when using the Baader Maxbright Binoviewer. This is essential for terrestrial, daytime viewing and makes navigating the Moon's surface more intuitive. It also includes an integrated \u003cstrong\u003e2X Glasspath Corrector\u003c\/strong\u003e to help the binoviewer reach focus.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWill this 2X Glasspath Corrector allow my Maxbright Binoviewer to reach focus in my Newtonian telescope?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes, this is precisely what the integrated 2X Glasspath Corrector is for. Newtonian reflectors typically have very little back-focus, and a binoviewer alone will not reach focus. The GPC extends the focal plane, making it possible to achieve a sharp image with the Maxbright Binoviewer in most Newtonians.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Baader Maxbright Amici Prism good for high-power planetary viewing of Jupiter?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eWhile it can be used, it's not the optimal choice for critical planetary viewing. The \"roof\" design of an Amici prism can create a very faint diffraction spike on extremely bright objects like Jupiter, which may slightly soften the finest details. For the highest-contrast planetary views, a dedicated mirror diagonal or a standard prism diagonal (like the Baader T-2 Zeiss Prism) is generally recommended.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use this Baader Amici Prism without the Maxbright Binoviewer, as a standard diagonal?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eNo, this unit is designed as an integrated system for the Maxbright Binoviewer. The Glasspath Corrector's optical properties are calculated to work with the light path of the binoviewer. Using it with a single eyepiece would result in a 2X Barlow effect, but it is not optimized for that application.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhy does this Baader prism provide a \"correct\" image?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eIt uses an \u003cstrong\u003eAmici roof prism\u003c\/strong\u003e design. Unlike a simple 90-degree prism or mirror that flips the image once, the roof-shaped surface in an Amici prism introduces an additional reflection. This second reflection corrects the left-right reversal, resulting in an image that matches what you see with your naked eye.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the integrated 2X Glasspath Corrector in the Amici Prism affect image brightness?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes, any time you increase magnification, you concentrate the same amount of light over a larger area, which makes the resulting image dimmer. The 2X magnification will result in an image that is four times dimmer than the view at 1X. This is a fundamental principle of optics and applies to any Barlow lens or Glasspath Corrector.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrism Type\u003c\/td\u003e\n\u003ctd\u003eAmici Roof Prism\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCorrector Factor\u003c\/td\u003e\n\u003ctd\u003e2X\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Orientation\u003c\/td\u003e\n\u003ctd\u003eErect, Fully Corrected\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eBaader Maxbright Binoviewer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet weight (kg)\u003c\/td\u003e\n\u003ctd\u003e0.10\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDeflection angle\u003c\/td\u003e\n\u003ctd\u003e45°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAR-Coating\u003c\/td\u003e\n\u003ctd\u003eMulti-Coated (MC)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClamping System\u003c\/td\u003e\n\u003ctd\u003eno clamp\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Diameter \/ Clear Aperture (mm)\u003c\/td\u003e\n\u003ctd\u003e25\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical length (mm)\u003c\/td\u003e\n\u003ctd\u003evariabel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Connection (eyepiece\/-camera-sided)\u003c\/td\u003e\n\u003ctd\u003eM42 x 0.75 (T-2)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Connection (lens sided)\u003c\/td\u003e\n\u003ctd\u003eM28.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Connection (lens sided)\u003c\/td\u003e\n\u003ctd\u003eø 1¼\" (31.75 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eErecting Prism\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReflection surface\u003c\/td\u003e\n\u003ctd\u003eTotal reflection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cul class=\"DAV-grid\"\u003e\n    \u003cli class=\"DAV-grid-item\"\u003e\n      \u003cdiv\u003e\n        \u003cp class=\"DAV-item-title\"\u003eMaxbright Amici Prism 1.25\" w\/ Integral 2X Glasspath Corrector\u003c\/p\u003e\n        \u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader_Planetarium_MaxBright_II_Binoviewer_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBaader Planetarium MaxBright II Binoviewer Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader_Planetarium_Star_Diagonals_T-2_and_2in_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBaader Planetarium Star Diagonals T-2 and 2in Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/baader-planetarium-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eBaader Planetarium Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Baader Planetarium","offers":[{"title":"Default Title","offer_id":44967300170013,"sku":"BAA-2956155","price":139.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Baader-Maxbright-Amici-Prism-1-25-inchwith-Integral-2X-Glasspath-Corrector-for-Maxbright-Binoviewer-1__10040.1597110522.1280.1280.jpg?v=1684340109"},{"product_id":"baader-90-astro-grade-amici-prism-w-bbhs-coating-t-2","title":"Baader 90° Astro-Grade Amici Prism w\/ BBHS Coating - T-2","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e90° comfortable viewing angle\u003c\/li\u003e\n\u003cli\u003eAmici prism design provides correctly oriented, erect images\u003c\/li\u003e\n\u003cli\u003eFeatures a full 1.25\" clear aperture to prevent vignetting\u003c\/li\u003e\n\u003cli\u003eBaader BBHS® coatings for maximum image brightness and contrast\u003c\/li\u003e\n\u003cli\u003eDual T-2 (M42x0.75) threads for direct, secure connections\u003c\/li\u003e\n\u003cli\u003eSolid metal body ensures precise optical alignment\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eBaader 90° Astro-Grade Amici Prism w\/ BBHS Coating - T-2\u003c\/h2\u003e\n\u003cp\u003eThe Baader 90° Astro-Grade Amici Prism delivers correctly oriented, right-side-up images through a full 1.25-inch clear aperture, making it an essential tool for high-power terrestrial, nature, and white-light solar observing where intuitive image orientation is critical.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e90° Correct-Image Views with a Full 1.25\" Aperture\u003c\/h3\u003e\n\u003cp\u003eUnlike a standard star diagonal that corrects the image up-down but leaves it reversed left-right, an Amici prism provides a fully correct, erect image. This makes navigating a landscape or tracking a moving target feel completely natural. Baader's \"Astro-Grade\" designation signifies this prism is manufactured to a higher optical standard than typical terrestrial prisms, ensuring sharp, detailed views worthy of a high-quality telescope. Its full 1.25\" clear aperture guarantees that even your widest-field 1.25\" eyepieces are fully illuminated without vignetting.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eBBHS® Coatings for High-Contrast Terrestrial and Solar Observing\u003c\/h3\u003e\n\u003cp\u003eThis prism features Baader's proprietary BBHS® (Broadband Hard-Coated Silver) coatings. This advanced silver coating provides exceptionally high reflectivity across the visual spectrum, resulting in a noticeably brighter and higher-contrast image compared to prisms with standard aluminum coatings. The entire optical element is housed in a solid metal body, which maintains perfect alignment and ensures a lifetime of reliable use in the field.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eDual T-2 Threads: An Ultra-Short, Adaptable Prism Body\u003c\/h3\u003e\n\u003cp\u003eEngineered for maximum adaptability, this Amici prism features T-2 (M42x0.75) threads on both the telescope and eyepiece sides. This allows for a direct, secure, and flexure-free connection within the extensive Baader T-2 Astro-System. The \"extremely short\" body design minimizes the optical path length, making it easier to reach focus in a wide variety of telescopes and accessory configurations, from spotting scopes to refractors.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the primary use for the Baader T-2 Amici Prism?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Baader 90° Amici Prism is designed for applications where a fully corrected, non-reversed image is essential. This makes it ideal for \u003cstrong\u003eterrestrial and nature observing\u003c\/strong\u003e, as well as for \u003cstrong\u003ewhite-light solar viewing\u003c\/strong\u003e with an appropriate main-objective filter. The correct image orientation allows for intuitive panning and tracking of moving objects.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Baader Amici Prism suitable for astronomical deep-sky imaging or observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile it can be used, it's not the optimal choice for critical deep-sky observing. Amici prisms inherently have a very faint dividing line (the \"roof edge\") that can be visible on bright stars or extended objects at high magnification. For astronomical use, a high-quality mirror or standard prism diagonal like the Baader T-2 Zeiss Prism Diagonal will provide a slightly higher-contrast view without this artifact.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do the T-2 threads on the Baader Amici Prism work?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe T-2 threads (M42x0.75) on both sides of the prism body allow it to be integrated directly into a modular system of accessories. You can thread on T-2 to 1.25\" eyepiece holders, camera adapters, or extension tubes for a rigid, secure connection that avoids the potential for tilt or slop from traditional slip-fit accessories.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat makes the BBHS® coating on this Baader prism special?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eBBHS® stands for Broadband Hard-Coated Silver. Unlike standard aluminum coatings, this advanced silver coating provides very high, uniform reflectivity across the entire visual spectrum. This results in a brighter image with more neutral color balance and enhanced contrast, which is especially beneficial for discerning subtle details during daytime observing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Baader 90° Amici Prism for daytime birdwatching with my apochromatic refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. This is a perfect application for this prism. Pairing it with a high-quality refractor turns your astronomy telescope into a world-class spotting scope. The \"Astro-Grade\" optics will preserve the sharpness of your telescope, and the correct image orientation makes following birds in flight effortless.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Baader Amici Prism's 1.25\" aperture cause vignetting with my Tele Vue 24mm Panoptic eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. The Baader Amici Prism is designed with a \"full 1.25\" aperture,\" meaning it has a clear opening large enough to illuminate the maximum field stop of the 1.25\" format. The 24mm Panoptic, which has one of the largest field stops available in a 1.25\" eyepiece, will be fully illuminated without any dimming at the edges of the field.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrism Type\u003c\/td\u003e\n\u003ctd\u003e90° Astro-Grade Amici Prism\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Orientation\u003c\/td\u003e\n\u003ctd\u003eErect, non-reversed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClear Aperture\u003c\/td\u003e\n\u003ctd\u003e1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eBaader BBHS® (Broadband Hard-Coated Silver)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Construction\u003c\/td\u003e\n\u003ctd\u003eSolid Metal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTelescope Connection\u003c\/td\u003e\n\u003ctd\u003eT-2 (M42x0.75) Female Thread\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEyepiece Connection\u003c\/td\u003e\n\u003ctd\u003eT-2 (M42x0.75) Female Thread\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet weight (kg)\u003c\/td\u003e\n\u003ctd\u003e0.25\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrism Glass (Type)\u003c\/td\u003e\n\u003ctd\u003eBaK-4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAR-Coating\u003c\/td\u003e\n\u003ctd\u003ePhantom Coating® Group\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClamping System\u003c\/td\u003e\n\u003ctd\u003eno clamp\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Diameter \/ Clear Aperture (mm)\u003c\/td\u003e\n\u003ctd\u003e31\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical length (mm)\u003c\/td\u003e\n\u003ctd\u003e47.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Connection (eyepiece\/-camera-sided)\u003c\/td\u003e\n\u003ctd\u003eM34\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eErecting Prism\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReflection surface\u003c\/td\u003e\n\u003ctd\u003eSealed BBHS coating\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGlas path\u003c\/td\u003e\n\u003ctd\u003e50 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003cp style=\"text-align: center;\"\u003eThis product consists of the prism body only. Eyepiece holders and telescope adapters are sold separately.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader_Planetarium_Cleaning_and_Maintenance_of_Optics_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBaader Planetarium Cleaning and Maintenance of Optics Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader_Planetarium_Astro_T-2_System_Connections_Overview.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBaader Planetarium Astro T-2 System Connections Overview\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader_Planetarium_Star_Diagonals_T-2_and_2in_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBaader Planetarium Star Diagonals T-2 and 2in Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader_Planetarium_Astro_T-2_System_Parts_List.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBaader Planetarium Astro T-2 System Parts List\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/baader-planetarium-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eBaader Planetarium Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Baader Planetarium","offers":[{"title":"Default Title","offer_id":44967300366621,"sku":"BAA-2456130","price":430.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Baader-90-degree-Astro-Grade-Amici-Prism-with-BBHS-Coating-T-2-1__82558.1597110529.1280.1280.jpg?v=1684340148"},{"product_id":"baader-90-astro-grade-amici-prism-w-bbhs-coating-2-clicklock","title":"Baader 90° Astro-Grade Amici Prism w\/ BBHS Coating - 2\" ClickLock","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eProvides a fully corrected, non-reversed and non-inverted image\u003c\/li\u003e\n\u003cli\u003eComfortable 90° viewing angle\u003c\/li\u003e\n\u003cli\u003eFull 2-inch clear aperture prevents vignetting\u003c\/li\u003e\n\u003cli\u003eBaader BBHS® hard-silver coatings for maximum brightness and durability\u003c\/li\u003e\n\u003cli\u003eFeatures the Baader 2-inch ClickLock eyepiece clamp for secure, centered holding\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eBaader 90° Astro-Grade Amici Prism w\/ BBHS Coating - 2\" ClickLock\u003c\/h2\u003e\n\u003cp\u003eThe Baader 90° Astro-Grade Amici Prism provides fully corrected images at a comfortable 90° viewing angle. Its full 2-inch aperture and advanced BBHS® coatings ensure maximum brightness for both daytime nature observation and nighttime astronomical use.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eCorrectly Oriented Views: The 90° Astro-Grade Amici Prism\u003c\/h3\u003e\n\u003cp\u003eUnlike a standard star diagonal that shows a mirror-reversed image, an Amici prism corrects the view in both axes, delivering an image that is upright and true-to-life. This makes the Baader 90° Amici Prism ideal for terrestrial observation with an astronomical telescope, turning your instrument into a high-power spotting scope. The \"Astro-Grade\" designation signifies high-precision manufacturing, which minimizes the central diffraction spike inherent in simpler Amici designs, preserving image contrast for astronomical targets.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eBBHS® Coatings on a 2-inch Prism: Uncompromised Brightness\u003c\/h3\u003e\n\u003cp\u003eThis prism features Baader's Broadband Hard-Silver (BBHS®) coating on its reflective surfaces. This advanced dielectric-protected silver coating provides exceptionally high reflectivity across the entire visual spectrum, resulting in brighter, higher-contrast images than diagonals with standard aluminum or simple silver coatings. The hard-silver coating is also incredibly durable, protecting the prism for years of reliable use.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e2-inch ClickLock System: Instant, Secure Clamping\u003c\/h3\u003e\n\u003cp\u003eThe integrated 2-inch Baader ClickLock clamp replaces traditional thumbscrews with a more elegant and secure solution. A gentle twist of the outer ring activates a three-point clamping system that holds any 2-inch eyepiece or accessory firmly and perfectly centered on the optical axis. This system prevents marring of your eyepiece barrels and ensures a solid connection that won't slip, even with heavy accessories.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eFull 2-inch Aperture: No Vignetting with Wide-Field Eyepieces\u003c\/h3\u003e\n\u003cp\u003eEngineered with a full 2-inch clear aperture, this Amici prism ensures that the light cone from your telescope is not obstructed before reaching your eyepiece. This is critical when using low-power, wide-field 2-inch eyepieces to view expansive targets like the Andromeda Galaxy (M31) or the Pleiades (M45). The unrestricted light path guarantees a fully illuminated field of view, free from the dimming at the edges known as vignetting.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main advantage of the Baader 90° Astro-Grade Amici Prism over a standard star diagonal?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary advantage is \u003cstrong\u003efully corrected image orientation\u003c\/strong\u003e. A standard diagonal provides an upright but mirror-reversed image (left and right are swapped). The Baader Amici Prism corrects both axes, so the view is upright and not reversed, matching what you see with your naked eyes or on a star chart. This is essential for terrestrial viewing and intuitive for astronomical navigation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Baader 2\" Amici Prism perform for birdwatching with a high-end refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt performs exceptionally well. The correctly oriented image is perfect for tracking moving subjects like birds. The \u003cstrong\u003eBBHS® coatings\u003c\/strong\u003e ensure the brightest possible image with true-to-life color fidelity, allowing you to see fine feather details and subtle coloration, while the 90° angle provides a comfortable viewing position for extended periods.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the \"Astro-Grade\" designation mean for this Baader Amici Prism?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\"Astro-Grade\" refers to the high optical and mechanical precision used in its construction. All Amici prisms have a \"roof edge\" that can create a faint diffraction spike on very bright point sources. Baader's Astro-Grade manufacturing process sharpens this edge to a much higher tolerance than standard prisms, \u003cstrong\u003eminimizing the spike\u003c\/strong\u003e so it is virtually invisible on all but the brightest stars, preserving high-contrast planetary and deep-sky views.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 2-inch ClickLock clamp work on this Baader prism?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Baader ClickLock clamp is a pressure-locking system that eliminates the need for thumbscrews. A gentle \u003cstrong\u003e20° twist\u003c\/strong\u003e of the rubberized outer ring engages three hardened steel rollers that securely grip the eyepiece barrel. This provides three key benefits:\u003cbr\u003e\n\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePerfect Centering:\u003c\/strong\u003e The eyepiece is always held exactly on the optical axis.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSecure Hold:\u003c\/strong\u003e It provides a very strong, slip-free grip on heavy eyepieces and cameras.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNo Damage:\u003c\/strong\u003e It won't scratch or mar the barrels of your expensive eyepieces.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs there any optical trade-off when using an Amici prism like the Baader 90° Astro-Grade for astronomy?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe only theoretical trade-off is the potential for a faint diffraction spike on extremely bright stars like Vega or Sirius, caused by the prism's roof edge. However, the \"Astro-Grade\" precision of the Baader prism makes this effect so minimal that it is unnoticeable for the vast majority of astronomical observing, including detailed views of the Moon, planets, and deep-sky objects.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Baader 2\" Amici Prism to get a correctly oriented view of the Moon in my SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. It is an excellent choice for this. An SCT combined with this prism will show you the Moon exactly as it appears on a map or to the naked eye. This is especially useful for public outreach or when sharing views with beginners, as they can easily match what they see in the eyepiece to what they see in the sky.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet weight (kg)\u003c\/td\u003e\n\u003ctd\u003e0.66\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDeflection angle\u003c\/td\u003e\n\u003ctd\u003e90°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrism Glass (Type)\u003c\/td\u003e\n\u003ctd\u003eBaK-4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAR-Coating\u003c\/td\u003e\n\u003ctd\u003ePhantom Coating® Group\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClamping System\u003c\/td\u003e\n\u003ctd\u003eClickLock\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Diameter \/ Clear Aperture (mm)\u003c\/td\u003e\n\u003ctd\u003e44\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical length (mm)\u003c\/td\u003e\n\u003ctd\u003e85\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Connection (eyepiece\/-camera-sided)\u003c\/td\u003e\n\u003ctd\u003eø 2\" (50.8mm), M55\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Connection (lens sided)\u003c\/td\u003e\n\u003ctd\u003eM48, 2\"\/SCT Thread (50.8mm), M55\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Connection (lens sided)\u003c\/td\u003e\n\u003ctd\u003eø 2\" (50.8mm), S58\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eErecting Prism\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Orientation\u003c\/td\u003e\n\u003ctd\u003eErect image, Non-reversed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReflection surface\u003c\/td\u003e\n\u003ctd\u003eSealed BBHS coating\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGlas path\u003c\/td\u003e\n\u003ctd\u003e70 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBaader 90° Astro-Grade Amici Prism w\/ 2\" ClickLock and 2\" Nosepiece\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader_Planetarium_Star_Diagonals_T-2_and_2in_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBaader Planetarium Star Diagonals T-2 and 2in Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/baader-planetarium-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eBaader Planetarium Warranty Policy\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Baader Planetarium","offers":[{"title":"Default Title","offer_id":44967300399389,"sku":"BAA-2456120","price":976.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Baader-90-degree-Astro-Grade-Amici-Prism-with-BBHS-Coating-2-inch-ClickLock-1__04910.1597110530.1280.1280.jpg?v=1684340157"},{"product_id":"baader-45-amici-prism-diagonal-w-24mm-clear-aperture-1-25","title":"Baader 45° Amici Prism Diagonal  w\/ 24mm Clear Aperture - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eProvides a correctly oriented, erect image for terrestrial viewing\u003c\/li\u003e\n\u003cli\u003eComfortable 45° viewing angle\u003c\/li\u003e\n\u003cli\u003eFull 24mm clear aperture prevents vignetting with low-power eyepieces\u003c\/li\u003e\n\u003cli\u003eStandard 1.25\" barrel fits most telescopes and spotting scopes\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eBaader 45° Amici Prism Diagonal w\/ 24mm Clear Aperture - 1.25\"\u003c\/h2\u003e\n\u003cp\u003eThe Baader 45° Amici Prism Diagonal delivers correctly oriented images for terrestrial viewing through a standard 1.25\" barrel, specifically engineered to overcome the limitations of common erect-image prisms. Its defining feature is a full 24mm clear aperture, which provides complete illumination for wide-field eyepieces and prevents the field-edge dimming that plagues diagonals using smaller 19mm prisms.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e24mm Clear Aperture: Maximizing Low-Power Terrestrial Views\u003c\/h3\u003e\n\u003cp\u003eFor terrestrial observation—be it birdwatching, nature studies, or surveillance—a wide, bright field of view is critical. This Baader Amici diagonal uses a high-quality prism with a 24mm clear internal aperture, ensuring the entire light cone from your telescope reaches your low-power, wide-field eyepieces without being cut off. The result is a fully illuminated, edge-to-edge sharp view that makes spotting and tracking moving targets effortless.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eBaader 24mm vs. Standard 19mm Amici: The Wide-Field Difference\u003c\/h3\u003e\n\u003cp\u003eMany erect-image diagonals on the market use undersized prisms with clear apertures of only 19mm. While functional at high power, they cause significant vignetting (dimming at the edges) when paired with low-power eyepieces like a 32mm Plössl. The Baader 45° Amici Diagonal's larger 24mm prism eliminates this compromise, making it the superior choice for anyone who values a complete, unrestricted field of view for daytime observation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is the 24mm clear aperture of the Baader Amici Diagonal important?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e24mm clear aperture\u003c\/strong\u003e is crucial for low-magnification, wide-field viewing. Many standard 1.25\" diagonals use smaller prisms (around 19mm) that physically block a portion of the light cone when used with wide-field eyepieces. This Baader diagonal's larger aperture prevents that \"keyhole\" effect, ensuring a bright, fully illuminated view right to the edge of the field.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Baader 45° Amici Diagonal suitable for astronomical observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile designed for terrestrial use, it can be used for casual astronomical viewing. However, Amici prisms inherently have a tiny ridge in the prism that can create a faint diffraction spike on very bright objects like Jupiter or bright stars. For critical planetary or deep-sky observation, a standard mirror or prism star diagonal is optically superior.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the Baader Amici Diagonal perform with a 32mm Plössl eyepiece for birdwatching?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt will perform exceptionally well. A 32mm Plössl is a classic low-power eyepiece that benefits greatly from the diagonal's 24mm clear aperture. You will get a bright, wide, and correctly oriented view without the edge-of-field dimming common with lesser diagonals, making it ideal for spotting birds against a complex background.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does \"Amici Prism\" mean and why is it 45°?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAn \u003cstrong\u003eAmici prism\u003c\/strong\u003e, or roof prism, is an optical design that corrects the image both vertically and horizontally. This provides a view that is identical to what you see with your naked eye (not mirror-reversed), which is essential for terrestrial use. The \u003cstrong\u003e45° angle\u003c\/strong\u003e provides a much more comfortable viewing position for looking at objects on or near the horizon compared to a 90° astronomical diagonal.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill I need to re-focus when switching to the Baader 45° Amici Diagonal?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, you will likely need to adjust focus. Different diagonals have different optical path lengths, meaning they change the point where the telescope's image comes to focus. This is normal and easily corrected by turning your telescope's focuser knob.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Baader Amici Diagonal with my 80mm f\/7 refractor for scenic viewing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. An 80mm f\/7 refractor is a perfect match for this diagonal. It will turn your telescope into a high-quality spotting scope, providing crisp, correctly oriented views of distant landscapes, ships at sea, or wildlife. The 24mm aperture ensures you can take full advantage of low-power eyepieces for the widest possible vistas.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiagonal Type\u003c\/td\u003e\n\u003ctd\u003e45° Amici Prism (Erect Image)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClear Aperture\u003c\/td\u003e\n\u003ctd\u003e24mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet weight (kg)\u003c\/td\u003e\n\u003ctd\u003e0.16\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAR-Coating\u003c\/td\u003e\n\u003ctd\u003eMulti-Coated (MC)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClamping System\u003c\/td\u003e\n\u003ctd\u003eScrew clamps\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical length (mm)\u003c\/td\u003e\n\u003ctd\u003e99\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Connection (eyepiece\/-camera-sided)\u003c\/td\u003e\n\u003ctd\u003eø 1¼\" (31.75 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Connection (lens sided)\u003c\/td\u003e\n\u003ctd\u003e1.4\" Thread (35.5 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Connection (lens sided)\u003c\/td\u003e\n\u003ctd\u003eø 1¼\" (31.75 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eErecting Prism\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Orientation\u003c\/td\u003e\n\u003ctd\u003eErect image, Non-reversed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReflection surface\u003c\/td\u003e\n\u003ctd\u003eTotal reflection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBaader 45° Amici Prism Diagonal - 1.25\"\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader_Planetarium_Star_Diagonals_T-2_and_2in_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBaader Planetarium Star Diagonals T-2 and 2in Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/baader-planetarium-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eBaader Planetarium Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Baader Planetarium","offers":[{"title":"Default Title","offer_id":44967300464925,"sku":"BAA-2956150","price":123.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Baader-45-degree-Amici-Prism-Diagonal-with-24mm-Clear-Ape-1__37884.1597110531.1280.1280.jpg?v=1684340160"},{"product_id":"baader-45-amici-prism-diagonal-45-2-sct-thread","title":"Baader 45° Amici Prism Diagonal 45° - 2\" SCT Thread","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eProvides a fully corrected, upright, and non-reversed image\u003c\/li\u003e\n\u003cli\u003eComfortable 45° viewing angle for terrestrial observation\u003c\/li\u003e\n\u003cli\u003eAttaches directly to 2\" SCT rear cell threads\u003c\/li\u003e\n\u003cli\u003eAccepts both 2\" and 1.25\" eyepieces via included reducer\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eBaader 45° Amici Prism Diagonal - 2\" SCT Thread\u003c\/h2\u003e\n\u003cp\u003eThe Baader 45° Amici Prism Diagonal converts your Schmidt-Cassegrain telescope for terrestrial viewing by delivering a fully corrected image at a comfortable 45° angle. It connects directly to a standard 2\" SCT thread and includes a reducer to accept both 2\" and 1.25\" eyepieces, making it a dedicated tool for daytime observation, birdwatching, or surveillance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe 45° Amici Prism: A Fully Correct, Non-Reversed Image\u003c\/h3\u003e\n\u003cp\u003eUnlike standard astronomical diagonals that leave the image mirror-reversed, the Amici \"roof\" prism design in this Baader 45° diagonal corrects the view on both axes. This means landscapes, boats on the water, and wildlife appear exactly as they would through binoculars—upright and correctly oriented left-to-right. This intuitive view is essential for terrestrial use where a reversed image would be disorienting.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e2\" SCT Threads and 1.25\" Eyepiece Compatibility\u003c\/h3\u003e\n\u003cp\u003eThis diagonal is engineered for a secure, direct connection to the rear cell of most Schmidt-Cassegrain telescopes, eliminating the flexure common with standard 2\" nosepiece adapters. The eyepiece holder accepts large 2\" wide-field eyepieces, and with the included 2\" to 1.25\" reducer, you can also use the full range of standard 1.25\" eyepieces for higher magnification.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eBaader 45° Amici vs. 90° Star Diagonals: Terrestrial vs. Astronomical Use\u003c\/h3\u003e\n\u003cp\u003eChoosing between a 45° Amici and a 90° star diagonal depends entirely on your primary target. The Baader 45° Amici is the superior choice for daytime and terrestrial viewing, where a comfortable downward-looking angle and a non-reversed image are critical.\u003c\/p\u003e\n\u003cp\u003eFor astronomical targets high in the sky, a 90° star diagonal provides a more comfortable head position and, if it's a high-quality mirror model, typically offers slightly higher light transmission and contrast. The roof-edge in an Amici prism can introduce a faint diffraction spike on extremely bright point sources like Vega or Jupiter, making the 90° diagonal a better tool for critical deep-sky and planetary observation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main advantage of the Amici prism in the Baader 45° Diagonal?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary advantage is a \u003cstrong\u003efully corrected image\u003c\/strong\u003e. An Amici prism corrects the view both vertically (up-down) and horizontally (left-right). This provides an intuitive, non-reversed image identical to what you'd see with your naked eye or through binoculars, which is essential for terrestrial and daytime observing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Baader 45° Amici Diagonal work for birdwatching with a Celestron 8\" SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt's an excellent combination. The diagonal threads directly onto the 8\" SCT's rear cell for a stable connection. The 45° angle is comfortable for scanning landscapes or treetops, and the correctly oriented image makes it easy to follow moving birds. Using a low-power 2\" eyepiece gives you a wide field to locate subjects, while a higher-power 1.25\" eyepiece lets you zoom in on details.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Baader 45° Amici Diagonal to view the Moon?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, absolutely. It's a great choice for casual lunar viewing, as the Moon will appear in its correct orientation, just as it does in the sky. For high-magnification scientific observation of subtle crater details, a high-quality 90° mirror diagonal may provide slightly better contrast, but for an intuitive view, the 45° Amici is perfect.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this Baader diagonal work with my refractor or Newtonian telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this model is designed specifically to attach to the \u003cstrong\u003e2\" SCT thread\u003c\/strong\u003e found on the back of Schmidt-Cassegrain and some Maksutov-Cassegrain telescopes. It does not have a standard 2\" nosepiece to slide into a refractor's focuser drawtube and is not intended for use with Newtonian reflectors.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is a 45° diagonal better for daytime use than a 90° diagonal?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 45° angle provides a more natural and comfortable viewing position when your telescope is pointed horizontally or slightly downwards at terrestrial targets. A 90° diagonal would force you to look straight down into the eyepiece, which is awkward for daytime use but ideal for looking up at astronomical objects near the zenith.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes this Baader diagonal accept both 2\" and 1.25\" eyepieces?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The Baader 45° Amici Prism Diagonal has a native 2\" eyepiece holder and comes with a \u003cstrong\u003e2\" to 1.25\" reducing adapter\u003c\/strong\u003e. This allows you to use the widest possible range of eyepieces, from low-power 2\" wide-fields to high-power 1.25\" planetary eyepieces.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet weight (kg)\u003c\/td\u003e\n\u003ctd\u003e0.47\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDeflection angle\u003c\/td\u003e\n\u003ctd\u003e45°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAR-Coating\u003c\/td\u003e\n\u003ctd\u003eMulti-Coated (MC)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClamping System\u003c\/td\u003e\n\u003ctd\u003eDovetail clamp\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Diameter \/ Clear Aperture (mm)\u003c\/td\u003e\n\u003ctd\u003e26\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical length (mm)\u003c\/td\u003e\n\u003ctd\u003e121mm with 2\" barrel; with 1.25\"-reducer additional 10mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Connection (eyepiece\/-camera-sided)\u003c\/td\u003e\n\u003ctd\u003eø 1¼\" (31.75 mm), ø 2\" (50.8mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Connection (lens sided)\u003c\/td\u003e\n\u003ctd\u003e2\"\/SCT Thread (50.8mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eErecting Prism\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Orientation\u003c\/td\u003e\n\u003ctd\u003eErect image, Non-reversed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReflection surface\u003c\/td\u003e\n\u003ctd\u003eTotal reflection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBaader 45° Amici Prism Diagonal with 2\" SCT Thread\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e2\" to 1.25\" Reducer\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader_Planetarium_Star_Diagonals_T-2_and_2in_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBaader Planetarium Star Diagonals T-2 and 2in Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/baader-planetarium-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eBaader Planetarium Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Baader Planetarium","offers":[{"title":"Default Title","offer_id":44967300497693,"sku":"BAA-2956151","price":348.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Baader-45-degree-Amici-Prism-Diagonal-45-degree-2-inch-SCT-Thread-1__56303.1597110532.1280.1280.jpg?v=1684340163"},{"product_id":"baader-90-erecting-prism-diagonal-2","title":"Baader 90° Erecting Prism Diagonal - 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eProvides a fully erect, non-reversed image\u003c\/li\u003e\n\u003cli\u003e90° viewing angle for comfortable observing\u003c\/li\u003e\n\u003cli\u003e2\" barrel for use with large focusers\u003c\/li\u003e\n\u003cli\u003eIncludes a 2\" to 1.25\" reducer for eyepiece versatility\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eBaader 90° Erecting Prism Diagonal - 2\"\u003c\/h2\u003e\n\u003cp\u003eThe Baader 90° Erecting Prism Diagonal delivers a fully corrected, right-side-up and left-to-right correct image at a comfortable 90° angle, making it ideal for terrestrial viewing through an astronomical telescope. Its robust 2\" barrel is designed to fit large focusers, enabling the use of wide-field eyepieces for expansive daytime landscapes or rich-field stargazing. For maximum flexibility, it includes a reducer for compatibility with the universally common 1.25\" eyepiece format.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA 90° Correct-Image View for Terrestrial and Astronomical Use\u003c\/h3\u003e\n\u003cp\u003eUnlike standard star diagonals that produce a mirror-reversed image, an erecting prism corrects the view on both axes. This is essential for terrestrial applications like birdwatching or nature observation, where an upside-down or reversed image would be disorienting. For astronomical use, it provides an intuitive view that matches star charts, which is particularly helpful for beginners navigating the constellations or for public outreach.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe 2\" Format Advantage with a 1.25\" Adapter\u003c\/h3\u003e\n\u003cp\u003eThe 2\" barrel format allows the diagonal to accept eyepieces with the largest possible field stops, maximizing the true field of view your telescope can deliver. This is perfect for framing broad landscapes or sweeping through the Milky Way. The included high-quality 2\" to 1.25\" reducer ensures you can still use your entire collection of standard 1.25\" eyepieces without needing to purchase a separate adapter, maintaining a secure and centered optical path.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eBaader Erecting Prism vs. a Standard 2\" Mirror Diagonal\u003c\/h3\u003e\n\u003cp\u003eChoosing between an erecting prism and a mirror diagonal involves a clear trade-off between image orientation and optical purity, especially for critical deep-sky imaging.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eErecting Prism (This Product):\u003c\/strong\u003e Its primary advantage is the fully corrected image, indispensable for terrestrial viewing. For casual astronomy, the convenience of a non-reversed view is significant. However, prisms can introduce a small amount of chromatic aberration, particularly in fast focal ratio telescopes (f\/6 or below).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMirror Diagonal:\u003c\/strong\u003e A high-quality mirror diagonal typically offers higher light transmission and superior color correction, making it the preferred choice for serious astronomical observing and astrophotography where every photon counts. Its drawback is the left-right reversed image, which is a non-issue for deep-sky objects but problematic for terrestrial use.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the primary use for the Baader 90° Erecting Prism Diagonal?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIts main purpose is to adapt an astronomical telescope, such as a refractor or Schmidt-Cassegrain, for \u003cstrong\u003eterrestrial daytime viewing\u003c\/strong\u003e. The prism corrects the image to be both upright and non-reversed, so landscapes, ships on the horizon, or wildlife appear as you would see them with binoculars.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Baader 2\" Erecting Prism for observing planets and deep-sky objects?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, you can. It provides an intuitive, correctly-oriented view that is helpful for navigating with star charts. While a high-quality mirror diagonal is often preferred for critical deep-sky and planetary observation due to slightly better light transmission and color fidelity, this erecting prism is perfectly suitable for casual and educational astronomical viewing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Baader 90° Erecting Prism Diagonal work with my Newtonian reflector telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. Newtonian reflectors are not designed to use prism or mirror diagonals in their focusers. Adding one will prevent the telescope from reaching focus. This diagonal is designed for refractors, Schmidt-Cassegrains (SCTs), and Maksutov-Cassegrains (Maks).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Baader 2\" Erecting Prism perform for birdwatching with a 100mm f\/7 refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt performs exceptionally well in this scenario. A 100mm f\/7 refractor is an excellent instrument for high-power terrestrial viewing, and this diagonal will provide a bright, sharp, and correctly oriented image. The 2\" barrel allows the use of wide-field eyepieces to easily spot and track birds in flight, while the 1.25\" adapter lets you switch to higher power for detailed views of plumage.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill I need an extension tube to reach focus with the Baader 90° Erecting Prism?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003ePossibly. Prism diagonals often require more \"in-focus\" travel than mirror diagonals. While most modern refractors and SCTs have enough focuser travel to accommodate them, some older designs might not. If you find you cannot rack the focuser in far enough to achieve a sharp image, you may need to shorten your optical train.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the advantage of the 2\" barrel on the Baader Erecting Prism Diagonal?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e2\" barrel\u003c\/strong\u003e allows the diagonal to accept 2\" eyepieces, which can provide a much wider true field of view than 1.25\" eyepieces. This is ideal for scanning large areas of the sky, like searching for the Andromeda Galaxy (M31), or for taking in wide terrestrial panoramas.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiagonal Type\u003c\/td\u003e\n\u003ctd\u003eErecting Prism\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eViewing Angle\u003c\/td\u003e\n\u003ctd\u003e90°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReducer Included\u003c\/td\u003e\n\u003ctd\u003e2\" to 1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet weight (kg)\u003c\/td\u003e\n\u003ctd\u003e0.56\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAR-Coating\u003c\/td\u003e\n\u003ctd\u003eMulti-Coated (MC)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Diameter \/ Clear Aperture (mm)\u003c\/td\u003e\n\u003ctd\u003e38\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical length (mm)\u003c\/td\u003e\n\u003ctd\u003e99 mm with 2\" barrel; with 1.25\"-reducer additional 10 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Connection (eyepiece\/-camera-sided)\u003c\/td\u003e\n\u003ctd\u003eø 1¼\" (31.75 mm), ø 2\" (50.8mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Connection (lens sided)\u003c\/td\u003e\n\u003ctd\u003eM48\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Connection (lens sided)\u003c\/td\u003e\n\u003ctd\u003eø 2\" (50.8mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Orientation\u003c\/td\u003e\n\u003ctd\u003eErect image, Non-reversed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReflection surface\u003c\/td\u003e\n\u003ctd\u003eTotal reflection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBaader 90° Erecting Prism Diagonal - 2\"\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e2\" to 1.25\" Reducer\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDust Caps\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 2\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader_Planetarium_Star_Diagonals_T-2_and_2in_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBaader Planetarium Star Diagonals T-2 and 2in Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/baader-planetarium-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eBaader Planetarium Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Baader Planetarium","offers":[{"title":"Default Title","offer_id":44967300530461,"sku":"BAA-2956152","price":426.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Baader-90-degree-Erecting-Prism-Diagonal-2-inch-1__24039.1597110533.1280.1280.jpg?v=1684340171"},{"product_id":"baader-flipmirror-ii-star-diagonal","title":"Baader FlipMirror II Star Diagonal","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eInstantly switch between three different instrument ports\u003c\/li\u003e\n\u003cli\u003eStraight-through port for primary camera or spectrograph\u003c\/li\u003e\n\u003cli\u003e90° mirrored port for visual observation or secondary camera\u003c\/li\u003e\n\u003cli\u003eAuxiliary bottom port for guiders or calibration lamps\u003c\/li\u003e\n\u003cli\u003ePrecision-coated mirror ensures high-quality images\u003c\/li\u003e\n\u003cli\u003eCompact design minimizes back-focus consumption\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eBaader FlipMirror II Star Diagonal\u003c\/h2\u003e\n\u003cp\u003eThe Baader FlipMirror II Star Diagonal transforms your telescope's single focuser port into a versatile three-port imaging hub, eliminating the need to constantly swap accessories in the dark. It provides a straight-through path for a primary camera, a 90-degree mirrored path with a 32mm illuminated field for an eyepiece or guider, and a unique bottom port for calibration lamps or an off-axis guider prism. This system is the definitive solution for streamlining complex imaging, visual, and spectroscopy workflows.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA Three-Port Hub to Eliminate Instrument Swapping\u003c\/h3\u003e\n\u003cp\u003eA single telescope port is a major bottleneck for serious astronomers. The FlipMirror II solves this by providing three configurable ports, allowing you to have an imager, an eyepiece, and a guider or spectrograph calibration source connected simultaneously. A simple turn of the rotary knob switches the light path between the straight-through rear port and the 90-degree top port, saving time and preventing wear on your equipment.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eHigh-Fidelity Optics for Visual and Imaging\u003c\/h3\u003e\n\u003cp\u003eAt the core of the BFM II is a precise, surface-mirrored flip mirror featuring a multi-layer aluminum coating. This ensures that the angled light path delivers the same image brightness and resolution as a high-end standalone star diagonal. Whether you are conducting visual observations or capturing high-resolution images with small-pixel cameras, the FlipMirror II maintains the integrity of your optical train without compromise.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eTotal System Integration with the Baader Adapter Universe\u003c\/h3\u003e\n\u003cp\u003eDesigned for maximum compatibility, the FlipMirror II seamlessly integrates with the comprehensive Baader Astro T-2, M48, and M68 adapter systems. This modularity allows you to connect virtually any camera, eyepiece, or accessory while achieving precise optical alignment. Its thoughtful, compact design conserves precious back-focus, though any new component in the optical train requires consideration of the total path length. The system also enables precise adjustment of all light paths to achieve parfocality between your different instruments.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eUnlocking Advanced Workflows in Spectroscopy and Guiding\u003c\/h3\u003e\n\u003cp\u003eThe BFM II is purpose-built for advanced applications. The bottom auxiliary port can be used to mount a calibration lamp, allowing you to calibrate spectra without removing your spectrograph from the main port. The back of the flip mirror is also coated and masked to direct this calibration light onto the spectrograph slit. Alternatively, this port can house an off-axis-guider pickoff prism that remains independent of the main mirror's position, ensuring consistent guiding no matter which primary port is active.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat are the three ports on the Baader FlipMirror II for?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Baader FlipMirror II provides three connection points to manage your equipment efficiently:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRear Port (Straight-Through):\u003c\/strong\u003e This is the primary position for your main imaging camera or a spectrograph, offering a direct, unobstructed light path.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTop Port (90° Angled):\u003c\/strong\u003e This port uses the internal mirror and functions like a star diagonal. It's ideal for a visual eyepiece for centering objects, or for a secondary camera.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBottom Port (Auxiliary):\u003c\/strong\u003e This port is designed for specialized tools like a spectrograph calibration lamp or an off-axis guider pick-off prism.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Baader FlipMirror II degrade my planetary images?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. The Baader FlipMirror II uses a precise, surface-mirrored diagonal with a high-reflectivity multi-layer aluminum coating. Its optical quality is engineered to be on par with high-end star diagonals, ensuring that it does not introduce aberrations or reduce sharpness, even when used for high-resolution imaging with cameras that have small pixels.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Baader FlipMirror II help with spectroscopy?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe FlipMirror II is a powerful tool for spectroscopy. You can keep your spectrograph attached to the main straight-through port while attaching a calibration lamp to the bottom auxiliary port. The back of the flip mirror is specially coated to redirect the lamp's light into the spectrograph's slit by simply flipping the mirror, allowing for quick and easy calibration frames without disassembling your setup.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I motorize the Baader FlipMirror II for remote operation?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the Baader FlipMirror II is designed for future motorization. It can be operated with an optional toothed belt and motor, which can be controlled by systems like the Baader SteelDrive II controller. This allows you to switch between the imaging and visual ports remotely from your computer, which is essential for automated observatories.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow would I set up the Baader FlipMirror II with my Celestron SCT and a ZWO camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor a common SCT setup, you would attach the Baader FlipMirror II to your telescope's visual back. Your primary ZWO imaging camera would be connected to the straight-through rear port. An eyepiece for finding and centering objects would go in the 90-degree top port. If you use an off-axis guider, the OAG's pick-off prism could be attached to the bottom port, providing a permanent guiding solution regardless of which main port you are using.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the Baader FlipMirror II consume a lot of back-focus?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Baader FlipMirror II has a compact and efficient design to minimize back-focus consumption. However, like any accessory added to an optical train (e.g., filter wheels, OAGs), it does have a specific light path length that must be accounted for. It's crucial to check the back-focus requirements of your telescope and any reducers or correctors to ensure you can reach focus with your camera.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet weight (kg)\u003c\/td\u003e\n\u003ctd\u003e0.24\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical length (mm)\u003c\/td\u003e\n\u003ctd\u003e55 mm with S52, 59 mm with M48\/T-2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Connection (eyepiece\/-camera-sided)\u003c\/td\u003e\n\u003ctd\u003eM48, S52\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Connection (eyepiece\/-camera-sided)\u003c\/td\u003e\n\u003ctd\u003eM48\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Connection (lens sided)\u003c\/td\u003e\n\u003ctd\u003eM42 x 0.75 (T-2), M48, S52\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eMirror Diagonal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader_Planetarium_FlipMirror_II_Star_Diagonal_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBaader Planetarium FlipMirror II Star Diagonal Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader_Planetarium_Star_Diagonals_T-2_and_2in_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBaader Planetarium Star Diagonals T-2 and 2in Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/baader-planetarium-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eBaader Planetarium Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Baader Planetarium","offers":[{"title":"Default Title","offer_id":44967300694301,"sku":"BAA-2458055","price":332.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader-FlipMirror-II-Star-Diagonal-1__35218.1597110539.1280.1280.gif?v=1684339985"},{"product_id":"baader-maxbright-mirror-diagonal-t-2","title":"Baader Maxbright Mirror Diagonal - T-2","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eFeatures Baader's T-2 System threads for full modularity\u003c\/li\u003e\n\u003cli\u003eHigh-reflectivity Maxbright mirror for bright, high-contrast views\u003c\/li\u003e\n\u003cli\u003eAll-metal housing for durability and precise alignment\u003c\/li\u003e\n\u003cli\u003eAdaptable for visual and imaging applications\u003c\/li\u003e\n\u003cli\u003eCompact design minimizes optical path length\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eBaader Maxbright Mirror Diagonal - T-2\u003c\/h2\u003e\n\u003cp\u003eThe Baader T-2 Maxbright Mirror Diagonal serves as the versatile core of a custom-built optical train, offering unparalleled adaptability through the Baader T-2 thread system. Instead of being locked into a fixed 1.25\" or 2\" format, this diagonal provides T-2 (M42x0.75) threads on both the telescope and eyepiece sides, allowing you to create a rigid, optimized connection for any refractor or Schmidt-Cassegrain telescope.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe Baader T-2 System: A Fully Modular Diagonal Core\u003c\/h3\u003e\n\u003cp\u003eThe defining feature of this diagonal is its integration into the Baader T-2 Astro System. This modularity allows you to choose the exact adapters you need, minimizing optical path length and eliminating the potential for flexure common with slip-fit accessories. You can configure it as a standard visual diagonal with a 1.25\" nosepiece and eyepiece holder, or create a fully threaded imaging train by connecting it directly to T-2 compatible reducers, flatteners, and cameras.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eMaxbright Mirror: High-Reflectivity for Brighter Views\u003c\/h3\u003e\n\u003cp\u003eAt the heart of the diagonal is Baader's Maxbright first-surface mirror, which provides exceptional reflectivity across the visual spectrum. This ensures that the maximum amount of light from your telescope reaches the eyepiece or camera sensor, resulting in brighter images and improved contrast. This is especially critical when observing faint deep-sky objects like the Veil Nebula (NGC 6960) or resolving subtle details on planetary surfaces.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main advantage of the Baader T-2 Maxbright Diagonal over a standard diagonal?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary advantage is \u003cstrong\u003emodularity\u003c\/strong\u003e. A standard diagonal has a fixed nosepiece and eyepiece holder. The Baader T-2 Maxbright Diagonal uses T-2 threads, allowing you to choose your own adapters to create a shorter, more rigid optical train that is perfectly matched to your specific telescope and camera or eyepieces.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat adapters do I need to use the T-2 Maxbright Diagonal?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis diagonal is sold as a core component and requires separate adapters. For visual use in a standard 1.25\" focuser, you would typically need:\n\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eA \u003cstrong\u003e1.25\" nosepiece with a T-2 male thread\u003c\/strong\u003e for the telescope side.\u003c\/li\u003e\n\u003cli\u003eA \u003cstrong\u003eT-2 eyepiece holder\u003c\/strong\u003e, such as the Baader 1.25\" ClickLock, for the eyepiece side.\u003c\/li\u003e\n\u003c\/ul\u003e\nFor imaging, you can use various T-2 extension tubes and adapters to connect directly to your camera or field flattener.\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs a mirror diagonal like the Baader Maxbright better than a prism diagonal for my SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor most applications, yes. A high-quality mirror diagonal like the Maxbright introduces no chromatic aberration, preserving the true color fidelity of the telescope. This is beneficial for all telescope types, but especially for \"fast\" optical systems (below f\/7). While prisms can sometimes offer slightly more contrast, modern dielectric mirror coatings have largely closed that gap.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Baader T-2 Maxbright Diagonal for astrophotography of planets like Jupiter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. The high reflectivity of the Maxbright mirror ensures maximum light reaches your planetary camera, allowing for shorter exposures and higher frame rates, which helps to \"freeze\" atmospheric seeing. The rigid, threaded T-2 connections also prevent any tilt or flexure in the imaging train, which is critical for maintaining sharp focus at high magnifications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the \"Maxbright\" designation mean?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eMaxbright\u003c\/strong\u003e is Baader Planetarium's designation for their high-reflectivity mirror coatings. While a standard aluminum mirror might reflect around 88-92% of light, a modern dielectric coating like that used on the Maxbright mirror offers significantly higher reflectivity. This results in a noticeably brighter view at the eyepiece.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this T-2 diagonal work with Baader's binoviewers?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this diagonal is an excellent choice for binoviewing. Its T-2 connections allow it to integrate seamlessly with accessories like Baader's Glasspath Correctors, which are often necessary to reach focus with binoviewers in refractors and Newtonians. The modularity helps in creating the shortest possible optical path.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet weight (kg)\u003c\/td\u003e\n\u003ctd\u003e0.18\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDeflection angle\u003c\/td\u003e\n\u003ctd\u003e90°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClamping System\u003c\/td\u003e\n\u003ctd\u003eno clamp\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Diameter \/ Clear Aperture (mm)\u003c\/td\u003e\n\u003ctd\u003e34\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical length (mm)\u003c\/td\u003e\n\u003ctd\u003e43\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Connection (eyepiece\/-camera-sided)\u003c\/td\u003e\n\u003ctd\u003eM34\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Connection (eyepiece\/-camera-sided)\u003c\/td\u003e\n\u003ctd\u003eM42 x 0.75 (T-2)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Connection (lens sided)\u003c\/td\u003e\n\u003ctd\u003eM42 x 0.75 (T-2)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eMirror Diagonal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Orientation\u003c\/td\u003e\n\u003ctd\u003eErect image, Mirror inverted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReflection surface\u003c\/td\u003e\n\u003ctd\u003eDielectrically coated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader_Planetarium_Astro_T-2_System_Connections_Overview.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBaader Planetarium Astro T-2 System Connections Overview\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader_Planetarium_Star_Diagonals_T-2_and_2in_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBaader Planetarium Star Diagonals T-2 and 2in Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader_Planetarium_Astro_T-2_System_Parts_List.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBaader Planetarium Astro T-2 System Parts List\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/baader-planetarium-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eBaader Planetarium Warranty Policy\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Baader Planetarium","offers":[{"title":"Default Title","offer_id":44967301021981,"sku":"BAA-2456100","price":324.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Baader-Maxbright-Mirror-Diagonal-T-2-1__41388.1597110544.1280.1280.jpg?v=1684340179"},{"product_id":"baader-mirror-diagonal-w-bbhs-coating-t-2","title":"Baader Mirror Diagonal w\/ BBHS Coating - T-2","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eBBHS® BroadBand Hard Silver Coating\u003c\/li\u003e\n\u003cli\u003eProtective Dielectric Overcoat\u003c\/li\u003e\n\u003cli\u003eBaader T-2 System Component\u003c\/li\u003e\n\u003cli\u003eModular Threaded Connections\u003c\/li\u003e\n\u003cli\u003eOptimized for High Reflectivity\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eBaader T-2 BBHS Mirror Diagonal\u003c\/h2\u003e\n\u003cp\u003eThe Baader T-2 BBHS Mirror Diagonal is engineered around a single goal: to deliver the highest possible light transmission with uncompromising durability. It combines the raw reflectivity of a hard silver coating with the resilience of a modern dielectric overcoat, creating a hybrid mirror that excels across the entire visual spectrum. As a core component of the Baader T-2 Astro System, this diagonal body offers complete modularity for building a rigid, minimal-length imaging or visual train.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eBBHS Hybrid Silver Coating: Reflectivity and Durability\u003c\/h3\u003e\n\u003cp\u003eThe heart of this diagonal is its BroadBand Hard Silver (BBHS) coating. Unlike standard aluminum or dielectric mirrors, it uses a silver base layer for its exceptionally high reflectivity, especially in the red and near-infrared portions of the spectrum. This makes a noticeable difference in image brightness, particularly when observing faint nebulae rich in H-alpha emissions.\u003c\/p\u003e\n\u003cp\u003eHistorically, the drawback of silver has been its tendency to tarnish. Baader solves this by sealing the silver under a hard dielectric protective overcoat. This multi-layer system gives you the longevity and cleaning resilience of a dielectric mirror while preserving the superior brightness of silver, offering a no-compromise optical surface.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe Baader T-2 Astro System: Ultimate Modularity\u003c\/h3\u003e\n\u003cp\u003eThis diagonal is not a standalone accessory but a central hub in the Baader T-2 Astro System. Instead of fixed 1.25\" or 2\" barrels, it features T-2 threads on both its inlet and outlet faces. This design allows you to create a completely customized and rigidly-coupled connection between your telescope and eyepiece or camera.\u003c\/p\u003e\n\u003cp\u003eFor astrophotographers, this modularity is critical for minimizing back-focus and eliminating flexure. You can attach T-2 nosepieces, extension tubes, off-axis guiders, and eyepiece holders like the Baader ClickLock to build an optical train with the shortest possible path length. For visual observers, it means you can configure the diagonal to work perfectly with any telescope or eyepiece format.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eBBHS Mirror vs. Dielectric: A Choice for Visual and H-Alpha Imaging\u003c\/h3\u003e\n\u003cp\u003eWhile a high-quality dielectric diagonal offers excellent, flat reflectivity across the visual spectrum and extreme durability, the BBHS silver mirror provides a distinct advantage. The competitor's strength is its ruggedness and consistent reflection, making it a reliable workhorse.\u003c\/p\u003e\n\u003cp\u003eThe Baader BBHS diagonal, however, pushes reflectivity higher, particularly beyond 600nm. This results in visibly brighter images and enhanced contrast on emission nebulae. For an observer using an H-alpha filter or imaging deep-sky targets like the North American Nebula (NGC 7000), the increased red sensitivity of the BBHS coating extracts more signal and delivers a more vibrant view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main advantage of the Baader T-2 BBHS Mirror Diagonal's coating?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary advantage is its \u003cstrong\u003ehybrid silver and dielectric design\u003c\/strong\u003e. It uses a BroadBand Hard Silver (BBHS) base for maximum reflectivity, especially in the red spectrum, resulting in brighter images. This silver layer is protected by a durable dielectric overcoat, preventing tarnish and making it as resilient as a standard dielectric mirror.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the T-2 system benefit my setup with this Baader diagonal?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe T-2 thread system provides complete \u003cstrong\u003emodularity\u003c\/strong\u003e. Instead of fixed barrels, you can attach any T-2 compatible accessory directly to the diagonal's body. This allows you to:\n\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCreate a rigid, flex-free connection for imaging.\u003c\/li\u003e\n\u003cli\u003eMinimize the optical path length to save precious back-focus.\u003c\/li\u003e\n\u003cli\u003eAdapt the diagonal for use with 1.25\" or 2\" nosepieces and eyepiece holders.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs a mirror diagonal like the Baader BBHS better than a prism for my telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt depends on your telescope. For Schmidt-Cassegrains (SCTs), Maksutovs, and other long focal-ratio telescopes, a high-quality mirror diagonal like the BBHS is ideal, as it introduces no chromatic aberration. For very fast refractors (f\/5 or below), a prism diagonal can sometimes offer slightly better contrast and correct for minor spherical aberration, though the BBHS mirror's superior reflectivity remains a significant advantage.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Baader BBHS diagonal work for H-alpha imaging of the Orion Nebula (M42)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, absolutely. The BBHS coating is specifically designed to have enhanced reflectivity in the red end of the spectrum, which includes the 656nm H-alpha line. When imaging emission nebulae like the Orion Nebula (M42) or the North American Nebula (NGC 7000), this diagonal will transmit more of the critical light to your sensor compared to standard coatings, resulting in a stronger signal.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the silver coating on the BBHS diagonal require special care?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. While unprotected silver tarnishes easily, the Baader BBHS mirror is sealed with a hard, protective dielectric overcoat. You can clean it just as you would any high-quality dielectric mirror, using standard, safe optical cleaning techniques. The overcoat ensures decades of high performance without degradation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use 2-inch eyepieces with the Baader T-2 BBHS Diagonal?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, but you will need the appropriate Baader T-2 adapters. The diagonal body itself has T-2 threads. To use 2-inch eyepieces, you would typically add a Baader T-2 to 2\" ClickLock or similar eyepiece holder to the output side of the diagonal. This modularity allows you to configure it for any standard.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet weight (kg)\u003c\/td\u003e\n\u003ctd\u003e0.18\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDeflection angle\u003c\/td\u003e\n\u003ctd\u003e90°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClamping System\u003c\/td\u003e\n\u003ctd\u003eno clamp\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Diameter \/ Clear Aperture (mm)\u003c\/td\u003e\n\u003ctd\u003e33\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical length (mm)\u003c\/td\u003e\n\u003ctd\u003e43\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Connection (eyepiece\/-camera-sided)\u003c\/td\u003e\n\u003ctd\u003eM42 x 0.75 (T-2)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Connection (lens sided)\u003c\/td\u003e\n\u003ctd\u003eM42 x 0.75 (T-2)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eMirror Diagonal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Orientation\u003c\/td\u003e\n\u003ctd\u003eErect image, Mirror inverted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReflection surface\u003c\/td\u003e\n\u003ctd\u003eBBHS coated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader_Planetarium_Star_Diagonals_T-2_and_2in_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBaader Planetarium Star Diagonals T-2 and 2in Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/baader-planetarium-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eBaader Planetarium Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Baader Planetarium","offers":[{"title":"Default Title","offer_id":44967301054749,"sku":"BAA-2456103","price":401.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Baader-Mirror-Diagonal-with-BBHS-Coating-T-2-1__98849.1597110546.1280.1280.jpg?v=1684340187"},{"product_id":"baader-mirror-diagonal-w-bbhs-coating-2-clicklock","title":"Baader Mirror Diagonal w\/ BBHS Coating - 2\" ClickLock","description":"\u003c!-- more --\u003e\u003cul\u003e\n\u003cli\u003e2\" BBHS star diagonal with 2\" ClickLock terminal and black case. Provides greatest reflectance over most spectral range from 390 to 2000nm\u003c\/li\u003e\n\u003cli\u003eNew included item since 01\/2020: Baader 2\" Safety Kerf nosepiece with 2\" filter thread (#2408156) with additional grip and security from inadvertent slipping. This 2\" nosepiece replace the former included 2\" standard clamp with undercut\u003c\/li\u003e\n\u003cli\u003eMuch higher in brilliance than standard dielectric coatings\u003c\/li\u003e\n\u003cli\u003eBBHS = Broadband Hardsilver coating with dielectric protective overcoating\u003c\/li\u003e\n\u003cli\u003eT-2 BBHS-Sitall zenith mirrors on both sides with T-2 Photo thread\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003c\/p\u003e\u003cdiv\u003e\u003ciframe src=\"https:\/\/www.youtube.com\/embed\/oYoymtIT0ww\" frameborder=\"0\" allow=\"accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen=\"\u0026gt;\u0026lt;\/iframe\u0026gt;\u0026lt;\/div\u0026gt;\u0026lt;\/p\u0026gt;\u0026lt;\/div\u0026gt;\"\u003e\u003c\/iframe\u003e\u003c\/div\u003e","brand":"Baader Planetarium","offers":[{"title":"Default Title","offer_id":44967301087517,"sku":"BAA-2456115","price":698.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Baader-Mirror-Diagonal-with-BBHS-Coating-2-inch-ClickLock-1__62728.1597110547.1280.1280.jpg?v=1684340195"},{"product_id":"baader-m55-m68-adapter-for-2-baader-mirrors-prisms","title":"Baader M55\/M68 Adapter for 2\" Baader Mirrors \u0026 Prisms","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eConverts Baader 2\" diagonals to a rigid M68 threaded connection\u003c\/li\u003e\n\u003cli\u003eAttaches to the M55 female thread on the diagonal body\u003c\/li\u003e\n\u003cli\u003eProvides a standard M68 x 1 male thread for accessories\u003c\/li\u003e\n\u003cli\u003eReplaces the original 2\" nosepiece and eyepiece holder\u003c\/li\u003e\n\u003cli\u003eEliminates flexure and tilt in demanding imaging setups\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eBaader M55\/M68 Adapter for 2\" Baader Mirrors \u0026amp; Prisms\u003c\/h2\u003e\n\u003cp\u003eThe Baader M55\/M68 Adapter transforms your Baader 2\" diagonal from a standard slip-fit eyepiece holder into a rigid, fully threaded M68 connection point for serious imaging. This single component replaces both the 2\" nosepiece and eyepiece clamp, attaching directly to the diagonal's M55 housing thread to create an uninterrupted, secure optical train.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA Fully Threaded Connection: From M55 to the M68 System\u003c\/h3\u003e\n\u003cp\u003eFor astrophotography, any source of tilt or flexure can degrade image quality, especially with heavy cameras or complex filter wheels. This adapter solves that problem by eliminating the 2\" slip-fit compression ring mechanism entirely. By converting the diagonal's native M55 thread to the large-format M68 (Zeiss) standard, you can directly attach correctors, reducers, and off-axis guiders for a connection that will not sag or shift during an exposure.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eInstallation on Baader 2\" Diagonals\u003c\/h3\u003e\n\u003cp\u003eThis adapter is designed specifically for Baader's 2\" mirror and prism diagonals. Installation is straightforward: simply unthread and remove the original 2\" nosepiece (or ClickLock clamp) and the M55\/2\"\/S58 ring from the diagonal's body. The M55\/M68 adapter then screws directly into the exposed female M55 thread on the diagonal housing, providing a robust M68 male thread ready for your imaging accessories.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy should I replace my Baader 2\" ClickLock with this M55\/M68 adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile the \u003cstrong\u003eBaader ClickLock\u003c\/strong\u003e is excellent for fast and secure visual use, a fully threaded connection is superior for astrophotography. The M55\/M68 adapter creates a rigid, non-flexing link between your diagonal and imaging equipment, which is critical for preventing tilt when using heavy cameras or long accessory trains.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this Baader M55\/M68 adapter work with my Celestron or other brand 2\" diagonal?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this adapter is designed specifically for the M55 thread size and flange distance found on \u003cstrong\u003eBaader Planetarium 2\" diagonals\u003c\/strong\u003e. It is not compatible with diagonals from other manufacturers, which use different threading or have non-removable eyepiece holders.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat accessories can I connect to the Baader M55\/M68 adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe adapter provides a standard \u003cstrong\u003eM68 x 1 male thread\u003c\/strong\u003e. This allows you to connect any component from the Baader M68 system, including extension tubes, reducers, and adapters for specific cameras or coma correctors, creating a versatile and robust imaging setup.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes installing the Baader M55\/M68 adapter change the optical path length?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, replacing the original eyepiece holder with this adapter will alter the optical path length. You will need to account for this change when calculating back focus for your specific reducer or corrector. Refer to the Baader M68 system charts to determine the precise path length of your new configuration.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow can I use the Baader M55\/M68 adapter to attach my M48 filter wheel to my SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou would thread this adapter onto your Baader 2\" diagonal, which is attached to your SCT. This gives you an M68 male thread. From there, you would use a Baader M68 to M48 adapter (sold separately) to connect your filter wheel, ensuring a secure, all-threaded connection from the telescope to your camera.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Baader M55\/M68 adapter on both sides of the diagonal?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, if you have a Baader 2\" diagonal with removable, threaded adapters on both the telescope and eyepiece side, you can use two of these M55\/M68 adapters to create a full M68-to-M68 \"pass-through\" diagonal for specialized imaging applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet weight (kg)\u003c\/td\u003e\n\u003ctd\u003e0.03\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible Brands\u003c\/td\u003e\n\u003ctd\u003eBaader Planetarium, Zeiss\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Diameter \/ Clear Aperture (mm)\u003c\/td\u003e\n\u003ctd\u003e50.8 (2\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Diameter\u003c\/td\u003e\n\u003ctd\u003e68\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType of Adapter\u003c\/td\u003e\n\u003ctd\u003eExpanding Adapter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical length (mm)\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Connection (eyepiece\/-camera-sided)\u003c\/td\u003e\n\u003ctd\u003eM55\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Connection (lens sided)\u003c\/td\u003e\n\u003ctd\u003eM68 x 1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAdapters Family\u003c\/td\u003e\n\u003ctd\u003eM68 System\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader_Planetarium_Star_Diagonals_T-2_and_2in_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBaader Planetarium Star Diagonals T-2 and 2in Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/baader-planetarium-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eBaader Planetarium Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Baader Planetarium","offers":[{"title":"Default Title","offer_id":44967301185821,"sku":"BAA-2956110","price":76.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Baader-M55-M68-Adapter-for-2-inch-Baader-Mirrors-Prisms-1__80263.1597110548.1280.1280.jpg?v=1684340197"},{"product_id":"baader-mirror-diagonal-2-clicklock","title":"Baader Mirror Diagonal - 2\" ClickLock","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e2-inch Barrel Format\u003c\/li\u003e\n\u003cli\u003eBaader ClickLock Eyepiece Clamp\u003c\/li\u003e\n\u003cli\u003eHigh-Reflectivity Mirror Design\u003c\/li\u003e\n\u003cli\u003ePrecision Machined Body\u003c\/li\u003e\n\u003cli\u003eSelf-Centering Clamp Mechanism\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eBaader Mirror Diagonal - 2\" ClickLock\u003c\/h2\u003e\n\u003cp\u003eThe Baader 2\" ClickLock Mirror Diagonal replaces standard thumbscrew holders with a secure, self-centering clamp for heavy eyepieces and imaging equipment. A gentle twist of the outer ring locks any 2-inch accessory into place with a three-point grip that eliminates tilt and barrel scoring, ensuring your optical train remains perfectly aligned throughout the night.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe Baader ClickLock System: A Secure, Self-Centering Grip\u003c\/h3\u003e\n\u003cp\u003eThe core of this diagonal is Baader's acclaimed ClickLock mechanism. Instead of relying on one or two thumbscrews that can push an eyepiece off-center, the ClickLock system uses a robust cam-and-roller design. This ensures that every accessory you insert is perfectly centered and held rigidly, which is critical for maintaining sharp focus, especially for astrophotography.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNo More Marring:\u003c\/strong\u003e The even pressure from the three-point clamp prevents the scratches and gouges that thumbscrews often leave on expensive eyepiece barrels.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEffortless Operation:\u003c\/strong\u003e A small rotation of the knurled ring is all that's needed to lock or unlock your equipment. It's a simple, intuitive action that is easy to perform even with gloves on in cold weather.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAudible and Tactile Lock:\u003c\/strong\u003e You can feel and hear the mechanism engage, giving you confidence that your heavy wide-field eyepiece or camera is securely fastened.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eMirror Diagonal Optics: Maximizing Light for Deep-Sky Views\u003c\/h3\u003e\n\u003cp\u003eThis diagonal uses a mirror surface to bend the light path 90 degrees, a design favored for deep-sky observing. Mirror diagonals typically offer very high reflectivity across the entire visual spectrum, transmitting maximum light from faint galaxies and nebulae to your eye. This makes it an ideal choice for observers using reflectors or SCTs to hunt for faint, diffuse objects like the Veil Nebula (NGC 6960) or the Pinwheel Galaxy (M101).\u003c\/p\u003e\n\u003cp\u003eWhile the optical coatings are highly durable, the only trade-off for any mirror-based diagonal is that the coatings may degrade over many years of use, potentially requiring a recoat. However, for most users, a Baader diagonal will provide decades of high-contrast views.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eBaader ClickLock vs. Thumbscrew Diagonals: An Ergonomic Upgrade\u003c\/h3\u003e\n\u003cp\u003eFor observers who frequently change eyepieces, the ClickLock diagonal is a significant ergonomic improvement over traditional designs. There are no small screws to fumble with in the dark, and the risk of dropping an eyepiece while trying to secure it is greatly reduced.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThumbscrew Diagonal Weakness:\u003c\/strong\u003e Standard diagonals can introduce optical tilt if a screw is overtightened, shifting the focal plane and softening the image. They also provide a less secure grip on heavy accessories.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBaader ClickLock Advantage:\u003c\/strong\u003e The ClickLock's self-centering action and distributed pressure maintain perfect optical alignment regardless of the accessory's weight, preserving the sharpness your telescope is capable of delivering.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhen should I choose the Baader Mirror Diagonal over a prism diagonal?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA \u003cstrong\u003emirror diagonal\u003c\/strong\u003e, like this one, is generally preferred for deep-sky observing with any telescope, especially those with focal ratios of f\/7 or slower. It provides excellent light transmission across all wavelengths. A \u003cstrong\u003eprism diagonal\u003c\/strong\u003e can sometimes be a better choice for high-magnification planetary viewing in refractors, as it introduces no scattered light, but it may not perform as well at very fast focal ratios.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Baader 2\" ClickLock Diagonal handle heavy eyepieces on my Celestron 8\" SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Baader ClickLock diagonal is an excellent match for a Schmidt-Cassegrain Telescope (SCT). Its secure, three-point grip is specifically designed to hold heavy 2\" eyepieces, such as wide-field Naglers or Panoptics, without any wobble or tilt. This ensures that the collimation and alignment of your SCT's optical path are maintained perfectly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the ClickLock mechanism scratch my eyepiece barrels?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. In fact, the ClickLock system is designed to prevent the very scratches and gouges that traditional thumbscrews cause. It applies firm, even pressure using hardened rollers against a compression ring, never making direct metal-on-metal contact with a sharp point.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Baader 2\" ClickLock Diagonal compatible with both refractors and SCTs?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. This diagonal comes with a standard 2\" nosepiece that fits into any 2\" focuser, common on most refractors. For use with an SCT, you will need an SCT-to-2\" adapter that threads onto the rear cell of your telescope, which then allows you to insert the diagonal.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the advantage of the Baader ClickLock Diagonal in cold weather?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe large, knurled locking ring is easy to grip and operate even when wearing thick winter gloves. This is a major advantage over tiny thumbscrews, which can be difficult or impossible to turn with cold hands or gloves, making eyepiece changes much faster and more comfortable during winter observing sessions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I clean the mirror on my Baader ClickLock Diagonal?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe mirror should only be cleaned when absolutely necessary. First, use a bulb blower to remove any loose dust. For fingerprints or stubborn residue, use a dedicated optical cleaning solution and sterile cotton balls or optical wipes. Apply the solution to the cotton, not directly to the mirror, and gently wipe in a single direction. Avoid excessive pressure or circular scrubbing motions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet weight (kg)\u003c\/td\u003e\n\u003ctd\u003e0.48\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDeflection angle\u003c\/td\u003e\n\u003ctd\u003e90°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClamping System\u003c\/td\u003e\n\u003ctd\u003eClickLock\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Diameter \/ Clear Aperture (mm)\u003c\/td\u003e\n\u003ctd\u003e46.6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical length (mm)\u003c\/td\u003e\n\u003ctd\u003e112\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Connection (eyepiece\/-camera-sided)\u003c\/td\u003e\n\u003ctd\u003eø 2\" (50.8mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Connection (lens sided)\u003c\/td\u003e\n\u003ctd\u003eM48, 2\"\/SCT Thread (50.8mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Connection (lens sided)\u003c\/td\u003e\n\u003ctd\u003eø 2\" (50.8mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eMirror Diagonal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Orientation\u003c\/td\u003e\n\u003ctd\u003eErect image, Mirror inverted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReflection surface\u003c\/td\u003e\n\u003ctd\u003eDielectrically coated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eInformation Not Available\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader_Planetarium_Cleaning_and_Maintenance_of_Optics_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBaader Planetarium Cleaning and Maintenance of Optics Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader_Planetarium_Star_Diagonals_T-2_and_2in_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBaader Planetarium Star Diagonals T-2 and 2in Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader_Planetarium_ClickLock_Diagonal_Mirror_2in_M68_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBaader Planetarium ClickLock Diagonal Mirror 2in M68 Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader_Planetarium_ClickLock_Clamps_Product_Information.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBaader Planetarium ClickLock Clamps Product Information\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/baader-planetarium-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eBaader Planetarium Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Baader Planetarium","offers":[{"title":"Default Title","offer_id":44967301611805,"sku":"BAA-2956100","price":431.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader-Mirror-Diagonal-2-inch-ClickLock-1__35364.1597110552.1280.1280.jpg?v=1684340204"},{"product_id":"baader-90-zenith-prism-diagonal-w-32mm-prism-1-25","title":"Baader 90° Zenith Prism Diagonal w\/ 32mm Prism - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e90° Zenith Prism Diagonal\u003c\/li\u003e\n\u003cli\u003eOversized 32mm Prism\u003c\/li\u003e\n\u003cli\u003e1.25\" Barrel Format\u003c\/li\u003e\n\u003cli\u003eBaader T-2 System Threads\u003c\/li\u003e\n\u003cli\u003eIncludes 1.25\" Eyepiece Holder \u0026amp; Nosepiece\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eBaader 90° Zenith Prism Diagonal w\/ 32mm Prism - 1.25\"\u003c\/h2\u003e\n\u003cp\u003eThe Baader 90° Zenith Prism Diagonal features an oversized 32mm prism to ensure full, unvignetted illumination for any 1.25\" eyepiece. Built around the versatile Baader T-2 thread system, this diagonal includes a 1.25\" nosepiece and eyepiece holder, providing a high-contrast optical core for refractors and Schmidt-Cassegrains right out of the box.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe 32mm Prism: High-Contrast Views for Refractors\u003c\/h3\u003e\n\u003cp\u003eAt the heart of this diagonal is a large 32mm prism, which provides a generous clear aperture. This size prevents the field-edge dimming that can occur in smaller diagonals when using long focal length 1.25\" eyepieces. Prism diagonals are renowned for delivering higher contrast than mirror-based alternatives, making them a superior choice for detailed lunar and planetary observation in refractors or SCTs.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe M42 T-2 System: Beyond 1.25\" Connections\u003c\/h3\u003e\n\u003cp\u003eThis is more than a simple diagonal; it's a component of the Baader Astro T-2 System. The central prism housing features standard T-2 (M42x0.75) threads on both sides, allowing for a rigid, direct-threaded connection to a vast ecosystem of adapters, focusers, and cameras. While it functions perfectly as a 1.25\" visual accessory with the included parts, the T-2 system allows you to build a custom, secure imaging or visual train without the flexure of standard slip-fit connections.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eBaader 32mm Prism vs. 1.25\" Mirror Diagonals: The Contrast Advantage\u003c\/h3\u003e\n\u003cp\u003eWhen choosing a diagonal, the primary alternative is a dielectric mirror. While high-quality mirror diagonals offer slightly higher light transmission, this Baader 32mm prism provides a tangible advantage in image contrast. This makes subtle details on Jupiter's cloud bands or fine rilles on the Moon's surface appear more distinct.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMirror Diagonal Advantage:\u003c\/strong\u003e Typically offers slightly better color correction in very fast (f\/5 and below) refractors and marginally higher light throughput.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBaader Prism Advantage:\u003c\/strong\u003e Delivers noticeably higher contrast, ideal for high-magnification planetary viewing. The prism surface does not rely on a coating that can degrade over time, ensuring consistent optical quality for years.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy choose the Baader 32mm prism diagonal for a refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA prism diagonal is an excellent match for refractors, especially for lunar and planetary observing. The inherent high-contrast nature of a prism enhances subtle surface details that can be washed out with mirror diagonals. The \u003cstrong\u003eoversized 32mm prism\u003c\/strong\u003e in this Baader model ensures it won't vignette the view of even the widest-field 1.25\" eyepieces.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Baader 90° Prism Diagonal suitable for a Newtonian telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. Newtonian reflectors require a secondary mirror to direct light out the side of the tube and do not use a diagonal in the focuser. Furthermore, adding this Baader diagonal would push the focal point too far out, making it impossible to reach focus. This diagonal is designed for refractors, Schmidt-Cassegrains, and Maksutov-Cassegrains.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the T-2 thread system on this Baader diagonal?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe T-2 system is a universal standard (M42x0.75 thread) used by Baader Planetarium to create a modular ecosystem of astronomy accessories. The body of this \u003cstrong\u003eBaader 90° Prism Diagonal\u003c\/strong\u003e has T-2 threads on both the telescope and eyepiece sides, allowing you to replace the included 1.25\" adapters with other T-2 components for direct, secure connections to cameras, off-axis guiders, or other accessories.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use 2\" filters with the Baader 1.25\" Prism Diagonal?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNot directly with the supplied 1.25\" nosepiece. The included nosepiece has threads for standard 1.25\" filters. To use 2\" filters, you would need to utilize the T-2 thread system to adapt the diagonal to a 2\" focuser or filter wheel, which would require separate Baader T-2 adapters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 32mm prism in this Baader diagonal compare to a mirror for viewing Saturn?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor a target like Saturn, the Baader \u003cstrong\u003e32mm prism diagonal\u003c\/strong\u003e will typically provide a higher-contrast view, making the Cassini Division and subtle cloud banding stand out more sharply. While a high-quality dielectric mirror might be marginally brighter, the improvement in contrast from the prism is often more beneficial for resolving fine planetary detail.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat parts do I need to attach a camera to the Baader T-2 Prism Diagonal?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou would unscrew the 1.25\" eyepiece holder to reveal the female T-2 threads. From there, you would need a T-2 extension tube of the correct length to achieve focus, and a T-2 to camera-mount adapter (e.g., T-2 to Canon EOS or T-2 to M48). The specific combination of adapters depends on your camera's back focus requirements.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet weight (kg)\u003c\/td\u003e\n\u003ctd\u003e0.20\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDeflection angle\u003c\/td\u003e\n\u003ctd\u003e90°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAR-Coating\u003c\/td\u003e\n\u003ctd\u003ePhantom Coating® Group\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Diameter \/ Clear Aperture (mm)\u003c\/td\u003e\n\u003ctd\u003e32\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical length (mm)\u003c\/td\u003e\n\u003ctd\u003e64\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Connection (eyepiece\/-camera-sided)\u003c\/td\u003e\n\u003ctd\u003eø 1¼\" (31.75 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Connection (eyepiece\/-camera-sided)\u003c\/td\u003e\n\u003ctd\u003eM42 x 0.75 (T-2)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Connection (lens sided)\u003c\/td\u003e\n\u003ctd\u003eM42 x 0.75 (T-2)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Connection (lens sided)\u003c\/td\u003e\n\u003ctd\u003eø 1¼\" (31.75 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eStar Diagonal Prism\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Orientation\u003c\/td\u003e\n\u003ctd\u003eErect image, Mirror inverted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReflection surface\u003c\/td\u003e\n\u003ctd\u003eTotal reflection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader_Planetarium_Astro_T-2_System_Connections_Overview.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBaader Planetarium Astro T-2 System Connections Overview\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader_Planetarium_Star_Diagonals_T-2_and_2in_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBaader Planetarium Star Diagonals T-2 and 2in Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader_Planetarium_Astro_T-2_System_Parts_List.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBaader Planetarium Astro T-2 System Parts List\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/baader-planetarium-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eBaader Planetarium Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Baader Planetarium","offers":[{"title":"Default Title","offer_id":44967301644573,"sku":"BAA-2456005K","price":198.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Baader-90-degree-Zenith-Prism-Diagonal-with-32mm-Prism-1-25-inch-1__95816.1597110553.1280.1280.jpg?v=1684340237"},{"product_id":"baader-star-diagonal-prism-w-zeiss-spec-prism-bbhs-coating-t-2","title":"Baader Star Diagonal Prism w\/ Zeiss Spec Prism \u0026 BBHS Coating - T-2","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eZeiss-Specification Right-Angle Prism\u003c\/li\u003e\n\u003cli\u003eBaader BBHS® (Broadband Hard Silver) Coatings\u003c\/li\u003e\n\u003cli\u003eT-2 (M42x0.75) Threads on Input and Output Faces\u003c\/li\u003e\n\u003cli\u003eSolid, All-Metal Housing for Maximum Rigidity\u003c\/li\u003e\n\u003cli\u003eUltra-Short Optical Path Design\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eBaader Star Diagonal Prism w\/ Zeiss Spec Prism \u0026amp; BBHS Coating - T-2\u003c\/h2\u003e\n\u003cp\u003eThe Baader T-2 Star Diagonal Prism delivers superior image fidelity using a genuine Zeiss-specification prism with optical surfaces boasting a planarity approximately 5x better than standard prisms. This high-precision optic is housed in a solid metal body featuring T-2 (M42x0.75) threads on both sides, creating a rigid, versatile, and extremely short connection within any imaging or visual train.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA Prism 5x More Precise Than Standard Designs\u003c\/h3\u003e\n\u003cp\u003eAt the heart of this diagonal is a right-angle prism manufactured to stringent Zeiss specifications. The planarity and conformity of the prism faces are held to a much higher standard than those found in typical diagonals, resulting in higher contrast and sharpness, especially at high magnifications. This prevents the subtle image degradation that can soften planetary details or split close double stars.\u003c\/p\u003e\n\u003cp\u003eThe prism is treated with Baader's Broadband Hard Silver (BBHS®) coatings. This advanced coating system provides exceptionally high reflectivity across the visual spectrum, while a dielectric overcoat seals the silver layer, protecting it from environmental degradation and allowing for safe, gentle cleaning for a lifetime of use.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe T-2 (M42x0.75) System: A Compact, Direct-Threaded Connection\u003c\/h3\u003e\n\u003cp\u003eUnlike diagonals that rely on standard 1.25\" or 2\" barrels, the Baader T-2 Prism uses the Astro T-2 (M42x0.75) thread system on both its input and output faces. This design philosophy offers two key advantages: an ultra-short optical path and unparalleled system modularity. The direct-threaded connection eliminates any potential for tilt or flexure that can occur with slip-fit or compression ring holders.\u003c\/p\u003e\n\u003cp\u003eThis compact, threaded body is the core of a completely customizable system. By choosing from Baader's extensive line of T-2 adapters, you can configure the diagonal for any telescope's focuser and connect any eyepiece, camera, or binoviewer with minimal added length—a critical factor for telescopes with limited back focus, such as Newtonian reflectors or refractors with focal reducers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eBaader T-2 Prism vs. Standard 1.25\" Mirror Diagonals\u003c\/h3\u003e\n\u003cp\u003eWhile a quality mirror diagonal offers excellent views, the Baader T-2 Prism provides a distinct set of advantages for the critical observer.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMirror Diagonal Advantage:\u003c\/strong\u003e A dielectric mirror diagonal is perfectly achromatic and introduces zero false color, making it an excellent choice for very fast (f\/5 or below) refractors where a prism can introduce a tiny amount of chromatic aberration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBaader Prism Advantage:\u003c\/strong\u003e The sealed prism surface cannot degrade over time like an exposed mirror coating can. Prisms typically exhibit less light scatter than mirrors, leading to slightly higher contrast on bright objects like the Moon and planets. Most importantly, the T-2 threaded system provides a secure, perfectly orthogonal connection that a standard 1.25\" slip-fit diagonal cannot guarantee.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the advantage of the Baader T-2 Prism Diagonal's threaded connection?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe T-2 (M42x0.75) threaded connections on both sides create a solid, flex-free optical train. Unlike standard slip-fit diagonals that can tilt slightly in the focuser, the threaded system ensures perfect alignment and orthogonality, which is critical for high-resolution imaging and visual observation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this Baader T-2 Prism Diagonal work with my Schmidt-Cassegrain Telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it is an excellent choice for an SCT. You will need the appropriate T-2 adapters to connect it to your telescope's rear cell (typically a T-2 to SCT thread adapter) and a T-2 eyepiece holder (like the Baader ClickLock) for your eyepieces. The short optical path of the prism body helps conserve precious back focus.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy choose the Baader T-2 Prism over a mirror diagonal for viewing Jupiter on my refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor planetary viewing on most refractors (f\/6 and slower), a high-quality prism often delivers superior contrast. The prism's lower light scatter can make subtle details in Jupiter's cloud belts or the Cassini Division in Saturn's rings appear more distinct. The rigid T-2 connection also prevents any image shift when focusing at high power.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat are Baader's BBHS® coatings on this T-2 Star Diagonal?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eBBHS®\u003c\/strong\u003e stands for Broadband Hard Silver. It's a multi-layer coating system where a layer of silver provides very high reflectivity across the entire visual spectrum. This silver layer is then protected by a hard, transparent dielectric coating, making it as durable and easy to clean as a standard dielectric mirror while retaining silver's high reflectance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat adapters do I need to use the Baader T-2 Prism Diagonal with 1.25\" eyepieces?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eTo use standard 1.25\" eyepieces, you will need a T-2 eyepiece holder. Baader offers several options, with the most popular being the \u003cstrong\u003eT-2 \/ 1.25\" ClickLock Eyepiece Clamp (#2458100)\u003c\/strong\u003e. This threads directly onto the output side of the prism diagonal and provides a secure, self-centering clamp for your eyepieces.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the Baader Zeiss-spec prism introduce any color error?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAll prisms introduce a minuscule amount of chromatic aberration, as light passes through the glass. In telescopes with focal ratios of f\/7 or slower, this effect is completely negligible and invisible. In very fast refractors (f\/5 or faster), a trace of false color may be detectable by the most critical observers on extremely bright targets, in which case a high-quality dielectric mirror diagonal might be preferred.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet weight (kg)\u003c\/td\u003e\n\u003ctd\u003e0.18\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDeflection angle\u003c\/td\u003e\n\u003ctd\u003e90°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAR-Coating\u003c\/td\u003e\n\u003ctd\u003ePhantom Coating® Group\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClamping System\u003c\/td\u003e\n\u003ctd\u003eno clamp\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Diameter \/ Clear Aperture (mm)\u003c\/td\u003e\n\u003ctd\u003e34\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical length (mm)\u003c\/td\u003e\n\u003ctd\u003e38.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Connection (eyepiece\/-camera-sided)\u003c\/td\u003e\n\u003ctd\u003eM34\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Connection (eyepiece\/-camera-sided)\u003c\/td\u003e\n\u003ctd\u003eM42 x 0.75 (T-2)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Connection (lens sided)\u003c\/td\u003e\n\u003ctd\u003eM42 x 0.75 (T-2)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eStar Diagonal Prism\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Orientation\u003c\/td\u003e\n\u003ctd\u003eErect image, Mirror inverted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReflection surface\u003c\/td\u003e\n\u003ctd\u003eSealed BBHS coating\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGlas path\u003c\/td\u003e\n\u003ctd\u003e36 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader_Planetarium_Astro_T-2_System_Connections_Overview.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBaader Planetarium Astro T-2 System Connections Overview\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader_Planetarium_Star_Diagonals_T-2_and_2in_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBaader Planetarium Star Diagonals T-2 and 2in Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader_Planetarium_Astro_T-2_System_Parts_List.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBaader Planetarium Astro T-2 System Parts List\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/baader-planetarium-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eBaader Planetarium Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Baader Planetarium","offers":[{"title":"Default Title","offer_id":44967301710109,"sku":"BAA-2456095","price":354.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Baader-Star-Diagonal-Prism-with-Zeiss-Spec-Prism-BBHS-Coating-T-2-1__34003.1597110557.1280.1280.jpg?v=1684340260"},{"product_id":"baader-90-prism-diagonal-w-32mm-prism-t-2","title":"Baader 90° Prism Diagonal w\/ 32mm Prism - T-2","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e90° comfortable viewing angle\u003c\/li\u003e\n\u003cli\u003eLarge 32mm prism for full field illumination\u003c\/li\u003e\n\u003cli\u003eBaader T-2 thread system for modular connections\u003c\/li\u003e\n\u003cli\u003eMaxbright-series prism for high-contrast images\u003c\/li\u003e\n\u003cli\u003eOptimized for planetary and lunar observing with refractors\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eBaader 90° Prism Diagonal w\/ 32mm Prism - T-2\u003c\/h2\u003e\n\u003cp\u003eThe Baader 90° Prism Diagonal is built around a substantial 32mm prism, providing a full-aperture light path for T-2 system components. This 90° diagonal is designed for maximum modularity, offering T-2 threads on both the telescope and eyepiece sides to create a completely rigid, flexure-free optical train.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe 32mm Prism: High-Contrast Views for Refractors\u003c\/h3\u003e\n\u003cp\u003eThis diagonal's core is a precision-polished 32mm prism. Unlike mirror diagonals that can develop scatter-inducing micro-scratches over time, a prism's hypotenuse surface is protected, delivering consistently high-contrast views ideal for resolving fine detail on Jupiter's cloud bands, Saturn's rings, and lunar crater walls. The generous 32mm size ensures that the light cone from the telescope passes through without vignetting, fully illuminating the field of view of most 1.25\" eyepieces.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eT-2 System Modularity: Build Your Ideal Optical Train\u003c\/h3\u003e\n\u003cp\u003eThe true power of this diagonal lies in its integration with the Baader T-2 Astro System. With female T-2 threads on both the input and output faces, you can directly attach a vast range of adapters. This allows you to build a custom, rock-solid imaging or visual setup, eliminating the alignment issues and potential tilt common with standard slip-fit diagonals. You can configure it with a 1.25\" ClickLock eyepiece clamp, a 2\" nosepiece, or connect it directly to T-2 threaded flatteners and cameras.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePlease note:\u003c\/strong\u003e This is a core system component. To use it, you must purchase the appropriate T-2 nosepiece for your focuser and a T-2 eyepiece holder (such as a ClickLock or standard clamp) separately.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003ePrism vs. Mirror: Choosing the Right 90° Diagonal\u003c\/h3\u003e\n\u003cp\u003eChoosing between a prism and a mirror diagonal depends on your telescope and primary observing targets. While both provide a 90° viewing angle, their optical properties differ.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMirror Diagonals:\u003c\/strong\u003e A high-quality dielectric mirror offers slightly higher light transmission and superior color correction, making it a better choice for fast refractors (f\/7 or faster) and for deep-sky observing where every photon counts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrism Diagonals:\u003c\/strong\u003e This Baader 32mm prism excels at reducing light scatter, which measurably increases image contrast. This makes subtle planetary and lunar details pop. While it can introduce a negligible amount of chromatic aberration in very fast systems, its performance in f\/8 or slower refractors is often considered superior for high-magnification targets.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the advantage of the Baader T-2 Prism Diagonal's thread system?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eBaader T-2 thread system\u003c\/strong\u003e allows you to create a completely modular and rigid connection between your telescope, diagonal, and eyepiece or camera. This eliminates the potential for tilt, sag, or poor alignment that can occur with standard 1.25\" or 2\" slip-fit accessories, which is critical for imaging and high-magnification visual work.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Baader 90° Prism Diagonal work with my 2\" focuser?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, but it requires the correct adapters, which are sold separately. To connect the \u003cstrong\u003eBaader T-2 Prism Diagonal\u003c\/strong\u003e to a 2\" focuser, you will need a Baader T-2 to 2\" nosepiece. On the other side, you will need a T-2 compatible eyepiece holder, such as a Baader 1.25\" ClickLock clamp.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs a 32mm prism diagonal better than a mirror diagonal for my refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt depends on your telescope's focal ratio and your targets. For \u003cstrong\u003eslower refractors (f\/8 and longer)\u003c\/strong\u003e and high-magnification viewing of the Moon and planets, a prism diagonal like this Baader 32mm model often provides higher contrast. For \u003cstrong\u003efaster refractors (f\/7 and shorter)\u003c\/strong\u003e or deep-sky observing, a quality dielectric mirror diagonal is typically preferred for its higher light transmission and better color correction.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Baader T-2 90° diagonal for imaging Jupiter with my 100mm f\/9 refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. That is an ideal application for this diagonal. The high-contrast view delivered by the \u003cstrong\u003e32mm prism\u003c\/strong\u003e will help resolve fine details in Jupiter's cloud belts and the Great Red Spot. The rigid T-2 connections will also ensure your planetary camera remains perfectly aligned with the optical axis, free from tilt or flexure.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy does this Baader diagonal use a 32mm prism instead of a mirror?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA prism is used to maximize image contrast by minimizing light scatter. The internal reflection surface is perfectly smooth and protected from environmental degradation. This makes the \u003cstrong\u003eBaader 90° Prism Diagonal\u003c\/strong\u003e an excellent choice for observers who prioritize the sharpest possible views of bright objects like the Moon, planets, and double stars.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Baader 32mm Prism Diagonal vignette with a Tele Vue 24mm Panoptic eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e32mm prism\u003c\/strong\u003e provides a very large clear aperture designed to fully illuminate the field stops of nearly all 1.25\" eyepieces, including wide-field designs like the 24mm Panoptic. When properly adapted within the T-2 system, you should not experience any significant vignetting caused by the diagonal itself.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Name\u003c\/td\u003e\n\u003ctd\u003eBaader 90° Prism Diagonal w\/ 32mm Prism - T-2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiagonal Angle\u003c\/td\u003e\n\u003ctd\u003e90°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrism Size\u003c\/td\u003e\n\u003ctd\u003e32mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTelescope Connection\u003c\/td\u003e\n\u003ctd\u003eFemale T-2 Thread (M42 x 0.75)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEyepiece Connection\u003c\/td\u003e\n\u003ctd\u003eFemale T-2 Thread (M42 x 0.75)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeries\u003c\/td\u003e\n\u003ctd\u003eMaxbright\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet weight (kg)\u003c\/td\u003e\n\u003ctd\u003e0.13\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAR-Coating\u003c\/td\u003e\n\u003ctd\u003ePhantom Coating® Group\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClamping System\u003c\/td\u003e\n\u003ctd\u003eno clamp\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical length (mm)\u003c\/td\u003e\n\u003ctd\u003e35\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eStar Diagonal Prism\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Orientation\u003c\/td\u003e\n\u003ctd\u003eErect image, Mirror inverted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReflection surface\u003c\/td\u003e\n\u003ctd\u003eTotal reflection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBaader 90° T-2 Prism Diagonal Body\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003eNote: Nosepiece and eyepiece holder sold separately.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader_Planetarium_Astro_T-2_System_Connections_Overview.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBaader Planetarium Astro T-2 System Connections Overview\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader_Planetarium_Star_Diagonals_T-2_and_2in_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBaader Planetarium Star Diagonals T-2 and 2in Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader_Planetarium_Astro_T-2_System_Parts_List.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBaader Planetarium Astro T-2 System Parts List\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/baader-planetarium-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eBaader Planetarium Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Baader Planetarium","offers":[{"title":"Default Title","offer_id":44967301742877,"sku":"BAA-2456005","price":161.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader-90-degree-Prism-Diagonal-with-32mm-Prism-T-2-1__01419.1597110560.1280.1280.jpg?v=1684340263"},{"product_id":"baader-q-turret-quad-eyepiece-revolver-1-25","title":"Baader Q-Turret Quad Eyepiece Revolver - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eHolds four 1.25\" eyepieces for rapid switching\u003c\/li\u003e\n\u003cli\u003eLightweight design is compatible with most focusers\u003c\/li\u003e\n\u003cli\u003eMetal threads for secure connections\u003c\/li\u003e\n\u003cli\u003eAccepts planetary cameras with a 1.25\" nosepiece\u003c\/li\u003e\n\u003cli\u003eDirectly threads onto the optional Baader Q-Barlow lens\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eBaader Q-Turret Quad Eyepiece Revolver - 1.25\"\u003c\/h2\u003e\n\u003cp\u003eThe Baader Q-Turret Quad Eyepiece Revolver transforms your observing workflow by holding four 1.25\" eyepieces or a planetary camera, all parfocal and ready for instant use. This 4-position turret eliminates fumbling with eyepiece cases in the dark, allowing you to switch between finding, viewing, and high-power magnifications with a simple, positive click.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eInstant Magnification Changes: The 4-Position Eyepiece Revolver\u003c\/h3\u003e\n\u003cp\u003eThe core function of the Q-Turret is to streamline your observing session. You can populate its four 1.25\" ports with a complete observing set—for example, a low-power eyepiece for locating an object, a medium-power one for context, and a high-power eyepiece for detailed views of planets or double stars. A fourth slot can hold a planetary camera, letting you switch from visual observation to imaging in seconds.\u003c\/p\u003e\n\u003cp\u003eThis design is especially effective for planetary viewing, where moments of steady seeing are fleeting. You no longer risk losing the perfect view while changing eyepieces. For added versatility, the turret is designed to accept the Baader Q-Barlow lens, which screws directly into the base to double the magnification of all four mounted eyepieces.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eLightweight Design with 1.25\" Metal Threads\u003c\/h3\u003e\n\u003cp\u003eBaader designed the Q-Turret with a lightweight yet robust plastic housing to ensure compatibility with a wide range of telescopes without overloading their focusers. This makes it a practical accessory for smaller refractors and Schmidt-Cassegrain telescopes where balance is critical. For durability and a secure fit, all screw threads are made of metal.\u003c\/p\u003e\n\u003cp\u003eThe turret fits most refractor and Schmidt-Cassegrain telescopes directly. While it can be used with Newtonian reflectors, this is a key trade-off: it requires significant backfocus, which many Newtonians do not possess without modification. Always confirm your telescope has sufficient inward focuser travel before use.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Baader Q-Turret improve planetary observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Baader Q-Turret allows you to switch from a low-power finding eyepiece to a high-power planetary eyepiece in an instant. This lets you take immediate advantage of moments of clear, steady seeing without having to remove, store, and insert a different eyepiece, which could cause you to lose the object or the perfect view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Baader Q-Turret work with my Newtonian telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt depends. The Baader Q-Turret requires a significant amount of backfocus (inward focuser travel) to reach focus. While most refractors and SCTs have ample backfocus, many Newtonian reflectors do not. You must verify that your specific Newtonian has enough backfocus to accommodate the turret's light path.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Baader Q-Turret to image Jupiter with my 8\" SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this is an ideal use case. You can install a low-power eyepiece to locate and center Jupiter, then rotate the Baader Q-Turret to bring your 1.25\" planetary camera into the light path for imaging. For even higher magnification, you can thread the optional Baader Q-Barlow directly to the turret.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the Baader Q-Turret made of?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Baader Q-Turret features a lightweight and robust plastic housing to minimize weight on the focuser. Critically, all the screw threads that connect to your telescope and hold the eyepieces are made of \u003cstrong\u003emetal\u003c\/strong\u003e for durability and a secure connection.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use a Barlow lens with the Baader Q-Turret?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The Baader Q-Turret is specifically designed for use with the Baader Q-Barlow lens. The Barlow screws directly into the 1.25\" nosepiece of the turret, effectively doubling the magnification of every eyepiece you have installed in the revolver.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Baader Q-Turret help when observing the Orion Nebula (M42)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Baader Q-Turret allows you to seamlessly transition between different views of M42. You can use a wide-field eyepiece to frame the entire nebula, then click to a higher-power eyepiece to resolve the four stars of the Trapezium cluster at its core, all without taking your eye away from the telescope.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet weight (kg)\u003c\/td\u003e\n\u003ctd\u003e0.11\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParfocal Eyepieces\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size (in)\u003c\/td\u003e\n\u003ctd\u003e1¼\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThreaded for filters\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDustcaps\u003c\/td\u003e\n\u003ctd\u003eNo Dustcaps included\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEyecups\u003c\/td\u003e\n\u003ctd\u003eNo eyecups included\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEyepiece Series\u003c\/td\u003e\n\u003ctd\u003eClassic (Q-Turret)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical length (mm)\u003c\/td\u003e\n\u003ctd\u003e37.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/davidastro.com\/pages\/baader-planetarium-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eBaader Planetarium Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Baader Planetarium","offers":[{"title":"Default Title","offer_id":44967316554013,"sku":"BAA-2957010","price":81.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Baader-Q-Turret-Quad-Eyepiece-Revolver-1-25-inch-1__25418.1597110677.1280.1280.jpg?v=1684340485"},{"product_id":"apm-dielectric-mirror-star-diagonal-2","title":"APM Dielectric Mirror Star Diagonal - 2\"","description":"\u003c!-- more --\u003e\u003cb\u003eAPM 2 inch star diagonal mirror with 99% di-electric coating with fast-lock\u003c\/b\u003e\u003cbr\u003e\u003cbr\u003e\u003ci\u003eThe diagonal mirror is produced by APM-Telescopes with highest quality\u003c\/i\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eOptics\u003c\/b\u003e\u003cbr\u003e\u003cbr\u003eHighest precision and image brightness due to the new di-eletric broadband coating with 99 % reflection.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eMechanics\u003c\/b\u003e\u003cbr\u003e\u003cbr\u003eThe stable body is precisely CNC milled. The equipment is secured with the 2 inch fast APM-lock. Thereby the 2 inch equipment is fasten by a centering clamping which ensures an exact alignment on the optical axis.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eDelivery contents\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\u003cli\u003e2 inch diagonal mirror w. Adapter 2\"\/1.25\" \u003c\/li\u003e\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cdiv data-custom-tab\u003e\n\u003cp data-custom-tab-title\u003eSpecifications\u003c\/p\u003e\n\u003cdiv\u003e\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eWeight:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e560 g\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/div\u003e\n\u003cdiv data-custom-tab\u003e\n\u003cp data-custom-tab-title\u003eSpecifications\u003c\/p\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eConnection to eyepiece:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e2\"\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eCoating:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e99 % broadband di-eletric reflection\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eUnobstructed diameter:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e43 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eOptical Length:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e125 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cbr\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"APM","offers":[{"title":"Default Title","offer_id":44967663075613,"sku":"APM-2-diag-DX-FL","price":253.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/APM-Dielectric-Mirror-Star-Diagonal-2-inch-1__76232.1600124036.1280.1280.jpg?v=1684345420"},{"product_id":"apm-prism-diagonal-2","title":"APM Prism Diagonal - 2\"","description":"\u003c!-- more --\u003e\u003cb\u003eAPM 2 inch Diagonalprism with fast-lock and ultra broadband coating\u003cbr\u003e\u003cbr\u003e\u003c\/b\u003e\u003ci\u003eThe prism is produced by APM-Telescopes with highest  quality\u003c\/i\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eOptics\u003c\/b\u003e\u003cbr\u003e\u003cbr\u003eHighest precision and image brightness due to the new ultra broadband coating. Glasmaterial is BK7 glass, we also call it as K9 in Chinese\u003cbr\u003e\u003cbr\u003e\u003cb\u003eMechanics\u003c\/b\u003e\u003cbr\u003e\u003cbr\u003eThe stable body is precisely CNC milled. The equipment is secured with the 2 inch fast APM-lock. Thereby the 2 inch equipment is fasten by a centering clamping which ensures an exact alignment on the optical axis.\u003cbr\u003e\u003cbr\u003e\u003cu\u003e\u003cb\u003eDelivery contents\u003c\/b\u003e\u003c\/u\u003e\u003cbr\u003e\u003cul\u003e\u003cli\u003e2 inch Diagonalprism with adapter 2\"\/1.25\"\u003c\/li\u003e\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cdiv data-custom-tab\u003e\n\u003cp data-custom-tab-title\u003eSpecifications\u003c\/p\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eConnection to eyepiece:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e2\"\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eCoating:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003eUltrabroadband coating\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eUnobstructed diameter:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e43 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eOptical Length:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e125 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eWeight:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e624 g\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cbr\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"APM","offers":[{"title":"Default Title","offer_id":44967663108381,"sku":"APM-2-diag-PR-FL","price":309.0,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/APM-Prism-Diagonal-2-inch-1__11038.1600124036.1280.1280.jpg?v=1684345425"},{"product_id":"apm-90-erect-image-prism-2","title":"APM 90° Erect Image Prism - 2\"","description":"\u003c!-- more --\u003e\u003cb\u003eAPM 2 inch Erect-Image-prism with fast-lock and ultra broadband coating\u003c\/b\u003e\u003cbr\u003e\u003cbr\u003e\u003ci\u003eThe erecting-prism is produced by APM-Telescopes with highest  quality\u003c\/i\u003e\u003cbr\u003e\u003cbr\u003eThis erect image prism for astronomical observation offers the highest accuracy for maximum magnifications and image brightness, thanks to the new ultra-broadband compensation. It is manufactured in highest Astro quality, the roof edge is almost invisible. With a 46 mm free aperture, it also offers the largest opening on the world market, which means that all 2 \"eyepieces can be used without vignetting.\u003cbr\u003eThis 2-inch APM 90-degree erect image prism is far superior to any other erect image  prism, making it also suitable for very experienced planet observers.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eOptics\u003c\/b\u003e\u003cbr\u003e\u003cbr\u003eHighest precision and image brightness due to the new ultra broadband coating.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eMechanics\u003c\/b\u003e\u003cbr\u003e\u003cbr\u003eThe stable body is precisely CNC milled. The equipment is secured with the 2 inch fast APM-lock. Thereby the 2 inch equipment is fasten by a centering clamping which ensures an exact alignment on the optical axis.\u003cbr\u003e\u003cbr\u003e\u003cu\u003e\u003cb\u003eDelivery contents:\u003c\/b\u003e\u003c\/u\u003e\u003cbr\u003e\u003cul\u003e\u003cli\u003e2 inch Erect Imageprism with adapter 2\"\/1.25\"\u003c\/li\u003e\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cbr\u003e\u003cbr\u003e\u003cbr\u003e\u003cbr\u003e\u003cdiv data-custom-tab\u003e\n\u003cp data-custom-tab-title\u003eSpecifications\u003c\/p\u003e\n\u003cdiv\u003e\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eWeight:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e618g\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/div\u003e\n\u003cdiv data-custom-tab\u003e\n\u003cp data-custom-tab-title\u003eSpecifications\u003c\/p\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eConnection to eyepiece:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e2\"\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eCoating:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003eUltrabroadband coating\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eUnobstructed diameter:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e46mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eOptical Length:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e113 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cbr\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"APM","offers":[{"title":"Default Title","offer_id":44967663370525,"sku":"APM-2-diag-EI-PR-FL","price":414.0,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/APM-90-degree-Erect-Image-Prism-2-inch-1__52764.1600124036.1280.1280.jpg?v=1684345431"},{"product_id":"dav-diag-1-25","title":"David Astro 90° Diagonal - 1.25\"","description":"\u003c!-- more --\u003e\n\u003cp\u003e\u003cspan\u003eThe \u003c\/span\u003e\u003cstrong\u003e1.25\" Mirror Diagonal\u003c\/strong\u003e\u003cspan\u003e is a must-have accessory for astronomers, providing a comfortable viewing angle and improved image quality during telescope observations. Designed to reflect light at a 90-degree angle, this diagonal makes it easier to observe objects high in the sky without straining your neck.\u003c\/span\u003e\u003c\/p\u003e","brand":"David Astro","offers":[{"title":"Default Title","offer_id":49171614597405,"sku":"DAV-DIAG-1.25","price":59.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/DAV-DIAG-1.25.jpg?v=1726775167"},{"product_id":"david-astro-penta-prism-diagonal-1-25","title":"David Astro Penta Prism Diagonal - 1.25\"","description":"\u003cp\u003eThe David Astro Penta Prism 90-Degree Diagonal is a non inverting non reversing diagonal. It’s particularly suited for use with the David Astro Premium Linear BinoViewer, where its unique optical design delivers an accurate image orientation, eliminating the need for image inversion or mental adjustments common with traditional star diagonals.\u003c\/p\u003e\n\u003cp\u003eAt the heart of this diagonal is a pentagonal-shaped BK-7 glass prism, multi-coated on its transmitting surfaces and dielectric-coated on the reflective surfaces, which maximizes light transmission to the eyepiece. Unlike standard star diagonals that produce a mirror-reversed image, the Pentaprism Diagonal preserves the natural left-to-right orientation, making it invaluable for star navigation and terrestrial applications.\u003c\/p\u003e\n\u003cp\u003eThis 1.25” diagonal features a non-marring compression ring collar and a tapered barrel for secure attachment to any telescope focuser, and it’s threaded for 1.25” filters. With a generous clear aperture of 29mm, the diagonal avoids vignetting even with long focal length and wide-angle eyepieces, preserving field brightness and edge-to-edge clarity.\u003c\/p\u003e\n\u003cp\u003eDesigned with an optical path length (backfocus requirement) of 120mm, our Pentaprism Diagonal ensures compatibility with most telescope setups. When paired with the David Astro Premium Linear BinoViewer, it provides a correctly oriented view, ideal for terrestrial observation where orientation accuracy is essential. However, it may not yield the same results with other binoviewers that lack an integrated image-erecting lens.\u003c\/p\u003e\n\u003cp\u003eEnhance your observing experience with the David Astro Pentaprism Diagonal, the ideal choice for astronomers and terrestrial viewers seeking clarity and orientation without sacrificing image quality.\u003c\/p\u003e","brand":"David Astro","offers":[{"title":"Default Title","offer_id":49365734981917,"sku":"DAV-PENTA-1.25","price":199.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/DAV-PENTA-125.jpg?v=1731532016"},{"product_id":"david-astro-99-dielectric-twist-lock-diagonal-2","title":"David Astro 99% Dielectric Twist-Lock Diagonal - 2\"","description":"\u003c!-- more --\u003e\u003cp\u003eThe 2\" 99% Dielectric Twist-Lock Diagonal is an essential upgrade for astronomers seeking the best in optical performance and convenience. This premium diagonal features 99% dielectric coatings, ensuring exceptional light transmission and durability. With dielectric coatings, you gain a brighter, sharper image with enhanced contrast, as the high reflectivity minimizes light loss across the optical path – perfect for observing fine planetary details, star clusters, and deep-sky objects.\u003c\/p\u003e\n\u003cp\u003eEquipped with an innovative twist-lock mechanism, this diagonal provides a secure, centered hold for your eyepieces and accessories. Simply twist to lock your eyepiece in place – no more fumbling with thumbscrews or misalignments. This mechanism not only protects your equipment but also ensures optimal alignment for the best possible image quality, making it a convenient and reliable addition to your telescope setup.\u003c\/p\u003e\n\u003cp\u003eThe 2” format is compatible with standard 2” focusers, and its wide clear aperture is designed to support even large, wide-field eyepieces without vignetting. This twist-lock diagonal is built to last, with an anodized aluminum body that’s as durable as it is lightweight.\u003c\/p\u003e","brand":"David Astro","offers":[{"title":"Default Title","offer_id":49365752348957,"sku":"DAV-DIG-TL-2","price":219.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/DAV-DIG-TL-2.jpg?v=1731533415"},{"product_id":"david-astro-99-dielectric-twist-lock-diagonal-1-25","title":"David Astro 99% Dielectric Twist-Lock Diagonal - 1.25\"","description":"\u003c!-- more --\u003e\n\u003cp\u003eThe 1.25\" 99% Dielectric Twist-Lock Diagonal is an essential upgrade for astronomers seeking the best in optical performance and convenience. This premium diagonal features 99% dielectric coatings, ensuring exceptional light transmission and durability. With dielectric coatings, you gain a brighter, sharper image with enhanced contrast, as the high reflectivity minimizes light loss across the optical path – perfect for observing fine planetary details, star clusters, and deep-sky objects.\u003c\/p\u003e\n\u003cp\u003eEquipped with an innovative twist-lock mechanism, this diagonal provides a secure, centered hold for your eyepieces and accessories. Simply twist to lock your eyepiece in place – no more fumbling with thumbscrews or misalignments. This mechanism not only protects your equipment but also ensures optimal alignment for the best possible image quality, making it a convenient and reliable addition to your telescope setup.\u003c\/p\u003e\n\u003cp\u003eThe 1.25” format is compatible with standard 1.25” focusers. This twist-lock diagonal is built to last, with an anodized aluminum body that’s as durable as it is lightweight.\u003c\/p\u003e","brand":"David Astro","offers":[{"title":"Default Title","offer_id":49365758574877,"sku":"DAV-DIG-TL-1.25","price":149.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/DAV-DIG-TL-125.jpg?v=1731533606"},{"product_id":"baader-bbhs-prism-adjustable-star-diagonal-2","title":"Baader BBHS Prism Adjustable Star Diagonal - 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eBroad Band Hard Silver (BBHS®) Coated Prism\u003c\/li\u003e\n\u003cli\u003e2-inch ClickLock® Self-Centering Eyepiece Clamp\u003c\/li\u003e\n\u003cli\u003eFully User-Collimatable Prism Mount\u003c\/li\u003e\n\u003cli\u003eCNC-Machined Aluminum Housing\u003c\/li\u003e\n\u003cli\u003eIntegrated 2-inch Filter Threads in Nosepiece\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eBaader BBHS Prism Adjustable Star Diagonal - 2\"\u003c\/h2\u003e\n\u003cp\u003eThe Baader BBHS Prism Adjustable Star Diagonal combines a fully collimatable prism with a 2-inch ClickLock clamp, creating a reference-standard optical link for planetary and visual observation. The prism's Broad Band Hard Silver (BBHS®) coating produces higher contrast and more saturated color compared to standard prisms, mounted in a CNC-machined housing for rapid thermal stability and image stability.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eBBHS® Silver Coating: Broad-Spectrum Reflectivity and Enhanced Contrast\u003c\/h3\u003e\n\u003cp\u003eUnlike diagonals with simpler prism or dielectric coatings, this Baader diagonal uses a Broad Band Hard Silver (BBHS®) coating. This proprietary, multi-layer silver coating is sealed against corrosion and provides exceptionally high reflectivity across a very wide spectral range. The result is a noticeable increase in image brightness, contrast, and color saturation, particularly when observing planets at high magnification through apochromatic refractors.\u003c\/p\u003e\n\u003cp\u003eThe BBHS® process produces no stray light, contributing to a darker background sky and enhanced contrast. In addition to the sealed silver rear surface, the prism also features Baader's Phantom Coating® Group anti-reflection treatment on its optical surfaces to maximize light transmission.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e2-inch ClickLock® Clamp: Secure, Self-Centering Eyepiece Grip\u003c\/h3\u003e\n\u003cp\u003eThe integrated 2-inch ClickLock eyepiece clamp secures even the heaviest accessories with a gentle twist of the outer ring. This mechanism uses leverage to apply strong, even pressure from three sides, similar to a machinist's chuck. This three-point grip prevents any tilting and automatically centers the eyepiece barrel perfectly on the optical axis every time.\u003c\/p\u003e\n\u003cp\u003eThis system eliminates the risk of marring your eyepiece barrels with thumbscrews and provides absolute security for heavy eyepieces, binoviewers, or imaging cameras. The modular design also allows for a 2-inch filter to be threaded into the nosepiece for permanent installation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eCollimatable Prism Mount for Perfect Optical Alignment\u003c\/h3\u003e\n\u003cp\u003eFor the most demanding applications, the prism itself is mounted on an adjustable cradle within the CNC-machined aluminum housing. While the diagonal is precisely aligned at the factory, this feature allows an advanced user to make micro-adjustments to achieve perfect collimation with their telescope's optical axis. This is especially valuable for correcting tilt in an imaging train or for building custom binocular telescopes.\u003c\/p\u003e\n\u003cp\u003eThe factory alignment ensures the optical and mechanical axes are perfectly matched. Adjusting the collimation should only be done after eliminating all other potential sources of error, such as focuser tilt. Please note that user adjustment of the collimation voids the warranty on the factory alignment, though all other warranty coverage remains.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eBBHS® Prism vs. Dielectric Mirror: When to Choose This Diagonal\u003c\/h3\u003e\n\u003cp\u003eChoosing between a prism and a mirror diagonal depends on your telescope's focal ratio. Prisms, like this BBHS® model, are generally recommended for telescopes with slower focal ratios (typically f\/7 and longer). In these systems, a high-quality prism can deliver superior contrast and color fidelity for planetary and lunar observing compared to a mirror.\u003c\/p\u003e\n\u003cp\u003eFor faster optical systems (f\/6 and below), a dielectric mirror diagonal is often preferred to maintain image sharpness. The BBHS® silver prism, however, offers a wider reflective bandwidth than most dielectric mirrors, maintaining high reflectivity into the near-infrared, which can be an advantage for specific imaging applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat makes the Baader BBHS® prism diagonal different from a standard prism diagonal?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eBaader BBHS® Prism Diagonal\u003c\/strong\u003e uses a proprietary Broad Band Hard Silver (BBHS®) coating that is sealed for longevity. This provides higher reflectivity across a wider spectrum of light compared to simpler prisms, resulting in visibly brighter images, enhanced contrast, and richer color saturation, especially on planets.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhen should I choose the Baader BBHS® Prism Diagonal over a dielectric mirror diagonal?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA prism diagonal like the \u003cstrong\u003eBaader BBHS®\u003c\/strong\u003e is generally the superior choice for telescopes with slower focal ratios (f\/7 or longer), such as Schmidt-Cassegrains, Maksutov-Cassegrains, and many refractors. In these instruments, it often provides better contrast and color fidelity than a mirror. For faster telescopes (f\/6 or less), a high-quality mirror diagonal is typically recommended.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 2-inch ClickLock clamp on the Baader BBHS® diagonal work?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe ClickLock clamp uses a simple, gentle twist of the rubberized ring to operate. Internally, this action engages a three-point clamping system that grips the eyepiece barrel firmly and evenly. This design \u003cstrong\u003eprevents tilting\u003c\/strong\u003e, \u003cstrong\u003eautomatically centers the accessory\u003c\/strong\u003e on the optical axis, and \u003cstrong\u003eavoids marring barrels\u003c\/strong\u003e with thumbscrews.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I collimate the Baader BBHS® Prism Diagonal myself?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the prism is mounted in an adjustable cradle, allowing for fine collimation. This is an advanced feature for users looking to eliminate every source of tilt in their optical train. However, the diagonal is precision-aligned at the factory. Please be aware that \u003cstrong\u003euser adjustment of the collimation will void the factory warranty on that alignment\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the Baader BBHS® Prism Diagonal improve views of Jupiter through my 8\" f\/10 SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAn 8\" f\/10 SCT is an ideal instrument for the \u003cstrong\u003eBaader BBHS® Prism Diagonal\u003c\/strong\u003e. You can expect to see a distinct improvement in the color saturation of Jupiter's cloud bands—the Great Red Spot (GRS) and tan belts will appear richer. The complete absence of stray light from the BBHS® coating also enhances contrast, making fine details and smaller storms easier to resolve.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use 2\" filters with the Baader BBHS® Prism Diagonal on my refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The 2-inch nosepiece of the \u003cstrong\u003eBaader BBHS® Prism Diagonal\u003c\/strong\u003e is threaded to accept standard 2-inch astronomy filters. This allows you to install a filter, such as a nebula or light pollution filter, directly into the diagonal for visual observing or imaging sessions with your refractor.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet weight (kg)\u003c\/td\u003e\n\u003ctd\u003e0.63\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDeflection angle\u003c\/td\u003e\n\u003ctd\u003e90°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAR-Coating\u003c\/td\u003e\n\u003ctd\u003ePhantom Coating® Group\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClamping System\u003c\/td\u003e\n\u003ctd\u003eClickLock\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Diameter \/ Clear Aperture (mm)\u003c\/td\u003e\n\u003ctd\u003e47\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical length (mm)\u003c\/td\u003e\n\u003ctd\u003e100\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Connection (eyepiece\/-camera-sided)\u003c\/td\u003e\n\u003ctd\u003eø 2\" (50.8mm), M55\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Connection (lens sided)\u003c\/td\u003e\n\u003ctd\u003eM48, 2\"\/SCT Thread (50.8mm), M55\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Connection (lens sided)\u003c\/td\u003e\n\u003ctd\u003eø 2\" (50.8mm), S58\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eStar Diagonal Prism\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Orientation\u003c\/td\u003e\n\u003ctd\u003eErect image, Mirror inverted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReflection surface\u003c\/td\u003e\n\u003ctd\u003eSealed BBHS coating\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGlas path\u003c\/td\u003e\n\u003ctd\u003e50 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader_Planetarium_Star_Diagonals_T-2_and_2in_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBaader Planetarium Star Diagonals T-2 and 2in Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/baader-planetarium-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eBaader Planetarium Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Baader Planetarium","offers":[{"title":"Default Title","offer_id":51031642669341,"sku":"BAA-2456118","price":706.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Baader-BBHS-Prism-Diagonal-2456118-1.jpg?v=1773260997"},{"product_id":"tele-vue-90-degree-enhanced-aluminum-diagonal-1-25-inch","title":"Tele Vue 90º Enhanced Aluminum Diagonal - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eDiagonal Type: 90° Mirror (Star)\u003c\/li\u003e\n\u003cli\u003eBarrel Size: 1.25\"\u003c\/li\u003e\n\u003cli\u003eReflectivity: 96%\u003c\/li\u003e\n\u003cli\u003eEyepiece Holder: Brass Clamp Ring\u003c\/li\u003e\n\u003cli\u003eFilter Threads: Yes (1.25\")\u003c\/li\u003e\n\u003cli\u003eWeight: 5 oz (142 g)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eA Foundation of Clarity: The Tele Vue 90º Enhanced Aluminum Diagonal\u003c\/h2\u003e\n\u003cp\u003eThe Tele Vue 90º Enhanced Aluminum Diagonal - 1.25\" is a foundational optical component designed to deliver bright, sharp, and color-neutral images from your refractor or Schmidt-Cassegrain telescope. It serves as the critical link between your telescope and eyepiece, providing a comfortable viewing angle without degrading the light path. For the observer who values accuracy and reliability, this diagonal is built to be a workhorse that consistently performs.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eEnhanced Aluminum Mirror Coatings for Bright Views\u003c\/h3\u003e\n\u003cp\u003eAt the heart of this diagonal is a mirror with Tele Vue's enhanced aluminum coatings. This multi-layer coating system achieves 96% reflectivity across the visual spectrum, ensuring that the maximum amount of light from your telescope reaches your eye. The direct visual benefit is a brighter image, which is especially important when observing faint deep-sky objects or fine planetary detail at high magnification.\u003c\/p\u003e\n\u003cp\u003eUnlike some mirror coatings that can introduce a slight color cast, Tele Vue's enhanced aluminum is formulated for color neutrality. This means the double stars, planetary bands, and subtle nebular hues you see are true to life. It renders a clean, honest image, allowing the optical quality of your telescope and eyepiece to define the view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eRobust and Precise Diagonal Housing\u003c\/h3\u003e\n\u003cp\u003eThe diagonal's body is machined from solid aluminum to maintain precise alignment of the internal mirror. This rigidity prevents flexure, which can lead to image shift or astigmatism, especially when using heavier eyepieces or barlows. The 90-degree angle provides a comfortable viewing position for any object more than a few degrees above the horizon, reducing neck strain during long observing sessions.\u003c\/p\u003e\n\u003cp\u003eThis diagonal is not a dielectric, which represents a specific design trade-off. While dielectrics offer slightly higher reflectivity and surface durability, this enhanced aluminum model provides its high performance at a more accessible price point and lighter weight. For visual use, the 2-3% difference in light transmission is often imperceptible, making this a practical choice for many observers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eSecure, Non-Marring Eyepiece Clamp\u003c\/h3\u003e\n\u003cp\u003eTele Vue has engineered this diagonal with a non-marring brass clamp ring to hold your 1.25\" eyepieces. Unlike simple set screws that can scratch and dent your eyepiece barrels, this mechanism provides a uniform grip around the circumference of the barrel. The result is a more secure connection that preserves the finish of your valuable eyepieces and ensures perfect alignment with the optical axis every time.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eContrast-Boosting Internal Baffling\u003c\/h3\u003e\n\u003cp\u003eTo maximize image contrast, the interior of the diagonal is fully blackened and threaded with anti-reflection baffles. These features are designed to trap any stray light that enters the diagonal, preventing it from reflecting off internal surfaces and washing out the image. This attention to detail becomes apparent when observing bright objects like the Moon or Jupiter, where it helps preserve fine, low-contrast details against a dark background.\u003c\/p\u003e\n\u003cp\u003eImagine using this diagonal with a quality 80mm refractor to view the cloud belts of Jupiter. The 96% reflectivity ensures the planet and its moons appear bright and crisp. As you push the magnification, the internal baffling keeps the background space black, making it easier to spot the subtle festoons and barges within the Jovian atmosphere that a less-optimized diagonal might obscure.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eChoosing Your Tele Vue Diagonal\u003c\/h3\u003e\n\u003cp\u003eTele Vue offers several 1.25\" diagonals, and the choice depends on your priorities. The 90º Enhanced Aluminum model is the standard for high-quality visual observing where brightness and color fidelity are key.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003evs. Tele Vue Everbrite Dielectric Diagonal (DPC-1250):\u003c\/strong\u003e The Everbrite diagonal offers 99% reflectivity and a more durable, easier-to-clean mirror coating. It is the choice for observers who want the absolute maximum light transmission and longevity. However, the Enhanced Aluminum diagonal provides nearly identical visual performance for a lower investment, making it an excellent value.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003evs. Tele Vue 60º Everbrite Diagonal (DPC-6012):\u003c\/strong\u003e The 60º diagonal is designed for specific applications where the telescope is mounted very low, such as on a Tele-Pod mount for seated observing. For general use on most equatorial or alt-az mounts, the 90º orientation of the Enhanced Aluminum model is more comfortable.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs a mirror diagonal better than a prism diagonal?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor refractors slower than f\/7 and for all Schmidt-Cassegrains, a high-quality mirror diagonal like this one is generally preferred as it introduces no chromatic aberration. Prism diagonals can sometimes introduce a small amount of color error in fast refractors.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow is this \"Enhanced Aluminum\" diagonal different from a standard aluminum one?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eStandard aluminum coatings typically have around 88% reflectivity. Tele Vue's enhanced aluminum uses a multi-layer dielectric overcoat that boosts reflectivity to 96%, resulting in noticeably brighter images.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this diagonal work with my Schmidt-Cassegrain telescope (SCT)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this diagonal is an excellent upgrade for the stock diagonals included with many SCTs. You will need a standard SCT-to-1.25\" visual back to attach it to the rear cell of your telescope.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy choose this over the Tele Vue Everbrite dielectric model?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Enhanced Aluminum diagonal offers superb optical performance that is visually very close to the Everbrite for a lower cost. It's a high-value option for observers who want Tele Vue quality without needing the absolute highest reflectivity or coating durability of a dielectric.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I clean the mirror on my diagonal?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eMirror diagonal coatings are delicate. Only clean the mirror when necessary using a gentle puffer bulb to remove dust. If further cleaning is needed, use a dedicated optical cleaning solution and microfiber cloths with a careful, no-pressure technique.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eDSC-0125\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003e90-degree Mirror Diagonal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMirror Coating\u003c\/td\u003e\n\u003ctd\u003eEnhanced Aluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReflectivity\u003c\/td\u003e\n\u003ctd\u003e96%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEyepiece Holder\u003c\/td\u003e\n\u003ctd\u003eNon-marring brass clamp ring\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Threads\u003c\/td\u003e\n\u003ctd\u003eStandard 1.25\" (M28.5 x 0.6)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e5 oz (142 g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cimg class=\"DAV-img-box\" alt=\"Tele Vue 90º Enhanced Aluminum Diagonal\" src=\"\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eTele Vue 90º Enhanced Aluminum Diagonal - 1.25\"\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cimg class=\"DAV-img-box\" alt=\"Tele Vue 1.25-inch Dust Cap (top)\" src=\"\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDust Cap\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cimg class=\"DAV-img-box\" alt=\"Tele Vue 1.25-inch Dust Cap (bottom)\" src=\"\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBarrel Dust Cap\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Tele_Vue_Diagonal_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/tele-vue-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eTele Vue 5-Year Limited Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"TeleVue","offers":[{"title":"Default Title","offer_id":51223880597789,"sku":"TV-DSC-0125","price":302.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Tele_Vue_90deg_Enhanced_Aluminum_Diagonal_1.25in_1.jpg?v=1777747262"},{"product_id":"tele-vue-90-degree-everbrite-diagonal-1-25-inch","title":"Tele Vue 90º Everbrite Diagonal - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eReflectivity: 99% Dielectric Coating\u003c\/li\u003e\n\u003cli\u003eSubstrate Material: Pyrex\u003c\/li\u003e\n\u003cli\u003eBarrel Size: 1.25\"\u003c\/li\u003e\n\u003cli\u003eOptical Angle: 90°\u003c\/li\u003e\n\u003cli\u003eEyepiece Holder: Non-marring Brass Clamp Ring\u003c\/li\u003e\n\u003cli\u003eFilter Threads: Yes (1.25\")\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eThe Final Stop for Light: The Tele Vue 90º Everbrite Diagonal\u003c\/h2\u003e\n\u003cp\u003eThe Tele Vue 90º Everbrite Diagonal - 1.25\" is an essential optical component engineered to transmit the maximum amount of light from your telescope to your eyepiece without compromise. For observers who have invested in high-quality optics, this diagonal ensures that the final reflection in the optical path maintains the brightness, contrast, and resolution your telescope is capable of delivering. It is the definitive upgrade over standard aluminum or silver diagonals, offering a quantifiable improvement in image quality and a lifetime of consistent performance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe Everbrite Dielectric Coating Advantage\u003c\/h3\u003e\n\u003cp\u003eAt the heart of the Everbrite is a mirror with a sophisticated dielectric coating. Unlike aluminum coatings that tarnish and lose reflectivity over time, the Everbrite's 50-layer coating provides 99% reflectivity across the visible spectrum and is impervious to aging. This translates directly to a brighter image at the eyepiece, allowing you to detect fainter stars and more subtle details in nebulae and galaxies.\u003c\/p\u003e\n\u003cp\u003eThe coating's durability means you can clean the mirror without fear of scratching or degrading its performance. This ensures your view will be just as bright and crisp in a decade as it is on the first night. The result is a consistent, high-fidelity image that honors the light-gathering power of your telescope.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThermally Stable Pyrex Mirror Substrate\u003c\/h3\u003e\n\u003cp\u003eA mirror's coating is only as good as the surface it is deposited on. Tele Vue uses a low-expansion Pyrex substrate for the Everbrite mirror, which is ground and polished to a 1\/10th wave flatness. The key benefit of Pyrex is its thermal stability; it does not change shape as temperatures drop during an observing session.\u003c\/p\u003e\n\u003cp\u003eThis stability prevents the introduction of optical errors like astigmatism, which can soften fine planetary detail. When you are pushing the magnification on Jupiter's cloud belts or trying to split a tight double star, the Everbrite's thermal integrity ensures the image remains sharp and free of distortion caused by cooling optics.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA Foundation of Mechanical Precision\u003c\/h3\u003e\n\u003cp\u003eThe Everbrite's body is machined from a single, solid block of aluminum. This unibody construction guarantees that the mirror is permanently aligned with the eyepiece and telescope barrels, eliminating concerns about collimation drift. The rigid structure ensures your eyepieces are held perfectly on-axis, which is critical for maintaining sharpness, especially in faster focal ratio telescopes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eProtecting Your Eyepiece Investment\u003c\/h3\u003e\n\u003cp\u003eStandard diagonals use a simple set screw that digs into the eyepiece barrel, causing scratches and potential alignment issues. The Tele Vue Everbrite diagonal features a non-marring brass clamp ring. When you tighten the lock screw, this soft metal ring gently and evenly compresses around the eyepiece barrel, securing it firmly without leaving a mark and ensuring perfect centering in the optical path.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eMaximizing Contrast with Stray Light Control\u003c\/h3\u003e\n\u003cp\u003eImage contrast is just as important as brightness. The interior of the Everbrite diagonal is machined with fine anti-reflection threads and blackened to a matte finish. This design traps any stray light that enters the diagonal, preventing it from reflecting off internal surfaces and washing out the image. The practical effect is a darker background sky, which makes faint objects stand out more clearly against the blackness of space.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eDesigned for Secure, Real-World Use\u003c\/h3\u003e\n\u003cp\u003eThe 1.25\" barrel that inserts into your telescope's focuser is tapered with a safety groove. This small but critical feature prevents the diagonal from accidentally slipping out of the focuser if the lock screw becomes loose. The barrel is also threaded to accept standard 1.25\" filters, allowing you to easily add a moon filter or nebula filter to your observing chain without having to attach it to every individual eyepiece.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe Everbrite in Practice: Observing the Orion Nebula\u003c\/h3\u003e\n\u003cp\u003eThe benefit of 99% reflectivity becomes immediately apparent on a target like the Trapezium region within the Orion Nebula (M42). With a standard aluminum diagonal, the faint, wispy outer loops of the nebula can be lost in the noise. Through the Everbrite, these structures appear with more definition. The four primary stars of the Trapezium are rendered as sharp, distinct points of light, and with good seeing, the fainter E and F stars become more accessible due to the improved brightness and contrast.\u003c\/p\u003e\n\u003cp\u003eWhile a premium diagonal cannot increase your telescope's aperture, it ensures that every photon collected by your main optic reaches your eye. This is the Everbrite's primary function: to be a transparent link in the optical chain. Its limitation is simply that it cannot correct for poor seeing or a poorly collimated telescope, but it will reveal the true performance ceiling of your instrument.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Everbrite diagonal worth the cost over a standard diagonal?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIf you use premium eyepieces and observe faint deep-sky objects or fine planetary detail, yes. The 99% dielectric coating provides a noticeably brighter and higher-contrast image compared to standard aluminum diagonals, which typically offer 88-92% reflectivity and degrade over time.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this diagonal work with my Schmidt-Cassegrain telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the Tele Vue 90º Everbrite Diagonal will work perfectly with any telescope that has a standard 1.25\" visual back or focuser, including Schmidt-Cassegrains, refractors, and Maksutov-Cassegrains.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat's the difference between a mirror diagonal and a prism diagonal?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eMirror diagonals, like the Everbrite, tend to have higher light transmission and introduce no chromatic aberration, making them ideal for all-around and high-magnification use. Prism diagonals can sometimes offer slightly better contrast but may introduce a small amount of color error in very fast (sub f\/5) telescopes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I clean the mirror on the Everbrite diagonal?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe dielectric coating is very durable. Use a bulb blower to remove loose dust first. For fingerprints or residue, use a high-quality optical cleaning fluid and microfiber cloth, applying gentle, circular motions. The coating is as tough as the glass itself.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the Everbrite diagonal correct an upside-down image?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, it provides a right-side-up but mirror-reversed (left-to-right) image, which is standard for astronomical diagonals. For a fully corrected image for terrestrial viewing, you would need an erecting prism diagonal.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eDPC-1250\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eMirror Star Diagonal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMirror Substrate\u003c\/td\u003e\n\u003ctd\u003ePyrex\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMirror Flatness\u003c\/td\u003e\n\u003ctd\u003e1\/10 wave\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoating\u003c\/td\u003e\n\u003ctd\u003eEverbrite Dielectric (99% reflectivity)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEyepiece Holder\u003c\/td\u003e\n\u003ctd\u003eBrass Clamp Ring\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Material\u003c\/td\u003e\n\u003ctd\u003eMachined Aluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Compatibility\u003c\/td\u003e\n\u003ctd\u003eAccepts 1.25\" filters\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e7.2 oz (204 g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eTele Vue 90º Everbrite 1.25\" Diagonal\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDust Cap\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBarrel Dust Cap\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Tele_Vue_Diagonal_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/tele-vue-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eTele Vue 5-Year Limited Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"TeleVue","offers":[{"title":"Default Title","offer_id":51223880663325,"sku":"TV-DPC-1250","price":455.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Tele_Vue_90deg_Everbrite_Diagonal_1.25in_1.jpg?v=1777515019"},{"product_id":"tele-vue-60-degree-everbrite-diagonal-1-25-inch","title":"Tele Vue 60º Everbrite Diagonal - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eReflectivity: 99% Everbrite Dielectric Coatings\u003c\/li\u003e\n\u003cli\u003eViewing Angle: 60°\u003c\/li\u003e\n\u003cli\u003eBarrel Size: 1.25\"\u003c\/li\u003e\n\u003cli\u003eConstruction: Machined Aluminum Housing\u003c\/li\u003e\n\u003cli\u003eEyepiece Holder: Non-Marring Brass Clamp Ring\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eA More Comfortable Angle for Refractor Observing\u003c\/h2\u003e\n\u003cp\u003eThe Tele Vue 60° Everbrite Diagonal is a specialized 1.25\" star diagonal engineered for observers who find the standard 90° angle awkward, particularly when using refractors on alt-azimuth mounts. By combining a more natural viewing posture with benchmark-setting 99% dielectric coatings, this diagonal delivers both ergonomic comfort and maximum light throughput. It is a direct solution for specific observational challenges where comfort translates directly into seeing more detail.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe Everbrite Dielectric Mirror Advantage\u003c\/h3\u003e\n\u003cp\u003eAt the heart of this diagonal is Tele Vue's Everbrite dielectric mirror. This is not a standard aluminum coating. It is an exotic, 10-layer coating system that achieves a certified 99% reflectivity across the entire visual spectrum. The practical effect is a visibly brighter image with more accurate color rendition compared to conventional diagonals, which typically offer 88-95% reflectivity. Faint nebula details and subtle planetary hues are transmitted to your eyepiece with minimal loss.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eWhy a 60° Diagonal Viewing Angle?\u003c\/h3\u003e\n\u003cp\u003eWhile a 90° diagonal is standard, it can create an uncomfortable viewing position when observing objects near the zenith with a refractor on an alt-azimuth mount, forcing you to crouch or kneel. The 60° angle of the Tele Vue Everbrite provides a more direct, head-on viewing posture in these situations. This ergonomic improvement reduces neck strain during long sessions, allowing you to concentrate on the object rather than your own discomfort. This is the diagonal you reach for when your Dobsonian-mounted friends are observing in comfort, and you want to do the same with your refractor.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003ePrecision Machined Housing for Permanent Alignment\u003c\/h3\u003e\n\u003cp\u003eThe diagonal's body is machined from a solid block of aluminum, ensuring the mirror is permanently fixed in perfect alignment. This robust construction means you can trust the collimation is held securely, night after night, without the risk of shifts that can soften images in less durable designs. The one-piece body provides a rigid, dependable foundation for the high-performance optics it contains.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eStray Light Control for Higher Contrast\u003c\/h3\u003e\n\u003cp\u003eImage contrast is just as important as brightness. Tele Vue machines anti-reflection threads and internal baffles into the diagonal's interior surfaces. These features are designed to trap and absorb any off-axis stray light that enters the barrel. This prevents unfocused light from reaching the eyepiece, resulting in a darker background sky and making faint objects stand out more clearly against the blackness of space.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eSecure, Non-Marring Brass Clamp Ring\u003c\/h3\u003e\n\u003cp\u003eTo protect your investment in high-quality eyepieces, the diagonal uses a brass clamp ring instead of a simple setscrew. When you tighten the lock screw, the soft brass ring compresses gently and evenly around your eyepiece barrel. This provides a secure, centered grip that will not scratch or gouge the barrel, preserving the finish and value of your eyepiece collection.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA Trade-Off for Specific Applications\u003c\/h3\u003e\n\u003cp\u003eThe primary limitation of a 60° diagonal is its specialization. For observers using German equatorial mounts or for viewing objects at lower altitudes, the traditional 90° angle often remains more comfortable. The 60° design is not a universal replacement but a targeted upgrade for a specific use case: making zenith-observing with a refractor on an alt-az mount a more pleasant and sustainable experience. When pointed at Jupiter riding high overhead with a Tele Vue DeLite eyepiece, the difference is immediate; your posture is relaxed, your eye is steady, and you can hold the image for longer, allowing the subtle banding in the planet's atmosphere to resolve from the seeing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhen is a 60° diagonal better than a 90° diagonal?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA 60° diagonal is most beneficial when using a refractor on an alt-azimuth mount to view objects high in the sky, near the zenith. It provides a more comfortable, straight-on viewing angle that reduces neck strain compared to the steeper angle of a 90° diagonal in that specific orientation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Tele Vue Everbrite diagonal work with my SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this 1.25\" diagonal will work with any Schmidt-Cassegrain Telescope that has a 1.25\" visual back. However, the ergonomic benefits of the 60° angle are less pronounced on an SCT, where the eyepiece position is already higher and more accessible.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs a dielectric diagonal really better than an aluminum one?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The Everbrite's 99% dielectric coating is more reflective, more durable, and has a flatter spectral response than enhanced aluminum coatings, which typically reflect 95-97%. This translates to slightly brighter images and more accurate color, and the coating will not degrade over time from exposure.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes this diagonal have filter threads?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the 1.25\" barrel is threaded to accept standard 1.25\" astronomy filters, allowing you to easily add a moon filter, light pollution filter, or color filters to your observing setup.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 60° Everbrite compare to the 90° Everbrite?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eOptically, they are identical, both featuring the same 99% reflective Everbrite coatings and build quality. The only difference is the viewing angle. Choose the 90° for general use, especially on equatorial mounts, and the 60° specifically to improve comfort with refractors on alt-az mounts.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eDPC-6012\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eMirror Diagonal (Star Diagonal)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eViewing Angle\u003c\/td\u003e\n\u003ctd\u003e60°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eEverbrite 99% Dielectric\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEyepiece Holder\u003c\/td\u003e\n\u003ctd\u003eBrass Clamp Ring\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Threads\u003c\/td\u003e\n\u003ctd\u003eYes (Standard 1.25\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Material\u003c\/td\u003e\n\u003ctd\u003eMachined Aluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e7.2 oz (204 g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eTele Vue 60º Everbrite Diagonal - 1.25\"\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e1.25\" Dust Cap (Top)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e1.25\" Dust Cap (Bottom)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Tele_Vue_Diagonal_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/tele-vue-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eTele Vue 5-Year Limited Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"TeleVue","offers":[{"title":"Default Title","offer_id":51223880728861,"sku":"TV-DPC-6012","price":517.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Tele_Vue_60deg_Everbrite_Diagonal_1.25in_1.jpg?v=1777515019"},{"product_id":"tele-vue-90-degree-everbrite-diagonal-2-inch","title":"Tele Vue 90º Everbrite Diagonal - 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eReflectivity: 99% Dielectric Coatings\u003c\/li\u003e\n\u003cli\u003eMirror Substrate: Pyrex\u003c\/li\u003e\n\u003cli\u003eBody Construction: CNC-Machined Aluminum\u003c\/li\u003e\n\u003cli\u003eEyepiece Holder: Non-Marring Brass Clamp Ring\u003c\/li\u003e\n\u003cli\u003eBarrel Size: 2-inch with 1.25-inch adapter\u003c\/li\u003e\n\u003cli\u003eFilter Threads: Yes (48mm)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eThe Last Diagonal You'll Ever Need: The Tele Vue 90º Everbrite Diagonal\u003c\/h2\u003e\n\u003cp\u003eThe Tele Vue 90º Everbrite Diagonal is an essential optical component engineered to transmit the maximum amount of light from your telescope to your eyepiece without degrading the image. For observers who refuse to compromise on brightness, contrast, or mechanical integrity, this 2-inch star diagonal serves as a permanent, reference-grade link in the optical chain, ensuring the view your telescope produces is exactly the view your eye receives.\u003c\/p\u003e\n\u003cp\u003eUnlike standard aluminum or silver diagonals that can tarnish and lose reflectivity over time, the Everbrite is built for a lifetime of service. It combines a thermally stable Pyrex mirror with a state-of-the-art dielectric coating system, all housed in a solid, single-piece body that guarantees perfect alignment. This isn't just an accessory; it's an investment in the performance of your entire telescope system.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e99% Reflectivity Dielectric Coatings\u003c\/h3\u003e\n\u003cp\u003eThe heart of the Everbrite is its mirror, which features a 50-layer dielectric coating system. This advanced coating provides a certified reflectivity of 99% across the entire visual spectrum. The practical benefit is a visibly brighter image with more vibrant color saturation compared to diagonals using standard aluminum coatings, which typically reflect only 88-92% of light.\u003c\/p\u003e\n\u003cp\u003eThis increase in light throughput is most noticeable on faint deep-sky objects. The wispy outer arms of the Triangulum Galaxy (M33) or the faint mottling within the Orion Nebula (M42) gain a subtle but definite boost in contrast and visibility. The coatings are also exceptionally durable, resisting the gradual oxidation that degrades traditional mirror surfaces over years of use.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe Everbrite Protective Over-Coating\u003c\/h3\u003e\n\u003cp\u003eTo ensure the dielectric layers last a lifetime, Tele Vue applies a proprietary hard over-coating. This Everbrite layer acts as a shield, protecting the delicate underlying coatings from airborne pollutants, moisture, and the physical contact of cleaning. This is the diagonal's key limitation and strength: while it can be cleaned if necessary, the Everbrite process is so robust that the mirror should almost never require it, preserving its optical quality indefinitely.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThermally Stable Pyrex Substrate\u003c\/h3\u003e\n\u003cp\u003eA mirror's coating is only as good as the surface it's on. The Everbrite uses a low-expansion Pyrex substrate, which is far more resistant to temperature changes than the plate glass found in budget diagonals. As your telescope cools to ambient temperature during an observing session, the Pyrex mirror maintains its precise 1\/10-wave optical figure, preventing the introduction of astigmatism or other aberrations that can soften the view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eSolid, Single-Piece CNC-Machined Housing\u003c\/h3\u003e\n\u003cp\u003eMany diagonals are assembled from multiple screwed-together parts, creating potential points of flexure or misalignment. The Everbrite body is machined from a single block of solid aluminum to ensure permanent, perfect alignment between the telescope's optical axis and the eyepiece. This rigid, unyielding structure means that even heavy eyepieces or binoviewers will not cause the diagonal to sag or shift, preserving the sharp collimation of your optical system.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eNon-Marring Brass Clamp Ring\u003c\/h3\u003e\n\u003cp\u003eProtecting your eyepiece investment is critical. Instead of a simple set screw that digs into the barrel, the Everbrite uses a soft brass clamp ring. As you tighten the oversized screw, this internal ring compresses gently and evenly around the eyepiece barrel. This mechanism provides a more secure grip across a wider surface area and completely avoids the scratches and gouges that set screws inflict.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eContrast-Enhancing Baffling\u003c\/h3\u003e\n\u003cp\u003eTo deliver the highest possible contrast, a diagonal must control stray light. The interior of the Everbrite is machined with anti-reflection threads and finished in a flat black. This baffling system traps any off-axis light that enters the diagonal, preventing it from reflecting into the eyepiece. The result is a darker background sky, which makes it easier to perceive faint details, like the delicate Cassini Division in Saturn's rings or the faint stars at the core of globular cluster M13.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eChoosing the Right Tele Vue Diagonal\u003c\/h3\u003e\n\u003cp\u003eTele Vue offers several high-performance diagonals, and the choice depends on your telescope and observing goals. The Everbrite is the definitive choice for refractors and Schmidt-Cassegrains where light-gathering and long-term durability are paramount.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003evs. Tele Vue 1.25\" Everbrite (DPC-1250):\u003c\/strong\u003e The 2-inch Everbrite is the logical upgrade for telescopes with 2-inch focusers. It allows the use of wide-field 2-inch eyepieces and provides a more robust, stable platform. The 1.25-inch model is an excellent choice for smaller telescopes or when weight is a primary concern.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003evs. Tele Vue SCT Diagonal (ACC-0003):\u003c\/strong\u003e While the Everbrite can be used with an SCT, the dedicated SCT diagonal is designed to thread directly onto the rear cell. This creates a shorter, more rigid light path, which can be advantageous for imaging or using heavy accessory trains. However, the standard Everbrite offers more versatility for use with different telescope types.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs a dielectric diagonal better than a prism diagonal?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor most applications, yes. A high-quality dielectric mirror diagonal like the Everbrite offers higher light transmission and better color accuracy than most prisms. Prisms can sometimes offer slightly higher contrast, but they can also introduce chromatic aberration in short focal ratio telescopes (below f\/7).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Tele Vue Everbrite work with my Schmidt-Cassegrain Telescope (SCT)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the 2-inch Everbrite slides into any standard 2-inch visual back or focuser on an SCT. For a more direct, rigid connection, Tele Vue also offers a specific SCT diagonal that threads onto the rear cell, but the Everbrite offers greater versatility across different telescope types.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is the Everbrite more expensive than other dielectric diagonals?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe cost reflects the combination of a 1\/10-wave Pyrex mirror, the durable Everbrite over-coating, and the precision CNC-machined single-piece housing. These elements together ensure thermal stability, perfect alignment, and a lifetime of consistent performance that cheaper, multi-part diagonals cannot guarantee.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need a 2-inch diagonal if I only have 1.25-inch eyepieces?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eEven if you only use 1.25-inch eyepieces now, a 2-inch diagonal is a future-proof investment. It allows you to upgrade to wide-field 2-inch eyepieces later without needing to buy another diagonal. The included 1.25-inch adapter is high quality and maintains perfect centering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow often should I clean the Everbrite mirror?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAlmost never. The Everbrite's protective over-coating is extremely durable and the diagonal should be kept capped when not in use. Cleaning should only be considered after years of use if significant dust has accumulated that cannot be removed with an air bulb.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel #\u003c\/td\u003e\n\u003ctd\u003eDDP-8004\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eMirror Diagonal (Star Diagonal)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAngle\u003c\/td\u003e\n\u003ctd\u003e90-degree\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e2-inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAdapter\u003c\/td\u003e\n\u003ctd\u003e2-inch to 1.25-inch (included)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMirror\u003c\/td\u003e\n\u003ctd\u003e1\/10 wave Pyrex substrate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003e50-layer dielectric with Everbrite over-coat\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReflectivity\u003c\/td\u003e\n\u003ctd\u003e99% across visual spectrum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEyepiece Clamp\u003c\/td\u003e\n\u003ctd\u003eBrass clamp ring (non-marring)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHousing\u003c\/td\u003e\n\u003ctd\u003eOne-piece CNC machined aluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Threads\u003c\/td\u003e\n\u003ctd\u003eYes, for standard 2-inch (48mm) filters\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cimg class=\"DAV-img-box\" alt=\"Tele Vue 90º Everbrite 2-inch Diagonal\" src=\"[Image%20URL]\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eTele Vue 90º Everbrite 2-inch Diagonal\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cimg class=\"DAV-img-box\" alt=\"Tele Vue 2-inch to 1.25-inch Adapter\" src=\"[Image%20URL]\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e2\" to 1.25\" Adapter with Brass Clamp Ring\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cimg class=\"DAV-img-box\" alt=\"Tele Vue 2-inch Dust Cap\" src=\"[Image%20URL]\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e2\" Barrel Dust Cap\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cimg class=\"DAV-img-box\" alt=\"Tele Vue 2-inch Eyepiece Dust Cap\" src=\"[Image%20URL]\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e2\" Eyepiece Port Dust Cap\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Tele_Vue_Diagonal_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/tele-vue-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eTele Vue 5-Year Limited Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"TeleVue","offers":[{"title":"Default Title","offer_id":51223880761629,"sku":"TV-DDP-8004","price":630.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Tele_Vue_90deg_Everbrite_Diagonal_2in_1.jpg?v=1777515019"},{"product_id":"askar-2-diagonal","title":"Askar 2” High-Precision Dielectric Diagonal","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e2-inch Barrel Diameter\u003c\/li\u003e\n\u003cli\u003eHigh-Reflectivity Dielectric Mirror Coating\u003c\/li\u003e\n\u003cli\u003eAccepts both 2\" and 1.25\" Eyepieces\u003c\/li\u003e\n\u003cli\u003eCompatible with SCT and Refractor\/Reflector Telescopes\u003c\/li\u003e\n\u003cli\u003eCNC-Machined Aluminum Body\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eAskar 2” High-Precision Dielectric Diagonal\u003c\/h2\u003e\n\u003cp\u003eThe Askar 2” Dielectric Diagonal is an essential optical upgrade, replacing standard diagonals with a high-precision, CNC-machined unit designed for maximum light transmission and image contrast. Its design provides threaded attachment for Schmidt-Cassegrain telescopes and a 2\" nosepiece for refractors, accepting both 2\" and 1.25\" eyepieces to accommodate your entire collection.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eHigh-Reflectivity Dielectric Mirror for 2-inch Eyepieces\u003c\/h3\u003e\n\u003cp\u003eAt the core of this diagonal is a high-precision flat mirror with a durable dielectric coating. Unlike standard aluminum coatings that can degrade over time, dielectric layers offer stable, high reflectivity across the visual spectrum, ensuring brighter images and more accurate color rendition for any 2-inch or 1.25-inch eyepiece you use.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eCNC-Machined Housing for Precise 2-inch Alignment\u003c\/h3\u003e\n\u003cp\u003eThe diagonal's body is machined from a single piece of aluminum for superior rigidity and alignment of the 2-inch optical path. This integrated design prevents flexure that can misalign optics, while the matte black interior surfaces absorb stray light, preventing reflections from washing out faint detail on celestial targets.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eAdapts to SCTs, 2\" Focusers, and 1.25\" Eyepieces\u003c\/h3\u003e\n\u003cp\u003eThis diagonal is engineered for broad compatibility across different telescope designs. It provides a 2\" nosepiece for use in standard refractor and reflector focusers, as well as threads for direct attachment to the rear cell of an SCT. A step-down adapter allows you to securely use your 1.25\" eyepieces and accessories, making it a single solution for your observing needs.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the benefit of a dielectric diagonal like the Askar 2\" model over a standard one?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA dielectric diagonal provides two main advantages. First, its multi-layer coating delivers higher reflectivity for brighter images compared to standard aluminum. Second, the coating is far more durable and resistant to environmental degradation, ensuring consistent optical light transmission for years of use.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Askar 2\" Diagonal with my 8\" SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The Askar 2\" Diagonal is designed to be fully compatible with Schmidt-Cassegrain telescopes. It includes the necessary threads to attach directly to the rear cell of most commercial SCTs, providing a secure, rigid connection for your 2\" and 1.25\" eyepieces.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Askar 2\" Diagonal improve image contrast?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe interior of the diagonal is finished with a non-reflective matte black coating. This treatment absorbs stray light that enters the optical path, preventing it from scattering and reducing contrast. This results in a darker background sky and makes it easier to see faint details in objects like nebulae and galaxies.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill I be able to see the full field of my 2\" wide-angle eyepieces with this diagonal?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the Askar 2\" Diagonal is built with clear apertures designed to fully illuminate the large field stops of 2\" wide-field eyepieces without vignetting or cutting off the edge of the view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Askar 2\" Diagonal a good choice for planetary viewing of Jupiter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. For planetary observation of targets like Jupiter's cloud bands or Saturn's rings, optical precision is critical. The high-precision flat mirror in the Askar 2\" Diagonal ensures that it does not introduce any optical errors, preserving the sharpness and detail delivered by your telescope's main optics.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I switch between using 1.25\" and 2\" eyepieces with the Askar 2\" Diagonal?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe diagonal features a 2\" eyepiece holder with a non-marring compression ring for your larger eyepieces. To use smaller 1.25\" eyepieces, you simply insert the included 2\"-to-1.25\" adapter into the eyepiece holder and secure it as you would an eyepiece. You can then insert your 1.25\" eyepieces into the adapter.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/askar-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eAskar 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":52851344343325,"sku":"ASK-ASKAR2DIAG","price":245.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Askar-2-Diagonal-1_92b9dae8-53e4-4697-8520-c41e821ff4df.jpg?v=1788401875"},{"product_id":"william-optics-d-dig2d-c-db-sct","title":"William Optics 2\" 90° Dura Bright Dielectric Diagonal for SCT threaded Scope","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eEnables use of 2-inch eyepieces for wide-field views\u003c\/li\u003e\n\u003cli\u003e90° viewing angle for comfortable observing at the zenith\u003c\/li\u003e\n\u003cli\u003eDura-Bright dielectric coatings for superior light transmission and durability\u003c\/li\u003e\n\u003cli\u003eThreads directly to the rear cell of SCT-threaded telescopes\u003c\/li\u003e\n\u003cli\u003eReduces mechanical flexure compared to standard slip-fit diagonals\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section-center\"\u003e\n      \u003ch2\u003e2\" 90° Dura Bright Dielectric Diagonal for SCT threaded Scope\u003c\/h2\u003e\n      \u003cp\u003eThis 2\" 90° Dura Bright Dielectric Diagonal is an essential upgrade for any Schmidt-Cassegrain telescope owner looking to maximize both optical throughput and mechanical stability. By threading directly onto your SCT's rear cell, it creates a solid, flex-free connection ideal for heavy 2-inch eyepieces and imaging equipment. The highly reflective and durable dielectric coatings ensure that the maximum amount of light from your telescope's optics reaches your eye, delivering brighter images and improved contrast on faint deep-sky objects.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eThe Stability of a Direct SCT Thread-On Connection\u003c\/h3\u003e\n      \u003cp\u003eUnlike standard diagonals that require a visual back and use a slip-fit compression ring, this model threads directly onto the rear port of most Schmidt-Cassegrain telescopes. This single, solid connection eliminates a common source of mechanical sag and potential misalignment, which is critical when using heavy, wide-field 2-inch eyepieces or a camera. Your optical train remains perfectly collinear, preserving the sharp focus your SCT is designed to deliver.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eDura-Bright Dielectric Coatings for Maximum Reflectivity\u003c\/h3\u003e\n      \u003cp\u003eThe \"Dura-Bright\" mirror features advanced dielectric coatings, which offer two key advantages over standard aluminum or silver coatings. First, they provide extremely high reflectivity across the visual spectrum, transmitting more light to the eyepiece for visibly brighter images. Second, these multi-layer coatings are far more durable and resistant to environmental degradation, ensuring your diagonal maintains its peak optical clarity for years of use without tarnishing.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n    \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eUnlocking Wide-Field Views with the 2-Inch Format\u003c\/h3\u003e\n      \u003cp\u003eThe primary reason to upgrade to a 2-inch diagonal is to gain access to the widest possible true fields of view your telescope can produce. By accommodating 2-inch eyepieces, this diagonal transforms your SCT into a capable instrument for sweeping the Milky Way and framing large celestial objects like the Andromeda Galaxy (M31) or the North American Nebula (NGC 7000) in a single view.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eSCT Thread-On vs. Slip-Fit Diagonals: Why Rigidity Matters\u003c\/h3\u003e\n      \u003cp\u003eFor an SCT owner, the choice between a thread-on and a slip-fit diagonal comes down to stability. While a slip-fit diagonal offers rotational convenience, it can also introduce tilt or sag, especially under the load of a heavy eyepiece like a Tele Vue Nagler or Ethos.\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eThread-On Advantage:\u003c\/strong\u003e By becoming a rigid extension of the optical tube, a thread-on diagonal like this Dura Bright model maintains perfect alignment. This prevents focus shift and ensures that stars at the edge of the field remain as sharp as your telescope's optics will allow.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eSlip-Fit Limitation:\u003c\/strong\u003e The small amount of play in a slip-fit connection can be enough to slightly degrade image sharpness, an issue that becomes more apparent during high-magnification planetary viewing or astrophotography.\u003c\/li\u003e\n      \u003c\/ul\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n\u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhy should I upgrade to this 2\" Dura Bright SCT Diagonal from my stock 1.25\" diagonal?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eUpgrading to this 2\" diagonal offers three major improvements. You gain access to \u003cstrong\u003ewide-field 2-inch eyepieces\u003c\/strong\u003e, your views will be noticeably \u003cstrong\u003ebrighter due to the dielectric coatings\u003c\/strong\u003e, and the \u003cstrong\u003edirect SCT thread connection provides a more rigid and stable\u003c\/strong\u003e optical path than the standard visual back and slip-fit diagonal combination.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main advantage of a \"dielectric\" diagonal?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eA dielectric diagonal uses dozens of micro-thin layers of optical coatings to achieve extremely high reflectivity. This means more light is sent to your eyepiece, making faint objects easier to see. These coatings are also incredibly durable and resistant to aging, so the mirror will not tarnish or lose reflectivity over time like a standard aluminum mirror can.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWill this 2\" Dura Bright diagonal help me see faint objects like the Veil Nebula (NGC 6960) with my 8\" SCT?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes. The combination of using a 2-inch, low-power eyepiece and the high-reflectivity dielectric coatings is ideal for observing large, faint objects like the Veil Nebula. The wider field of view helps you frame the nebula, and the increased light transmission makes it appear brighter against the background sky, especially when paired with a UHC or O-III filter.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow does this Dura Bright diagonal improve views of open clusters like the Pleiades (M45) in my Celestron 11\" SCT?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eA large SCT like an 11\" has a long focal length, making it difficult to fit large open clusters like the Pleiades into a single field of view with 1.25\" eyepieces. This 2\" diagonal allows you to use long focal length 2\" eyepieces, reducing the magnification and expanding your true field of view to frame the entire cluster beautifully.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the direct-thread connection of this SCT diagonal prevent my eyepiece from rotating?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes, the diagonal body itself is fixed in place once threaded onto the telescope. However, the eyepiece holder on the diagonal typically uses a non-marring compression ring that allows you to rotate the eyepiece to the most comfortable viewing orientation without loosening the diagonal itself.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use this Dura Bright SCT Diagonal on my refractor or Newtonian telescope?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eNo, not directly. This diagonal is designed specifically with SCT threads to attach to the rear cell of a Schmidt-Cassegrain or Maksutov-Cassegrain telescope. It does not have a 2\" nosepiece for use in a standard refractor or Newtonian focuser.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003ctable class=\"DAV-specifications\"\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n\u003ctd\u003eSpecifications\u003c\/td\u003e\n\u003ctd\u003eNo specifications available for this product.\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cul class=\"DAV-grid\"\u003e\n    \u003cli class=\"DAV-grid-item\"\u003e\n      \u003cdiv\u003e\n        \u003cp class=\"DAV-item-title\"\u003eBox Contents\u003c\/p\u003e\n        \u003cp class=\"DAV-item-subtitle\"\u003eBox contents have not been specified by the manufacturer.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/li\u003e\n\n\n\u003cli\u003e\n\u003cp\u003eWarranty information is not available for this product.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":52853691613469,"sku":"WO-D-DIG2D-C-DB-SCT","price":286.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/WilliamOptics-2-90-Dura-Bright-Dielectric-Diagonal-for-SCT-threaded-Scope-1_8816c6a4-d15b-4d84-afc9-ba6a23f3ec08.jpg?v=1788457875"},{"product_id":"william-optics-d-ep90-125-rc61","title":"William Optics 1.25\" 90° Erect Prism for Cat 61 WIFD","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eProvides a fully corrected, erect image for terrestrial viewing\u003c\/li\u003e\n\u003cli\u003eComfortable 90° viewing angle\u003c\/li\u003e\n\u003cli\u003eStandard 1.25\" barrel accepts most astronomical eyepieces\u003c\/li\u003e\n\u003cli\u003eDesigned specifically for the William Optics Cat 61 WIFD telescope\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003e1.25\" 90° Erect Prism for Cat 61 WIFD\u003c\/h2\u003e\n\u003cp\u003eThis 90° erecting prism converts the William Optics Cat 61 WIFD from an astronomical instrument into a high-magnification terrestrial spotting scope. It delivers a fully upright and non-reversed image through its standard 1.25\" barrel, making the Cat 61's apochromatic optics ideal for birdwatching, landscape observation, or any daytime viewing application.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe 90° Angle: Comfortable Daytime Viewing with the Cat 61 WIFD\u003c\/h3\u003e\n\u003cp\u003eWhile straight-through viewing is common in spotting scopes, the 90° angle of this prism provides a more comfortable and ergonomic viewing position, especially when observing targets at a high elevation or for extended periods. This design allows you to use your Cat 61 WIFD on a standard photo tripod without needing to crouch into an awkward position, mirroring the comfort of astronomical observation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e1.25\" Barrel: Universal Fit for Standard Eyepieces\u003c\/h3\u003e\n\u003cp\u003eThe prism features a standard 1.25\" barrel, ensuring compatibility with the vast majority of astronomical eyepieces. This allows you to leverage your existing eyepiece collection to achieve a wide range of magnifications for terrestrial viewing. You can use a low-power eyepiece for wide scenic views and switch to a high-power one to resolve fine details on distant subjects, all while maintaining a correctly oriented image.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eErecting Prism vs. Mirror Diagonal: The Right Tool for the View\u003c\/h3\u003e\n\u003cp\u003eIt's important to select the right diagonal for your purpose. While this erecting prism is the definitive choice for daytime terrestrial use, a traditional mirror star diagonal is generally preferred for critical astronomical observing.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eErecting Prism (This Product):\u003c\/strong\u003e Uses a prism to correct the image both vertically and horizontally. This is essential for terrestrial viewing where an upside-down or mirrored view would be disorienting. The extra glass path can introduce minor chromatic aberration at very high powers on bright astronomical targets.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMirror Star Diagonal:\u003c\/strong\u003e Uses a highly reflective mirror to bend the light path. It corrects the image vertically but leaves it reversed left-to-right. This is perfectly acceptable for astronomy but unsuitable for terrestrial use. Mirror diagonals typically offer slightly higher light transmission and optical purity for faint deep-sky objects.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the 1.25\" 90° Erect Prism do for my Cat 61 WIFD?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt converts your Cat 61 WIFD telescope, which naturally produces an inverted and reversed image, into a terrestrial spotting scope. The prism corrects the image to be \u003cstrong\u003efully upright and correctly oriented left-to-right\u003c\/strong\u003e, making it perfect for daytime activities like birdwatching, nature observation, or surveillance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs this prism better than the standard star diagonal for astronomy with the Cat 61?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, for critical astronomical viewing, a high-quality mirror star diagonal is typically recommended. Erecting prisms involve more complex light paths that can introduce very subtle optical aberrations, which might be noticeable at high magnification on planets or double stars. This prism is specifically optimized for daytime terrestrial use where a correct image is mandatory.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the 1.25\" 90° Erect Prism to watch birds in a nearby park with my Cat 61?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. This is the ideal application for this accessory. Pairing the Cat 61 WIFD's excellent apochromatic optics with this erecting prism will provide sharp, color-correct, and high-magnification views of wildlife, far surpassing what is possible with typical binoculars or small spotting scopes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill I be able to see the Moon correctly oriented with this Cat 61 prism?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. While a mirror diagonal is often preferred for detailed lunar study, this erecting prism will show you the Moon exactly as it appears to the naked eye or on a map (upright and not mirrored). This can be helpful for identifying specific craters and features from a lunar atlas without having to mentally flip the image.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I install the 1.25\" 90° Erect Prism on my Cat 61 WIFD?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eInstallation is simple. You insert the 1.25\" nosepiece of the erecting prism directly into the 1.25\" eyepiece holder or visual back of your Cat 61 WIFD's focuser and secure it with the thumbscrews. Then, you can insert any standard 1.25\" eyepiece into the prism's eyepiece holder.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this 1.25\" Erect Prism work with other telescopes besides the William Optics Cat 61 WIFD?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile designed for the Cat 61 WIFD, this prism should work with most refractor telescopes that use a standard 1.25\" focuser or visual back. However, you must ensure your telescope has enough focuser travel to reach focus, as erecting prisms can sometimes require more \"in-focus\" or \"out-focus\" than standard diagonals.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/davidastro.com\/pages\/william-optics-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":52853691711773,"sku":"WO-D-EP90-125-RC61","price":219.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/WilliamOptics-1-25-90-Erect-Prism-for-Cat-61-WIFD-1_b2794600-6003-4a33-9db5-871534fa1d2d.jpg?v=1788457886"},{"product_id":"svbony-sv188-90-zenith-mirror-diagonal-125in","title":"SVBONY SV188 90° Zenith Mirror Diagonal - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eProvides a comfortable 90-degree viewing angle\u003c\/li\u003e\n\u003cli\u003eStandard 1.25\" barrel fits most refractor and SCT focusers\u003c\/li\u003e\n\u003cli\u003eFeatures a 90% reflectivity mirror for bright images\u003c\/li\u003e\n\u003cli\u003eDurable all-metal housing maintains optical alignment\u003c\/li\u003e\n\u003cli\u003eSingle-screw clamp secures 1.25\" eyepieces\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eSVBONY SV188 Zenith Mirror Diagonal 1.25inch 90 Degree\u003c\/h2\u003e\n\u003cp\u003eThe SVBONY SV188 Zenith Mirror Diagonal redirects the light path of your refractor telescope by 90 degrees, placing the eyepiece in a much more comfortable position for astronomical viewing. Its standard 1.25-inch barrel ensures compatibility with a vast range of telescopes and eyepieces, while the internal mirror's 90% reflectivity preserves the brightness and clarity of the image delivered by your objective lens.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e90% Reflectivity Mirror for Brighter, Clearer Views\u003c\/h3\u003e\n\u003cp\u003eThe core of the SV188 is its mirror, which features a reflective coating that transmits 90% of the incoming light to your eyepiece. This level of reflectivity is crucial for preserving image brightness, especially when observing faint deep-sky objects like the Orion Nebula (M42) or distant galaxies. Unlike some entry-level prisms, a mirror diagonal introduces no chromatic aberration, ensuring that bright objects like Jupiter and Sirius remain free of false color.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eDurable Metal Housing \u0026amp; 1.25\" Refractor Compatibility\u003c\/h3\u003e\n\u003cp\u003eBuilt with a metal housing, the SVBONY SV188 is designed for durability and to hold the mirror in precise alignment, night after night. The 1.25-inch nosepiece and eyepiece holder are standard sizes, ensuring a secure fit in the focusers of most refractors, Schmidt-Cassegrains, and Maksutov-Cassegrains. A single locking screw provides a firm grip on your eyepieces.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRefractor-Specific Design:\u003c\/strong\u003e This diagonal is optimized for telescopes where you view from the back of the tube.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNewtonian Limitation:\u003c\/strong\u003e The SV188 is not suitable for Newtonian reflectors. Its light path is too long, which prevents the telescope from reaching focus.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eSV188 Mirror vs. Prism Diagonal: A 90° Difference\u003c\/h3\u003e\n\u003cp\u003eWhile both mirror and prism diagonals provide a 90-degree viewing angle, they achieve it differently. The SV188's mirror reflects the light, which generally provides better color fidelity and light throughput compared to standard, uncoated prism diagonals. While high-end prisms can offer excellent views, a quality mirror diagonal like the SV188 is often a significant upgrade over the basic prism included with many beginner telescopes, yielding sharper and brighter images.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy should I use the SVBONY SV188 diagonal with my refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary reason is comfort. Without a diagonal, viewing objects high in the sky through a refractor requires you to crouch or kneel in an awkward position. The SV188's \u003cstrong\u003e90-degree\u003c\/strong\u003e angle lets you observe comfortably while seated, leading to steadier views and longer, more enjoyable sessions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the SVBONY SV188 work with my Newtonian telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, the SV188 is \u003cstrong\u003enot suitable for Newtonian reflectors\u003c\/strong\u003e. Newtonian telescopes have a very specific focal plane and require a secondary mirror, not a diagonal, to direct light to the side-mounted focuser. Adding this diagonal would prevent the telescope from achieving focus.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the SV188 diagonal affect views of the Moon in my 80mm refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe SV188 will provide bright, sharp views of the Moon. Its \u003cstrong\u003e90% reflectivity\u003c\/strong\u003e ensures minimal light loss, keeping lunar features like crater walls and rilles high in contrast. Because it's a mirror diagonal, it won't introduce any chromatic aberration (color fringing), preserving the true color and fine detail along the terminator.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the SVBONY SV188 provide a \"correct\" image for terrestrial viewing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. Like all standard astronomical mirror diagonals, the SV188 provides an image that is correct up-and-down but is reversed left-to-right. This is perfectly acceptable for astronomy, but for terrestrial viewing (like bird watching), you would need a 45-degree correct-image erecting prism.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the SVBONY SV188 on a Maksutov-Cassegrain like a Celestron NexStar 4SE?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, absolutely. Maksutov-Cassegrain and Schmidt-Cassegrain telescopes function like refractors in that they have a rear-mounted focuser. The SV188 is perfectly compatible and is a common accessory for these types of telescopes to achieve a more comfortable viewing position.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the advantage of the SV188 mirror diagonal over a basic prism diagonal?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe SV188's main advantages are typically better light transmission and color fidelity. Its \u003cstrong\u003e90% reflectivity\u003c\/strong\u003e mirror surface avoids the potential light absorption and scattering of a lower-quality prism and does not introduce the slight chromatic aberration that can occur as light passes through the glass of a prism.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eEyepiece Connection\u003c\/td\u003e\n\u003ctd\u003e1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTelescope Connection\u003c\/td\u003e\n\u003ctd\u003e1.25\" (or 2\" with optional adapter)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEyepiece Clamp\u003c\/td\u003e\n\u003ctd\u003eSingle screw\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReflectivity\u003c\/td\u003e\n\u003ctd\u003e90%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHousing Material\u003c\/td\u003e\n\u003ctd\u003eMetal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible Telescope Types\u003c\/td\u003e\n\u003ctd\u003eRefractors, Schmidt-Cassegrains, Maksutov-Cassegrains\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncompatible Telescope Types\u003c\/td\u003e\n\u003ctd\u003eNewtonian Reflectors\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eSV188 1.25\" Zenith Mirror Diagonal\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDust Cap (Eyepiece Side)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDust Cap (Telescope Side)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/svbony-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eSVBONY 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SVBONY","offers":[{"title":"Default Title","offer_id":52861237461277,"sku":"SV-F9171A","price":34.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-SV188-Zenith-Mirror-Diagonal-1-25inch-90-Degree-For-Refractors-1_e283a9c2-ef17-4efb-bee3-fc97ff1c0caf.jpg?v=1788883436"},{"product_id":"svbony-sv188p-90-dielectric-mirror-diagonal-2in","title":"SVBONY SV188P 90° Dielectric Mirror Diagonal - 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n  \u003cli\u003e99% Reflectivity Dielectric Coatings\u003c\/li\u003e\n  \u003cli\u003e90-Degree Viewing Angle\u003c\/li\u003e\n  \u003cli\u003e11mm Thick Mirror Substrate\u003c\/li\u003e\n  \u003cli\u003eDurable Aluminum Alloy Body\u003c\/li\u003e\n  \u003cli\u003eBrass Compression Ring Eyepiece Holder\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n  \u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n  \u003cli\u003eFAQ\u003c\/li\u003e\n  \u003cli\u003eSpecifications\u003c\/li\u003e\n  \u003cli\u003eIn the Box\u003c\/li\u003e\n  \u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n  \u003cli class=\"active\"\u003e\n    \u003cdiv\u003e\n      \u003cdiv class=\"DAV-bg-light\"\u003e\n        \u003cdiv class=\"DAV-section-center\"\u003e\n          \u003ch2\u003eSVBONY SV188P 99% Reflectivity 90-Degree Dielectric Mirror Diagonal\u003c\/h2\u003e\n          \u003cp\u003eThe SVBONY SV188P 90-Degree Dielectric Mirror Diagonal maximizes image brightness by delivering 99% reflectivity from its precision 11mm thick mirror. This design ensures that the absolute minimum amount of light is lost in the optical path, providing brighter, higher-contrast views through refractors and Cassegrain telescopes.\u003c\/p\u003e\n        \u003c\/div\u003e\n      \u003c\/div\u003e\n      \u003cdiv class=\"DAV-bg-light\"\u003e\n        \u003cdiv class=\"DAV-section\"\u003e\n          \u003ch3\u003e99% Dielectric Mirror: Maximizing Light Throughput\u003c\/h3\u003e\n          \u003cp\u003eAt the core of the SV188P is a mirror with advanced dielectric coatings that achieve 99% reflectivity. Unlike standard aluminum or silver coatings that can degrade over time, these multi-layer coatings are highly durable and deliver consistent light transmission across the visible spectrum. The mirror itself is 11mm thick, providing excellent thermal stability to maintain a precise figure during temperature changes.\u003c\/p\u003e\n          \u003cul\u003e\n            \u003cli\u003e\n\u003cstrong\u003e99% Reflectivity:\u003c\/strong\u003e Transmits nearly all collected light to your eyepiece, resulting in visibly brighter images compared to diagonals with lower-grade coatings.\u003c\/li\u003e\n            \u003cli\u003e\n\u003cstrong\u003eDielectric Coatings:\u003c\/strong\u003e Offer superior durability and resistance to aging, ensuring the diagonal maintains its peak optical clarity for years of use.\u003c\/li\u003e\n            \u003cli\u003e\n\u003cstrong\u003e11mm Thick Mirror:\u003c\/strong\u003e Provides a stable optical surface that resists warping from temperature fluctuations, preserving image sharpness.\u003c\/li\u003e\n          \u003c\/ul\u003e\n        \u003c\/div\u003e\n      \u003c\/div\u003e\n      \u003cdiv class=\"DAV-bg-light\"\u003e\n        \u003cdiv class=\"DAV-section\"\u003e\n          \u003ch3\u003e90-Degree Ergonomics and Eyepiece Protection\u003c\/h3\u003e\n          \u003cp\u003eDesigned for comfortable observing, the 90-degree angle of the SV188P places the eyepiece in a natural position for viewing objects high in the sky, reducing neck strain during long sessions. The robust aluminum alloy body houses a non-marring brass compression ring, which secures your eyepieces firmly without scratching their barrels—a significant upgrade over simple set screw designs.\u003c\/p\u003e\n          \u003cul\u003e\n            \u003cli\u003e\n\u003cstrong\u003eComfortable Viewing Angle:\u003c\/strong\u003e The 90-degree bend is ideal for use with refractor and Cassegrain-style telescopes where the eyepiece would otherwise be at an awkward angle.\u003c\/li\u003e\n            \u003cli\u003e\n\u003cstrong\u003eBrass Compression Ring:\u003c\/strong\u003e Grips the eyepiece barrel uniformly, preventing scratches and ensuring a secure, centered fit.\u003c\/li\u003e\n            \u003cli\u003e\n\u003cstrong\u003eAluminum Alloy Construction:\u003c\/strong\u003e Provides a rigid, durable frame for the optical components, ensuring reliable alignment.\u003c\/li\u003e\n          \u003c\/ul\u003e\n        \u003c\/div\u003e\n      \u003c\/div\u003e\n      \u003cdiv class=\"DAV-bg-light\"\u003e\n        \u003cdiv class=\"DAV-section\"\u003e\n          \u003ch3\u003eSV188P's 99% Reflectivity vs. Standard Silver Diagonals\u003c\/h3\u003e\n          \u003cp\u003eWhile a standard silver-coated diagonal typically offers 95-97% reflectivity, the SVBONY SV188P's 99% dielectric coatings provide a measurable increase in image brightness. This difference is most apparent when observing faint deep-sky objects or resolving low-contrast details on planets at high magnification.\u003c\/p\u003e\n          \u003cul\u003e\n            \u003cli\u003e\n\u003cstrong\u003eBrighter Images:\u003c\/strong\u003e The 2-4% increase in light transmission can be the difference between spotting a faint galaxy arm or seeing only the core.\u003c\/li\u003e\n            \u003cli\u003e\n\u003cstrong\u003eEnhanced Durability:\u003c\/strong\u003e Dielectric coatings do not tarnish or oxidize like silver, offering a longer operational life with consistent optical clarity.\u003c\/li\u003e\n            \u003cli\u003e\n\u003cstrong\u003eTrade-off:\u003c\/strong\u003e The SV188P produces an image that is upright but mirror-reversed (left-to-right), making it perfect for astronomy but unsuitable for terrestrial viewing where correct image orientation is required.\u003c\/li\u003e\n          \u003c\/ul\u003e\n        \u003c\/div\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/li\u003e\n  \u003cli\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n      \u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is a 99% dielectric diagonal like the SVBONY SV188P better than a standard one?\u003c\/h3\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion-A\"\u003e\n      \u003cp\u003eA 99% dielectric diagonal like the \u003cstrong\u003eSVBONY SV188P\u003c\/strong\u003e transmits more of the light gathered by your telescope to the eyepiece. Standard diagonals can lose 5% or more of the light, but the SV188P loses only 1%. This results in brighter, higher-contrast images, which is especially critical for observing faint deep-sky objects like nebulae and galaxies.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n      \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the image orientation through the SVBONY SV188P diagonal?\u003c\/h3\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion-A\"\u003e\n      \u003cp\u003eThe SVBONY SV188P provides an image that is \u003cstrong\u003eupright but mirror-inverted\u003c\/strong\u003e (left and right are reversed). This is standard for astronomical mirror diagonals and is perfectly fine for observing celestial objects, as there is no \"up\" or \"down\" in space. However, it is not suitable for terrestrial viewing.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n      \u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the SVBONY SV188P's brass compression ring protect my eyepieces?\u003c\/h3\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion-A\"\u003e\n      \u003cp\u003eInstead of a single set screw digging into your eyepiece barrel, the SVBONY SV188P uses a \u003cstrong\u003esoft brass compression ring\u003c\/strong\u003e that tightens evenly around the barrel. This provides a secure grip without leaving scratches or gouges, preserving the condition of your valuable eyepieces.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n      \u003ch3 class=\"DAV-accordion-Q\"\u003eWill the SVBONY SV188P work with my refractor or SCT?\u003c\/h3\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion-A\"\u003e\n      \u003cp\u003eYes, the SV188P is designed specifically for telescopes that focus straight through the back, such as \u003cstrong\u003erefractors, Schmidt-Cassegrains (SCTs), and Maksutov-Cassegrains\u003c\/strong\u003e. The 90-degree angle provides a much more comfortable viewing position than looking straight through.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n      \u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the SV188P's 99% reflectivity help when observing faint details on Jupiter with my 8\" SCT?\u003c\/h3\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion-A\"\u003e\n      \u003cp\u003eWhen observing planets like Jupiter, maximizing light throughput is key to seeing subtle, low-contrast features. The SVBONY SV188P's \u003cstrong\u003e99% reflectivity\u003c\/strong\u003e ensures that the faintest details in Jupiter's cloud bands and the Great Red Spot are delivered to your eye with maximum brightness and contrast, making them easier to resolve at high magnification.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n      \u003ch3 class=\"DAV-accordion-Q\"\u003eIs the SVBONY SV188P diagonal suitable for terrestrial viewing, like bird watching?\u003c\/h3\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion-A\"\u003e\n      \u003cp\u003eNo, the SVBONY SV188P is not recommended for terrestrial use. It produces a \u003cstrong\u003emirror-reversed image\u003c\/strong\u003e, meaning text would appear backwards. For correct image orientation for daytime viewing, you would need a 45-degree or 90-degree correct-image prism diagonal.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/li\u003e\n  \u003cli\u003e\n    \u003ctable class=\"DAV-specifications\"\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eBrand\u003c\/td\u003e\n          \u003ctd\u003eSVBONY\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMaterial\u003c\/td\u003e\n          \u003ctd\u003eAluminum Alloy\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eCoatings\u003c\/td\u003e\n          \u003ctd\u003eDielectric\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eReflectivity\u003c\/td\u003e\n          \u003ctd\u003e99%\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eReflection Surface\u003c\/td\u003e\n          \u003ctd\u003eDielectrically Coated\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMirror Thickness\u003c\/td\u003e\n          \u003ctd\u003e11mm\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eImage Orientation\u003c\/td\u003e\n          \u003ctd\u003eErect Image, Mirror Inverted\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eSet Screws\u003c\/td\u003e\n          \u003ctd\u003eM4\u003c\/td\u003e\n        \u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/li\u003e\n  \u003cli\u003e\n    \u003cul class=\"DAV-grid\"\u003e\n      \u003cli class=\"DAV-grid-item\"\u003e\n        \u003cdiv\u003e\n          \u003cp class=\"DAV-item-title\"\u003eSVBONY SV188P 2\" Dielectric Diagonal\u003c\/p\u003e\n          \u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n        \u003c\/div\u003e\n      \u003c\/li\u003e\n       \u003cli class=\"DAV-grid-item\"\u003e\n        \u003cdiv\u003e\n          \u003cp class=\"DAV-item-title\"\u003eDust Caps\u003c\/p\u003e\n          \u003cp class=\"DAV-item-subtitle\"\u003e× 2\u003c\/p\u003e\n        \u003c\/div\u003e\n      \u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/li\u003e\n  \n  \u003cli\u003e\n    \u003ca href=\"https:\/\/davidastro.com\/pages\/svbony-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eSVBONY 1-Year Warranty\u003c\/a\u003e\n  \u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SVBONY","offers":[{"title":"Default Title","offer_id":52861237526813,"sku":"SV-F9171D","price":88.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-SV188P-99-Reflectivity-90-Degree-Dielectric-Mirror-Diagonal-1-F9171D_86aad769-0b9e-4e84-b1cd-45a2397de09e.jpg?v=1788883456"},{"product_id":"svbony-sv221-90-brass-mirror-diagonal-125in","title":"SVBONY SV221 90° Brass Mirror Diagonal - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e90° Deflection Angle for Comfortable Viewing\u003c\/li\u003e\n\u003cli\u003eAluminum-Coated Mirror with \u0026gt;92% Reflectivity\u003c\/li\u003e\n\u003cli\u003eStandard 1.25\" Barrel and Eyepiece Clamp\u003c\/li\u003e\n\u003cli\u003eAccepts 1.25\" Filters via M28.5x0.6 Threads\u003c\/li\u003e\n\u003cli\u003eBrass Compression Ring Prevents Eyepiece Scratches\u003c\/li\u003e\n\u003cli\u003eLightweight 90.5g Construction\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eSVBONY SV221 1.25\" 90° Brass Diagonal for Refractor Telescope\u003c\/h2\u003e\n\u003cp\u003eThe SVBONY SV221 1.25\" 90° Brass Diagonal redirects the light path of your refractor, providing a comfortable viewing angle for objects high in the sky. Its aluminum-coated mirror has a reflectivity greater than 92% across a 29.5mm clear aperture, ensuring bright images with minimal light loss. The integrated M28.5x0.6 thread allows for the use of standard 1.25\" filters, and at just 90.5g, it adds minimal weight to your optical train.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e90° Viewing Angle with \u0026gt;92% Reflectivity\u003c\/h3\u003e\n\u003cp\u003eA 90° diagonal is an essential accessory for any refractor or Schmidt-Cassegrain telescope, eliminating neck strain when observing targets near the zenith. The SVBONY SV221 uses an aluminum-coated mirror with a reflectivity of over 92% to deliver bright, high-contrast views. The 29.5mm clear aperture is large enough to prevent vignetting with standard 1.25\" Plössl eyepieces, preserving the brightness of your telescope's optics. Note that as a mirror diagonal, it provides an image that is vertically correct but horizontally reversed (Erect Image, Mirror Inverted), which is normal for astronomical viewing but not ideal for terrestrial use where correct image orientation is required.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eBrass Ring Clamp and M28.5x0.6 Filter Threads\u003c\/h3\u003e\n\u003cp\u003eThe SV221 is engineered to protect your equipment while enhancing its capabilities. Unlike basic diagonals that use a single screw to hold the eyepiece, this model features a brass compression ring that provides a secure, non-marring grip on your eyepiece barrels, preventing scratches and gouges. The nosepiece is threaded for standard M28.5x0.6 filters, allowing you to easily add a moon filter or light pollution filter to your setup without needing to thread it onto each individual eyepiece.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main purpose of the SVBONY SV221 diagonal?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe SVBONY SV221 is a \u003cstrong\u003e90° mirror diagonal\u003c\/strong\u003e designed for refractor and Schmidt-Cassegrain telescopes. Its primary purpose is to bend the light path at a right angle, allowing you to observe comfortably, especially when the telescope is pointing towards the zenith (straight up).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the brass pressure ring on the SV221 protect my eyepieces?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe brass compression ring provides a significant advantage over simple set-screw designs. When you tighten the clamp, the soft brass ring gently and evenly squeezes the eyepiece barrel. This holds it securely in place without the screw tip digging into the barrel, which prevents the scratches and gouges common with lower-quality diagonals.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use 1.25\" filters with the SVBONY SV221?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The 1.25\" nosepiece of the SVBONY SV221 has standard \u003cstrong\u003eM28.5x0.6 threads\u003c\/strong\u003e. This allows you to screw any standard 1.25\" filter, such as a moon filter or a nebula filter, directly onto the diagonal itself.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the SVBONY SV221 suitable for observing Jupiter with my 80mm refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. The SVBONY SV221 is an excellent choice for planetary viewing with an 80mm refractor. Its \u003cstrong\u003e\u0026gt;92% reflectivity\u003c\/strong\u003e ensures that the bright image of Jupiter (and its moons) reaches your eyepiece with minimal light loss, preserving contrast and detail in the planet's cloud bands. The 90° angle will make observing much more comfortable as Jupiter climbs higher in the sky.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does \"Erect Image, Mirror Inverted\" mean for the view through the SV221?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis describes the image orientation. \"Erect Image\" means the view is right-side up, but \"Mirror Inverted\" means it is flipped left-to-right. For astronomy, this is perfectly acceptable as there is no \"up\" or \"down\" in space. However, it means that text or terrestrial objects would appear backward, making it less suitable for daytime terrestrial viewing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI find it difficult to look through my refractor when it's pointed at the zenith. Will the SVBONY SV221 diagonal help?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this is exactly what the SVBONY SV221 is designed for. By redirecting the light path by \u003cstrong\u003e90°\u003c\/strong\u003e, it allows you to look down into the eyepiece from a comfortable standing or seated position, even when the telescope is aimed directly overhead. This completely solves the issue of having to crouch or kneel to use your refractor.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eSVBONY\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSize\u003c\/td\u003e\n\u003ctd\u003e1.25 inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eMirror Diagonal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDeflection Angle\u003c\/td\u003e\n\u003ctd\u003e90°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReflectivity\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;92%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReflection Surface\u003c\/td\u003e\n\u003ctd\u003eAluminum Coated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClear Aperture\u003c\/td\u003e\n\u003ctd\u003e29.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Orientation\u003c\/td\u003e\n\u003ctd\u003eErect Image, Mirror Inverted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens-Sided Connection\u003c\/td\u003e\n\u003ctd\u003e1.25\" Barrel with M28.5x0.6 Filter Thread\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEyepiece-Sided Connection\u003c\/td\u003e\n\u003ctd\u003e1.25\" Clamp\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClamping System\u003c\/td\u003e\n\u003ctd\u003eBrass Compression Ring with Screw Clamps\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Length\u003c\/td\u003e\n\u003ctd\u003eapprox. 73mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003ePlastic \u0026amp; Metal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet Weight\u003c\/td\u003e\n\u003ctd\u003e90.5g \/ 3.19oz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eSV221 1.25\" 90 Degree Mirror Diagonal\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eM3 Screws\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 3\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDust Cap\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDust Plug\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/svbony-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eSVBONY 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SVBONY","offers":[{"title":"Default Title","offer_id":52861237559581,"sku":"SV-W9178A","price":21.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-SV221-1-25-90-Brass-Diagonal-for-Refractor-Telescope-1_8b7ba08c-cdce-47b8-adc1-807d5a4a713f.jpg?v=1788883600"},{"product_id":"svbony-sv221-45-correct-image-prism-diagonal-125in","title":"SVBONY SV221 45° Correct Image Prism Diagonal - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eProduces a fully erect, non-reversed image\u003c\/li\u003e\n\u003cli\u003eComfortable 45° viewing angle for terrestrial observation\u003c\/li\u003e\n\u003cli\u003eStandard 1.25\" barrel fits most refractor telescopes\u003c\/li\u003e\n\u003cli\u003eFeatures a 19mm clear aperture\u003c\/li\u003e\n\u003cli\u003eThreaded (M28.5x0.6) to accept 1.25\" filters\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eSVBONY SV221 45-Degree Erecting Prism Diagonal for Refractor Telescope\u003c\/h2\u003e\n\u003cp\u003eThe SVBONY SV221 converts your refractor for terrestrial viewing, delivering a fully erect, non-reversed image at a comfortable 45° angle. It fits standard 1.25 inch focusers, features a 19mm clear aperture for bright views, and adds approximately 86mm of optical length to your light path. Weighing only 79g, this multi-coated prism diagonal is threaded for M28.5x0.6 filters, making it a lightweight and versatile addition to your kit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eCorrect-Image Views at a Comfortable 45° Angle\u003c\/h3\u003e\n\u003cp\u003eThe primary function of the SV221 is to correct the inverted and reversed image produced by a refractor telescope. Its internal prism system delivers an erect, non-reversed view, just as you see with your naked eye, making it intuitive to track moving subjects like birds, ships, or wildlife. The 45° deflection provides a much more comfortable viewing posture for daytime observation compared to looking straight through the telescope.\u003c\/p\u003e\n\u003cp\u003eThe multi-coated prism and 19mm clear aperture ensure that the image remains bright and clear. This makes the SV221 an essential accessory for transforming your astronomical refractor into a powerful, long-range spotting scope for terrestrial use.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eSecure Clamping and 1.25\" Filter Compatibility\u003c\/h3\u003e\n\u003cp\u003eThe SV221 is constructed with a durable, precision-molded plastic main body and machined aluminum barrels for a secure fit. Unlike basic diagonals that use a single screw to hold the eyepiece, this model features a brass compression ring that provides a firm, even grip without scratching or marring your eyepiece barrels. This secure connection maintains optical alignment and protects your equipment.\u003c\/p\u003e\n\u003cp\u003eFor added versatility, the 1.25\" nosepiece is threaded for standard M28.5x0.6 filters. You can easily attach a moon filter, a light pollution filter, or colored planetary filters to enhance your views without needing a separate filter cell.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eSV221 Erecting Prism vs. a Standard Mirror Diagonal\u003c\/h3\u003e\n\u003cp\u003eIt's important to choose the right diagonal for your purpose. While both redirect light for comfortable viewing, they produce very different images.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard Mirror Diagonal:\u003c\/strong\u003e A typical \"star diagonal\" uses a mirror to bend the light path. This produces an image that is upright but reversed left-to-right. This is perfectly acceptable for astronomy, as stars are points of light, but it can be disorienting for terrestrial viewing where \"left is left\" matters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSVBONY SV221 Erecting Prism:\u003c\/strong\u003e This diagonal uses a prism to provide a fully corrected image—upright and not reversed. This is the ideal choice for daytime, terrestrial observation with a refractor or Maksutov-Cassegrain, as it makes panning and tracking objects natural and intuitive.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy do I need the SVBONY SV221 for daytime viewing with my refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA refractor telescope naturally produces an image that is upside-down and backward. The SVBONY SV221 uses a 45° prism to correct this, delivering an \u003cstrong\u003eerect and non-reversed image\u003c\/strong\u003e. This makes it possible to use your astronomy telescope as a high-power spotting scope for activities like birdwatching or landscape viewing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the SVBONY SV221 work with my Newtonian telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. The SVBONY SV221 is designed for refractor and Cassegrain-type telescopes. A Newtonian reflector does not have enough focuser travel to reach focus with the additional \u003cstrong\u003e86mm optical length\u003c\/strong\u003e of a prism diagonal. Newtonians require very low-profile focusers and do not typically use diagonals in the same way.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use 1.25\" filters with the SVBONY SV221 diagonal?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The 1.25\" barrel of the SV221 has standard \u003cstrong\u003eM28.5x0.6 filter threads\u003c\/strong\u003e. This allows you to attach any standard 1.25\" filter, such as a moon filter for reducing glare or a light pollution filter for enhancing contrast on celestial objects.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the advantage of the SVBONY SV221's clamping system?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe SV221 features a brass compression ring inside the eyepiece holder. When you tighten the screw, this ring tightens evenly around the eyepiece barrel. This is superior to a simple screw which can scratch or dent your eyepieces and potentially cause a slight tilt.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the SVBONY SV221 suitable for high-magnification planetary viewing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile the SVBONY SV221 can be used for astronomy, it is primarily optimized for lower-power terrestrial viewing. Prism diagonals can sometimes introduce a small amount of chromatic aberration (false color) at very high magnifications. For critical, high-power observation of planets like Jupiter or Saturn, a high-quality mirror diagonal is often preferred by discerning astronomers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 45° angle of the SV221 affect observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e45° angle\u003c\/strong\u003e is ideal for terrestrial viewing, as you are typically looking at objects at or near the horizon. This provides a comfortable, natural neck position. For astronomical viewing, a 90° diagonal is often preferred, as it makes it easier to view objects that are high overhead, near the zenith.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eSVBONY\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eSV221\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003ePrism Diagonal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e1.25 inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDeflection Angle\u003c\/td\u003e\n\u003ctd\u003e45°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Orientation\u003c\/td\u003e\n\u003ctd\u003eErect image, non-reversed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClear Aperture\u003c\/td\u003e\n\u003ctd\u003e19mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eMulti-Coated (MC)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEyepiece Connection\u003c\/td\u003e\n\u003ctd\u003e1.25\" Clamp with Screw\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Threads\u003c\/td\u003e\n\u003ctd\u003eM28.5x0.6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Length\u003c\/td\u003e\n\u003ctd\u003eappr. 86mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003ePlastic \u0026amp; Metal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet Weight\u003c\/td\u003e\n\u003ctd\u003e79g \/ 2.78oz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eSV221 1.25\" 45 Degree Correct Image Prism Diagonal\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eM3 Screws\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 3\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDust Cap\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDust Plug\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/svbony-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eSVBONY Warranty Policy\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SVBONY","offers":[{"title":"Default Title","offer_id":52861237592349,"sku":"SV-W9178B","price":25.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-SV221-45-Degree-Erecting-Prism-Diagonal-for-Refractor-Telescope-1_1489e9fd-f5d1-483a-8a02-fee8a0ff304d.jpg?v=1788883589"},{"product_id":"svbony-sv222-45-correct-image-prism-diagonal-fmc-125in","title":"SVBONY SV222 45° Correct Image Prism Diagonal FMC - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eProduces an erect, non-reversed image for terrestrial and astronomical viewing\u003c\/li\u003e\n\u003cli\u003e45° deflection angle provides a comfortable viewing position\u003c\/li\u003e\n\u003cli\u003ePhase-coated BK7 prism for enhanced image contrast and brightness\u003c\/li\u003e\n\u003cli\u003eFits standard 1.25-inch focusers and eyepieces\u003c\/li\u003e\n\u003cli\u003eCNC machined aluminum body weighs only 167g\u003c\/li\u003e\n\u003cli\u003eFeatures a 16mm clear aperture and accepts 1.25\" filters (M28.5x0.6)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eSvbony SV222 1.25\" 45° Correct Image Diagonal FMC Phase Coating\u003c\/h2\u003e\n\u003cp\u003eThe Svbony SV222 1.25\" Correct Image Diagonal uses a 45° BK7 prism to deliver a correctly oriented, non-reversed image suitable for both daytime terrestrial viewing and astronomical observation. Its phase-coated and fully multi-coated optics pass through a 16mm clear aperture, providing high-contrast views with an optical path length of approximately 93mm. The entire CNC-machined aluminum body weighs a mere 167g, adding minimal weight to your refractor or catadioptric telescope setup.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA 45° Erect, Non-Reversed View for Terrestrial and Astro Use\u003c\/h3\u003e\n\u003cp\u003eUnlike a standard 90° star diagonal that produces a mirror-reversed image, the SV222's prism design corrects the view completely. This means left is left and right is right, just as you see with your naked eye. This intuitive orientation is essential for terrestrial applications like birdwatching or landscape viewing, transforming your astronomical telescope into a high-power spotting scope. The 45° viewing angle is more natural for daytime use than a 90° angle, reducing neck strain during extended sessions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003ePhase-Coated BK7 Prism: Maximizing Contrast with a 16mm Aperture\u003c\/h3\u003e\n\u003cp\u003eThe heart of the SV222 is its BK7 prism, which features both full multi-coatings and advanced phase coatings. Phase correction is a critical treatment that eliminates destructive interference within the prism, resulting in a measurable increase in image contrast and resolution. This allows you to resolve finer details on planets and see fainter stars against a darker sky background. The interior of the diagonal is blackened and baffled to absorb stray light, further enhancing contrast. The 16mm clear aperture is sufficient for most planetary and lunar eyepieces, though it may cause slight vignetting with very long focal length 1.25\" eyepieces that have wide field stops.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eCNC Aluminum Build with a 1.25\" Non-Marring Brass Clamp\u003c\/h3\u003e\n\u003cp\u003eThe SV222 is built from a single piece of CNC-machined aluminum with a durable anodized finish, ensuring precise optical alignment and longevity. The 1.25\" eyepiece holder uses a brass compression ring instead of a simple screw, which clamps your eyepieces securely without scratching or marring their barrels. The 1.25\" nosepiece is threaded to accept standard M28.5x0.6 filters, allowing you to easily add a moon filter or light pollution filter to your observing chain.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy choose the Svbony SV222 45° diagonal over a standard 90° star diagonal?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eChoose the \u003cstrong\u003eSvbony SV222\u003c\/strong\u003e when you need a correctly oriented, non-reversed image. This is essential for daytime terrestrial viewing (birdwatching, nature) where a mirror-image from a standard diagonal would be disorienting. The 45° angle is also often more comfortable for daytime use. For purely astronomical viewing, a 90° diagonal is typically preferred for its more comfortable angle when observing objects high in the sky.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does \"phase coating\" do on the SV222's prism?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003ePhase coatings\u003c\/strong\u003e correct for a phenomenon called \"phase shift\" that occurs when light is reflected within a prism. This correction prevents destructive light wave interference, resulting in significantly improved image contrast, resolution, and brightness compared to an uncoated prism. It's a premium feature that helps the SV222 deliver sharper views.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Svbony SV222 with my Newtonian reflector telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eNo.\u003c\/strong\u003e The Svbony SV222 has an optical path length of approximately 93mm, which is too long for a standard Newtonian reflector. You will not be able to rack the focuser in far enough to reach focus. This diagonal is designed specifically for refracting and catadioptric (SCT, Maksutov) telescopes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the SV222's 16mm clear aperture cause vignetting with my eyepieces?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e16mm clear aperture\u003c\/strong\u003e is generally well-matched for most 1.25\" eyepieces used for planetary, lunar, and double star observing. However, you may experience some vignetting (darkening at the edge of the field) if you use a 1.25\" eyepiece with a very long focal length (like a 32mm or 40mm Plössl) that has a field stop larger than 16mm.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Svbony SV222 perform for birdwatching with a small 80mm f\/7 refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eSvbony SV222\u003c\/strong\u003e is an excellent match for this scenario. It will provide a correctly oriented, high-contrast image, making it easy to follow birds in motion. The 45° angle is comfortable for viewing subjects at or near the horizon, and the phase-coated optics will help resolve fine feather details and subtle color variations.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the SV222 a good choice for viewing the Moon and planets with a Maksutov-Cassegrain?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it is a very capable choice. While the 45° angle might be less comfortable than a 90° for objects directly overhead, the phase-coated optics of the \u003cstrong\u003eSvbony SV222\u003c\/strong\u003e will deliver sharp, high-contrast views of lunar craters, Jupiter's cloud bands, and Saturn's rings. The correct-image orientation can also make it easier to navigate the lunar surface using a map.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eSVBONY\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003ePrism Diagonal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrism Material\u003c\/td\u003e\n\u003ctd\u003eBK7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDeflection Angle\u003c\/td\u003e\n\u003ctd\u003e45°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Orientation\u003c\/td\u003e\n\u003ctd\u003eErect image, non-reversed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e1.25 inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClear Aperture\u003c\/td\u003e\n\u003ctd\u003e16mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eFully Multi-Coated + Phase Coatings\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Length\u003c\/td\u003e\n\u003ctd\u003eapprox. 93mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Threads\u003c\/td\u003e\n\u003ctd\u003eM28.5x0.6 (Lens Sided)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEyepiece Connection\u003c\/td\u003e\n\u003ctd\u003e1.25\" Clamp\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClamping System\u003c\/td\u003e\n\u003ctd\u003eBrass Compression Ring with Screw\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Material\u003c\/td\u003e\n\u003ctd\u003eCNC Metal Aluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet Weight\u003c\/td\u003e\n\u003ctd\u003e167g \/ 5.87oz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eSV222 1.25\" 45° Metal Correct Image Prism Diagonal\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eM4 Screws\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDust Cap\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDust Plug\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/svbony-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eSVBONY Warranty Policy\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SVBONY","offers":[{"title":"Default Title","offer_id":52861237657885,"sku":"SV-W9179A","price":56.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-SV222-1-25-45-Correct-Image-Diagonal-FMC-Phase-Coating-1_2cd5b71e-12ee-4d0e-8e90-43f927cbc48a.jpg?v=1788883612"},{"product_id":"svbony-sv222-90-erect-image-prism-diagonal-125in","title":"SVBONY SV222 90° Erect Image Prism Diagonal - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eProduces a 90° erect, non-reversed image\u003c\/li\u003e\n\u003cli\u003eStandard 1.25-inch barrel size\u003c\/li\u003e\n\u003cli\u003eBK7 prism with anti-reflection coatings\u003c\/li\u003e\n\u003cli\u003e19mm clear aperture\u003c\/li\u003e\n\u003cli\u003eCNC machined aluminum body\u003c\/li\u003e\n\u003cli\u003eThreaded for M28.5x0.6 filters\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eSvbony SV222 1.25\" 90° Erect Prism Diagonal\u003c\/h2\u003e\n\u003cp\u003eThe Svbony SV222 1.25\" 90° Erect Prism Diagonal corrects the view in your refractor or Cassegrain telescope, delivering an upright and non-reversed image essential for terrestrial observation. Its BK7 prism provides a 19mm clear aperture, and the entire CNC-machined aluminum unit adds only 153.8g to your optical train. The optical path length is approximately 65.6mm, and the barrel is threaded to accept standard M28.5x0.6 filters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e90° BK7 Prism: Correct Orientation for Land and Sky\u003c\/h3\u003e\n\u003cp\u003eThe core of the SV222 is a BK7 glass prism that deflects light 90°, providing a comfortable viewing angle while producing an \"erect image, non-reversed\" orientation. This is critical for daytime use like birdwatching or landscape viewing, where a standard astronomy diagonal's mirror-reversed image is disorienting. For astronomy, it makes navigating with star charts more intuitive, as the view in the eyepiece matches the chart exactly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eCNC Machined Body with a 19mm Clear Aperture\u003c\/h3\u003e\n\u003cp\u003eConstructed from CNC-machined aluminum, the SV222 body is built for durability and precise alignment. The interior is blackened and baffled around the 19mm clear aperture to absorb stray light, preventing internal reflections from reducing image contrast. This ensures a darker background sky and sharper details on both celestial and terrestrial targets.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eSecure Clamping and M28.5x0.6 Filter-Ready Design\u003c\/h3\u003e\n\u003cp\u003eThe SV222 uses a screw clamp system to securely hold your 1.25\" eyepieces, preventing wobble and maintaining optical alignment. This mechanism provides a firm grip without marring the eyepiece barrel. The 1.25\" nosepiece is threaded for M28.5x0.6 filters, allowing you to easily add a moon filter, light pollution filter, or planetary color filters to enhance your view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eSV222 Erecting Prism vs. Standard Mirror Diagonal\u003c\/h3\u003e\n\u003cp\u003eChoosing between an erecting prism and a mirror diagonal depends entirely on your primary use case. Both provide a comfortable 90° viewing angle, but the image orientation is fundamentally different.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSV222 Erecting Prism:\u003c\/strong\u003e Delivers a fully correct image (upright and not reversed left-to-right). This is non-negotiable for terrestrial viewing and highly convenient for beginners learning to navigate the sky with charts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard Mirror Diagonal:\u003c\/strong\u003e Produces an image that is upright but reversed left-to-right. For purely astronomical deep-sky observing, a high-quality dielectric mirror diagonal may offer slightly higher light transmission, though the SV222's anti-reflection coatings deliver bright, high-contrast images suitable for all-around use.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy do I need an erect image diagonal like the SVBONY SV222 for my refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA refractor or SCT naturally produces an image that is upside-down and reversed. A standard star diagonal corrects the up-down orientation but leaves it mirror-reversed. The \u003cstrong\u003eSVBONY SV222\u003c\/strong\u003e is an erecting prism that corrects both, delivering a view that is upright and correctly oriented left-to-right, just as you see with your naked eye. This is essential for daytime terrestrial viewing and makes astronomical navigation with star charts much more intuitive.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the SVBONY SV222 for observing planets like Jupiter in my 8\" SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, absolutely. The SV222 is a great choice for planetary viewing in a Schmidt-Cassegrain or refractor. Its anti-reflection coated BK7 prism provides sharp, high-contrast images, allowing you to resolve details like Jupiter's cloud bands or Saturn's rings. The correct image orientation can also make it easier to track the planet's movement across the sky.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the SV222 a good choice for birdwatching with an 80mm refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe SV222 is an ideal choice for this application. Its primary function is to provide a correctly oriented image, which is exactly what you need for terrestrial use like birdwatching. The 90° angle is comfortable for viewing subjects at various elevations, and the all-metal construction ensures it can handle field use.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the difference between this SV222 prism diagonal and a mirror diagonal?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe main difference is the image orientation. The \u003cstrong\u003eSV222 prism diagonal\u003c\/strong\u003e provides a fully corrected, non-reversed image. A \u003cstrong\u003emirror diagonal\u003c\/strong\u003e provides an image that is right-side-up but reversed left-to-right. For terrestrial viewing, the prism is necessary. For astronomy, it's a matter of preference; some purists prefer high-end mirror diagonals for maximum light transmission on faint deep-sky objects, while many find the prism's correct view more convenient.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the SVBONY SV222 accept 1.25\" astronomy filters?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The 1.25\" nosepiece that inserts into your telescope's focuser is threaded with a standard \u003cstrong\u003eM28.5x0.6 thread\u003c\/strong\u003e. This allows you to attach any standard 1.25\" filter, such as a moon filter, a light pollution filter, or colored planetary filters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the SV222 correct the image in a Newtonian telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. This diagonal is designed for refractors, Maksutov-Cassegrains, and Schmidt-Cassegrains. Newtonian reflectors have a different optical design and typically do not have enough focus travel to accommodate a prism diagonal. You would not be able to reach focus with the SV222 in a standard Newtonian.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eSVBONY\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eSV222\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSize\u003c\/td\u003e\n\u003ctd\u003e1.25 inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003e90° Prism Diagonal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrism Material\u003c\/td\u003e\n\u003ctd\u003eBK7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Orientation\u003c\/td\u003e\n\u003ctd\u003eErect image, non-reversed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDeflection Angle\u003c\/td\u003e\n\u003ctd\u003e90°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClear Aperture\u003c\/td\u003e\n\u003ctd\u003e19mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoating\u003c\/td\u003e\n\u003ctd\u003eAnti-reflection coating\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Material\u003c\/td\u003e\n\u003ctd\u003eCNC Metal Aluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClamping System\u003c\/td\u003e\n\u003ctd\u003eScrew clamps\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEyepiece Side Connection\u003c\/td\u003e\n\u003ctd\u003e1.25\" Clamp\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTelescope Side Connection\u003c\/td\u003e\n\u003ctd\u003e1.25\" Barrel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Thread\u003c\/td\u003e\n\u003ctd\u003eM28.5x0.6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Length\u003c\/td\u003e\n\u003ctd\u003eappr. 65.6mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet Weight\u003c\/td\u003e\n\u003ctd\u003e153.8g \/ 5.43oz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eSV222 1.25\" 90° Metal Correct Image Prism Diagonal\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eM4 Screws\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDust Cap\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDust Plug\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/svbony-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eSVBONY 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SVBONY","offers":[{"title":"Default Title","offer_id":52861237756189,"sku":"SV-W9179B","price":91.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-SV222-1-25-90-Erect-Prism-Diagonal-AR-Coating-Metal-Mount-1_987b12dc-40aa-494c-9004-844259ce7c79.jpg?v=1788883625"},{"product_id":"svbony-sv223-90-clicklock-dielectric-mirror-diagonal-125in","title":"SVBONY SV223 90° ClickLock Dielectric Mirror Diagonal - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eReflects over 99% of incoming light with a lab-tested dielectric coating\u003c\/li\u003e\n\u003cli\u003eFeatures a 1.25\" Clicklock mechanism for fast, secure eyepiece changes\u003c\/li\u003e\n\u003cli\u003eProvides a comfortable 90° viewing angle for refractors and SCTs\u003c\/li\u003e\n\u003cli\u003e25mm clear aperture minimizes vignetting with low-power 1.25\" eyepieces\u003c\/li\u003e\n\u003cli\u003eAccepts standard 1.25\" filters with M28.5x0.6 threads\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eSvbony SV223 1.25\" 90° Clicklock Dielectric Diagonal Mirror\u003c\/h2\u003e\n\u003cp\u003eThe Svbony SV223 1.25\" 90° Clicklock Dielectric Diagonal Mirror combines a lab-tested dielectric mirror with \u0026gt;99% reflectivity and a secure Clicklock clamping system. This design directs the maximum amount of light from your telescope to your eyepiece through its 25mm clear aperture, providing brighter, higher-contrast views than standard diagonals. The robust metal body adds only 249g to your optical train while ensuring your eyepieces are held with absolute stability.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe SV223's \u0026gt;99% Reflectivity Dielectric Mirror\u003c\/h3\u003e\n\u003cp\u003eAt the core of the SV223 is a precision 11.5mm thick optical flat mirror with a multi-layer dielectric coating. This advanced coating achieves over 99% reflectivity across the visual spectrum, preventing the light loss common in standard aluminum or silver-coated diagonals. The result is a tangible increase in image brightness and contrast, allowing you to resolve finer details on planets and detect fainter stars in clusters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eInstant Security: The 1.25\" Clicklock Clamping System\u003c\/h3\u003e\n\u003cp\u003eFumbling with small thumbscrews in the dark is eliminated with the SV223's Clicklock mechanism. A simple twist of the outer ring engages a three-point clamp, securely centering and locking your 1.25\" eyepiece or accessory in place without marring the barrel. This system provides a solid, repeatable connection that maintains perfect alignment, critical for high-magnification planetary viewing or imaging.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFast Clamping Action:\u003c\/strong\u003e Lock or release any 1.25\" accessory in seconds with a gentle twist, even while wearing gloves.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDamage-Free Design:\u003c\/strong\u003e The internal compression ring grips the eyepiece barrel evenly, avoiding the scratches and dents caused by single thumbscrews.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBaffled Interior:\u003c\/strong\u003e The metal housing is internally baffled and blackened to absorb stray light, further enhancing image contrast by preventing internal reflections.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eSV223 Dielectric vs. Standard Diagonals: A Clear Upgrade\u003c\/h3\u003e\n\u003cp\u003eCompared to a standard prism or aluminum-coated mirror diagonal, the SV223 offers a significant step up in optical and mechanical stability. While a standard diagonal might reflect 88-92% of light, the SV223's \u0026gt;99% dielectric coating delivers a noticeably brighter image at the eyepiece.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard Aluminum Mirror:\u003c\/strong\u003e Typically has lower reflectivity and is prone to degradation over time, reducing brightness and contrast. The SV223's dielectric coating is far more durable and maintains its reflectivity for years.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrism Diagonal:\u003c\/strong\u003e Can introduce chromatic aberration in fast telescopes (below f\/7), whereas the SV223 mirror is color-neutral at any focal ratio.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThumbscrew Clamp:\u003c\/strong\u003e A single thumbscrew can cause eyepiece tilt and damage barrels. The SV223's Clicklock ensures perfect centering and a secure, damage-free grip every time.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main advantage of the SV223's Clicklock system?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary advantage of the \u003cstrong\u003eClicklock clamping system\u003c\/strong\u003e is its ability to securely and perfectly center any 1.25\" eyepiece with a simple twist. This eliminates the risk of eyepiece tilt that can occur with single-thumbscrew diagonals and prevents scratches or dents on your eyepiece barrels.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the SV223's \u0026gt;99% reflectivity affect views of Jupiter in my 8\" SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIn an 8\" SCT, the SV223's \u0026gt;99% reflectivity provides a visibly brighter image of Jupiter compared to a standard diagonal with ~90% reflectivity. This increased light throughput enhances the contrast of subtle features like the Great Red Spot (GRS) and delicate cloud bands, making them easier to resolve at high magnification.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs a dielectric mirror like the one in the SV223 better than a prism diagonal?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor most telescopes, especially \"fast\" refractors or Newtonians (f\/7 or lower), a dielectric mirror diagonal like the SV223 is superior. It introduces zero chromatic aberration (false color), unlike a prism which can create color fringing on bright objects in fast optical systems. The SV223's mirror design ensures color-pure images regardless of your telescope's focal ratio.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use 1.25\" filters with the Svbony SV223 diagonal?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The 1.25\" nosepiece of the SV223 diagonal has standard \u003cstrong\u003eM28.5x0.6 threads\u003c\/strong\u003e, allowing you to attach any 1.25\" astronomical filter, such as a moon filter, light pollution filter, or planetary color filters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the SV223's 25mm clear aperture cause vignetting with my 32mm Plössl eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. A 32mm Plössl eyepiece has a field stop of approximately 27mm, but since it is placed after the diagonal, the diagonal's \u003cstrong\u003e25mm clear aperture\u003c\/strong\u003e is sufficient to fully illuminate the field of view without causing vignetting. It is well-matched for all standard 1.25\" eyepiece designs.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the optical length of the SV223 and why does it matter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe SV223 has an \u003cstrong\u003eoptical length of approximately 85.5mm\u003c\/strong\u003e. This is the amount of light path it adds to your telescope's focal plane. This is a standard length for 1.25\" diagonals and should allow most refractors and SCTs to reach focus without issue. However, for some Newtonians not designed for visual use, you may need to check your focuser's travel range.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eSVBONY\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eSV223\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSize\u003c\/td\u003e\n\u003ctd\u003e1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDeflection Angle\u003c\/td\u003e\n\u003ctd\u003e90°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eMirror Diagonal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReflectivity\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;99%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReflection Surface\u003c\/td\u003e\n\u003ctd\u003eDielectrically Coated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClear Aperture\u003c\/td\u003e\n\u003ctd\u003e25mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClamping System\u003c\/td\u003e\n\u003ctd\u003eClicklock\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Threads (Lens Side)\u003c\/td\u003e\n\u003ctd\u003eM28.5x0.6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEyepiece Connection\u003c\/td\u003e\n\u003ctd\u003e1.25\" Clamp\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTelescope Connection\u003c\/td\u003e\n\u003ctd\u003e1.25\" Barrel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Orientation\u003c\/td\u003e\n\u003ctd\u003eErect image, Mirror Inverted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Length\u003c\/td\u003e\n\u003ctd\u003eapprox. 85.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMirror Thickness\u003c\/td\u003e\n\u003ctd\u003e11.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eMetal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet Weight\u003c\/td\u003e\n\u003ctd\u003e249g \/ 8.78oz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eSV223 1.25\" 90° Clicklock Dielectric Diagonal Mirror\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eM4 Screw\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDust Cap (Eyepiece Side)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDust Plug (Barrel Side)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eThis accessory does not require software or a dedicated manual for operation.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/svbony-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eSVBONY 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SVBONY","offers":[{"title":"Default Title","offer_id":52861237788957,"sku":"SV-W9180A","price":130.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-SV223-1-25-90-Clicklock-Dielectric-Diagonal-Mirror-1_8c17c21e-19dd-4563-a0d2-a665fb600186.jpg?v=1788883638"}],"url":"https:\/\/davidastro.com\/collections\/diagonals.oembed?page=3","provider":"David Astro","version":"1.0","type":"link"}