{"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\/products\/svbony-sv223-90-clicklock-dielectric-mirror-diagonal-125in","provider":"David Astro","version":"1.0","type":"link"}