{"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","url":"https:\/\/davidastro.com\/products\/tele-vue-90-degree-enhanced-aluminum-diagonal-1-25-inch","provider":"David Astro","version":"1.0","type":"link"}