{"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":450.0,"currency_code":"USD","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","url":"https:\/\/davidastro.com\/en-eu\/products\/tele-vue-90-degree-everbrite-diagonal-2-inch","provider":"David Astro","version":"1.0","type":"link"}