{"product_id":"daystar-2-inch-dielectric-mirror-diagonal","title":"Daystar 2\" Dielectric Mirror Diagonal","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e2.0\" Barrel Size\u003c\/li\u003e\n\u003cli\u003eDielectric Mirror Coating\u003c\/li\u003e\n\u003cli\u003eFor Telescopes with 2\" Focusers\u003c\/li\u003e\n\u003cli\u003e90-Degree Viewing Angle\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\u003eDaystar 2\" Dielectric Mirror Diagonal\u003c\/h2\u003e\n      \u003cp\u003eThe DS2MD 2.0\" Diagonal uses a multi-layer dielectric mirror coating to deliver maximum light transmission and image brightness from your telescope to your 2-inch eyepieces. This design ensures that the faintest details in nebulae and galaxies are not lost, providing a significant upgrade over standard aluminum or prism diagonals.\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\u003eA 2\" Dielectric Mirror for High-Reflectivity Viewing\u003c\/h3\u003e\n      \u003cp\u003eA diagonal is a critical component in the optical path of any refractor, SCT, or Maksutov-Cassegrain telescope. The DS2MD employs a dielectric coating, which consists of dozens of micro-thin layers of material deposited on the mirror surface. This technology provides higher reflectivity across the visual spectrum compared to standard aluminum coatings, resulting in brighter, higher-contrast views.\u003c\/p\u003e\n      \u003cp\u003eUnlike conventional coatings that can degrade over time from oxidation, dielectric coatings are exceptionally durable and resistant to environmental factors. This ensures the diagonal maintains its peak optical throughput for years of use. The 2-inch barrel accommodates wide-field eyepieces, making it ideal for sweeping the Milky Way or framing large deep-sky objects.\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 advantage of a dielectric diagonal like the DS2MD 2.0\"?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe primary advantages are \u003cstrong\u003ehigher light transmission\u003c\/strong\u003e and \u003cstrong\u003eincreased durability\u003c\/strong\u003e. Dielectric coatings reflect more light than standard aluminum coatings, leading to brighter images at the eyepiece. They are also much harder and more resistant to scratching and environmental degradation, ensuring a long service life.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhen should I use a 2-inch diagonal like the DS2MD?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eA 2-inch diagonal is necessary when you want to use 2-inch eyepieces, which are required for achieving the widest possible true fields of view. This is especially beneficial for observing large objects like the Andromeda Galaxy (M31) or the North American Nebula (NGC 7000) in long focal length telescopes like SCTs and refractors.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eIs the DS2MD 2.0\" Diagonal compatible with my SCT?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes, the DS2MD 2.0\" Diagonal is compatible with any Schmidt-Cassegrain, Maksutov-Cassegrain, or refractor telescope that is equipped with a 2-inch focuser or a 2-inch visual back. The diagonal's nosepiece inserts directly into the focuser, and your 2-inch eyepiece then inserts into the diagonal.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhy choose a mirror diagonal over a prism diagonal for the DS2MD?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eMirror diagonals like the DS2MD are generally preferred for all telescope types, especially reflectors and large SCTs, because they introduce no chromatic aberration. While high-quality prism diagonals can perform well in refractors, a dielectric mirror provides consistently high reflectivity across all wavelengths and avoids potential optical issues, making it a more universal choice for critical observing.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the DS2MD 2.0\" Diagonal come with adapters?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eBased on the available information, this product includes the 2.0\" diagonal itself. A separate 2\" to 1.25\" adapter would be required to use 1.25\" eyepieces. Please check the \"In the Box\" tab for a complete list of included items.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWill the DS2MD 2.0\" Diagonal reach focus in my Newtonian reflector?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eNo. Diagonals like this are designed for refractors and catadioptric telescopes (SCTs, Maks). Newtonian reflectors typically do not have enough focuser \"in-travel\" to reach focus with a star diagonal, as their optical design already includes a secondary mirror that directs light out the side of the tube.\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\u003eType\u003c\/td\u003e\n\u003ctd\u003eStar Diagonal\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e2.0\"\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMirror\/Prism\u003c\/td\u003e\n\u003ctd\u003eDielectric Coated Mirror\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    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/li\u003e\n\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\/daystar-filters-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eDaystar Filters Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Daystar Filters","offers":[{"title":"Default Title","offer_id":52935164985629,"sku":"DAY-DS2MD","price":223.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/DaystarFilters-DS2MD-2-0-Diagonal-1_7e4c1942-9951-4be7-9663-a3ef5a8282da.jpg?v=1789520802","url":"https:\/\/davidastro.com\/fr\/products\/daystar-2-inch-dielectric-mirror-diagonal","provider":"David Astro","version":"1.0","type":"link"}