{"product_id":"orion-optics-uk-secondary-dew-heater-ag16-odk16-carbon-fibre","title":"Orion Optics UK Dew Heater for Sec. 16″","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003ePrevents dew formation on secondary mirrors\u003c\/li\u003e\n\u003cli\u003eCustom-designed for 16-inch Orion Optics UK telescopes\u003c\/li\u003e\n\u003cli\u003eEssential for all-night imaging and observing sessions\u003c\/li\u003e\n\u003cli\u003eMaintains optical clarity in damp conditions\u003c\/li\u003e\n\u003cli\u003eCompatible with AG16 and ODK16 models\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\u003eDew Heater for Sec. 16″\u003c\/h2\u003e\n\u003cp\u003eThe Orion Optics UK Dew Heater is the essential accessory for protecting the secondary mirror of your 16-inch AG16 or ODK16 telescope from moisture. Specifically engineered for these large-aperture systems, this heater gently warms the secondary optic just enough to prevent the formation of dew, ensuring your imaging or observing session is not cut short by changing atmospheric conditions.\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 16-inch Secondary Mirror\u003c\/h3\u003e\n\u003cp\u003eIn open-tube astrographs like the ODK16, the secondary mirror is highly exposed to the night sky and is often the first surface to collect dew. This heater applies a minimal, uniform amount of heat directly to the mirror's backing, keeping its surface temperature just above the dew point without introducing tube currents or degrading the high-precision figure of your Orion Optics UK primary.\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 a secondary dew heater critical for a 16\" Orion Optics UK telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eLarge, exposed secondary mirrors on open-tube designs like the AG16 and ODK16 have significant thermal mass and radiate heat quickly, making them highly susceptible to dew. A dedicated heater is the only reliable way to prevent moisture from condensing on the optical surface, which can ruin a night of imaging or observation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Orion Optics UK Dew Heater for Sec. 16\" cause tube currents?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this heater is designed to apply very low, gentle warmth. When used with a proper dew controller (sold separately), it raises the mirror temperature only slightly above the ambient dew point, which is not enough to induce image-degrading thermal currents within the optical tube.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs this dew heater compatible with my 16-inch telescope from another brand?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis heater is specifically designed for the secondary mirror mounts and dimensions of the Orion Optics UK 16-inch AG16 and ODK16 models. While it may physically fit other 16-inch systems, proper fit and thermal contact are not guaranteed.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need a separate controller for the Orion Optics UK Dew Heater?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this is a heater element only and requires a dew heater controller to power it and regulate the heat output. Using a controller is essential for providing the right amount of power to prevent dew without overheating the optic.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Dew Heater for Sec. 16\" help when imaging faint nebulae like the Cygnus Loop?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eImaging faint, extended targets like the Cygnus Loop (NGC 6960, NGC 6992) requires long, uninterrupted exposures over many hours. The slightest bit of dew on the secondary mirror will scatter light, reduce contrast, and obscure faint detail. This heater ensures your optical surface remains perfectly clear from dusk until dawn, protecting the integrity of your data.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow is the Orion Optics UK Dew Heater for Sec. 16\" installed?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eTypically, a secondary dew heater is mounted to the back of the secondary mirror itself, inside the mirror holder. The power cable is then routed along one of the spider vanes to the outside of the telescope tube. Professional installation may be required if you are not comfortable disassembling the secondary mirror holder.\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\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eOrion Optics UK 16\" AG16 \u0026amp; ODK16 Telescopes\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\u003ca href=\"https:\/\/davidastro.com\/pages\/orion-optics-uk-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eOrion Optics UK 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Orion Optics UK","offers":[{"title":"Default Title","offer_id":52942371062045,"sku":"OOUK-SECONDARY-DEW-HEATER-AG16-ODK16","price":989.14,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Orion-Optics-UK-Logo_e5797f39-9fe4-475b-bf6a-972af4704952.jpg?v=1789607106","url":"https:\/\/davidastro.com\/fr-us\/products\/orion-optics-uk-secondary-dew-heater-ag16-odk16-carbon-fibre","provider":"David Astro","version":"1.0","type":"link"}