{"product_id":"svbony-sv172-dew-heater-strip-400mm","title":"SVBONY SV172 Dew Heater Strip 400mm","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e400mm Length\u003c\/li\u003e\n\u003cli\u003ePrevents Dew and Fog Formation\u003c\/li\u003e\n\u003cli\u003eAll-Weather Waterproof Construction\u003c\/li\u003e\n\u003cli\u003eLow-Power, Consistent Heating\u003c\/li\u003e\n\u003cli\u003eSimple Wrap-Around Installation\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\u003eSVBONY SV172 Dew Heater Strip 400mm for Telescopes and Cameras\u003c\/h2\u003e\n\u003cp\u003eThe SVBONY SV172 Dew Heater Strip provides 400mm of consistent, low-power heating to keep telescope objectives, corrector plates, and camera lenses free from vision-impairing dew. By gently warming the glass above the dew point, it ensures your optics remain clear and fog-free throughout long nights of observation or imaging, even in damp 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\u003eAll-Weather Dew Prevention for 400mm Circumference Optics\u003c\/h3\u003e\n\u003cp\u003eDesigned for reliable operation in the field, the SV172 dew heater is built with high-quality, waterproof materials that withstand harsh outdoor conditions. Its 400mm length is ideal for optical tubes with a circumference up to 400mm, which corresponds to telescopes with an aperture of approximately 127mm (5 inches) or smaller, as well as large telephoto camera lenses.\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\u003eLow-Power Heating for Consistent, Clear Views\u003c\/h3\u003e\n\u003cp\u003eThe SV172 is engineered to apply gentle, continuous heat, which is critical for maintaining optical quality. This low-power approach prevents the formation of tube currents or heat plumes that can distort high-magnification views of planets and double stars. It also ensures efficient energy use, helping to conserve your field battery during extended sessions.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStable Optics:\u003c\/strong\u003e By warming the lens just enough to stay above the dew point, the strip avoids introducing thermal instability that can soften sharp focus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Source (Not Included):\u003c\/strong\u003e This dew heater strip requires a separate dew controller and a 12V DC power source to function, allowing you to regulate the heat output based on ambient temperature and humidity.\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\u003eChoosing the Right Size: Why 400mm Matters\u003c\/h3\u003e\n\u003cp\u003eSelecting the correct dew heater length is crucial for effective dew prevention. The 400mm SV172 is a versatile size that fits a wide range of popular instruments. To confirm fit, simply wrap a flexible measuring tape around your optical tube or lens barrel where you intend to place the heater.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIdeal For:\u003c\/strong\u003e 4\" to 5\" refractors, 5\" Schmidt-Cassegrain or Maksutov-Cassegrain corrector plates, and large telephoto lenses (e.g., 300mm f\/2.8, 400mm f\/4).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot Recommended For:\u003c\/strong\u003e Larger telescopes like 8\" or 10\" SCTs, which require a longer strip to cover their larger circumference. For these, the SV172 can be effectively used on finder scopes or large 2\" eyepieces.\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\"\u003eHow do I know if the SVBONY SV172 400mm dew heater is the right size for my telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eTo ensure a proper fit, measure the circumference of your telescope's optical tube or camera lens where the strip will be placed. If the measurement is \u003cstrong\u003e400mm (approximately 15.7 inches) or slightly less\u003c\/strong\u003e, the SV172 is the correct size. It's ideal for instruments around 4-5 inches in diameter.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat else do I need to use the SVBONY SV172 Dew Heater Strip?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe SV172 is the heating element only. To operate it, you will need a \u003cstrong\u003edew controller\u003c\/strong\u003e (which allows you to adjust the heat level) and a \u003cstrong\u003e12V DC power source\u003c\/strong\u003e, such as a portable battery pack or AC adapter. These items are not included.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the SVBONY SV172 heater strip damage my optics or lens coatings?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. The heater is designed for low-power operation that gently warms the lens just a few degrees above the ambient temperature. This is well within the safe operating range for all telescope and camera lens coatings and will not cause any damage.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the SVBONY SV172 on my DSLR camera lens for nightscapes?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, absolutely. The 400mm length is perfect for larger professional telephoto or zoom lenses used for astrophotography. It will prevent the front element from fogging up during long exposures, which is a common problem on damp nights.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eMy 8\" SCT has a circumference over 400mm. Can I still use the SVBONY SV172?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile the SV172 is too short for the main optical tube of an 8\" SCT, it is an excellent size for accessories on that scope. You can use it to prevent dew on your \u003cstrong\u003efinder scope, guide scope, or large 2-inch eyepieces\u003c\/strong\u003e, which are also susceptible to dewing up.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the waterproof design of the SVBONY SV172 help during an observing session?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe waterproof construction ensures that heavy dew, frost, or even light rain will not damage the heater strip or cause an electrical short. This provides peace of mind and reliable dew prevention no matter how damp the observing conditions become.\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\u003eLength\u003c\/td\u003e\n\u003ctd\u003e400mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eSV172\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\"\u003eSV172 Dew Heater Strip (400mm)\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\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/svbony-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eSVBONY Warranty Policy\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SVBONY","offers":[{"title":"Default Title","offer_id":52861264593181,"sku":"SV-W9132C","price":23.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-SV172-Dew-Heater-Strip-400mm-for-Telescopes-and-Cameras-1_71850237-c7be-46f7-bb39-be7dc3ca9ccc.jpg?v=1788660748","url":"https:\/\/davidastro.com\/products\/svbony-sv172-dew-heater-strip-400mm","provider":"David Astro","version":"1.0","type":"link"}