{"product_id":"svbony-sv172-usb-dew-heater-strip-240mm-320mm-400mm","title":"SVBONY SV172 USB Dew Heater Strip (240mm \/ 320mm \/ 400mm)","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385873580379129561241302.jpg?v=1791667879\" alt=\"SVBONY SV172 USB dew heater strip key visual\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe SVBONY SV172 is a USB-powered dew heater strip that wraps around a telescope dew shield, objective cell or camera lens and keeps the front optic a few degrees above the dew point. It runs from 5V on a USB Type-A plug, is 50 mm wide, and has a three-level heat regulator. This listing offers three heater lengths — 240 mm, 320 mm and 400 mm — drawing 7.25–7.75 W, 9–9.25 W and 9.5–9.75 W respectively, each on a 1.8 m nylon-braided power cable.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385873582249460235580739.jpg?v=1791667879\" alt=\"SVBONY SV172 dew heater strip feature overview\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385873584601396784965436.jpg?v=1791667878\" alt=\"SVBONY SV172 dew heater strip features and design\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you observe or image with a small to mid-size refractor or a camera lens on nights when dew forms, and want a heater that runs from a USB power bank, USB hub or power box without a separate controller.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e5V USB power:\u003c\/strong\u003e runs from a USB Type-A port on a power bank, power box or hub.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThree heat levels:\u003c\/strong\u003e strong, medium and weak settings on the inline regulator.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e50 mm width:\u003c\/strong\u003e narrow enough to sit behind the front optic without intruding into the light path or causing vignetting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLayered construction:\u003c\/strong\u003e imitation OK cloth, SBR, Black-T, aluminium film and PU layers spread heat evenly and hold it against the tube.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlloy fibre heating wire with silicone insulation:\u003c\/strong\u003e fast, continuous warming with insulation against internal shorts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.8 m nylon power cable:\u003c\/strong\u003e enough reach from the telescope to a mount-mounted power source.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385873585598942285020782.jpg?v=1791667879\" alt=\"SVBONY SV172 dew heater strip layered construction\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385873588089023027252244.jpg?v=1791667879\" alt=\"SVBONY SV172 dew heater strip three-level heat regulator\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eChoosing a Length\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe heater length is the heated section that wraps the optic; the total length adds the strap ends. SVBONY lists these fits for its own telescopes:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e240 mm (W9132A):\u003c\/strong\u003e total length 320 mm, 1.45–1.55 A. Sized for camera lenses and compact optics.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e320 mm (W9132B):\u003c\/strong\u003e total length 400 mm, 1.8–1.95 A. SVBONY lists it for the SV503 70ED.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e400 mm (W9132C):\u003c\/strong\u003e total length 480 mm, 1.9–2.2 A. SVBONY lists it for the SV48P 90, SV503 80ED and SV550 80APO.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eFor other telescopes, measure the circumference where the strip will sit and compare it with the heater length. Send us the measurement and we will help you pick the right size.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6386460961147008016980763.jpg?v=1791667879\" alt=\"SVBONY SV172 dew heater strip 240mm, 320mm and 400mm length options\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRefractor dew prevention:\u003c\/strong\u003e keeps the objective clear through long imaging sessions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCamera lenses:\u003c\/strong\u003e wide-field and Milky Way imaging with DSLR or mirrorless lenses.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGuide scopes and finders:\u003c\/strong\u003e the shorter strip suits smaller tubes.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385873595320571498871201.jpg?v=1791667879\" alt=\"SVBONY SV172 dew heater strip on telescope and camera lens\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower source:\u003c\/strong\u003e any USB Type-A port able to supply the listed current — up to 2.2 A for the 400 mm strip. A USB power bank or a powered USB port on a power box covers this.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLarger telescopes:\u003c\/strong\u003e SVBONY offers the SV172 430mm PWM strip and the 12V SV192 for larger tubes.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385873596609512076956267.jpg?v=1791667879\" alt=\"SVBONY SV172 dew heater strip compatibility and specifications\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385873592057677726239389.jpg?v=1791667879\" alt=\"SVBONY SV172 dew heater strip usage and compatibility\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6384593884511263513318599.webp?v=1791665047\" alt=\"SVBONY SV172 dew heater strip comparison chart of 240mm, 320mm, 400mm and 430mm PWM versions\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eUSB current:\u003c\/strong\u003e some computer USB ports supply less than the strip draws; a power bank or a power box USB port rated at 2A or more runs it at full output.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eController:\u003c\/strong\u003e heat is set with the three-level inline regulator; this strip has no PWM input for automatic controllers.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. Wrap the strip around the dew shield or lens barrel just behind the front optic, fasten the strap, plug it into a USB port and pick a heat level.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich length do I need?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eMatch the heater length to the circumference of your dew shield or lens. SVBONY lists the 320 mm for the SV503 70ED and the 400 mm for the SV48P 90, SV503 80ED and SV550 80APO.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan it run from a power bank?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes. It plugs into a standard USB Type-A port.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill it work on a camera lens?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes. SVBONY lists it as compatible with DSLR camera lenses.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 50 mm wide, 5V USB dew heater strip in three heater lengths with a three-level regulator, for keeping refractors, guide scopes and camera lenses clear of dew.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"240mm","offer_id":67721422602351,"sku":"W9132A","price":23.0,"currency_code":"CAD","in_stock":true},{"title":"320mm","offer_id":67721422635119,"sku":"W9132B","price":24.21,"currency_code":"CAD","in_stock":true},{"title":"400mm","offer_id":67721422667887,"sku":"W9132C","price":23.06,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/1_20250806104316_4178_20260820163541_0262.webp?v=1791665177","url":"https:\/\/ontariotelescope.com\/products\/svbony-sv172-usb-dew-heater-strip-240mm-320mm-400mm","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}