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IMPORTANT: Our store is located in Canada. All orders that include products manufactured outside of Canada or USA will be subject to tariffs and duties, regardless of the order value. US customers are responsible for all applicable duties and tariffs, and those will be billed by the carrier, except for the Lacerta upgrade kit, for which we collect them at checkout.
IMPORTANT: Our store is located in Canada. All orders that include products manufactured outside of Canada or USA will be subject to tariffs and duties, regardless of the order value. US customers are responsible for all applicable duties and tariffs, and those will be billed by the carrier, except for the Lacerta upgrade kit, for which we collect them at checkout.
SVBONY SV172 Dew Heater Strip 400mm for Telescopes and Cameras
SVBONY SV172 Dew Heater Strip 400mm
SVBONY SV172 Dew Heater Strip 400mm
SVBONY SV172 Dew Heater Strip 400mm
SVBONY SV172 Dew Heater Strip 400mm for Telescopes and Cameras

SVBONY SV172 Dew Heater Strip 400mm

by SVBONY
SKU SV-W9132C
$16.18 - $16.18
$16.18
$16.18 - $16.18
$16.18
Price Match Policy!
  • 400mm Length
  • Prevents Dew and Fog Formation
  • All-Weather Waterproof Construction
  • Low-Power, Consistent Heating
  • Simple Wrap-Around Installation
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Warranty

  • SVBONY SV172 Dew Heater Strip 400mm for Telescopes and Cameras

    The 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.

    All-Weather Dew Prevention for 400mm Circumference Optics

    Designed 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.

    Low-Power Heating for Consistent, Clear Views

    The 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.

    • Stable Optics: By warming the lens just enough to stay above the dew point, the strip avoids introducing thermal instability that can soften sharp focus.
    • Power Source (Not Included): 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.

    Choosing the Right Size: Why 400mm Matters

    Selecting 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.

    • Ideal For: 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).
    • Not Recommended For: 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.

  • How do I know if the SVBONY SV172 400mm dew heater is the right size for my telescope?

    To 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 400mm (approximately 15.7 inches) or slightly less, the SV172 is the correct size. It's ideal for instruments around 4-5 inches in diameter.

    What else do I need to use the SVBONY SV172 Dew Heater Strip?

    The SV172 is the heating element only. To operate it, you will need a dew controller (which allows you to adjust the heat level) and a 12V DC power source, such as a portable battery pack or AC adapter. These items are not included.

    Will the SVBONY SV172 heater strip damage my optics or lens coatings?

    No. 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.

    Can I use the SVBONY SV172 on my DSLR camera lens for nightscapes?

    Yes, 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.

    My 8" SCT has a circumference over 400mm. Can I still use the SVBONY SV172?

    While 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 finder scope, guide scope, or large 2-inch eyepieces, which are also susceptible to dewing up.

    How does the waterproof design of the SVBONY SV172 help during an observing session?

    The 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.

  • Length 400mm
    Model SV172

    • SV172 Dew Heater Strip (400mm)

      × 1

  • SVBONY Warranty Policy