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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.
Dew-Not Heater Strip - 50mm Guide Scope or 2" Eyepiece

Dew-Not Heater Strip - 50mm Guide Scope or 2" Eyepiece

by Dew-Not
SKU DN003
$31.00 - $31.00
$31.00
$31.00 - $31.00
$31.00
Price Match Policy!
  • 8" Active Heating Element Length
  • Designed for 2" Eyepieces and 50mm Guide Scopes
  • 4.2W Power Consumption
  • 0.35A Current Draw at 12V DC
  • 9.0" Total Strip Length
4 in stock
Qualifies for FREE Shipping in CONUS on orders over $350.
  • Description
  • FAQ
  • Specifications
  • In the Box
  • Warranty

  • Dew-Not Heater Strip - 50mm Guide Scope or 2" Eyepiece

    The Dew-Not DN003 heater strip delivers a continuous 4.2W of thermal power from a standard 12V DC source to prevent dew formation on 2" eyepieces and 50mm guide scopes. Its 8" heating element is sized for a precise fit, drawing a minimal 0.35A of current to keep your optics clear all night without significantly impacting your field battery's runtime.

    8-Inch Heating Element for 2" Eyepieces & 50mm Finders

    This heater's design centers on its 8" active heating element, contained within a total strip length of 9.0". This specific length ensures a snug, efficient wrap around the barrels of most 2" eyepieces and standard 50mm finderscopes or guide scopes. By applying gentle, continuous warmth directly to the optical housing, the DN003 strip prevents the glass surfaces from cooling below the dew point, ensuring your view remains clear and sharp even as temperatures drop.

    Efficient 4.2W Power Draw at 12V DC

    Operating on the standard 12V DC used by all astronomical power systems, the DN003 is engineered for efficiency. The 4.2W power rating translates to a low current draw of just 0.35A, placing a minimal load on your power tank. This allows you to run multiple heaters for your eyepiece, guide scope, and main telescope simultaneously without risking premature power loss during a long imaging session.

  • How do I install the Dew-Not DN003 heater on my 2" eyepiece?

    Installation is straightforward. Wrap the Dew-Not DN003 strip around the main barrel of your 2" eyepiece, typically just below the eyecup. The strip has a built-in elastic and Velcro attachment to hold it securely in place. Ensure it makes good contact with the eyepiece body for effective heat transfer, then plug the RCA-style connector into your dew controller.

    Will the 4.2W power of the Dew-Not DN003 be enough for very humid nights?

    Yes, for its intended targets. The 4.2W output is specifically calibrated for the small thermal mass of eyepieces and 50mm scopes. It provides enough heat to raise the optic's temperature a few degrees above ambient, which is all that is needed to prevent dew, even in high humidity. It is not designed for larger optics like a primary telescope objective.

    Can I plug the Dew-Not DN003 directly into a 12V battery?

    No, you should not. The Dew-Not DN003 heater is designed to be used with a dew controller. Plugging it directly into a 12V DC source would run it at 100% power continuously, which can be inefficient and unnecessary. A controller allows you to adjust the power output based on conditions, saving battery life.

    What is the difference between the 8" element length and 9.0" strip length on the DN003?

    The 8" Dew Strap Heater Element Length refers to the portion of the strip that actively produces heat. The total Strip Length of 9.0" includes the non-heating portions at the ends, which contain the Velcro and elastic for securing the strip to your equipment.

    I'm using a TeleVue 55mm Plössl on my SCT in Florida. Is the Dew-Not DN003 the right size?

    Yes, the Dew-Not DN003 is an excellent fit for large 2" eyepieces like the TeleVue 55mm Plössl. Its 8" heating element provides complete coverage around the eyepiece barrel, which is critical in the high-humidity environment of Florida to keep that large top element clear for wide-field views.

    Will the Dew-Not DN003 fit my 50mm ZWO guide scope for imaging the Orion Nebula (M42)?

    Absolutely. The Dew-Not DN003 is perfectly sized for standard 50mm guide scopes, including those from ZWO. Keeping the guide scope objective dew-free is critical for maintaining good guiding performance throughout a long imaging session on targets like the Orion Nebula (M42), and this strip's low 0.35A draw won't strain your power budget.

  • Known Fit 2" Eyepieces, 50mm Guide Scopes
    Heater Element Length 8"
    Total Strip Length 9.0" (229mm)
    Voltage 12V DC
    Power 4.2 W
    Current 0.35 A
    MPN DN003

    • Dew-Not Heater Strip (DN003)

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  • Dew-Not Warranty