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Dew-Not

Dew-Not heater strips take a different approach to dew prevention: a flat resistive element distributed across the whole strap rather than a coiled wire, which spreads heat evenly instead of creating hot lines. Even, gentle heating is exactly what you want, because localized heat creates the tube currents that soften an image. David Astro carries Dew-Not products in Canada, held in stock for fast domestic shipping.

Strap length is matched to your optic's circumference. Tell us your telescope, finder and guide scope and we will list the sizes you need.

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$32.00 USD - $32.00 USD
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Dew-Not Heater - Rigel QuikFinder

Made to fit the Rigel QuikFinder Operates on 12 V DC power 6 ft (1.83 m) power cord with standard RCA plug Thick-film heater construction Made in ...

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$32.00 USD - $32.00 USD
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$28.00 USD - $28.00 USD
$28.00 USD
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Dew-Not Heater Strip - .965" Eyepiece

Fits 0.965" eyepieces and finderscope eyepieces 4.5" (11.4 cm) strip length 2.1 W at 12V DC 0.18 A current draw 6 ft (1.83 m) power cord with RCA ...

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$30.00 USD - $30.00 USD
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Dew-Not Heater Strip - 1.25" Eyepiece

Fits 1.25" eyepieces and finderscope eyepieces Strip Length: 6.5" (16.5 cm) Power: 3.1 W at 12 V DC Current Draw: 0.25 A Power Cord: 6 ft with RCA...

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$62.00 USD - $62.00 USD
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Dew-Not Heater Strip - 10" Scope

Fits 10" telescopes 38.0" (96.5 cm) strip length 17.8 W power draw at 12 V DC Thick-film heater for even heat distribution 6 ft (1.83 m) power cor...

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$62.00 USD - $62.00 USD
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$65.00 USD - $65.00 USD
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Dew-Not Heater Strip - 11" Scope

Fits 11" Telescopes 40.0" (101.6 cm) Strip Length 18.8 W Power Output at 12 V DC Thick-Film Heater for Even Heat Distribution 6 ft (1.83 m) Power ...

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$65.00 USD - $65.00 USD
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$65.00 USD
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$68.00 USD - $68.00 USD
$68.00 USD
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$68.00 USD

Dew-Not Heater Strip - 12" Scope

Fits: 12" Telescopes Strip Length: 43.0" (109.2 cm) Power: 20.2 W at 12 V DC Current Draw: 1.68 A Made in: USA Description FAQ Specifications I...

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$68.00 USD - $68.00 USD
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Dew-Not Heater Strip - 14" Scope

Fits 14" Telescopes Strip Length: 49.0" (124.5 cm) Power: 23.0 W at 12 V DC Current Draw: 1.92 A Connection: 6 ft cord with RCA plug Descriptio...

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$70.00 USD - $70.00 USD
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$77.00 USD - $77.00 USD
$77.00 USD
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$77.00 USD

Dew-Not Heater Strip - 16" Scope

Fits 16" Telescopes 55.0" (139.7 cm) Strip Length 25.8 W Power at 12 V DC Current Draw: 2.15 A Thick-Film Heater for Even Heat Distribution Made i...

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$77.00 USD - $77.00 USD
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$34.00 USD - $34.00 USD
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Dew-Not Heater Strip - 3" Scope

Fits 3" Telescopes 13.0" (33.0 cm) Strip Length 6 W Power Consumption at 12 V DC Efficient Thick-Film Heater Technology 6 ft (1.83 m) Power Cord w...

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$34.00 USD - $34.00 USD
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$40.00 USD - $40.00 USD
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Dew-Not Heater Strip - 4" Scope

Fits 4" Telescopes 15.4" (39 cm) Strip Length 7.3W Power Draw at 12V Thick-Film Heater Technology 6 ft (1.83 m) Cord with RCA Plug Description ...

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$40.00 USD - $40.00 USD
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$44.00 USD - $44.00 USD
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Dew-Not Heater Strip - 5" Scope

Fits 5" telescopes 16.75" (42.5 cm) strip length 7.9 W power draw at 12 V DC Thick-film heater for even heat distribution 6 ft (1.83 m) power cord...

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$44.00 USD - $44.00 USD
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$31.00 USD - $31.00 USD
$31.00 USD
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$31.00 USD

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

Fits most 2" eyepieces and 50mm finder/guide scopes 9.0" (229 mm) strip length Draws 0.35A (4.2W) at 12V DC 6 ft (1.83 m) power cord with RCA plug...

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$31.00 USD - $31.00 USD
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$48.00 USD - $48.00 USD
$48.00 USD
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$48.00 USD

Dew-Not Heater Strip - 6" Scope

Designed for 6" telescopes 20.5" (52.1 cm) strip length 9.6 W power draw at 12 V DC Thick-film heater for even heat distribution 6 ft (1.83 m) pow...

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$48.00 USD - $48.00 USD
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$51.00 USD - $51.00 USD
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Dew-Not Heater Strip - 7" Scope

Fits 7" Telescopes Strip Length: 25.0" (63.5 cm) Power: 11.8 W at 12 V DC Current Draw: 0.98 A Power Cord: 6 ft with RCA plug Made in the USA D...

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$51.00 USD - $51.00 USD
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$55.00 USD - $55.00 USD
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Dew-Not Heater Strip - 8" Scope

Designed for 8" telescopes 30.0" (76.2 cm) strip length 14 W power output at 12 V DC 1.18 A current draw 6 ft (1.83 m) power cord with RCA plug Ma...

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$55.00 USD - $55.00 USD
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$55.00 USD
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$59.00 USD - $59.00 USD
$59.00 USD
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$59.00 USD

Dew-Not Heater Strip - 9" Scope

Fits 9" Telescopes 33.0" (83.8 cm) Strip Length 15.5 W Power at 12 V DC 1.30 A Current Draw 6 ft (1.83 m) Power Cord with RCA Plug Description ...

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$59.00 USD - $59.00 USD
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$59.00 USD
$68.00 USD - $68.00 USD
$68.00 USD
$68.00 USD - $68.00 USD
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Dew-Not Heater Strip - Binoviewer

Designed for Binoviewers (one heater per eyepiece) Strip Length: 6.0" (15.2 cm) each Power: 5.6 W at 12 V DC Current Draw: 0.47 A Power Cord: 6 ft...

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$68.00 USD - $68.00 USD
$68.00 USD
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$68.00 USD
$59.00 USD - $59.00 USD
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$59.00 USD - $59.00 USD
$59.00 USD

Dew-Not Heater Strip - Hand Controller

Fits standard hand-held telescope controllers Strip Length: 4.5" (11.4 cm) Power: 2.5 W Voltage: 12 V DC Power Cord: 6 ft (1.83 m) with RCA plug M...

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$59.00 USD - $59.00 USD
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$43.00 USD - $43.00 USD
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Dew-Not Heater Strip - Telrad Heated Shield

Heated dew shield specifically for Telrad finders 1.44 W at 12 V DC Thick-film heater construction for even heat distribution 6 ft (1.83 m...

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$43.00 USD - $43.00 USD
$43.00 USD
$43.00 USD - $43.00 USD
$43.00 USD

Even Heating and Why It Matters

A dew heater has to raise the glass a few degrees above the dew point without creating a temperature gradient inside the tube.

  • Flat distributed elements: Heat spread across the strap's whole area rather than concentrated along a wire, which reduces localized hot spots.
  • Length matched to circumference: The strap should encircle the tube near the objective or corrector without excessive overlap, which wastes power.
  • Sizes across the whole rig: Straps for main optics, guide scopes, finders and eyepieces, since each dews independently and often the small ones go first.
  • Standard connectors: RCA connections compatible with common dew controllers, so the straps integrate with whatever controller you use.
  • Controller pairing: Designed to be run through a pulse-width controller rather than at full power, which cuts consumption substantially.
  • Cold-weather durability: Construction intended to remain flexible and intact through repeated freeze cycles.

Why Choose David Astro for Dew-Not

Heater selection is a sizing exercise and a power budgeting exercise, and both are quick to do properly.

  • Sized to actual circumference: We calculate strap length from your tube's outer diameter including a dew shield if the strap sits over it.
  • Whole-rig coverage: We count every optic that dews — main scope, guide scope, finder — so you are not adding straps one at a time across a season.
  • Power totalled: We add the full set's draw to your other loads so your battery lasts the night.
  • Authorized dealer: Genuine products with manufacturer warranty, in Canadian stock.
  • Ships from Canada: No duties or brokerage fees for Canadian orders.

Dew-Not in Canada — Frequently Asked Questions

Why does even heating matter?
Concentrated heat creates convection currents inside the tube that blur detail. A strap that distributes heat evenly at low power keeps the optic clear without degrading the view.
What length strap do I need?
Enough to encircle the tube at the point where it will sit, with a small overlap. Measure the outer diameter and multiply by pi, or tell us the telescope model and we will size it.
Do I need a controller?
Strongly recommended. Running straps at full power wastes battery and risks tube currents. A pulse-width controller holds the optic just above dew point and cuts consumption considerably.
Can I use these on a corrector plate?
Yes, and Schmidt-Cassegrains particularly need them since the corrector sits exposed at the front. Place the strap on the tube just behind the corrector cell.

Sizing heater straps?

Tell us every optic on your rig and we will list the sizes and total the power. Canadian stock, worldwide shipping.