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Prévention et contrôle de la buée

Dew ends more Canadian observing sessions than cloud does. A corrector plate or objective radiating heat to a clear sky drops below the dew point well before the air does, and once condensation forms on a large optic it will not clear on its own. David Astro carries dew prevention and control products in Canada — heater straps, controllers, shields and power distribution — held in stock for fast domestic shipping.

Prevention is straightforward and cheap; recovery is neither. Tell us your telescope aperture and where you observe and we will specify a system that keeps optics clear all night.

Filtres

$30.00 - $30.00
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$30.00 - $30.00
$30.00

Dew-Not Heater Bande chauffante - Oculaire 1.25"

DN002
2 restant!

Dew-Not™ est impliqué dans la conception et la fabrication d'éléments chauffants résistifs depuis plus de 30 ans. Leurs bandes chauffantes de rosé...

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$30.00 - $30.00
$30.00
$30.00 - $30.00
$30.00
Épuisé
$40.00 - $40.00
$40.00
$40.00 - $40.00
$40.00

Dew-Not Heater Bande chauffante - Télescope 4"

DN005

Dew-Not™ est impliqué dans la conception et la fabrication d'éléments chauffants résistifs depuis plus de 30 ans. Leurs bandes chauffantes de rosé...

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$40.00 - $40.00
$40.00
$40.00 - $40.00
$40.00
Épuisé
Épuisé
$44.00 - $44.00
$44.00
$44.00 - $44.00
$44.00

Dew-Not Heater Bande chauffante - Télescope 5"

DN006

Dew-Not™ est impliqué dans la conception et la fabrication d'éléments chauffants résistifs depuis plus de 30 ans. Leurs bandes chauffantes de rosé...

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$44.00 - $44.00
$44.00
$44.00 - $44.00
$44.00
Épuisé
Épuisé
$31.00 - $31.00
$31.00
$31.00 - $31.00
$31.00

Dew-Not Heater Bande chauffante - Oculaire 2"

DN003

Dew-Not™ est impliqué dans la conception et la fabrication d'éléments chauffants résistifs depuis plus de 30 ans. Leurs bandes chauffantes de rosé...

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$31.00 - $31.00
$31.00
$31.00 - $31.00
$31.00
Épuisé
Épuisé
$48.00 - $48.00
$48.00
$48.00 - $48.00
$48.00

Dew-Not Heater Bande chauffante - Télescope 6"

DN007

Dew-Not™ est impliqué dans la conception et la fabrication d'éléments chauffants résistifs depuis plus de 30 ans. Leurs bandes chauffantes de rosé...

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$48.00 - $48.00
$48.00
$48.00 - $48.00
$48.00
Épuisé
$51.00 - $51.00
$51.00
$51.00 - $51.00
$51.00

Dew-Not Heater Bande chauffante - Télescope 7"

DN008
3 restant!

Dew-Not™ est impliqué dans la conception et la fabrication d'éléments chauffants résistifs depuis plus de 30 ans. Leurs bandes chauffantes de rosé...

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$51.00 - $51.00
$51.00
$51.00 - $51.00
$51.00
Épuisé
$55.00 - $55.00
$55.00
$55.00 - $55.00
$55.00

Dew-Not Heater Bande chauffante - Télescope 8"

DN009

Dew-Not™ est impliqué dans la conception et la fabrication d'éléments chauffants résistifs depuis plus de 30 ans. Leurs bandes chauffantes de rosé...

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$55.00 - $55.00
$55.00
$55.00 - $55.00
$55.00
Épuisé
$59.00 - $59.00
$59.00
$59.00 - $59.00
$59.00

Dew-Not Heater Bande chauffante - Télescope 9"

DN010
5 restant!

Dew-Not™ est impliqué dans la conception et la fabrication d'éléments chauffants résistifs depuis plus de 30 ans. Leurs bandes chauffantes de rosé...

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

Dew-Not Heater Bande chauffante - Tête binoculaire

DN017
2 restant!

Dew-Not™ est impliqué dans la conception et la fabrication d'éléments chauffants résistifs depuis plus de 30 ans. Leurs bandes chauffantes de rosé...

Afficher tous les détails
$68.00 - $68.00
$68.00
$68.00 - $68.00
$68.00
$59.00 - $59.00
$59.00
$59.00 - $59.00
$59.00

Dew-Not Heater Bande chauffante - Raquette de commande

DN016
5 restant!

Dew-Not™ est impliqué dans la conception et la fabrication d'éléments chauffants résistifs depuis plus de 30 ans. Leurs bandes chauffantes de rosé...

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$59.00 - $59.00
$59.00
$59.00 - $59.00
$59.00
Épuisé
$32.00 - $32.00
$32.00
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$32.00

Dew-Not Heater Bande chauffante - Rigel Quick Fix

DNRQ

Dew-Not™ est impliqué dans la conception et la fabrication d'éléments chauffants résistifs depuis plus de 30 ans. Leurs bandes chauffantes de rosé...

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$32.00 - $32.00
$32.00
$32.00 - $32.00
$32.00
Épuisé
$43.00 - $43.00
$43.00
$43.00 - $43.00
$43.00

Dew-Not Heater Pare-buée chauffant pour Telrad

DN018
4 restant!

Dew-Not™ est impliqué dans la conception et la fabrication d'éléments chauffants résistifs depuis plus de 30 ans. Leurs bandes chauffantes de rosé...

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$43.00 - $43.00
$43.00
$43.00 - $43.00
$43.00
$52.80 - $52.80
$52.80
$52.80 - $52.80
$52.80

Farpoint Capuchon Déshydratant - 1.25"

FAP-FP326
2 restant!

L'humidité est une menace pour l'optique fine. Atténuez cette menace avec le capuchon déshydratant Farpoint de 1,25 pouce pour les télescopes à tu...

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$52.80 - $52.80
$52.80
$52.80 - $52.80
$52.80
$24.20 - $100.10
$24.20 - $100.10
$24.20 - $100.10
$24.20

Farpoint Pare-Buée Flexible - pour Celestron & Meade

Options available
4 variants in stock

Farpoint Dew Shield est une couverture pratiquement indestructible. Fixez simplement le couvercle flexible à l'avant du tube optique pour éviter l...

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$24.20 - $100.10
$24.20 - $100.10
$24.20 - $100.10
$24.20
Épuisé
$52.80 - $52.80
$52.80
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$52.80

Farpoint Paquets Déshydratants Réutilisables - Lot de 4

FAP-FP331

Farpoint Reusable Dry Pack - 4 Pack est un ensemble de quatre packs déshydratants rechargeables qui peuvent être stockés dans des étuis pour absor...

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$52.80 - $52.80
$52.80
$52.80 - $52.80
$52.80
Épuisé
Nanuk Reusable Desiccant Container
$14.12 - $14.12
$14.12
$14.12 - $14.12
$14.12

Nanuk Reusable Desiccant Container

NK-30-90016-K

Reusable desiccant canister for long-term moisture control Actively prevents rust, corrosion, mold, and mildew Ideal for protecting optics and ele...

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$14.12 - $14.12
$14.12
$14.12 - $14.12
$14.12
Orion Optics UK AG8 matching Carbon Fibre Dew Shield
$400.04 - $400.04
$400.04
$500.04
$500.04 - $500.04
$500.04

Orion Optics UK AG8 matching Carbon Fibre Dew Shield

OOUK-AG8-MATCHING-CARBON-FIBRE-DEW

Carbon fibre construction Slides directly onto the AG8 tube Reduces dew formation and stray light Description Specifications In the Box Warrant...

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$400.04 - $400.04
$400.04
$500.04
$500.04 - $500.04
$500.04
Orion Optics UK Carbon Dew Heater for 18″ ODK
$1,141.21 - $1,141.21
$1,141.21
$1,141.21 - $1,141.21
$1,141.21

Orion Optics UK Carbon Dew Heater for 18″ ODK

OOUK-TUBE-DEW-HEATER-ODK18TR-CARBON

Custom-designed for 18″ Orion Optics UK ODK Truss telescopes Lightweight and rigid carbon fiber construction Provides uniform heat to prevent dew ...

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$1,141.21 - $1,141.21
$1,141.21
$1,141.21 - $1,141.21
$1,141.21
Orion Optics UK Carbon Dew Heater for 20″ ODK
$1,545.36 - $1,545.36
$1,545.36
$1,545.36 - $1,545.36
$1,545.36

Orion Optics UK Carbon Dew Heater for 20″ ODK

OOUK-TUBE-DEW-HEATER-ODK20TR-CARBON

Custom-fit for Orion Optics UK 20" ODK Telescopes Prevents dew formation on primary mirror and corrector optics Lightweight and rigid carbon fiber...

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$1,545.36 - $1,545.36
$1,545.36
$1,545.36 - $1,545.36
$1,545.36
Orion Optics UK Carbon Dew Heater for 24″ Orion Optics UK Telescopes
$2,153.64 - $2,153.64
$2,153.64
$2,153.64 - $2,153.64
$2,153.64

Orion Optics UK Carbon Dew Heater for 24″ Orion Optics UK Telescopes

OOUK-TUBE-DEW-HEATER-ODK24TR-CARBON

Custom-fit for 24-inch Orion Optics UK ODK telescopes Rigid carbon fibre construction for uniform heat transfer Prevents dew formation on primary ...

Afficher tous les détails
$2,153.64 - $2,153.64
$2,153.64
$2,153.64 - $2,153.64
$2,153.64
Orion Optics UK Carbon Dew Heater for AG10/ODK10
$474.02 - $474.02
$474.02
$474.02 - $474.02
$474.02

Orion Optics UK Carbon Dew Heater for AG10/ODK10

OOUK-TUBE-DEW-HEATER-AG10-ODK10

Custom-designed for Orion Optics UK AG10 & ODK10 telescopes Lightweight and rigid carbon fibre construction Actively prevents dew formation on...

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$474.02 - $474.02
$474.02
$474.02 - $474.02
$474.02
Orion Optics UK Carbon Dew Heater for AG12/ODK12
$548.00 - $548.00
$548.00
$548.00 - $548.00
$548.00

Orion Optics UK Carbon Dew Heater for AG12/ODK12

OOUK-TUBE-DEW-HEATER-AG12-ODK12

Custom-designed for Orion Optics UK AG12 and ODK12 astrographs Lightweight, rigid carbon fibre construction Provides even heat distribution to pre...

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$548.00 - $548.00
$548.00
$548.00 - $548.00
$548.00
Orion Optics UK Carbon Dew Heater for AG14/ODK14
$621.98 - $621.98
$621.98
$721.98
$721.98 - $721.98
$721.98

Orion Optics UK Carbon Dew Heater for AG14/ODK14

OOUK-TUBE-DEW-HEATER-AG14-ODK14

Custom-fit for Orion Optics UK AG14 and ODK14 astrographs Rigid carbon fiber construction for durability and efficiency Ensures uniform heat distr...

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$621.98 - $621.98
$621.98
$721.98
$721.98 - $721.98
$721.98
Orion Optics UK Carbon Dew Heater for AG16/ODK16
$695.96 - $695.96
$695.96
$695.96 - $695.96
$695.96

Orion Optics UK Carbon Dew Heater for AG16/ODK16

OOUK-TUBE-DEW-HEATER-AG16-ODK16

Custom designed for Orion Optics UK AG16 and ODK16 astrographs Lightweight, rigid carbon fiber construction Provides even, gentle heat to prevent ...

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$695.96 - $695.96
$695.96
$695.96 - $695.96
$695.96

How Dew Forms and How to Stop It

An optic pointed at a clear sky radiates heat into space and cools below ambient air temperature. When it falls below the dew point, water condenses on it. The fix is to hold the glass a few degrees above ambient, not to heat it aggressively.

  • Heater straps: Resistive bands sized to specific apertures, wrapped near the objective or corrector to keep the glass just above dew point.
  • Dew controllers: Pulse-width controllers that regulate power rather than running heaters continuously, which saves battery and avoids introducing tube currents.
  • Dew shields: Extend the tube beyond the objective, reducing the sky area the optic radiates to. Passive, free to run, and often enough on their own for refractors.
  • Heated eyepiece and finder bands: Small straps for eyepieces, finders and guide scopes, which dew up as readily as the main optic and are often forgotten.
  • Power distribution: Dew heaters draw significant current, and a distribution box sized for the total load prevents voltage sag affecting the mount.
  • Desiccants: Control moisture inside stored equipment, where slow condensation cycling causes long-term damage.

Why Choose David Astro for Dew Control

We observe through Canadian humidity and Canadian cold, which are different problems requiring different amounts of power.

  • Power budgeted for the whole night: We total heater draw against your supply capacity, because a battery that runs the mount for eight hours may run mount plus heaters for three.
  • Sized to aperture: Strap length and wattage are matched to your specific optic. An undersized strap runs at full power and still loses; an oversized one wastes battery and can induce tube currents.
  • Controller recommended, not optional: Running heaters unregulated wastes power and can degrade seeing through the tube. We recommend a controller with any heater purchase.
  • Authorized dealer: Genuine products with manufacturer warranty, in Canadian stock.
  • Ships from Canada: No duties or brokerage fees on Canadian orders.

Dew Control in Canada — Frequently Asked Questions

Is a dew shield enough on its own?
Often for refractors, which have a recessed objective and can use a long shield. Schmidt-Cassegrains, with the corrector at the front, almost always need a heater as well.
How much power do dew heaters draw?
Enough to matter — a large strap can draw several amps at full output. A controller typically cuts average consumption substantially by pulsing rather than running continuously.
Can I use a hair dryer to clear dew?
It works but is a poor solution. Rapid heating creates tube currents that ruin seeing for a long time afterwards, and the dew returns within minutes. Prevention with a low-power heater is far better.
Do I need dew control in winter?
Yes, and frost is the winter version of the same problem. It forms by the same radiative cooling mechanism and is harder to remove without damaging coatings, so prevention matters more, not less.

Losing nights to dew?

Tell us your aperture and power setup and we will specify heaters, a controller and a shield. In Canadian stock, shipped worldwide.