Collection: Dew Heaters

Dew Heaters for Telescopes & Astrophotography 

Dew can end an imaging session fast—especially as temperatures drop toward the dew point. Starfield DH Series dew heaters are built to help keep your optics clear through long nights, with rugged straps, cold-weather-ready silicone cables, and practical sizing for common telescope and accessory diameters.

Based in Toronto, Ontario, Starfield Optics supports astronomers with dew control solutions for refractors, Newtonians, guide scopes, and eyepieces.

Quick Picks

• Starfield SF-DC4 Dew Controller — control heater output for changing conditions
• ASIAIR Pro heater connector — easy way to run a small heater from ASIAIR 12V outputs
• DH-3 USB Dew Heater — convenient USB power option (no dew controller required)

Choose the Right Dew Heater Size

Strap sizes are listed by typical telescope/accessory class, but the best way to choose is to measure the circumference where the strap will mount (near the optics).

Newtonian Secondary Mirror Heaters

For Newtonians, a secondary heater can be a clean, low-power way to prevent secondary dew (with compatibility for common controller systems).

• Newtonian Secondary heater – Small (1.25" stalks)
• Newtonian Secondary heater – Large (2" stalks)

Dew Control FAQ

Do I need a dew controller?

Most 12V straps are best used with a controller so you can match heater output to conditions and conserve power. USB models can be a simple option when you want convenience and minimal gear.

Where do I mount the dew heater?

For refractors and SCTs, mount the strap near the front of the optical tube (close to the objective/corrector). For eyepieces, wrap it around the barrel or grip area.

What size should I buy?

Use the table above, but always measure the circumference where the strap will sit before ordering.