Astrozap Dew Heater – 4" Objective Telescopes (AZ-704) An Astrozap dew heater strap for telescopes with 4" objectives. It warms the optics slightly above ambient temperature to stop dew forming during an observing session.
Manufacturer model: Astrozap AZ-704 · Specifications checked against manufacturer data on 2026-11-03
An Astrozap dew heater strap for telescopes with 4" objectives. It warms the optics slightly above ambient temperature to stop dew forming during an observing session.
The heater needs an Astrozap D/C adapter (AZ-719) or the Astrozap dual-channel dew controller (AZ-720) to be powered; neither is included.
| Model | AZ-704 |
|---|---|
| Fits | telescopes with 4" objectives |
| Heater length | 15" (381 mm) |
| Power | 6.2 W at 12 V |
| Current | 0.52 A |
| Power source | AZ-719 D/C adapter or AZ-720 controller (sold separately) |
AZ-704. Requires AZ-719 or AZ-720 (not included).
Data sheet
Astrozap Dew Heater – 4" Objective Telescopes (AZ-704) An Astrozap dew heater strap for telescopes with 4" objectives. It warms the optics slightly above ambient temperature to stop dew forming during an observing session.
Manufacturer model: Astrozap AZ-704 · Specifications checked against manufacturer data on 2026-11-03
