Pegasus Astro Multi-Channel Dew Controller — image 1
Pegasus Astro

Pegasus Astro Multi-Channel Dew Controller

4-channel · 12 V

Keeps a gentle, adjustable warmth on your optics all night so dew never forms, and never fogs you out mid-session.

89/ 100
Polaris Score
#1 of 9 dew-control accessories we recommend
From$259.90
Where to buy
Affiliate link — we earn a commission, you pay the same. We rank on fit, not payout.
What problem does this solve?

Dew ends more observing nights than clouds do.

As the ground cools after sunset, exposed glass radiates heat to the sky and drops below the dew point. Moisture condenses straight onto your corrector plate, finder, or eyepiece, the image softens, then vanishes. By the time you notice, the night is usually over.

A heater controller feeds low, regulated power to heater straps wrapped around each optic, holding the glass a few degrees above ambient. Just enough to stop condensation, not enough to cause the tube currents that blur the view.

You need one if
You need one if you observe or image for more than an hour, live somewhere humid, or have ever watched a target slowly fog away for no obvious reason.
You can skip it if
You can skip it for short grab-and-go sessions in dry air, or if a dew shield alone already gets you through the night.
01Will it fit my setup

Compatibility.

What this accessory works with — check the fit before you check the price.

What this accessory works with — check the fit before you check the price.

SCTNewtonianRefractorMaksutov12 V powerRCA strapsAny aperture
Note✕Not USB-powered✕Straps sold separately
02The numbers

What These Numbers Mean

4 numbers in plain English · full specifications

4 numbers in plain English · full specifications

What it solvesSession saver
Dew on optics
Glass radiates heat to the sky and falls below the dew point, and once the corrector or objective fogs the night is over. A heater band held a couple of degrees above ambient prevents that from ever starting.
ChannelsWhole rig
Multiple independent outputs
One controller runs bands on the main telescope, the guide scope and the finder at different power levels, because a small finder needs far less heat than an eight-inch corrector. Running everything from one dumb output wastes power and over-heats the small optics.
ControlAutomatic
PWM with ambient sensing
It measures temperature and humidity and applies only as much power as conditions need, rather than running flat out all night. That matters because dew heaters are usually the largest draw on a portable power supply.
PowerPlan capacity
12 V DC input
It shares the same 12 volt supply as your mount, and heaters are power hungry. Size your battery for the mount plus heaters together, or you will run out mid-session on the coldest, clearest nights.
Electrical
Input12 V DC
Channels4 · independently dialed
OutputPWM · 0–100% per channel
ConnectorsRCA (standard strap fit)
ControlOn-unit dials / app
Physical
HousingAnodised aluminium
DisplayPer-channel indicator
MountingVelcro / tripod strap
SensorsAmbient + humidity
03Before you buy

Good to know.

The honest caveats — the things that save you a return, a bad first night, or a second purchase you didn't need.

The honest caveats — the things that save you a return, a bad first night, or a second purchase you didn't need.

It warms optics, it does not power your mount.
Run the controller off the same 12 V battery as your mount if you like, but budget the amps: heater straps can pull as much as a slewing mount.
A dew shield delays dew; this prevents it.
The two work best together, the shield reduces how much power the straps need, so your battery lasts longer.
Start low.
Run each channel at the lowest setting that keeps glass clear. Over-heating introduces tube currents that soften the image more than light dew would.
89/ 100
Pegasus Astro Multi-Channel Dew Controller
4-channel · 12 V · $259.90

Keeps a gentle, adjustable warmth on your optics all night so dew never forms, and never fogs you out mid-session.