Celestron 5-inch Dew Heater Ring (Part #94055)
Low-profile, high-efficiency dew control for Celestron 5″ Schmidt-Cassegrain telescopes
If you rely on a 5-inch SCT for visual observing, grab-and-go imaging, or EAA, you already know what it does best: compact performance with surprising reach. But like all Schmidt-Cassegrains, its corrector plate is prone to dew—especially on cool, humid nights. The Celestron Dew Heater Ring for 5" scopes gives you a permanent, elegant solution that targets the dew problem at its source: the corrector glass itself.
This lightweight, ultra-efficient heating ring installs once, stays in place, and works with your favorite 12V power system. And when paired with Celestron’s Smart DewHeater Controller, it becomes part of a fully automated dew-fighting strategy.
Why it works better
The heater ring replaces your stock corrector plate retaining ring with a precision-machined, velvet-lined aluminum frame that houses a direct-contact resistive heater. That means no more wrapping bands around the tube and hoping the heat eventually reaches the glass—this heater delivers warmth exactly where dew forms, and nowhere else.
An integrated thermistor sensor allows Celestron Smart Controllers to dynamically regulate output based on ambient temperature, humidity, and the actual temperature of your corrector plate. The result? Maximum clarity with minimum power draw.
-
Direct-glass heating ensures maximum efficiency and effectiveness
-
Built-in thermistor supports real-time sensor-driven regulation (Smart Controller required)
-
Two cable clips keep jacks protected and out of the way when not in use
-
Cable management clip attaches to your OTA’s front cell for clean routing
-
Works with your telescope's original dust cover
Installation: Set it and forget it
Compatible with Celestron 5″ SCTs manufactured in 2006 or later (look for the trilobed rear cell design), this ring is a direct replacement for the factory retaining ring. Use the included paper installation shield to protect the corrector during installation. Once installed, the Dew Heater Ring becomes a permanent part of your optical tube—no more fumbling with straps in the dark or worrying about whether you remembered to pack your heater.
Technical Specs
| Feature |
Specification |
| Max Power |
7 watts @ 12V DC |
| Power Connector |
5.5mm × 2.1mm barrel jack, tip positive |
| Thermistor Jack |
2.5mm audio plug (Smart DewHeater Controller compatible) |
| Extension Cable |
6″ RCA to barrel plug |
| Construction |
Lightweight aluminum with velvet-lined interior |
| Compatibility |
Celestron 5″ SCTs (2006 and newer) |
| Inner Diameter |
127.3 mm (5.01″) |
| Outer Diameter |
146.0 mm (5.75″) |
| Weight |
1.63 oz (46.3 g) |
Note: While the ring's heater function works with most 12V dew controllers, the internal thermistor only functions with Celestron Smart Controllers.
Observing Tip
The smaller the aperture, the faster the corrector cools—and the sooner dew becomes a problem. Pairing this heater ring with a dew shield reduces radiant heat loss, lowers power consumption, and keeps your optics dry without drawing down your battery too quickly.
Final Thoughts
If your 5" SCT is a regular part of your astronomy routine, the Celestron Dew Heater Ring is the perfect low-profile upgrade. It’s smarter, more efficient, and more elegant than a clunky strap—and it disappears into your scope like it was meant to be there from day one.
Newer generation Celestron SCTs built in the year 2006 or later are compatible with the Dew Heater Ring. These newer OTAs have a trilobed shape on the rear cell. In addition, newer generation 14" SCTs have a rounded rear cell. See photo examples below. All EdgeHD, RASA, 6” Schmidt-Cassegrain and 9.25” Schmidt-Cassegrain telescopes are compatible with the Dew Heater Ring.
