The 9.25" Celestron Dew Heater Ring is a must-have accessory that will improve your observing or imaging nights year-round. The Dew Heater Ring will be permanently installed on the front of your Celestron 9.25" Schmidt-Cassegrain or EdgeHD OTA by replacing the corrector plate retaining ring that is already part of your telescope. This is much better than other dew heaters that need to be installed each time and can slip around; plus you can still use the telescope's dust cover when it is not in use.
The Dew Heater Ring replaces the plastic retaining ring on your Schmidt corrector lens for efficient heating across the lens. The ring is constructed of lightweight, durable aluminum. Its rigid frame supports the cable circuity and the telescope's Schmidt corrector lens. Unlike other heating bands or strips that inefficiently heat the lens cell to warm the glass, the Celestron Dew Heater Ring heats the corrector glass directly, providing the most efficient transfer of heat to prevent dew formation.
Simply plug the Celestron Dew Heater Ring into an external 12V DC power source like the PowerTank for consistent, continuous heat that will prevent dew from forming even under heavy dew conditions. To control the amount of heat applied to the corrector place, we recommend you purchase a Celestron Smart DewHeater Controller. The controller (sold separately) uses the ring's built-in thermistor and its internal environmental sensor to provide just the right amount of heat to the corrector to prevent dew based upon the ambient temperature, ambient humidity, and temperature of the Schmidt corrector, which can dramatically reduce the ring’s power draw, greatly increasing battery life. If you already have a third-party dew controller, there is an extension cable that will plug into it's heater output port, however the ring's thermistor only works with the Celestron Smart DewHeater Controller.
The Dew Heater Ring features two storage clips to keep the power and thermistor jacks secure when not in use. It also comes with a cable management clip that connects to the telescope's front cell. Corral the power and thermistor jack to prevent them from dangling and reduce unwanted pulls on the cable connection to the rings.
Included in the box:
- Dew Heater Ring
- Cable management clip
- Power jack extension cable
- Paper installation shield