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Because of this, when operating at full power in stand-alone mode, there may be some slight degradation of optical performance for the 11” and 14” models under certain conditions. However, on the 11” and 14” models, quite a bit of heat is required to keep dew from forming near the center of the Schmidt corrector around the secondary mirror under heavy dew conditions. For smaller telescopes, this does not have a significant effect on optical performance, since not much heat is needed to keep the glass dew-free.

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When used in “stand-alone” mode, the heater ring always operates at this maximum power, so the corrector will stay free from dew under virtually all environmental conditions. While not mandatory, a shield will cut down on the amount of power the Dew Heater Ring needs to keep the optics clear.įor each of the Dew Heater Rings, we determined the amount of power required to heat the Schmidt corrector to keep it clear under very heavy dew conditions and engineered the circuitry accordingly. We also recommend adding a dew shield to your setup. (Note: the ring’s integrated thermistor is only compatible with the Celestron Smart DewHeater Controllers). The ring also includes an extension cable for connecting the ring directly to one of the controllers’ heater output ports, or to a third-party controller’s heater output port. The controller 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. To achieve the highest level of dew prevention while maximizing power efficiency, we strongly recommend pairing the Dew Heater Ring with a Smart DewHeater Controller (sold separately). Corral the power and thermistor jack to prevent them from dangling and reduce unwanted pulls on the cable connection to the rings. The Dew Heater Ring also comes with a cable management clip that connects to the telescope's front cell. The Dew Heater Ring features two storage clips to keep the power and thermistor jacks secure when not in use while accommodating the telescope's dust cover. Simply plug the ring into an external 12V DC power source for consistent, continuous heat that will prevent dew from forming even under heavy dew conditions. 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. Its rigid frame supports the cable circuity and the telescope's Schmidt corrector lens. The ring is constructed of lightweight, durable aluminum.

The Dew Heater Ring replaces the plastic retaining ring on your Schmidt corrector lens for efficient heating across the lens.

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The installation process is quick and easy (follow the manual for instructions). The Dew Heater Ring permanently mounts to your 11' Celestron Schmidt-Cassegrain (manufactured 2006 or later), EdgeHD, and RASA optical tube, replacing your retaining ring so you'll never be caught without it.

This must-have accessory will improve your observing or imaging nights year-round. The Celestron Dew Heater Ring is the ideal dew prevention solution for your Celestron telescope.

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