Celestron 8-inch Dew Heater Ring

Key Features

• Direct heating of corrector glass
• Storage clips for power and thermistor jacks
• Cable management clip
• Power jack extension cable
• Paper installation shield

How it works

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 aluminium. Its rigid frame supports the cable circuitry and the telescope's Schmidt corrector lens.

Enhance your setup

To achieve the highest level of dew prevention while maximising power efficiency, we strongly recommend pairing the Dew Heater Ring with a Smart DewHeater Controller (sold separately).

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.

Power and battery

The ring runs from an external 12 V DC source and has no battery. It connects with a 12 V DC barrel connector, 5.5mm/2.1mm, tip positive, and has a maximum power of 20 W.

In stand-alone mode the heater ring always operates at its maximum power. A Smart DewHeater Controller (sold separately) is recommended to save power.

Fitting the ring

The ring permanently mounts to 8-inch Schmidt-Cassegrain, EdgeHD and RASA optical tubes, replacing the retaining ring.

The installation process is quick and easy (follow the manual or video for instructions).

Size and weight

The ring weighs 86.5 g (3.05 oz). Its inner diameter is 203.2 mm (8 inch) and its outer diameter is 225.6 mm.

What's in the box

• Dew Heater Ring
• Cable management clip
• Power jack extension cable, 6 ft long
• Paper installation shield

Why choose it

• Patented heater ring that heats the corrector lens directly
• Integrated thermistor that monitors corrector temperature, for use with Smart DewHeater Controllers
• Compatible with 8-inch Schmidt-Cassegrain, EdgeHD and RASA optical tubes
• Maximum power of 20 W from a 12 V DC input