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Aluminium dew heater ring for 5 inch Schmidt-Cassegrain telescope

Celestron

Celestron 5" Dew Heater Ring 12V optic

SKU CH-MSJF-3CTM3

Prevents dew on 5" Schmidt-Cassegrain telescopes with a 12 V aluminium ring that heats the corrector lens directly

  • Prevents dew on 5" Schmidt-Cassegrain telescopes for uninterrupted viewing
  • 7-watt heating element stops moisture without affecting optical performance
  • Aluminum construction distributes heat evenly across the corrector lens
  • Replaces retaining ring for permanent, tool-free mounting on the tube
  • Two storage clips secure power and thermistor jacks when not in use

5" Dew Heater Ring for Schmidt-Cassegrain

The Celestron 5" Dew Heater Ring mounts directly onto the Schmidt corrector lens of a compatible 5" Schmidt-Cassegrain telescope, replacing the standard retaining ring. It is designed for astronomers who need reliable dew prevention during long observing or imaging sessions throughout the year.

Direct glass heating at 7 watts

The aluminium ring heats the corrector glass directly rather than warming the lens cell indirectly, delivering efficient heat transfer at 7 watts when connected to a 12V DC power source. This sustained output maintains consistent lens clarity even under heavy dew conditions without affecting optical performance.

Replaces the plastic retaining ring

Installation swaps the factory plastic retaining ring for this rigid aluminium frame, which also supports the Schmidt corrector lens and cable circuitry. The upgrade is worthwhile for observers who frequently battle dew and want a permanent, low-profile solution with integrated storage clips for the power and thermistor jacks.

How it compares

Measured against everything we stock in Binoculars, Scopes & Sights, at today’s prices. Recalculated every night.

Price $23.99
Cheaper than about 82% of the 1,401 comparable items (median $93.99).

Specifications

No published specifications for this item yet.

Questions about this item

How much heat does the 7-watt ring add to the tube during an all-night session?

The aluminum ring operates at 7 watts on 12V DC, warming the corrector glass directly rather than the cell, so the tube stays only slightly above ambient temperature.

What power source must I already have to run this heater?

You need an external 12V DC supply — such as a regulated power tank or a car-socket adapter — because the ring has no internal battery and plugs straight into that source.

Will the ring fit my older 5" Schmidt-Cassegrain if I keep the original retaining ring?

The heater replaces the factory plastic retaining ring on the Schmidt corrector lens, so the original ring is removed during installation and the dew heater becomes the new retainer.

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