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Astro Systems Secondary Dew Guard For 1.3" to 2.14" Secondary Mirrors - DG1

SKU: AST-DG1
 

AstroSystems Dew Guard For 1.3" to 2.14" Secondary

This AstroSystems Dew Guard For 1.3" to 2.14" Secondary is an automatic electric heating accessory for Newtonian telescope secondary mirrors with size from 1.3" to 2.14".

AstroSystems amazing Dew Guard secondary mirror heating system automatically senses the air temperature and the mirror temperature then maintains the secondary at a preset (adjustable) temperature above the ambient air temperature. Gently warms the secondary at 2-4 watts when on full. The DG-1 has 4, The DG-2 has 6, and the DG-3 has 8 evenly spaced contact points, for optimal thermal distribution. Uses any external 9-15 Volt DC supply or you can run it on a 9 Volt battery in a pinch. No more heat ropes!