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AstroSystems amazing Dew Guard secondary heating system attaches directly to your secondary mirror and then automatically senses the air temperature and the mirror temperature, then maintains the secondary mirror at a preset (adjustable) temperature above the ambient air temperature. It gently warms the secondary with 2-4 watts when on full and has 4-8 evenly spaced contact points for optimum thermal distribution. Uses any external 12 volt dc supply or you can run on a 9v battery in a pinch. No more heat ropes!
2.4"-3.1" minor axis
3 watt max