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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 on a 9v battery mounted at the holder, eliminating the need for wires across the spider. No more heat ropes! Three sizes to choose from.
Note: If your secondary is glued to a center post, the Dew Guard cannot be used.
| DG-1 | Secondary minor axis 1.5" - 2.4" | $37.00 |
| DG-2 | Secondary minor axis 2.5" - 3.1" | $42.00 |
| DG-3 | Secondary minor axis 3.5" - 7" | $47.00 |
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Click here for operating and installation instructions.