Ganymede12 Posted April 6, 2012 Share Posted April 6, 2012 Why don't reflector telescopes have dew caps. Does dew not form on mirrors or do they ruin the performance of the scope somehow? Link to comment Share on other sites More sharing options...
brantuk Posted April 6, 2012 Share Posted April 6, 2012 Errrmmm... reflectors do have dew caps which come off during a session - but newtonians have their mirrors right down inside the tube so usually don't dew up. If they do you can rig a fan behind them to keep the air moving to prevent dew - but it's not allways necessary. Mak's and Sct's are enclosed so the mirrors are even more protected from dew on those. Link to comment Share on other sites More sharing options...
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