Quote:
Originally Posted by alistairsam
Rob,
I've wanted to do this as well with the dew cap like SCT's but would it be effective if you're imaging near the zenith?
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Theroretically there should be problems, but since I've done this I haven't had secondary dewing problems even in quite damp conditions (touch wood!) over last few years. I try not to leave the scope pointing overhead indefinitely mind you unless chasing an object over the meridian while imaging.