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Hi, just to let you know - I have the RC10 as well and on the humid, cold nights we had some 2-3 weeks back (Sydney - clear after rain) both the primary and secondary dew up. I have had this happen with fans running and with a dew shield fitted. Granted it was very heavy dew - the outside of the ota was streaming but I am resigned to a secondary heater and I think I will also put a band on the focuser as per Daves suggestion.
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