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Eddie I have not tried using a dew strap on the outside of the RC. I have noted lately that I am getting some dew forming on the primary after 5 or so hours of imaging. I used a small strap around the secondary some time ago and found it to be more trouble that it was worth. It effective reduced the brightness of objects and made the spikes look a little weird so I took it off. In really dew ridden conditions the scope struggles with keeping it at bay. Looks like another suggestion for Jim sheng coming on. An internal dew heater for the secondary might work well. Not sure about the primary. The glass must be very thin to end up with dew on it, otherwise it would continue to release heat all night.
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