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Hi Dunk and Brent,
I have my camera in a hermetically sealed box loaded with silica gel,
even then I have seen a little condensation at times. My next trick is to fill up the box with argon, to see if this helps. I have remove the back off my camera as it is not needed any more, it is totally controlled from Backyard EOS, which means that the argon can permeate into the guts of it. I think you are both dead right, below 12 degrees probably doesn't achieve a lot. My thought is if I can fill the space between the reducer and the camera sensor, as well as the back cavity with argon, then this may help a little. I have some argon on the way, so I have not tried this theory yet. My aim is to keep the sensor at reasonably constant temperature over a 5 to 10 minute exposure. That length of exposure is about the best I can do from Melbourne's light polluted suburb of Boronia.
Cheers
Peter
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