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The testing was done with a fan on the cold face. Unable to fit my present box on my focuser I have just made up another cardboard box 25 by 13 by 9 cm. Not yet insulated the temp in the empty box dropped from 25 deg to 15 deg in 15 min without any frost on the cold face. My intention is to insulate the box externally with, I hope, 10 mm foam If I can find some and also insert the small heat sink on the cold face and attach the fan to that like Simon suggested. With the camera in the box, turned on, it took 20 min to reach 14 degrees. It appears that with this kind of a setup with frost forming on the cold face I have to be contend with temp around 15 or a little less. (By the way, inserting the copper lining in my earlier cooler box made little or no difference to the drop in temp. I will not be doing that in the new box.)
Will keep you informed Daniel
Ken
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