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I have worked out that the 5DH produces a fair bit of internal heat when taking a long exposure. It is a matter of balance to stop condensation. So far it is fine at 1 deg C. I do not know the temperature of the sensor but it would be higher by a few degrees or more?.
I am already very happy with the results. Why I put the fan inside the fridge was to even out any cooling to not get any cold spots.
It is now just experimenting to see how far I can push it. I have yet to decide whether the dew point is an important parameter or is the system isolated enough not to bother with another complicating factor.
Time will tell.
Bert
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