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I guess that if you image under conditions where the temperature drops rapidly and continues to do so without settling and becoming stable, then cooling is almost mandatory to optimise your results?
However, if your system cools down “naturally” and equalises without too much change in the outside temperature, maybe the contribution of these coolers is less important?
From what I have read, the top flight planetary imagers on Ice In Space tend to aim for a maximum 1 deg C delta betwixt optics and ambient.
Cheers
Dennis
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