I've completely forgotten what I learnt in year 2 thermodynamics (many years ago). But isn't it just related to the temp difference between the source of the heat and the surrounding air. So whack a temp probe on the camera and see what it is - if you can get one on the peltier element. If it's much more than ambient then the fan should help. If not placebo is usually a third of any drug effect in a clinical trial
My ignorant 2c worth ...
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