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It doesn't have to be cooled down as such but if you are taking images continuously then it will generate more heat than if you take an image and then wait 30, then take another one. When collecting lights and darks I will wait 30 sec before taking the next image. In a normal course of a nights images I will take a series of lights then a series of darks, but I will always spend at least 30 to 30 min with the camera turned on (AC powered) taking focus shots or sample shots just to get the camera up to temperature.
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