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Yes, a cooler atmosphere does equal a cooler sensor, but not enough
cooler to begin to make a noticeable reduction to the noise in your images
until the ambient temperature gets down to around 5 or 6 degrees.
Even at 5 or 6 degs you need to give your sensor some time to cool down between subs, or it will just get hotter and hotter as the session goes on.
raymo
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