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Thank you Greg for explaining that. I know that the manual for my QSI states that I can safely unplug the camera when it is cooled down to whether temperature it has been set. I just thought that rapid temperature changes may cause some extra degradation of the CCD- clearly I have been too cautious.
Nevertheless, in SGP you can set cooling down/warming up time to whatever length you desire; I usually set it to 5 minutes so it does not take too long and is more gradual than simply turning off cooling. BTW my camera's cooling is amazingly efficient; it takes about 3 minutes to bring the temperature of the CCD down by 40 degrees.
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