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Message: <blockquote data-quote="aroy" data-source="post: 383503" data-attributes="member: 16090">Yes most of the bodies will expose a "dark frame" after each long shot. That is done to detect; and subtract; primarily thermal noise which affects sensors as they heat up during long exposures. The best method is to switch the NR off, but to take a "dark frame" at least once before first shot and once after the last shot. Use any of the free software available on the net to use the dark frames.The thermal noise is one of the reasons that most astrographers use cameras which are cooled. The cooler the better, and some dedicated cameras use liquid nitrogen for very low noise.</blockquote>