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Message: <blockquote data-quote="Fred Kingston_RIP" data-source="post: 734305" data-attributes="member: 10742">You raise several questions, each requiring a serious response. Bear in mind, sensors "change" over time... One might produce more/less noise for the same duration of time at different time intervals. I don't want to use the word degrade because that implies a certain failure but the noise evident in a single shot may move or become more/less intense from one shot to the next. There are just too many variables to say that a single saved shot will have the same noise as one taken 10 minutes later... Hence, if you're going to use the NR shot as a comparison between frames... it needs to be taken under as much of the same conditions as the shot being compared to...  Storing/saving/using black shots in-camera for that purpose would take a bit more resources within the scope of all the other things a camera's memory and processor has to do...  Camera designers are always balancing features against available resources, against expected revenues... and frankly, the big guys, Nikon and Canon are doing a great job just staying alive in today's camera space...I haven't looked recently at the 3rd party Star Stacking/Trail software, but I recall at least one of them used a black shot for comparison as you mentioned in PS... so it is at least somewhat common to do that process in post processing rather than in-camera.I believe the article I referenced earlier made mention of the fact that the camera could be moved during the "Processing NR" comparison message... Although, I don't imagine a reason to do that during a session of shooting Star Trails...</blockquote>

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