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Paul,
I understand your reasoning, and for darks of 30 minute duration or so I feel you have a point.
However, with a flat it is typically 1 second or so per shot, and this takes longer to download than take, so I do them on the job so to speak.
If anything, I have a very minimal disturbance of the imaging setup, where the camera remains in the focuser, the focuser is motor driven and therefore not moved unless focussing at the start of the night, so if anything mine is semi-permanent, and I still shoot flats each time.
Where you remove the camera, or move anything I feel you are better shooting them all the time. Try an old one though and see.
Hey send some of that rain across please, we are in a drought, it is as dry as.
Gary
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