Investigated the original uncalibrated files and didn't find the sky background to be any different on either side of the Meridian flip (a bit darker as the night wore on) so think the error is rotating the calibrated lights before debayering? Why would that be an issue? Something about assumptions made about pixel array I guess? Anyway think I have the full 3 hours and 20 minutes now....
Last edited by Benjamin; 17-09-2017 at 03:29 PM.
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