|
I really wonder if your problem is field rotation or just registration problems due to field curvature. I know the TSA is well colour corrected but it dose have issues with curvature. I have also found there can be small changes in focus between subs which can make itself evident in the registration of the 3 colours and this would also show up closer in the corners during longer exposures as the stars start to bloat a little with the extended exposure time.
Overall the issues you show here aren't to obvious unless you do a Fred style zoom in.
Just a thought.
|