Quote:
Originally Posted by Peter Ward
There looks to be some (subtle) vertical banding in the the Antennae colliding galaxies image....which would concern me... hence you might want to investigate the cause a little further while the camera is still under warranty.
I little more attention to focus, guiding and RGB registration and you'll be producing top shelf results 
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Thanks for your comment Peter. Yes there is some banding evident. I think it might be due to calibration issues - so far I have let Maxim take care of it and automatically handle the set of calibration darks, bias etc. But I probably need to check that it's doing it correctly. Just as a test I'll try stacking again without calibrating and see if there is a difference, to pinpoint the issue.