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I use ASTAP to review , calibrate, align and stack my images. It has a feature to calculate your Sky Brightness in SQM but I don’t use it. In Sydney under B8 skies the Sky Brightness levels throughput the evening and early hours are vastly different.I don’t bother varying sub exposure lengths as the Sky Brightness it’s a constant moving target , setting different exposure lengths periodically all night long IMO would not yield better results so generally a waist of time. Also for multiple nights capture the Sky Brightness varies greatly as well
I leave the variables in Sky Brightness throughput a single session or multiple night session to my Stacking program ASTAP. You can stack using Average for a single night only which averages out your Sky Background or Stack using Average for multiple nights then Stack the averages using Sigma Clip. Never had an issue with Sky Brightness
ASTAP is an excellent Stacker and Plate Solver and has excellent support from its developer Han.
Martin
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