Quote:
Originally Posted by Sunfish
Maybe the focus is not perfect and varies over the night and between filters particularly lum. I don’t see this problem in my 1600 . Interesting to see the result without the lum and less stretchand see if that filter is the problem.
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Thanks Ray - this also happens with SHO imaging and in particular with my OIII filter (Astronomik 6nm 1.25"). I've attached a screenshot from PI of the individual R, G and B master frames, definitely more pronounce with G and B filters.