Quote:
Originally Posted by marki
Looks like reflections to me Trevor. You should always take your flats on the night as bits of dust etc will have collected/moved that would not have been there when the flats were taken. If you have broken down the mount and resetup on another night the flats you took 2 weeks previously will not work.
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I would have guessed dust rather than reflections.
Trevor, even if you had shot flats on the same night, do you do individual flats for each of L, R, G and B? Dust would be in different places on different filters.