I don't know your routine for taking flats but if they are over correcting it is likely they are not scaled properly. To scale them you need to subtract a bias of equal length (sub time) at the exact same temperature you've shot your flat frames. If this still doesn't work you need to reduce or increase your flat times (and bias) until you hit the spot. Good luck.
Quote:
Originally Posted by LewisM
Seriously, if your sensor is so filthy, CLEAN IT! I really think flats are a lazy excuse sometimes for a clean sensor.
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Really?
That's a bit simplistic Lewis. How do you deal with dust motes on filters, correctors, lenses then? Get a mop?
