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thank you guy's for the replies, I thought i had email notification for this thread - but i hadn't.
Ok, so ideally take flats at the end of every night for the images taken that night, and make a master flat out of them - and do this for each nights imaging to apply to the light frames taken on that night only. And do not combine flats from different nights of imaging due to the chance of changing dust particles.
Does this make sense?
thanks
Josh
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