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Thanks Greg,
yes I did take a new set of Bias frames for this but it might be my flats as I recall seeing the pattern in them. not sure how.
There are 2 or 3 clear nights this week, so hope to get the hrs I need and complete it.
Cheers
Alistair[/QUOTE]
I play around with calibration these days and see how it works. Sometimes I see better results with a bias subtracted from the flats when making the master flat and on some setups (CDK) it seems to work better to subtract the bias when the flats are being applied.
The fixed pattern noise may go also if you bias subtract from your flats when making the master flat. Not sure if darks remove it.
Greg.
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