Quote:
Originally Posted by gregbradley
Do you subtract a bias from your flat?
I used to get grid patterns sometimes in bias images using a 694CCD. They would callibrate out usually (not always).
Greg.
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Hi Greg! Yes, in my first post I said "bias subtracted." Also, tried without bias subtracted....same result.
I have some subs, but not enough yet for a decent image so I've been a bit lazy calibrating and using these flats. Hopefully not too much longer but of course the weather has changed for the worse (again).
P