Might be an old chesnut for some but not for me.
I've been calibrating my darks and flats with a master (super)bias in PI. Then calibrating my lights with these and the bias frame. Similar to this
http://www.lightvortexastronomy.com/...ixinsight.html
Writing it out now - it kind looks like a grammatically incorrect double negative?
So am I better off calibrating lights with darks and flats with dark flats. Then calibrating my lights with these calibrated darks and flats?
Sorry to hijack this Andy ...