Quote:
Originally Posted by gregbradley
You should mind your manners Peter - no need to be rude.
To subtract a bias from your flat is standard procedure in CCDstack and in Wodaski's Zone book. If you feel otherwise you may well be right but
you could express that politely.
Greg.
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Easy does it Greg...you were not the subject of my post.
But as you've mentioned it, Ron is by no means the source of CCD gospel. There are a number of areas where I, and *many* others, do not have the same world view as Ron.
Subtracting a bias from a flat makes no sense unless you are operating at cryogenic temperatures...i.e. not taking darks.
For the rest of us darks are a necessary evil, and by defintion contain bias information, which is automatically taken out of a flat during dark frame subtraction.
For Paul: Mate, it's easy to calibrate images. All you need is a good library of matching dark frames (ie exposure and temp the same as the data), and flat frames for each filter....but I think you already knew that
