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Because you really need to take the flats at the time you are taking the images. I have already been caught out using flats from a previous shoot which have not resolved issues from the current shoot. That won't happen again, I'm not wasting another night imaging. I always run a set of flats before I packup, it takes no time at all with a light box.
A Flat removes imperfections in the imaging train. It is not for CWB.
Last edited by Tandum; 12-11-2008 at 11:59 AM.
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