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Greg,
Thanks for the tips and tricks you employ.
The point I took away from the article at SBIG is that dusk/dawn flats do not contain the light pollution frequencies and neither does a light box.
I've got an idea floating around in my mind. I wonder what you think! It seems to me that my blue frames contain information about the object being imaged as well as the problems in the optical system. I have green and red data that can be flatted without problem leaving just the object being imaged. So what if I took a flatted green image, normalized it to a blue image and subtracted the images from each other? Might that leave me with just the flat field?
Peter
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