Thanks Doug. I use Sky Flats, just after sunset, an hour East of Zenith. If the sky itself wasn't 'flat', I'd expect to see a smoothly varying...
Thanks Doug. Attached are the files you requested. The one name Flat Light (Red) is the same one as above.
Added a single Flat Light through the red filter (a sky flat) and the original Light of the "bad read" image.
I've posted a similar message on CCD NEWASTRO, but now realize this is probably a better place to ask these questions ... My flats have this...
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