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Its just that when I looked over your data I noticed what appeared to be a centered radial gradient. I've attached a diagonal line profile which shows the histogram increase. This could simply be wispy nebulosity, but I have not seen this before. If there is a calibration process that is going to cause you grief - it will be with your flats!
Jase, This central gradient you have pointed out has caused me grief from day one, it appears in all my images after i have processed then correctly with darks/flats etc.
I always have to work on the image by making it darker to get rid of it.
I know the procedure i follow is correct as i have had good advice from many members, as your self, but that central gradient is always there.
Leon
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