> Stephen,
> If you are using a shutter speed greater than 125th, your sync speed could
> be the problem.

Thanks Dave , Mark I suddenly thought this could be the case in onne of
those just falling asleep moments of clarity, I will have to check it, I was
using 1/250th at the time.

Also thanks Tim , 
"that an exposure made to give a density of, say RGB 180ish will have a
variation of about 10 points RGB between one spot and another.
I can't see it in any image with a subject, just when testing. I have used
different cameras, and they are each different."

I also do not see it in any image that has real "subjects" in it just
appears on white backdrop shots across the bottom of the frame (Landscape).


Stephen


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