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

 Stephen Shepherd wrote"
> I have noticed that when shooting stuff on a white backdrop (back lit
> exposed about +2 stops to white it out) that I am getting a fall off of
> light on my 1ds files at the bottom of the frames, the top of the frame is
> definitely brighter / cleaner, although I have not tested other lenses as
> yet it is happening with the 100mm macro.


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