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Message: <blockquote data-quote="Bob Blaylock" data-source="post: 500769" data-attributes="member: 16749">It's not as easy to tell, as there is much less recognizable background in these shots than in your earlier shots, but on careful examination, it still appears to be the case, again, that the background is more blurred in the lighter shots than in the darker shots in the same set.  This was with the same lens on a different body, right?  So the issue appear to be with the lens.  Probably a sticky aperture.  Have you tried my other suggestion, with the lens off of the camera, working the aperture linkage by hand and watching how the aperture responds?</blockquote>