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Message: <blockquote data-quote="BackdoorArts" data-source="post: 133501" data-attributes="member: 9240">Having not performed the test, I can't explain what I didn't test.  I only thought it was interesting that I'd just heard yesterday that maintaining focus on the 85mm 1.4 was a familiar problem.That said, if the problem is apparent through apertures f2.5 then you're now dealing with a deeper dof and it isn't just a reframing issue.  On every prime I would perform a fine tuning focus adjustment on the camera at maximum aperture (f1.4).  Once that's done I would assume that it should maintain focus at smaller apertures, regardless of camera.  Reading that it didn't help and experiencing it are two different things. I do recall reading something about the 1.4 behaving badly after fine tuning, but I couldn't possibly remember where.</blockquote>