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Message: <blockquote data-quote="BackdoorArts" data-source="post: 283814" data-attributes="member: 9240">Is it a lack of focus or is it minor camera movement?  You're shooting at 1/2500, so I suspect it's not movement, but having solid technique is important all the time.  Watch where your hand grips the glass and see if it can be slightly interfering with the focus (there's a Sigma lens that I have where the zoom and focus rings are reversed from Nikon standard and I'm always accidentally touching the focus ring).  Any minor movement of the focus ring will cause this until the camera readjusts, so it could have something to do with that, so check your technique.  Check your focus priority as well to see if it's on lock or shutter release.  Generally I keep it on lock for AF-S and shutter for AF-C.Just guesses.</blockquote>