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Message: <blockquote data-quote="Don Kuykendall_RIP" data-source="post: 272458" data-attributes="member: 6277">So you have fine tuned the back focus on this lens?One thing you might do to test the movement factor is to shoot at that exact setting using the ISO to get the exposure correct and then crank up the ISO and shoot at 2.8 and say 1/500 sec.  If it is still soft then you probably have a bad back focus adjustment. If it is good then it is movement that is the problem. Then either you are moving or the VR is not working correctly. But at 1/160 on a 105 lens the VR is probably not even needed. I think the focus point changed when you focused and recomposed.</blockquote>