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Message: <blockquote data-quote="Horoscope Fish" data-source="post: 474809" data-attributes="member: 13090">Front/Back focus is consistent in that it is always one, or the other (at the same focusing distance) and to the same degree. That being said, a lens can front or back focus at one focusing distance and do the other at a different distance. Auto-focus is not always "spot on", however, and that might be partly to blame. Still, I like Sigma's approach to AF Fine Tuning, in that the correction is applied to the lens, not the camera body; it's a far, far more elegant solution in my opinion. The USB Docks works just fine, even if I did find it a little awkward to to use and  fine tuning your lenses for Front/Back focus is something that absolutely should be done if at all possible. Since the D5300 body does not support AF Fine Tuning, the Sigma Dock is pretty much your only option.....</blockquote>