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Message: <blockquote data-quote="BackdoorArts" data-source="post: 98753" data-attributes="member: 9240">If I read the question right it has less to do with front/back focus and more to do with continuity of focus as you zoom.  In other words, zooming in to 105mm, focusing, and then zooming out again only to find the object is no longer in focus.  To which my answer would be, "That's the way the lens is designed, and it would never have worked like that on the D90, D40 or any other camera".  The optics are such that they move as you zoom, making it necessary to readjust the focus at the new focal length.  There are some zoom lenses that can maintain focus across the entire zoom range, but the 18-105 is definitely not one of them.  If you experience it with the D90 or D40 then it has to be because the camera refocused for you before taking the photo.  As was suggested, check your auto-focus settings.</blockquote>