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Message: <blockquote data-quote="BackdoorArts" data-source="post: 585333" data-attributes="member: 9240"><p>It means the autofocus locks at a point in front of where you expected it to focus.  Back-focus is in the opposite direction. In most current cameras this can be corrected using the AF Fine Tuning in the camera, though with zoom lenses you can have a combination of front and back focus throughout the range of the zoom so you have to decide how best to tune it (in general it's best to measure across the range and pick something that is either common to most focal lengths or err on the size of the long end because depth of field is most shallow there and you may be more apt to use bigger apertures).</p></blockquote><p></p>