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Message: <blockquote data-quote="BackdoorArts" data-source="post: 535225" data-attributes="member: 9240"><p>Here's my understanding.  It has the normal AF Fine tune available in current bodies.  It also has the Auto Fine Tune that allows you to set the Fine Tune on Nikon Lenses using Live View's more accurate focusing.  It's a situational override for the stored AF Fine Tune.  You might wonder why you'd need that, but say you've calibrated you 70-200mm, or better yet a 200-500mm at the long end and you suddenly are out somewhere and shooting at the near end, you can calibrate it at another point in the zoom for the situation and know that it's not going to be "close" but it'll be spot on.  I suspect it doesn't buy you a lot for fixed length lenses, but for zooms it's a great option.  Wish it worked with all glass.</p></blockquote><p></p>