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Message: <blockquote data-quote="canuck257" data-source="post: 470212" data-attributes="member: 38099">I had a few spare hours this morning so I thought I would put my lenses through the "Dot Focus" procedure.  Because of limited space I did all of them at the same distance from the target.  18-55mm, 18-140mm 50mm f1.8, 70-300mm, Tamzooka.  It's interesting that a couple of them had a range that was all on the plus side of zero. The focus ranges varied in length from 11 to 25 units.There are a couple of things that I am not sure of though.  When the adjusted value is saved, what is entered into the "default" setting?  Am I correct in assuming that A/F Fine Tune has to be switched on for these saved values to be applied by the camera otherwise it defaults to zero?</blockquote>