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Message: <blockquote data-quote="Don Kuykendall_RIP" data-source="post: 428671" data-attributes="member: 6277">You need to read up on setting the Fine Tune. You would never set focus at infinity or even 200  feet.  Read on on how it is done and at what distance. I think the standard distance is 50 times the focal distance. So your 300 mm should be at approximately 50 feet. the extremes they are talking about is not distance away but at what zoom you are using. I would always do it at the long end since it is the most critical (most shallow DOF)You can't just make it up as you go or you will never get it as sharp as it can be..  2 or 3 numbers off makes a huge difference. Google it and follow the directions. You don't know more than the experts on this.</blockquote>