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Message: <blockquote data-quote="wornish" data-source="post: 433327" data-attributes="member: 15434">Depends on the focus mode settings on your camera if you are in af-s or af-c. If you are in af-c the focus will keep changing while you hold the back button, in af-s once pressed it locks and stays the same whatever you do unless you release and re press.The problem you seem to have is you were probably using centre spot exposure and the slightest change in where the spot is pointing at will change the setting. As @<a href="http://nikonites.com/member-13822-fastglass.html" target="_blank">FastGlass</a> says try centre weighted or even matrix.</blockquote>