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Message: <blockquote data-quote="dieselnutjob" data-source="post: 820173" data-attributes="member: 47318">I just gave it a try.Setting the AF-ON button to AF-ON (the default) seems to cause the focusing system to operator constantly as if the shutter is half pressed, so keeping it pressed and then pressing the shutter button makes no difference because it's already continuously focusing.Setting the AF-ON button to AF lock only seems to give the desired effect of a back button focus for those who don't want to commit to back button focus.  Basically you still have to half press to focus, but, if you then press the AF-ON button the focusing system sort of "disconnects" so provided that you keep pressing it you can recompose with refocusing.</blockquote>