From: Walt Gilbert
Just a missed shot of the stage at the bike rally that came out looking
more interesting -- perhaps serendipitously amusing -- than I thought it
would. I still haven't figured out what threw the focus off so badly.
http://www.flickriver.com/photos/walt_gilbert/7863726622/
Are you using AF-S & holding the shutter button half way down for
auto-focus? If so, you have to keep continuous pressure. If you relax
the pressure even slightly, it can auto-focus again.
I used to have problems like this when I'd lift my finger a bit just
before pushing the shutter button all the way.
Try setting the camera to AF-C and auto-focus to the back AF button
only. It took me a little bit of effort to get used to doing it that way
(emphasis on little), but it solves the "why did it refocus?" problem.
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