On 8/27/2012 10:24 AM, John Sessoms wrote:
From: Walt Gilbert
On 8/26/2012 1:38 PM, John Sessoms wrote:
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.
I just picked up the camera body, which I hadn't touched since I
finished shooting the sunrise shots -- it seems I inadvertently switched
it to AF-C somehow over the course of the night. I did some manual
focusing at times, so I probably failed to switch it back to AF-S when I
finished manually focusing.
Thanks for the pointer!
If you're going to use the back AF button for focusing AF-C is what
you're going to want.
I very rarely use AF-C. I just don't find it to be quick enough -- at
least not with the lenses I have at my disposal -- to use for its
intended purpose. Maybe higher-end lenses have better response, but the
ones I have just don't seem to work well.
I will make it a point to start using the back AF button, though. I've
always just used the shutter button, but I can see where the back button
just might be the way to go -- especially in AF-C.
-- Walt
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