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D7100: AF focuses on background a lot?


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doppler_fto

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"RE: D7100: AF focuses on background a lot?"

doppler_fto Registered since 23rd Mar 2013
Fri 03-May-13 08:11 PM

JosephK: Yeah, I was thinking of that. See here:
http://web.mit.edu/~xsdg/www/stuff/d7100-focus/

(Is there any good way to link to the images _without_ having the forum auto-load the images? I'd like to make them easier to click, but don't want folks' browsers pulling down 16MB of images automatically)

In 0929, I had a left focus point squarely on the white shirt guy, and the camera focused on the background. I figured "oh, hmm, must not be enough contrast. That's weird." Then I saw the guy with the detail-laden shirt walking toward me and figured I'd try the shot again. "His shirt has a _ton_ of detail, so it can't miss" I figured. But I was wrong. Focused on the background _again_. And I was chimping between those two shots, so it's not like it was locked onto the background during the entire period.

Also, as mentioned, I am positive that I had the indicated AF point squarely on the guy's shirt. I actually hit the shutter release on 0930 after I had been willing the AF to bite for a half-second or a second, so he was in the exact same position as 0929 when I started trying to AF on him.

For these shots, I'm confident (but not positive) that I was in AF-11 mode. So the focus point would have been the left (not far-left) vertically-centered AF point.

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This is a hot topic  It has been locked by a team member D7100: AF focuses on background a lot? [View all] , doppler_fto , Fri 03-May-13 05:19 AM
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