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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
Sat 04-May-13 07:00 PM

I'll get there at some point, but I'm pretty sure I'm not to that stage of debugging yet; just trying to gather information and theories at this point.

That said, I have trouble believing that it's back-focus because there is pretty much always something in focus when this problem occurs. Beyond that, for the times when the problem doesn't happen, the focus is spot on:

http://blog.doppler-photo.net/2013/04/drops-of-jupiter.html
http://blog.doppler-photo.net/2013/04/byobw-2013-comin-in-hot.html


I'll keep playing and see what happens, though. I suspect that dialing a3 (Focus tracking with lock on) up and down when I'm running into this will be informative, since that'll tell help me figure out if any of the following might be the case:


  1. The camera is focusing on the intended subject and jumping to the background

  2. The camera is focusing on the background and just doesn't "see" the intended subject

  3. The camera is focusing on the background, and would jump to the intended subject with the lock-on set to lower duration.

  4. The camera's AF is "nervous," and is jumping around, which causes it to lock on to things other than the intended subject.


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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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