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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 06:15 PM

>The only one I tried to download showed the focus point being
>walking man's right hand(camera left) and is not locked on. It
>appears that the focus lock was not obtained before the
>shutter was released, as Release Priority is supposed to do,
>release regardless of focus.
>
>The dim light, underexposure, low contrast shirt target, if
>the moving person was the intended target, release priority
>and movement combined to make focusing less than assured.

There's a difference between "focus is not assured" and "try as I might, I just can't get the camera to focus on my intended subject."

More to the point, it feels like you're calling my competence into question. I know how release priority behaves. I know how AF-C behaves. I know what it sounds and feels like when the AF system thinks it's locked onto something, versus when it's still focusing or has failed to lock onto something.

In particular, I've been using this lens for the last four years. I've been using AF-C and Release Priority since I was shooting with my D70 nearly 10 years ago. It's been long enough that I can tell when the camera's AF should be locked onto something.

I can assure you that in this case, the AF system did lock onto something; it's just that the "something" was the background rather than my intended subject.

>If you want others to help it would be best to post 300k or
>less files directly on the thread. Few people would have the
>patience to download all those 30mb files from another web
>site.

Will do so.

>
>What about your other photos, in other AF modes with good
>targets, are they also missing focus? I doubt this is a case
>of "missed focus" more like premature release.

At this point, I'm going to stick with single-area AF and play with other options. I can't imagine any of the other AF modes helping the camera to focus on things I want it to focus on; it's already clear that what it wants to focus on is the background.

That said, here's the next example. Shown is a 100% crop of the exact center of the image. The red circle depicts the center of the image. I think one could reasonably expect "oh, hey, this wedding ring has a lot of contrast, why don't I focus on that?" Instead, the camera focuses on the background. Again. Seriously?

Settings:
1/500s f/4.5 100ISO 32mm, shooting in broad daylight with the 24-70/2.8 lens

AF Area Mode : Single Area
Phase Detect AF : On (51-point)
Primary AF Point : C6 (Center)
AF Points Used : C6

http://web.mit.edu/~xsdg/www/stuff/d7100-focus/710_3898.center-crop.small.jpg

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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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