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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
Mon 06-May-13 06:27 PM

My apologies for the curt response; I appreciate that you were trying to help.

From my perspective, I know for a fact that back-focusing is not the issue. Sure, the focusing might not be perfect, but it's also not so far off to cause this issue that I'm seeing. I specifically said "The camera isn't back focusing" because I know that to be the case. I had intended that part of my message to preempt well-meaning folks from suggesting that I should check if the body is back-focusing, because it isn't.

It is no coincidence that there is generally something in pretty good focus, regardless of the distance between the intended subject and that properly-focused background element. If the combo were back-focusing, this would not be the case — there would consistenly be cases where the body locks focus and nothing is actually in focus. But that does not occur.

As mentioned, I've already run a couple thousand frames through these cameras, including a bunch in low-light and at f/2.8. I know that I can get stellar results from both cameras and both lenses, I just want to see those results more consistently in situations where a properly-functioning AF system would deliver the goods without hesitation. Just because I'm only showing a handful of sample images doesn't mean that I haven't considered the problem in greater depth than may be apparent from the post.

So yes, I appreciate that you were trying to help, but I was frustrated because I already said explicitly in the original post that this kind of response would not be helpful. And true to form, it was not helpful, despite the good intentions.

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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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