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Tokina 12-24 f/4 soft focus?

Nikon - www.thephotoforum.com
Hey all, I picked up a used Tokina 12-24 f/4 on ebay a few weeks ago, and I've now used it several times on my D500 at events. My initial testing at home showed that it was reasonably sharp, however my experience in the field has been much different. On my D500 in AF-C, single point focus, I've been getting very soft focus, and possibly severe back focusing.

At close distances this hasn't been a problem.. focus within 10 feet is tack sharp. This photo is a very good example of the problem I've been having.. The text on the wall is sharper than the girls' faces, but to me it looks like more than simple back focusing. There is just an oddly soft quality to the entire photo.

I'm going to try AF fine tuning for a further distance and seeing if it helps, but this requires going outside and the Buffalo weather hasn't been cooperating lately.

What do you guys think could be causing this?

 
Date: Feb 16, 2017   


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