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| Re: Weird Back Focusing issue. |
I'd do some more controlled testing in good light at 50x the focal length. Every time I have had a lens consistently miss at long distance the fine tune value has been off. Also check your focus point indicators in the vf are accurate positionally, if they are slightly off you can lock onto something other that what you intended.
Both my D700 and now D800 have issues when the thing I focusing on is about the size of the focus point box for example at f1/4 with someone's eye larger than the af point it will usually nail it but if the eye is the same size or smaller it will miss more often. That may have happened here.