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D800... AF is a big quality concern for me (after testing 3 units)
I just received my pre-order Nikon D800 last week from Amazon. The camera serial number is 3004XXX so it is not from one of the earlier production runs but also not from some of the latest being reported (3008XXX+). Either way, the main reason I wanted this camera was to step up to an FX sensor with three fast prime lenses for optimal bokeh. The lenses I have include the Nikon 24mm f/1.4G, the Sigma 85mm f/1.4 EX DG HSM, and the Sigma 50mm f/1.4 EX DG HSM.
Unfortunately the D800 I received has the notorious left side AF problem that has been widely reported on in dpreview and other photograpohy forums. Basically the issue is this... if AF-S focusing is used and any lens is set to f/1.4 the leftmost AF point in the viewfinder backfocuses significantly on the target. Using the rightmost AF point also yeilds a noticeably soft focus compared to the center AF point (which is uniformly sharp). I haven't tested focus accuracy in AF-C mode at f/1.4 but if it also uses the phase detection focus system of the viewfinder I suspect it will be unable to track subjects sharply once they leave the center of the frame. If you search for Nikon D800 AF problems online you can see numerous example images posted.
Many other users have reported AF problems but certainly not every D800 user has. If there is a widespread manufacturing QC problem I suspect that many of those that haven't reported a problem either don't own any fast lenses, stay above f/2.8, or only use the center AF point to focus and as such don't know yet that their camera has a defect. I would definitely recommend that everyone at least test their AF point accuracy to check this. For me it is a potential show stopper. If a $3000 camera can't focus accurately with all AF points with an f/1.4 lens it is useless for me and must be either fixed by Nikon or returned. I currently have an open support ticket with Nikon US complete with sample images of the focus problem but have not heard back from them yet.
May 2012 · Electronics · verified purchase