D800 focus with 1.4 prime lenses is very variable and inaccurate

Started Jan 20, 2013 | Discussions thread
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My conclusion after my D800 went 3 times to Nikon service
In reply to primeshooter, Jan 20, 2013

is that AF module cannot perfectly cope with the vary shallow "effective dof" coming out from the combination of 36 megapixels and large apertures. Lenses with "short throw" cam, like the 14-24mm f2.8, suffer as much as, if not more, faster aperture lenses.

If you repeat single focusing at the same target, you will notice that at each half shutter press the distance scale changes a bit. That causes the focus plane to move forwards and backwards, in a way that may throw subjects out of focus depending on lens dof. The effect is magnified by the 36 megapixels.

I came to accept that, in the end. It is not fixable, it is a camera feature.

Best regards,


 Mauro.B's gear list:Mauro.B's gear list
Ricoh GR Leica Q Leica M Typ 240 Fujifilm X-T1 Nikon D810
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