Nikon D5 - Manual (Page 27)

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The D5 can fine-tune autofocus automatically. The results
can be used with all lenses of the same type.
Use only as required. AF fine-tuning should be performed at
the focus distance at which the lens is normally used; fine-
tuning performed at short focus distances may be less effec-
tive with distant subjects and vice versa.
1 Ready the camera.
Mount the camera on a tripod and aim the camera at
a flat, high-contrast subject parallel to the camera fo-
cal plane. Note that auto AF fine-tuning works best
at maximum aperture and may not function in dark
surroundings.
Auto AF Fine-Tuning