Auto Af Fine-Tuning - Nikon D850 Technical Manual

Auto AF Fine-Tuning

The D850 can fine-tune autofocus automatically. The re-
sults 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.
Ready the camera.
1
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.
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