Nikon D810 - Manual (Page 116)

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A
3D-tracking
When the shutter-release button is pressed halfway, the colors in the
area surrounding the focus point are stored in the camera.
Consequently 3D-tracking may not produce the desired results with
subjects that are similar in color to the background or that occupy a
very small area of the frame.
A AF-Area Mode
AF-area mode is shown in the control panel and viewfinder.
AF-area mode Control panel Viewfinder
Single-point AF
9-point dynamic-area AF *
21-point dynamic-area AF *
51-point dynamic-area AF *
3D-tracking
Group-area AF
Auto-area AF
* Only active focus point is displayed in the viewfinder. Remaining focus points provide
information to assist focus operation.
A Manual Focus
Single-point AF is automatically selected when manual focus is used.