Nikon D750 DSLR Camera (Body Only) - Manual (Page 153)

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AF-area mode can be selected
by pressing the AF-mode
button and rotating the sub-
command dial until the desired
setting is displayed in the
viewfinder or control panel.
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.
AF-mode button Sub-command
dial
Control panel Viewfinder