Nikon D780 DSLR Camera (Body Only) - Manual (Page 195)

149 Shooting Settings
A 3D-Tracking
When [ 3D-tracking ] is selected for AF-area mode, the camera stores the
colors in the area surrounding the focus point at the moment the shutter-
release button is pressed halfway. 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 Quick Focus-Point Selection
For quicker focus-point selection, choose [ Every other point ] for Custom
Setting a6 [ Focus points used ] to use only a quarter of the available focus
points.
A AF-S/AF-I Teleconverters
If [ 3D-tracking ] or [ Auto-area AF ] is selected for AF-area mode when an
AF-S/AF-I teleconverter is used, [ Single-point AF ] will automatically be
selected at combined apertures slower than f/5.6.