Nikon Z8 User Manual page 183

Option
[3D-
u
tracking]
[Subject-
n
tracking AF]
[Auto-area
h
AF]
The camera tracks focus on a selected subject.
Position the focus point over your subject and start tracking by pressing
AF‑ON or by pressing the shutter-release button halfway; focus will then
track the selected subject as it moves through the frame. Release the
button to end tracking and restore the previously-selected focus point.
If the subject leaves the frame, remove your finger from the shutter-release
button and recompose the photograph with the subject in the selected
focus point.
This option is only available when photo mode is selected and
[Continuous AF] is chosen for focus mode.
Track focus on a selected subject.
Position the focus point over your subject and start tracking by pressing
J or AF‑ON or by pressing the shutter-release button halfway; focus will
then track the selected subject as it moves through the frame. To end
tracking and select the center focus point, press J.
This option is only available in video mode.
The camera automatically detects the subject and selects the focus point.
Use on occasions when you don't have time to select the focus point
yourself, for portraits, or for snapshots and other spur-of-the-moment
photos.
Description
109
Focus