A: Focus; A1: Af-C Priority Selection; A1 [Af-C Priority Selection] - Nikon Z 9 Reference Manual

a: Focus

a1: AF-C Priority Selection

Choose whether photos can be taken before the camera focuses when
AF-C is selected.
Option
G
[Release]
[Focus +
B
release]
F [Focus]
A Custom Settings: Fine-Tuning Camera Settings
598
G button U A Custom Settings menu
Photos can be taken whenever the shutter-release
button is pressed (release priority).
Priority is normally given to release, but if the
subject is dark or low contrast and the camera is in
continuous-release mode, priority will be given to
focus for the first shot in each series. For the
remaining shots, priority will be given to release
regardless of focus. This helps ensure that the first
shot in each series is in focus.
Photos can be taken only when the camera is in
focus (focus priority).
Description