A: Autofocus; A1: Af-C Priority Selection - Nikon D4 User Manual

a: Autofocus

a1: AF-C Priority Selection

When AF-C is selected for viewfinder photography (0 97), this
option controls whether photographs can be taken whenever the
shutter-release button is pressed (release priority) or only when the
camera is in focus (focus priority).
Option
G Release
Focus +
B
release
Release +
E
focus
F Focus
Regardless of the option selected, focus will not lock when AF-C is
selected for autofocus mode. The camera will continue to adjust
focus until the shutter is released.
Photos can be taken whenever the shutter-release
button is pressed.
Photos can be taken even when the camera is not in
focus. If the subject is dark or low contrast and the
camera is in continuous mode, priority will be given to
focus for the first shot in each series and to frame rate
for the remaining shots, ensuring a high frame rate if the
distance to the subject does not change during
shooting.
Photos can be taken even when the camera is not in
focus. In continuous mode, frame rate slows for
improved focus if the subject is dark or low contrast.
Photos can only be taken when the in-focus indicator
(I) is displayed.
G button A Custom Settings menu
Description
U
307