Nikon D4 - Manual (Page 123)

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Focus
This section describes the options that control how your camera
focuses when photographs are framed in the viewfinder. Focus
can be adjusted automatically or manually (
0 108). The user can
also select the focus point for automatic or manual focus ( 0 103)
or use focus lock to focus to recompose photographs after
focusing (
0 105).
To use autofocus, rotate the focus-
mode selector to AF.
Autofocus Mode
Choose from the following autofocus modes:
Autofocus
Mode Description
AF-S
Single-servo autofocus : For stationary subjects. Focus locks when
shutter-release button is pressed halfway. At default settings,
shutter can only be released when in-focus indicator (
I) is
displayed (focus priority; 0 308).
AF-C
Continuous-servo autofocus : For moving subjects. Camera focuses
continuously while shutter-release button is pressed halfway; if
subject moves, camera will engage predictive focus tracking (
0 99)
to predict final distance to subject and adjust focus as necessary.
At default settings, shutter can be released whether or not subject
is in focus (release priority;
0 307).
Focus-mode selector