Nikon D4S - Manual (Page 119)

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Focus
This section describes the focus options available when
photographs are framed in the viewfinder. Focus can be adjusted
automatically (see below) 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 AF : 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; 0 314).
AF-C
Continuous-servo AF : 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;
0 313).
Focus-mode selector