Nikon Df - Manual (Page 79)

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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 68). The user can also
select the focus point for automatic or manual focus (0 64) or use
focus lock to focus to recompose photographs after focusing
(0 66).
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; 0 246).
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 60) 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; 0 246).
Focus-mode selector