Nikon D810 - Manual (Page 111)

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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 (0 100). The
user can also select the focus point for automatic or manual
focus (0 94) or use focus lock to focus to recompose
photographs after focusing (0 96).
To use autofocus, rotate the focus-mode
selector to AF.
Autofocus Mode
The following autofocus modes can be selected during
viewfinder photography:
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; 0 307).
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 88) 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; 0 306).
Focus-mode selector