Nikon D610 - Manual (Page 123)

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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
(
0 103). The user can also select the focus point for automatic or manual focus
( 0 101) or use focus lock to focus to recompose photographs after focusing (0 102).
To use autofocus, rotate the focus-mode selector to AF.
Autofocus Mode
Choose from the following autofocus modes:
Autofocus
Mode Description
AF-A
Auto-servo AF : Camera automatically selects single-servo autofocus if subject is stationary,
continuous-servo autofocus if subject is moving.
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 is
displayed (focus priority;
0 221).
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 (
0 100) 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;
0 221).
A
Predictive Focus Tracking
In AF-C mode or when continuous-servo autofocus is selected in AF-A mode, the camera will
initiate predictive focus tracking if the subject moves toward or away from the camera while
the shutter-release button is pressed halfway.
This allows the camera to track focus while
attempting to predict where the subject will be when the shutter is released.
Focus-mode selector