Nikon D800 User Manual (en)

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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 (see below) or manually (
The user can also select the focus point for automatic or manual 
focus (
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after focusing (
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
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 (
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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
Focus-mode 
selector