Nikon D800 User Manual (en)

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Autofocus mode can 
be selected by 
pressing the AF-mode 
button and rotating 
the main command 
dial until the desired 
setting is displayed in 
the viewfinder and 
control panel.
A
The 
B Button
For the purpose of focusing the camera, 
pressing the 
B button has the same effect 
as pressing the shutter-release button 
halfway.
A
Predictive Focus Tracking
In AF-C 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 or the 
B button is pressed.
 
This allows the camera to track focus while attempting to predict where 
the subject will be when the shutter is released.
A
See Also
For information on using focus priority in continuous-servo AF, see 
Custom Setting a1 (AF-C priority selection
 
For information 
on using release priority in single-servo AF, see Custom Setting a2 (AF-S 
priority selection
 
For information on preventing the camera 
from focusing when the shutter-release button is pressed halfway, see 
Custom Setting a4 (AF activation
0 283). See page 48 for information 
on the autofocus options available in live view or during movie 
recording.
AF-mode button
Main command dial
Control panel
Viewfinder
B button