Nikon D800 User Manual (en)

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To choose an AF-area mode, press the AF-mode button and rotate 
the sub-command dial until the desired mode is displayed in the 
monitor.
AF-mode 
button
Sub-command 
dial
Monitor
D
Subject Tracking
The camera may be unable to track subjects if they move quickly, leave 
the frame or are obscured by other objects, change visibly in size, color, 
or brightness, or are too small, too large, too bright, too dark, or similar 
in color or brightness to the background.