Nikon D4S - Manual (Page 123)

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• Group-area AF: The camera focuses using a group of focus points
selected by the user, reducing the risk of the camera focusing on
the background instead of on the main subject. Choose for
subjects that are difficult to photograph using a single focus
point. If faces are detected in AF-S focus mode, the camera will
give priority to portrait subjects.
• Auto-area AF: The camera automatically
detects the subject and selects the focus
point; if a face is detected, the camera will
give priority to the portrait subject. The
active focus points are highlighted briefly
after the camera focuses; in AF-C mode, the
main focus point remains highlighted after
the other focus points have turned off.
AF-area mode can be
selected by pressing
the AF-mode button
and rotating the sub-
command dial until
the desired setting is
displayed in the
viewfinder and top
control panel.
A
3D-tracking
When the shutter-release button is pressed halfway, the colors in the
area surrounding the focus point are stored in the camera.
Consequently 3D-tracking may not produce the desired results with
subjects that are similar in color to the background or that occupy a
very small area of the frame.
AF-mode button Sub-command dial
Top control panel Viewfinder