Nikon D4 - Manual (Page 79)

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❚❚Choosing an AF-Area Mode
The following AF-area modes can be selected in live view:
Mode Description
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Face-priority AF : Use for portraits. The camera automatically detects
and focuses on portrait subjects; the selected subject is indicated
by a double yellow border (if multiple faces, up to a maximum of
35, are detected, the camera will focus on the closest subject; to
choose a different subject, use the multi selector). If the camera
can no longer detect the subject (because, for example, the
subject has turned to face away from the camera), the border will
no longer be displayed.
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Wide-area AF : Use for hand-held shots of landscapes and other non-
portrait subjects. Use the multi selector to move the focus point
anywhere in the frame, or press the center of the multi selector to
position the focus point in the center of the frame.
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Normal-area AF : Use for pin-point focus on a selected spot in the
frame. Use the multi selector to move the focus point anywhere in
the frame, or press the center of the multi selector to position the
focus point in the center of the frame. A tripod is recommended.
&
Subject-tracking AF : Position the focus point over your subject and
press the center of the multi selector. The focus point will track the
selected subject as it moves through the frame. To end tracking,
press the center of the multi selector again.
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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.