Nikon D5100 Reference Manual page 36

II Choosingthe Focus Point
The method for selecting the focus point for autofocus
varies with the option selected for AF-area mode
(_ 101).
c8](face-priority AF):A double yellow border will be
displayed when the camera detects a portrait subject
facing the camera (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).
_,0_/B2, (wide-and normal-area AF): Use the multi selector to
move the focus point anywhere in the frame, or press
_) to position the focus point in the center of the
fra me.
Focus
point
@
_3-(subject-tracking AF): Position the focus point over
your subject and press _). The focus point will track
the selected subject as it moves through the frame. To
end focus tracking, press _) a second time.
Focus poin t
Focus point
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.
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