Nikon COOLPIX-A - Manual (Page 98)

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Subject-tracking AF : Position
the focus area over your
subject and press
J. The
focus area will track the
selected subject as it
moves through the frame.
To end tracking, press
J
again.
Note that 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.
Focus area