Nikon D3100 - Manual (Page 55)

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Choose the focus point.
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, press the multi
selector up, down, left, or right).
Wide- and normal-area AF : Use the multi selector
to move the focus point to any point in the
frame, or press
J to position the focus point
in the center of the frame.
Subject-tracking AF : Position the focus point
over your subject and press J. The focus
point will track the selected subject as it
moves through the frame.
Focus point
Focus point
Focus point