Nikon D3100 - Manual (Page 75)

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z
3
Choose an AF-area mode.
Highlight one of the following options and press
J. To return to shooting mode, press the
shutter-release button halfway.
A
AF-Area Mode
The AF-area mode used when photographs are framed in the
viewfinder can also be selected using the AF-area mode >
Viewfinder option in the shooting menu (
0 131). AF-area mode
selections made in shooting modes other than P, S, A, or M are reset
when another shooting mode is selected.
A
3D-tracking (11 Points)
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 the same color as the background.