Nikon D3X - Manual (Page 137)

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To choose a metering method,
press the metering selector lock
button and rotate the metering
selector until the desired mode is
displayed.
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3D Color Matrix II Metering
In matrix metering, exposure is set using a 1005-segment RGB sensor. Use
a type G or D lens for results that include range information (3D color
matrix metering II; see page 384 for information on lens types). With other
CPU lenses, 3D range information is not included (color matrix metering
II). Color matrix metering is available when focal length and maximum
aperture of non-CPU lens are specified using [Non-CPU lens data] item in
setup menu (see page 218; center-weighted metering is used if focal
length or aperture is not specified).
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See Also
For information on choosing the size of the area assigned the greatest
weight in center-weighted metering, see Custom Setting b5 ([Center-
weighted area], pg. 316). For information on making separate
adjustments to optimal exposure for each metering method, see Custom
Setting b6 ([Fine tune optimal exposure], pg. 316).
Metering selector