Nikon D5 User Manual page 154

To choose a metering option, press the Y button and rotate the
main command dial until the desired setting is displayed in the
viewfinder and top control panel.
Y button
A
Non-CPU Lens Data
Specifying the focal length and maximum aperture of non-CPU lenses
Z
using the Non-CPU lens data option in the setup menu (0 241) allows
the camera to use color matrix metering when matrix is selected and
improves the accuracy of center-weighted and spot metering. Center-
weighted metering will be used if highlight-weighted metering is
selected with non-CPU lenses or if matrix metering is selected with non-
CPU lenses for which lens data have not been supplied. Note that
center-weighted metering may also be used if highlight-weighted
metering is selected with certain CPU lenses (AI-P NIKKOR lenses and AF
lenses that are not of type G, E, or D; 0 411).
A
See Also
See Custom Setting b5 (Matrix metering, 0 333) for information on
choosing whether matrix metering uses face detection. For information
on making separate adjustments to optimal exposure for each metering
method, see Custom Setting b7 (Fine-tune optimal exposure, 0 333).
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Main command dial
Top control panel
Viewfinder