Nikon D500 - Manual (Page 155)

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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 control panel.
A
Non-CPU Lens Data
Specifying the focal length and maximum aperture of non-CPU lenses
using the Non-CPU lens data option in the setup menu (
0 251)
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;
0 325).
A
See Also
See Custom Setting b5 (Matrix metering, 0 295) 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,
0 295).
Y button Main command
dial
Control panel
Viewfinder