The Y Button; Choosing A Metering Option - Nikon D6 User Manual With Warranty

The Y Button

Use the Y button to choose how the camera meters light when
setting exposure.

Choosing a Metering Option

Hold the Y button and rotate the main command dial.
Option
[Matrix
L
metering]
[Center-
M
weighted
metering]
Matrix metering is adapted to a wide range of
subjects. It produces natural-looking results.
The camera assigns the greatest weight to the
center of the frame. It can be used with subjects
that dominate the composition, for example.
Description
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The Y Button