Nikon D6 Reference Manual page 250

A
Metered Area
•
In [Spot metering], exposure will be locked at the value metered in a
circle centered on the current focus point ( 0 178).
•
In [Center-weighted metering], exposure will be locked at the value
metered in a 12-mm circle in the center of the viewfinder.
A
Adjusting Shutter Speed and Aperture
The following settings can be adjusted while the center of the sub-
selector is pressed:
Mode
P
S
A
•
The new values can be confirmed in the viewfinder and top control
panel.
•
The option selected for metering cannot be changed while exposure
lock is in effect.
198
Exposure-Related Settings (Metering and Exposure Compensation)
Shutter speed and aperture (flexible program; 0 184)
Setting
Shutter speed
Aperture