Nikon D6, Reference Manual

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196
Exposure-Related Settings (Metering and Exposure Compensation)
Autoexposure Lock
Use autoexposure lock to recompose photographs after setting
exposure for a specific area of the subject. Exposure lock comes
in handy when the area used to set exposure is much brighter
or darker than its surroundings.
1
Select [Center-weighted metering] or [Spot
metering] (
0
178).
2
With the subject positioned in
the selected focus point and
the shutter-release button
pressed halfway, press the
center of the sub-selector to
lock exposure.
•
While the center of the sub-selector
is pressed, exposure will lock at the
value metered in an area of the subject determined by the
selected metering option.
•
An AE-L icon will be displayed in
the viewfinder.