Nikon D6 - Exposure Compensation

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Exposure-Related Settings (Metering and Exposure Compensation)
Exposure Compensation
Exposure compensation is used to alter exposure from the value
suggested by the camera. It can be used to make pictures
brighter or darker. It is most effective when used with [Spot
metering] or [Center-weighted metering] (
0
178).
−1 EV No exposure
compensation
+1 EV