Nikon D800 User Manual (en)

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U
When calculating exposure, center-weighted 
metering assigns the greatest weight to a 
circle in the center of the frame. The 
diameter (
φ) of this circle can be set to 8, 12, 
15, or 20 mm or to the average of the entire 
frame.
Note that unless Average is selected, the diameter is fixed at 
12 mm when a non-CPU lens is used, regardless of the setting 
selected for Non-CPU lens data in the setup menu (
212). When 
Average is selected, the average of the entire frame will be used for 
both CPU and non-CPU lenses.
A
Show ISO/Easy ISO
Custom Setting b4 (Easy exposure compensation) can not be used 
with Custom Setting d7 (ISO display and adjustment) > Show ISO/
Easy ISO
 (
0 295). Adjustments to either of these items reset the 
remaining item; a message is displayed when the item is reset.
b5: Center-Weighted Area
G button
➜ A Custom Settings menu