Nikon D3x Manuel D’Utilisation

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b5: Center-Weighted Area
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 (pg. 218). 
When [Average] is selected, the average of the entire frame will be 
used for both CPU and non-CPU lenses.
b6: Fine Tune Optimal Exposure
Use this option to fine-tune the exposure value selected by the 
camera. Exposure can be fine tuned separately for each metering 
method by from +1 to –1 EV in steps of 
1
/
6
EV.
1
Select Custom Setting b6.
Highlight Custom Setting b6 
([Fine tune optimal exposure]) 
and press 
2.
2
Select [Yes].
The message shown at right 
will be displayed; highlight 
[Yes] and press 
2 to proceed, 
or select [No] to exit without 
altering exposure.
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.
Option
L
φ  8 mm
M
φ 12 mm (default)
N
φ 15 mm
O
φ 20 mm
Average