Nikon D700 - Manual (Page 320)

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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. 210).
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.
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
y φ
12 mm (default)
z φ
15 mm
0 φ
20 mm
P
Average