Nikon d3s User Manual (en)

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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 (
0 214
). When 
Average is selected, the average of the entire frame will be used for 
both CPU and non-CPU lenses.
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.
b5: Center-Weighted Area
G button
➜ A Custom Settings menu
b6: Fine Tune Optimal Exposure
G button
➜ A Custom Settings menu
D
Fine-Tuning Exposure
Exposure can be fine-tuned separately for each Custom Settings bank 
and is not affected by two-button resets. Note that as the exposure 
compensation (
E) icon is not displayed, the only way to determine how 
much exposure has been altered is to view the amount in the fine-
tuning menu. Exposure compensation (
0 134) is preferred in most 
situations.