Nikon 13187 User Guide (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 (
172). 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.
If On is selected, exposure will lock when the shutter-release 
button is pressed halfway.
b4: Center-Weighted Area
G button
➜ A Custom Settings menu
b5: Fine-tune Optimal Exposure
G button
➜ A Custom Settings menu
D
Fine-Tuning Exposure
Exposure fine-tuning 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 
(
0 112) is preferred in most situations.
c: Timers/AE Lock
c1: Shutter-Release Button AE-L
G button
➜ A Custom Settings menu