Nikon D90 - Manual (Page 198)

178
L
b3: Center-Weighted Area
b4: Fine Tune Optimal Exposure
Use this option (available in all shooting modes) 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.
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 (pg. 90) is preferred in most situations.
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 6, 8, or
10 mm. This option is available in P, S, A, and M modes only.
Option
M φ 6 mm
L φ 8 mm (default)
N φ 10 mm