Nikon D3s Body Only D3S User's Manual - Page 330

b5: Center-Weighted Area G button ➜ A Custom Settings menu 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. b6: Fine Tune Optimal Exposure G button ➜ A Custom Settings menu 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. 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 finetuning menu. Exposure compensation (0 134) is preferred in most situations. U 304