Nikon COOLPIX S810c Product Manual - Page 182
Button, Choose color temp., Preset, manual
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❚❚ The U Button At settings other than K (Choose color temp.) and L (Preset manual), the U button can be used to fine-tune white balance on the amber (A)-blue (B) axis (0 159; to fine-tune white balance when L is selected, use the shooting menu as described on page 158). Press the U button and rotate the sub-command dial to fine-tune white balance in steps of 0.5 (with each full increment equivalent to about 5 mired) until the desired value is displayed in the rear control panel. Rotating the sub-command dial to the left increases the amount of amber (A). Rotating the sub-command dial to the right increases the amount of blue (B). At settings other than 0, an asterisk ("U") appears in the rear control panel. U button Rear control panel Sub-command dial A White Balance Fine-Tuning The colors on the fine-tuning axes are relative, not absolute. For r example, moving the cursor to B (blue) when a "warm" setting such as J (Incandescent) is selected for white balance will make photographs slightly "colder" but will not actually make them blue. A "Mired" Any given change in color temperature produces a greater difference in color at low color temperatures than it would at higher color temperatures. For example, a change of 1000 K produces a much greater change in color at 3000 K than at 6000 K. Mired, calculated by multiplying the inverse of the color temperature by 10 6, is a measure of color temperature that takes such variation into account, and as such is the unit used in color-temperature compensation filters. E.g.: • 4000 K-3000 K (a difference of 1000 K)=83 mired • 7000 K-6000 K (a difference of 1000 K)=24 mired 160