Nikon EN-EL3e D90 User's Manual - Page 118
The WB Button, Choose color temp., Preset manual
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3 Press J. Press J to save settings and return to the shooting menu. If white balance has been fine-tuned on the A-B axis, a E icon will be displayed in the control panel. ❚❚ The WB Button At settings other than K (Choose color temp.) and L (Preset manual), the WB button can be used to fine-tune white balance on the amber (A)-blue (B) axis (pg. 97; t to fine-tune white balance when K or L is selected, use the shooting menu as described on page 97). Six settings in both directions are available; each increment is equivalent to about 5 mired (see below). Press the WB button and rotate the subcommand dial until the desired value is displayed in the control panel. Rotating the sub-command dial to the left increases the amount of amber (A). Rotating the subcommand dial to the right increases the amount of blue (B). At settings other than 0, a E icon appears in the control panel. WB button Sub-command dial Control panel 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 98