Nikon D90 user manual WB Button, Press J, Mired

3Press 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 Eicon 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 Kor Lis 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 sub- command 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 sub- command dial to the right increases the amount of blue (B). At settings other than 0, a Eicon 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

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