Nikon D4S - Manual (Page 185)

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❚❚The U Button
The U button can be used to select the color temperature for the
amber (A)–blue (B) axis only. Press the U button and rotate the
sub-command dial until the desired value is displayed in the rear
control panel (adjustments are made in mireds;
0 160). To enter a
color temperature directly in increments of 10 K, press the U
button and press 4 or 2 to highlight a digit and press 1 or 3 to
change.
U button Sub-command dial
Rear control panel