Nikon D3S User Manual page 182

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 (0 154; to fine-tune white balance
when K or L is selected, use the shooting menu as described on
page 153). Six settings in both directions are available; each
increment is equivalent to about 5 mired (0 155). Press the WB
button and rotate the sub-command dial 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, a E icon appears in the rear control
panel.
Rear control panel
WB button Sub-command dial
r
156