Nikon D750 DSLR Camera (Body Only) - Manual (Page 178)

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Press J .
Press J to save settings and return to the shooting menus.
❚❚
The L ( U ) Button
At settings other than K ( Choose color temp. ) and L ( Preset
manual ), the L ( U ) button can be used to fine-tune white
balance on the amber (A)–blue (B) axis ( 0 149; to fine-tune
white balance when L is selected, use the shooting menus as
described on page 164). Press the L ( 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 control panel and information
display. 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).
L ( U ) button Sub-command
dial
Control panel
Information display