Nikon D810 - Manual (Page 184)

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3
Select a preset.
Press the U button and rotate the sub-command dial until
the desired white balance preset (d-1 to d-6) is displayed in
the control panel.
4
Select direct measurement mode.
Release the U button briefly and
then press the button until the L
icon in the control panel starts to
flash. A flashing D will also
appear in the viewfinder. The
displays will flash for about six
seconds.
U
button Sub-command
dial
Control panel
Control panel
Viewfinder