Nikon D4S - Manual (Page 188)

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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 rear control panel.
4
Select direct measurement mode.
Release the U button briefly and then
press the button until the L icon in
the rear control panel starts to flash. A
flashing D will also appear in the top
control panel and viewfinder. The
displays will flash for about six seconds.
5
Measure white balance.
Before the indicators stop flashing, frame the
reference object so that it fills the viewfinder and
press the shutter-release button all the way down.
The camera will measure a value for white balance and store it
in the preset selected in Step 3. No photograph will be
recorded; white balance can be measured accurately even
when the camera is not in focus.
Rear control panel
U button Sub-command dial
Top control panel
Rear control panel
Viewfinder