Nikon D3S - Manual (Page 187)

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4
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 preset
d-0. No photograph will be recorded; white balance can be
measured accurately even when the camera is not in focus.
5
Check the results.
If the camera was able to measure a
value for white balance, C will flash
in the control panels for about six
seconds, while the viewfinder will show
a flashing
a.
If lighting is too dark or too bright, the
camera may be unable to measure
white balance. A flashing
b a will
appear in the control panels and
viewfinder for about six seconds. Press
the shutter-release button halfway to
return to Step 4 and measure white
balance again.
Top control panel
Rear control panel
Viewfinder
Top control panel
Rear control panel
Viewfinder