Nikon D810 - Manual (Page 185)

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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.
6
Check the results.
If the camera was able to measure a
value for white balance, C will
flash in the control panel 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
panel and viewfinder for about six
seconds. Press the shutter-release
button halfway to return to Step 5
and measure white balance again.
Control panel
Viewfinder
Control panel
Viewfinder