Nikon D750 User Manual page 185

4
Select direct measurement mode.
Release the L (U) button briefly
and then press the button until D
starts to flash in the 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.
A
Protected Presets
If the current preset is protected (0 164), 3 or Prt will flash in the
control panel, viewfinder, and information display if you attempt to
measure a new value.
Control panel
Viewfinder
157