Nikon D750 DSLR Camera (Body Only) - Manual (Page 187)

159
Live View (Spot White Balance)
In live view photography and movie live view ( 0 54, 66), white
balance can be measured in a selected area of the frame,
eliminating the need to prepare a reference object or change
lenses during telephoto photography.
1
Press the a button.
The mirror will be raised and the view
through the lens will be displayed in
the camera monitor.
2
Set white balance to L (Preset manual).
Press the L ( U ) button and rotate the main command dial
until L is displayed in the monitor.
L ( U ) button Main command
dial
Monitor
a button