Nikon D300S User Manual page 170

Measuring a Value for White Balance
1
Light a reference object.
Place a neutral gray or white object under the lighting that will
be used in the final photograph. In studio settings, a standard
gray panel can be used as a reference object. Note that
exposure is automatically increased by 1 EV when measuring
white balance; in exposure mode h, adjust exposure so that
the exposure indicator shows ±0 (0 113).
2
Set white balance to L (Preset manual).
Press the WB button and rotate the main command dial until
L is displayed in the control panel.
WB button
3
Select direct measurement mode.
r
Release the WB button briefly and then
press the button until the L icon in
the control panel starts to flash. A
flashing D will also appear in the
control panel and viewfinder. The
displays will flash for about six seconds.
144
Main command dial
Control panel
Control panel
Viewfinder