Press the WB button and rotate the main command
dial until is displayed in the rear
control panel or viewfinder sidebar
If the new value for preset white balance will be used immediately, select
preset d-0 by pressing the WB button and rotating the sub-command dial
until d-0 is displayed in the rear control panel ( 64). Otherwise there is
no need to select d-0 when measuring a new value for white balance
Release the WB button briefly and then press
the button until the icon in the rear control
panel and viewfinder sidebar start to fl ash. A
blinking will also appear in the top control
panel and viewfinder frame-count displays
To measure white balance using a neutral gray or white object…
…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.
To measure the color of the light source…
…make sure that the ambient light sensor is
lit by the light source and press the FUNC.
button. The camera will calculate a value for
white balance and store it in preset d-0.
This can be found on page 61 of the D2Xs manual. You can download a copy of the manual from http://support.nikonusa.com I suggest using this rather than the UK site because they don't expect you to have registered a product before you can access manuals.