Nikon D3100 - Manual (Page 108)

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Measuring Preset White Balance
If no operations are performed while the displays are flashing, direct measurement mode
will end when the exposure meters turn off. The auto meter-off delay can be changed using
the Auto off timers option in the setup menu (
0 143). The default setting is eight seconds.
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Preset White Balance
The camera can store only one value for preset white balance at a time; the existing value will
be replaced when a new value is measured. Note that exposure is automatically increased
by 1 EV when measuring white balance; when shooting in mode M, adjust exposure so that
the exposure indicator shows ±0 (
0 77).
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Other Methods for Measuring Preset White Balance
To enter preset measurement mode (see above) after selecting preset white balance in the
information display (
0 87), press J for a few seconds. If white balance has been assigned to
the Fn button ( 0 146) and preset white balance selected by pressing the Fn button and
rotating the command dial, the camera will also enter preset measurement mode if the Fn
button is pressed for a few seconds.
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Studio Settings
In studio settings, a standard gray panel can be used as a reference object when measuring
preset white balance.