Nikon D100 - Manual (Page 68)

Taking Photographs—White Balance
White Balance
56
Measuring Preset White Balance
To measure a value for preset white balance:
1 Place a neutral gray or white object under the lighting that will be used in
the final photograph.
2 Set the function dial to WB. If preset white balance is not selected, rotate
the main command dial until PRE appears in the control panel.
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3 Rotate the sub-command dial. A flashing will appear in the exposure-
count displays, and the PRE icon in the control panel will flash.
4 The camera will be set to the exposure mode chosen in the WB Preset >
Exposure Mode menu; adjust focus, exposure, and flash settings. Note
that settings that would result in extreme under- or over-exposure could
prevent the camera from measuring a value for white balance. Under
studio lighting, use an 18% diffusion panel to make the reference object
appear gray. If you are using a white object as the reference for setting
white balance, exposure should be set to a value that would cause the
reference object to appear gray.
Use Manual Focus
When measuring preset white balance the focus-mode selector to M (manual focus;
74) and focus manually. At a setting of single-servo autofocus, lack of contrast may
prevent the camera focusing on a neutral gray reference object, and the shutter-release
will be disabled.