Nikon D300 - Manual (Page 346)

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3
Acquire dust off reference data.
Press the shutter-release button the rest of the way down to
acquire Image Dust Off reference data. The monitor turns off
when the shutter-release button is pressed.
If the reference object is too bright or too
dark, the camera may be unable to
acquire Image Dust Off reference data
and the message shown at right will be
displayed. Choose another reference
object and repeat the process from
step 1.
D
Image Dust Off Reference Data
The same reference data can be used for
photographs taken with different lenses or at
different apertures. Reference images can not be
viewed using computer imaging software. A grid
pattern is displayed when reference images are
viewed on the camera; histograms and highlights
are not displayed.