Nikon D300 User Manual (en)

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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.