Nikon D330018-55VR User Manual (en)

The Setup Menu: Camera Setup
Frame a featureless white object in the viewfinder.
With the lens about ten centimeters (four inches) from a well-
lit, featureless white object, frame the object so that it fills the 
viewfinder and then press the shutter-release button 
In autofocus mode, focus will automatically be set to infinity; 
in manual focus mode, set focus to infinity manually.
Acquire Image Dust Off reference data.
Press the shutter-release button the rest of the way down to 
acquire Image Dust Off reference data.
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.
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.