Nikon D3X - Manual (Page 379)

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Dust off Ref Photo
Acquire reference data for the Image Dust Off option in
Capture NX 2 (available separately; for more information, see the
software manual).
[Dust off ref photo] is available only when a CPU lens is mounted
on the camera. A non-DX lens with a focal length of at least 50 mm
is recommended. When using a zoom lens, zoom all the way in.
1
Select [Start].
Highlight [Start] and press J.
The message shown at right will be
displayed and “rEF” will appear in the
viewfinder and top control panel. To exit
without acquiring image dust off data,
press
G.
2
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 halfway.
In autofocus mode, focus will automatically be set to infinity;
in manual focus mode, set focus to infinity manually.