Canon EOS-1D X Mark II DSLR Camera (Body Only) - Manual (Page 405)

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Normally, the Self Cleaning Sensor Unit will eliminate most of the dust
that may be visible on captured images. However, in case visible dust
still remains, you can append the Dust Delete Data to the image for
erasing the dust spots later. The Dust Delete Data is used by Digital
Photo Professional (EOS software, p.552) to erase the dust spots
automatically.
Prepare a solid white object such as a sheet of paper.
Set the lens focal length to 50 mm or longer.
Set the lens’s focus mode switch to < MF > and set the focus to
infinity ( ∞ ). If the lens has no distance scale, rotate the camera to
face toward you and turn the focusing ring clockwise all the way.
1
Select [Dust Delete Data].
Under the [ z 3 ] tab, select [ Dust
Delete Data ], then press < 0 >.
2
Select [OK].
X After the automatic self-cleaning of
the sensor is performed, a message
will appear. Although there will be a
mechanical sound of the shutter,
during the cleaning, no picture is
taken.
3
Appending Dust Delete Data
Preparation
Obtaining the Dust Delete Data