Canon EOS-1D X Mark II DSLR Camera (Body Only) - Manual (Page 404)

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Whenever you set the power switch to < 1 / R > or < 2 >, the
Self Cleaning Sensor Unit is activated to automatically shake off the
dust on the front of the sensor. Normally, you need not pay attention to
this operation. However, you can manually perform sensor cleaning or
can disable this unit as follows.
1
Select [Sensor cleaning].
Under the [ 5 3 ] tab, select [ Sensor
cleaning ], then press < 0 >.
2
Select [Clean now f ].
Select [ Clean now f ], then press
< 0 >.
Select [ OK ].
X The screen will indicate that the sensor is being cleaned. (A small sound
may be heard.) Although there will be a mechanical sound of the shutter
during sensor cleaning, the picture will not be recorded to the card.
X After sensor cleaning is finished, the camera will automatically turn
off and on.
In step 2, select [ Auto cleaning f ] and set it to [ Disable ].
X The sensor cleaning will no longer be performed when you set the
power switch to <
1 / R > or < 2 >.
f
Automatic Sensor Cleaning
Cleaning the Sensor Now
Disabling Automatic Sensor Cleaning
For best results, perform the sensor cleaning with the camera placed
upright and stable on a table or other flat surface.
Even if you repeat the sensor cleaning, the result will not improve much.
Immediately after the sensor cleaning is finished, the [
Clean now f ]
option remains disabled temporarily.
Dots of light may appear on images if the sensor has been affected by
cosmic rays, etc. By selecting [
Clean now f ], their appearance may
be suppressed (p.520).