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Canon EOS 5D Mark III with L-Series Zoom Lens Owner's Manual

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Dust that could not be removed by the automatic sensor cleaning can 
be removed manually with a blower, etc. Before cleaning the sensor, 
detach the lens from the camera.
The surface of the image sensor is extremely delicate. If the 
sensor needs to be cleaned directly, having it done by a Canon 
Service Center is recommended.
1
Select [Sensor cleaning].
 
Under the [53] tab, select [Sensor 
cleaning], then press <
0>.
2
Select [Clean manually].
 
Select [Clean manually], then press 
<
0>.
3
Select [OK].
 
Select [OK], then press <
0>.
X
In a moment, the reflex mirror will 
lockup and the shutter will open.
 
“CLn” will blink on the LCD panel.
4
Clean the sensor.
5
End the cleaning.
 
Set the power switch to <2>.
3
 Manual Sensor CleaningN
If you use a battery, make sure it is fully charged. If the battery grip with size-
AA/LR6 batteries is attached, manual sensor cleaning will not be possible.
As power source, using the AC Adapter Kit ACK-E6 (sold separately) is 
recommended.