Canon EOS 5D Mark IV L-series Zoom Lens Kit Owner's Manual

Page of 865
457
12
Sensor Cleaning
The camera has a Self Cleaning Sensor Unit to 
automatically shake off dust adhered to the image 
sensor’s front layer (low-pass filter).
The Dust Delete Data can also be appended to the 
image so that the dust spots remaining can be deleted 
automatically by Digital Photo Professional (EOS 
software, p.598).
Smudges adhering to the front of the sensor
Besides dust entering the camera from outside, in rare cases, 
lubricant from the camera’s internal parts may adhere to the front of 
the sensor. If visible spots still remain after the automatic sensor 
cleaning, having the sensor cleaned by a Canon Service Center is 
recommended.