Canon EOS 5D Mark III Instruction Manual (en)

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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 (provided software, p.394) 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 focus mode switch to <MF> and set the focus to infinity 
(
∞). If the lens has no distance scale, look at the front of the lens and 
turn the focusing ring clockwise all the way.
1
Select [Dust Delete Data].
 
Under the [z3] tab, select [Dust 
Delete Data
], then press <
0>.
2
Select [OK].
 
Select [OK] and press <
0>. After 
the automatic self-cleaning of the 
sensor is performed, a message will 
appear. Although there will be a 
shutter sound during the cleaning, no 
picture is taken.
3
 Appending Dust Delete DataN
Preparation
Obtain the Dust Delete Data