Canon MARK IV User Manual (en)

 Appending Dust Delete Data
Photograph a solid-white object.
At a distance of 20 cm - 30 cm / 0.7 ft. 
- 1.0 ft., fill the viewfinder with a 
patternless, solid-white object and 
take a picture.
The picture will be taken in the aperture-
priority AE mode with an aperture of f/22.
Since the image will not be saved, the 
data can still be obtained even if there 
is no card in the camera.
When the picture is taken, the camera 
will start obtaining the Dust Delete Data. 
When the Dust Delete Data is obtained, 
a message will appear.
Select [OK], and the menu will reappear.
If the data was not obtained 
successfully, a message to that effect 
will appear. Follow the “Preparation” 
procedure on the preceding page, then 
select [OK]. Take the picture again.
After the Dust Delete Data is obtained, it is appended to all the JPEG 
and RAW images captured thereafter. Before an important shoot, you 
should update the Dust Delete Data by obtaining it again.
To erase dust spots automatically with the provided software, see the 
Software Instruction Manual in the CD-ROM.
The Dust Delete Data appended to the image is so small that it hardly 
affects the image file size.
About the Dust Delete Data
Be sure to use a solid-white object such as a new sheet of white paper. If the 
paper has any pattern or design, it may be recognized as dust data and 
affect the accuracy of the dust deletion with the software.