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

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The file name has four alphanumeric 
characters followed by a four-digit 
image number (p.223) and extension. 
The first four alphanumeric characters 
are set upon factory shipment and unique to the camera. However, you 
can change them.
With “User setting1”, you can change and register the four characters 
as desired. With “User setting2”, if you register three characters, the 
fourth character from the left will be appended automatically to indicate 
the image size (image-recording quality).
1
Select [File name].
 
Under the [51] tab, select [File 
name
], then press <0>.
2
Select [Change User setting*].
3
Enter any alphanumeric 
characters.
 
For User setting1, enter four 
characters. For User setting2, enter 
three characters.
 
Press the <L> button to delete any 
unnecessary characters.
3
 Changing the File Name
Registering or Changing the File Name
(Example) 
BE3B0001.JPG
Character palette