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

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The camera is compatible with all Canon EF lenses. The camera 
cannot be used with EF-S or EF-M lenses.
1
Remove the caps.
 
Remove the rear lens cap and the 
body cap by turning them as shown 
by the arrows.
2
Attach the lens.
 
Align the red mount index on the lens 
with the red mount index on the 
camera and turn the lens as shown by 
the arrow until it clicks in place.
3
Set the lens’s focus mode switch 
to <AF>.
 
<AF> stands for autofocus.
 
<MF> stands for manual focus. 
Autofocus will not operate.
4
Remove the front lens cap.
Attaching and Detaching a Lens
Attaching a Lens