Canon EOS 5D Mark III with L-Series Zoom Lens Owner's Manual

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The camera is compatible with all Canon EF lenses. The camera 
cannot be used with EF-S 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 dots on the lens and 
camera and turn the lens as shown by 
the arrow until it clicks in place.
3
Set the lens focus mode switch to 
<AF>.
 
<AF> stands for Autofocus.
 
If it is set to <MF> (manual focus), 
autofocus will not operate.
4
Remove the front lens cap.
Attaching and Detaching a Lens
 
Do not look at the sun directly through any lens. Doing so may cause 
loss of vision.
 
If the front part (focusing ring) of the lens rotates during autofocusing, do 
not touch the rotating part.