Canon 5D Mark III User Manual (en)

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Attaching and Detaching a Lens
To zoom, turn the zoom ring on the lens 
with your fingers.
If you want to zoom, do it before 
focusing. Turning the zoom ring after 
achieving focus may throw off the 
focus slightly.
While pressing the lens release 
button, turn the lens as shown by 
the arrow.
 
Turn the lens until it stops, then 
detach it.
 
Attach the rear lens cap to the 
detached lens.
About Zooming
Minimizing Dust
 
When changing lenses, do it quickly in a place with minimal dust.
 
When storing the camera without a lens attached, be sure to attach the 
body cap to the camera.
 
Remove dust on the body cap before attaching it.
Detaching the Lens