Canon RF 100-400mm F5.6-8 IS USM Instructions Manual page 10

4. Fixing the Zoom Ring
The zoom ring can be fixed to keep the lens at the shortest point. This function is convenient for
carrying a camera on a strap because it prevents the lens from extending.
1
Turn the zoom ring to
the wide end position
(100 mm).
The zoom ring cannot be fixed in place at any position other than
z
the wide end position.
2
Slide the zoom ring lock
lever in the direction
indicated by the arrow.
To release the zoom ring, slide
z
the zoom ring lock lever in the
direction opposite to the arrow.
ENG-9