Canon EF 24-70mm f2.8L II USM - Manual (Page 6)

ENG-5
1. Mounting and Detaching the Lens
See your camera’s instructions for details on
mounting and detaching the lens.
The lens mount has a rubber ring for enhanced
dust- and water-resistance. The rubber ring may
cause slight abrasions around the camera’s lens
mount, but this will not cause any problems. If the
rubber ring becomes worn, it is replaceable by a
Canon Service Center at cost.
● ● After detaching the lens, place the lens with
the rear end up to prevent the lens surface and
contacts from getting scratched.
● ● If the contacts get soiled, scratched, or have
fingerprints on them, corrosion or faulty
connections can result. The camera and lens
may not operate properly.
● ● If the contacts get soiled or have fingerprints on
them, clean them with a soft cloth.
● ● If you remove the lens, cover it with the dust
cap. To attach it properly, align the lens mount
index and the  index of the dust cap as shown
in the diagram, and turn clockwise. To remove it,
reverse the order.
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