Rubber Ring; Contacts; Lens Mount Index; Mounting And Detaching The Lens - Canon EF28-300mm f/3.5-5.6L IS USM Instruction

1. Mounting and Detaching the Lens

See your camera's instructions for details on
mounting and detaching the lens.
• After detaching the lens, place the lens with the
rear end up to prevent the lens surface and
electrical 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
K index of the dust cap as shown in the
and the
diagram, and turn clockwise. To remove it, reverse
the order.
The lens mount has a rubber ring for enhanced
water- and dust-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.
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