Canon 10x42L IS WP Instructions Manual page 5

Maintaining Waterproof Property
The binoculars are waterproof. To make full use of this performance,
make sure to check the O-ring in the battery chamber and the contact
surface. If you close the battery chamber cover when it is covered
with sand, hair or other materials, the waterproof property will be lost,
allowing water to enter, resulting in malfunction.
O-ring
Contact surface
Cotton swab
(commercial product)
Do not forcefully pull or extend the O-ring.
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The O-ring is specially treated. Be careful not to apply grease or allow
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oil to accidentally come into contact with it.
Do not remove the O-ring. That may result in scratching the surface,
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allowing water to enter.
If the O-ring is broken, cut or distorted, or if more than two years have
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passed since you purchased the binoculars, bring them to a Canon
Service Center to have the O-ring replaced. It is recommended to
replace the O-ring every two years (for a fee).
If you use the binoculars in a sandy or dusty environment, it is
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recommended to replace the O-ring every year.
1
Check the O-ring.
Make sure that the O-ring and the
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contact surface are not distorted or
covered with dust.
2
Clean the O-ring.
If there is dust on the O-ring and the
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contact surface, use a damp cotton
swab or similar material to remove the
dust.
ENG-4