Attaching And Detaching The Lens - Canon EF 300mm f/4L IS USM Instruction

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1. Attaching and
Detaching the Lens
■ Attaching the lens to
the camera
1
Remove the lens dust cap
by turning it
counterclockwise.
2
Align the lens mount index
with the red dot on the
camera. Then turn the lens
clockwise until it locks in
place.
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3
Remove the lens cap by
pressing both clasps.
■ Detaching the lens
Hold down the lens release
button on the camera and turn
the lens counterclockwise until
it detaches.
• After detaching the lens,
attach the dust cap to the rear
of the lens to protect the
electrical contacts and lens
surface from scratching.
• If the contacts are dirty,
scratched, or soiled with
fingerprints, etc., corrosion or
a faulty connection or
operation may result.
• If the lens surface is dirty, the
lens may not autofocus
properly.