Canon f-4L User Manual
EF300mm F4L IS USM
Instruction
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Thank you for purchasing a Canon product.
Developed for Canon EOS cameras, the Canon EF 300mm f/4L IS Ultrasonic lens is an
interchangeable SLR lens equipped with a dual-mode Image Stabilizer (IS). The Image Stabilizer
reduces blur caused by camera shake approximately two full shutter speeds compared to normal
handheld shooting.
Features
1. The Image Stabilizer operates by moving optical elements inside the lens. Features include:
•A special mode provided to obtain steadier viewfinder images during panning etc.
•A switch turns the Image Stabilizer circuit on and off.
2. Two UD-glass elements suppress chromatic aberrations for sharp, high-contrast images expected of
an L-series lens.
3. Ultrasonic Motor (USM) for quiet autofocusing.
4. Wide focusing ring makes manual focusing easy.
5. Minimum focusing distance of 1.5 m / 4.9 ft.
6. Compatible with Extender EF 1.4× ll and EF 2× ll.
7. The Image Stabilizer can be used while an Extender is attached (except with certain EOS cameras).
: Warning to prevent malfunction or a flawed photo. : Helpful tips.
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a Safety Precautions
(1) Whether it is attached to the camera or not, do not leave the lens under the sun without the
lens cap attached.
This is to prevent the lens from concentrating the sun’s rays which can cause a fire.
(2) Do not look at the sun or a bright light source through the lens or camera.
Doing so can result in loss of vision. Looking at the sun through the detached lens is especially
hazardous.
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Nomenclature
STABILIZER MODE
1
2
STABILIZER
IO
AF
MF
•1.5m –
•3m –
Built-in hood
Focusing ring
Image Stabilizer switch
Image Stabilizer mode switch
Focus mode switch
Lens mount index
Distance range limiter switch
Contacts
Distance scale window
Tripod collar mount
Tripod collar index
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• 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.
■ Attaching the lens to
the camera
Remove the lens dust cap
by turning it
counterclockwise.
Align the lens mount index
with the red dot on the
camera. Then turn the lens
clockwise until it locks in
place.
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.
1.
Attaching and
Detaching the Lens
1
2
3
MF
AF
STABILIZER MODE
2
1
IO
STABILIZER
CANON
STABILIZER MODE
STABILIZER
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