Canon lens EF 300mm f4L IS USM User Manual

EF300mm f/4L IS USM
Instruction
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The Canon EF300mm f/4L IS USM lens is a
high-performance telephoto zoom lens for EOS
cameras, and it is equipped with an Image
Stabilizer.
• IS stands for Image Stabilizer.
• USM stands for Ultrasonic Motor.
Features
1. The Image Stabilizer gives the equivalent
effect of a shutter speed two stops faster*.
The lens also has a second image stabilizer
mode that is optimized for following shots of
moving subjects.
2. UD lens elements for excellent imaging performance.
3. Ultrasonic motor (USM) for...

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aSafety Precautions
aSafety Precautions•Do not look at the sun or a bright light source
through the lens or camera. Doing so could result
in loss of vision. Looking at the sun directly through
the lens is especially hazardous.
•Do not point the lens or camera at the sun or
photograph it. This is because the lens
concentrates the sun’s rays even when the sun is
outside the image area or when shooting with
backlight, which could cause malfunction or fire.
•Whether it is attached to the camera or not,...

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Nomenclature
Built-in lens hood (→ 10)
Filter mounting
thread (→ 10) Focusing ring (→ 4)
Focusing distance range selection 
switch (→ 5)
Image stabilizer switch (→ 6)
Image stabilizer mode selector switch 
(→ 6) Focus mode switch (→ 4)
Distance scale (→ 5)
Contacts (→ 4)
Tripod mount (→ 9) Lens mount index (→ 4)
Orientation locking knob (→ 9)Distance index (→ 5)
F or detailed information, reference page numbers are provided in parentheses (→ **).
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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...

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4.Infinity Compensation Mark
To  compensate for shifting of the infinity focus
point that results from changes in temperature.
The infinity position at normal temperature is the
point at which the vertical line of the L mark is
aligned with the distance indicator on the
distance scale.
F or accurate manual focusing on subjects at
infinity distance, look through the viewfinder while
rotating the focusing ring.
Infinity compensation mark
Distance index
You can set the focusing distance range to 
1.5...

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Y
ou can use the image stabilizer in AF or MF mode.
5. Image Stabilizer Settings
Select the stabilizer mode.
• MODE 1: Corrects vibrations
in all directions. It is mainly
effective for shooting still
subjects.
• MODE 2: It compensates for
ver tical camera shake during
f ollowing shots in a horizontal
direction, and compensates for
horizontal camera shake
during following shots in a
ver tical direction.
When you press the shutter
button halfway, the Image
Stabilizer will start
operating.
• Make sure...

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6. Tips on Using the Image Stabilizer
•In semi-darkened areas such as indoors or
outdoors at night.
• In locations where flash photography is
prohibited, such as art museums and theater
stages.
• In situations where your footing is uncertain.
•I n situations where fast shutter settings cannot
be used. •
When panning subjects in motion.
● MODE 1 ●MODE 2
The image stabilizer in this lens is effective for hand-held shots under the following conditions.
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Tips on Using the Image Stabilizer
•The Image Stabilizer cannot compensate for a
blurred shot caused by a subject that moved.
•
Set the STABILIZER switch  when you are
using a tripod. If the Stabilizer switch is set to ,
the image stabilizer function may introduce errors.
•Set the STABILIZER switch to  when you are
taking pictures using the Bulb setting (long
e xposures). If the STABILIZER switch is set to ,
the image stabilizer function may introduce errors.
• The Image Stabilizer might not be...

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7. Using the Tripod Mount
Adjusting the Revolving MountYou can loosen the orientation lock-knob on the tripod mount to allow it to rotate as needed to fit a
particular camera model for switching between vertical and horizontal positions.
DetachingUse the following procedures to remove and attach the tripod mount.
Loosen the orientation
locking knob.
Rotate the tripod mount and
align the mounting indicator
on the tripod mount with the
one on the lens.Slide off the tripod collar
away  from the rear...