Canon 2530A004 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 quick and quiet
autofocusing.

4. Manual focusing is available after the subject
comes into focus in autofocus mode (ONE
SHOT AF).

5. The lens is compatible with Extender EF1.4X ll
and EF2X ll.

* Based on [1/focal length] second. Generally, it requires

a shutter speed [1/focal length] second or faster to
prevent camera shake.

Thank you for purchasing a Canon product.

Conventions used in this instruction

Warning to prevent lens or camera malfunction
or damage.

Supplementary notes on using the lens and
taking pictures.

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a Safety Precautions

a Safety 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, 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 could cause a fire.

Handling Cautions

• If the lens is taken from a cold environment into

a warm one, condensation may develop on the
lens surface and internal parts. To prevent

condensation in this case, first put the lens into an
airtight plastic bag before taking it from a cold to
warm environment.Then take out the lens after it
has warmed gradually. Do the same when taking
the lens from a warm environment into a cold one.

• Do not leave the lens in excessive heat such as in
a car in direct sunlight. High temperatures can

cause the lens to malfunction.

This device complies with Part 15 of the FCC Rules.Operation is
subject to the following two conditions:(1) This device may not
cause harmful interference, and (2) this device must accept any
interference received, including interference that may cause
undesired operation.
Do not make any changes or modifications to the equipment
unless otherwise specified in the instructions. If such changes or
modifications should be made, you could be required to stop
operation of the equipment.
This equipment has been tested and found to comply with the
limits for a class B digital device, pursuant to part 15 of the FCC
Rules.These limits are designed to provide reasonable protection
against harmful interference in a residential installation.This
equipment generates, uses and can radiate radio frequency
energy and, if not installed and used in accordance with the
instructions, may cause harmful interference to radio
communications.
However, there is no guarantee that interference will not occur in
a particular installation. If this equipment does cause harmful
interference to radio or television reception, which can be
determined by turning the equipment off and on, the user is
encouraged to try to correct the interference by one or more of
the following measures:

• Reorient or relocate the receiving antenna.

• Increase the separation between the equipment and receiver.

• Consult the dealer or an experienced radio/TV technician for
help.

This Class B digital apparatus complies with Canadian ICES-003.

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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)

For 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 with the dust
cap.To attach it properly, align the lens mount
index and the

K

index of the dust cap as shown
in the diagram, and turn clockwise.To remove it,
reverse the order.

1.

Mounting and Detaching the Lens

2.Setting the Focus
Mode

After autofocusing in ONE SHOT AF mode, focus
manually by pressing the shutter button halfway
and turning the focusing ring. (Full-time manual
focus)

To shoot in autofocus (AF) mode, set the focus
mode switch to AF.
To use only manual focusing (MF), set the focus
mode switch to MF, and focus by turning the
focusing ring.The focusing ring always works,
regardless of the focus mode.

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