Canon 2746B002 User Manual

EF800mm f/5.6L IS USM

Instruction

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Designed for EOS cameras, the EF800mm
f/5.6L IS USM is a high-performance super­telephoto lens 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 four stops faster*.
The lens also has a second image stabilizer
mode that is optimized for following shots of
moving subjects.

2. The lens features outstanding image quality
through the use of fluorite, super UD, and UD
lens elements.

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 AF Stop button for stopping the AF
operation at anytime.

6. Focus preset enables you to focus instantly at
a preset distance.

7. A truly round aperture hole results in a nicer
background blur.

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

9. Tight seal structure ensures excellent dust­proof and drip-proof performance.

10

. Designed for lighter weight with major parts

made of magnesium alloy.

* 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.

• Do not stand on the lens case. Falling off the case
could result in injury.

• Do not stack lens cases. A falling lens case could
cause an injury.

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

Orientation locking knob (→ 14)

Lens mount index (→ 4)

Distance scale (→ 6)

Drop-in filter (→ 12)

Strap mount (→ 4)

Contacts (→ 4)

Focus mode switch (→ 5)

Focusing distance range selection switch (→ 5)

Image stabilizer mode selector switch (→ 9)

Focus preset button (→ 8)

Focus preset switch (→ 8)

Image stabilizer switch (→ 9)

Tripod mount (→ 14)

AF stop button (→ 7)

Playback ring (→ 8)

Focusing ring (→ 5)

Rubber ring (→ 4)

Hood mount (→ 6)

For detailed information, reference page numbers are provided in parentheses (→ **).

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• 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.

Thread the end of the strap through the strap
mount on the lens and then back through the
clasp on the strap.Pull the strap tight and check
that there is no slack in the clasp.

Attaching the strap

See your camera’s instructions for details on
mounting and detaching the lens.

1.Mounting and Detaching the Lens

The lens mount has a rubber ring for enhanced
water- and dust-resistance.The rubber ring may
cause slight abrasions around the camera's lens
mount, but this will not cause any problems.If the
rubber ring becomes worn, it is replaceable by a
Canon Service Center at cost.

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

You can set the focusing distance range at
6m/19.7ft. to infinity, 6m/19.7ft. - 20m/65.6ft., or
20m/65.6ft. to infinity.
By setting the suitable focusing distance range,
the actual autofocusing time can be shorter.

3.

Switching the Focusing
Distance Range

2.Setting the Focus
Mode

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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