Canon EF 400mm f/4 DO IS II USM User Guide
EF400mm f/4 DO IS II USM
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Instructions
Thank you for purchasing a Canon product.
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Canon’s EF400mm f/4 DO IS II USM is a highperformance super telephoto lens, for use with EOS
cameras, which includes a newly-developed DO lens
(Gapless Dual-Layer Diffractive Optical Element) and
is designed to be compact and lightweight.
“DO” stands for Diffractive Optics.
“IS” stands for Image Stabilizer.
“USM” stands for Ultrasonic Motor.
Features
1. An optimal combination of DO elements
providing good compensation of chromatic
aberration and an aspherical element
providing good compensation of aberrations,
giving superior definition as well as achieving
compactness.
2. The Image Stabilizer gives the equivalent effect
of a shutter speed 4 stops* faster (when using
an EOS-1D X).
Also, a third Image Stabilizer mode effective for
shooting irregularly moving subjects.
3. SWC (Subwavelength Structure Coating)
reduces flare and ghosting.
4. Using a fluorine coating on the foremost and
rearmost lens surfaces allows adhered dirt to be
removed more easily than before.
5. Ultrasonic motor (USM) for fast, quiet autofocus.
6. Manual focusing is available after the subject
comes into focus in autofocus mode (ONE SHOT
AF).
7. An AF stop button to pause autofocus whenever
desired.
8. A power focus mode enables smooth focus
change.
9. A focus preset function for advance storage
of focusing positions in memory to allow
instantaneous focusing.
10. Can be used with EF1.4× III/EF2× III extenders.
11. Attachment slot provided for wire-type security
lock, located under the cover for the orientation
locking knob.
12. Tight seal structure provides excellent dustproof
and drip-proof performance. However, it is unable
to provide complete protection from dust and
moisture.
13. Designed for lighter weight with parts made of
magnesium alloy.
* Based on CIPA (Camera & Imaging Products
Association) standards.
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Safety Precautions
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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.
Conventions used in this instruction
Warning to prevent lens or camera malfunction
or damage.
Supplementary notes on using the lens and
taking pictures.
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.
When the lens is mounted on a camera, be sure to also
hold the camera by the lens, including when mounting
on a tripod. Only holding by the camera could result in
scratches on the camera body or the lens itself. The lens
may also detach from its mount and fall, causing injury.
Do not use a strap attached to the camera. The mount
may break, resulting in the lens falling off and causing
injury or in scratches on the camera. Be sure to use the
camera with a dedicated strap attached correctly to the
strap mount on the lens. (Refer to “Attaching the strap”.)
Do not stand on top of the lens case. You may fall and
injure yourself.
Do not pile lens cases on top of one another as they
may fall and cause injury.
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Usage Precautions
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When using this lens, please check the Canon website
for the latest camera firmware. If the camera’s firmware
is not the latest version, be sure to update to the latest
firmware.
For details on updating firmware, please check the
Canon website.
Shooting Precautions
As a characteristic of the diffractive optics with this lens,
colored flare may occasionally appear around the light
source depending on shooting conditions.
For scenes where a light source is inside the screen,
colored flare may occasionally appear as a halo of light
around the light source or appear fanning out from the
light source.
For scenes where a light source is outside the screen,
colored flare may occasionally appear partially inside
the screen. You can reduce or prevent these issues
with the following steps according to the scene you are
shooting.
• Attach a lens hood.
• Use your hand or paneling, an umbrella, etc. to block
the light source and placed so that they do not appear
in the screen.
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Safety Precautions
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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.
• Connect the equipment into an outlet on a circuit different
from that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician
for help.
CAN ICES-3(B)/NMB-3(B)
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Nomenclature
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Hood mount (→ 15)
Orientation locking knob (→ 18)
Security slot (covered) (→ 18)
Playback ring
(→ 10)
AF stop button
(→ 8)
Image stabilizer mode selector switch (→ 12)
Image stabilizer switch (→ 12)
Focus preset button (→ 9)
Focus preset switch (→ 9)
Focus mode switch (→ 7)
For detailed information, reference page numbers are provided in parentheses (→ **).
Focusing distance range
Focusing ring (→ 7)
Distance scale (→ 15)
Strap mount (→ 6)
Drop-in filter (→ 19)
Rubber ring (→ 6)
Contacts (→ 6)
Lens mount index (→ 6)
selector switch (→ 7)
Tripod mount (→ 18)
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1. Mounting and Detaching the Lens
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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
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 index of the dust cap as shown in
the diagram, and turn clockwise. To remove it,
reverse the order.
The lens mount has a rubber ring for enhanced
dust- and water-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.
Attaching the strap
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.
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2.
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Setting the Focus Mode
To shoot in autofocus (AF) mode, set the focus
mode switch to AF.
To shoot in manual focus (MF) mode, set the
focus mode switch to MF, and focus by turning
the focusing ring. The focusing ring always
works, regardless of the focus mode.
To shoot in power focus (PF) mode, set the
focus mode switch to PF when the focus
preset switch (p. 9) is at OFF. For detailed
information, see “6. Power Focus (PF) Mode”
(p. 11).
After autofocusing in ONE SHOT AF mode, focus
manually by pressing the shutter button halfway
and turning the focusing ring. (Full-time manual
focus)
3.
Switching the Focusing
Distance Range
You can set the focusing distance range with a
switch. By setting a suitable focusing distance
range, the actual autofocusing time will be
shorter.
Ranges
FULL
(3.3 m/10.83 ft. - ∞)
3.3 m/10.83 ft. – 8 m/26.25 ft.
8 m/26.25 ft. - ∞
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