Canon lens EF 400mm f4 DO IS USM User Manual

							EF400mm f/4 DO IS USM
Instruction
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The Canon EF400mm f/4 DO IS USM lens is a
high-performance, super telephoto lens
dedicated to Canon EOS cameras. Besides
having an Image Stabilizer, it is the worlds
first camera lens incorporating a multi-layer
diffractive optical element (DO).
The multi-layer diffractive optical element is a
revolutionary element having the
c
haracteristics of both fluorite and aspherical
elements. It greatly contributes to the lens
compactness, light weight, and high image
quality.
• DO stands for Diffractive Optics.
• IS stands for Image Stabilizer.
• USM stands for Ultrasonic Motor.
Features
1.
The multi-layer diffractive optical element effectively
corrects chromatic aberrations prone to occur in super
telephoto lenses. It provides high image quality while
maintaining compactness and light weight.
2.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.
3.Ultrasonic motor (USM) for quick and quiet autofocusing.4.Manual focusing is available after the subject comes into
f ocus in autofocus mode (ONE SHOT AF).
5.The AF Stop button for stopping the AF operation at
anytime.
6.The lens is compatible with Extender EF1.4X ll and
EF2X ll.
7.Tight seal structure ensures excellent dust-proof and
drip-proof performance.
8.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
War ning to prevent lens or camera malfunction
or damage.
Supplementary notes on using the lens and
taking pictures.
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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, 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
f or 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.
a Shooting Precautions
If a very bright spotlight like a mercury lamp is
photographed in a dark place with this lens, a
halo of light may occasionally appear around the
light source because of the DO elements.
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Nomenclature
Distance scale (→ 6)Strap mount (→ 4)
Orientation locking knob (→ 11) Drop-in filter (→ 12)
Lens mount index  (→ 4)
Contacts (→ 4)
Focus mode switch (→ 5)
Focusing distance range selection switch (→ 5)
Image stabilizer mode selector switch (→ 7) Image stabilizer switch (→ 7)
Tripod mount (→ 11)
Tripod collar index (→ 11)
AF stop button 
(→ 6)
Hood mount (→ 10)
  Focusing ring (→ 5)
Rubber ring (→ 4)
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 
Kindex 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
w ater- and dust-resistance. The rubber ring may
cause slight abrasions around the cameras lens
mount, but this will not cause any problems. If the
rub ber 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)
If you autofocus outside the set focusing distance
r ange, the lens may stop focusing at the start of
the focusing range; however, this is not a
malfunction. Press the shutter release button
halfway again.
Y ou can set the focusing distance range to 
3.5 m/11.5 ft. to infinity or 8 m/26.2 ft. to infinity.
By setting the suitable focusing distance range,
the actual autofocusing time can be shorter.
3.Switching the Focusing
Distance Range2. 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
f ocusing ring. The focusing ring always works,
regardless of the focus mode.
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4. AF Stop Button
During autofocus operation, you can press the
AF stop button to temporarily pause autofocus.
If the shutter button is still pressed halfway when
the AF stop button is released, autofocusing will
continue as before.
•With the EOS 630/600, RT, A2/A2E/5, or 10S/10
set to the AI Servo AF mode and continuous
shooting, AF will not resume even after you let
go of the AF stop button. Press the shutter
release button halfway to resume AF.
• With the EOS A2/A2E/5 and 10S/10 set to the
Sports mode, AF will not resume even after you
let go of the AF stop button. Press the shutter
release button halfway to resume AF.
• The AF stop function also works in AI Servo AF
mode.
• By setting the cameras Custom Function, you
can change the AF stop buttons function. For
details, see the cameras instruction manual.
5.Infinity Compensation Mark
Infinity compensation mark
Distance index
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.
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6. Image Stabilizer Settings
You can use the image stabilizer in AF or MF mode.
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 the image in the
viewfinder is stable, then press
the shutter button the rest of
the way down to take the
picture.
Set the STABILIZER switch
to .
•If you are not going to use the
image stabilizer function, set
the switch to         .
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7. Tips on Using the Image Stabilizer
●MODE 1 ●MODE 2
The image stabilizer in this lens is effective for hand-held shots under the following conditions.
• 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.
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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 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 fully effective
in the following cases:
•
Y ou shoot while riding on a bumpy road.•You move the camera dramatically for a panning
shot in Mode 1.
•Y ou shoot using techniques other than following
shots in Mode 2.
• The Image Stabilizer consumes more power
than normal shooting, so fewer shots can be
taken if you use the function.
•
The image stabilizer operates for about two
seconds even when your finger is off the shutter
bu tton. Do not remove the lens while the stabilizer
is in operation. This will cause a malfunction
.
•With Extender EF2X II attached to the lens, the
Image Stabilizer will work with the following cameras:
EOS-1Ds Mark III, EOS-1Ds Mark II, EOS-1Ds, EOS-
1D Mark lll, EOS-1D Mark II N, EOS-1D Mark II, EOS-
1D, EOS 40D, 30D, 20D, 20Da, 10D, 5D, DIGITAL
REBEL XSi/450D, DIGITAL REBEL XTi/400D
DIGITAL, DIGITAL REBEL XT/350D DIGITAL,
DIGITAL REBEL/300D DIGITAL, D60, D30, EOS
DCS1, DCS3, D2000, D6000, EOS-1V/HS, EOS-
1N/DP/HS/RS, 3, ELAN 7E/ELAN 7/30/33, ELAN
7NE/ELAN 7N/30V/33V, ELAN II/ELAN IIE/50/50E,
REBEL X/REBEL XS/500, REBEL G/500N, REBEL
2000/300, REBEL Ti/300V, REBEL T2/300X, REBEL
K2/3000V, IX, IX Lite/IX7, 3000/88, 5000/888
• With the EOS-1V/HS, 3, ELAN 7E/ELAN
7/30/33, ELAN 7NE/ELAN 7N/30V/33V, ELAN
II/ELAN II E/50/50E, REBEL2000/300, IX, and
D30, the Image Stabilizer will not work during
self-timer operation.
•When you use a tripod, the Image Stabilizer
should be turned off to save battery power.
• The stabilizer is equally effective for hand-held
photography and photography with a monopod.
• The Image Stabilizer function also operates
when the lens is used with the EF12 II or EF25
II Extension Tube, and the EF1.4X II Extender.
• Pictures may look distorted after being taken
depending on the camera, but this doesnt affect
shooting.
• If you set the camera’s Custom Function to
change the assigned button to operate the AF,
the Image Stabilizer will operate when you press
the newly assigned AF button.
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