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...

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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...

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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...

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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...

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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...

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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...

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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...