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Canon lens EF 400mm f4 DO IS USM User Manual

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    							EF400mm f/4 DO IS USM
    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
    haracteristics of both fluorite and aspherical
    elements. It greatly contributes to the lens
    compactness, light weight, and high image
    • DO stands for Diffractive Optics.
    • IS stands for Image Stabilizer.
    • USM stands for Ultrasonic Motor.
    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
    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.
    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.
    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 (→ **).
    •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.
    After autofocusing in ONE SHOT AF mode, focus
    manually by pressing the shutter button halfway
    and turning the focusing ring. (Full-time manual
    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.
    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
    • 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.
    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
    • 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
    • Make sure the image in the
    viewfinder is stable, then press
    the shutter button the rest of
    the way down to take the
    Set the STABILIZER switch
    to .
    •If you are not going to use the
    image stabilizer function, set
    the switch to         .
    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
    • In situations where your footing is uncertain.
    •I n situations where fast shutter settings cannot
    be used. •
    When panning subjects in motion.
    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
    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,
    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
    • 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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