EF17-40mm f/4L USM
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Instruction
a Safety Precautions
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 class B digital device, pursuant to part 15 of the FCC
Rules. hse limits are designed to provide reasonable protection
nst hamful interference in a residential installation. This
ment generates, uses and can radiate radio frequency
ergy and, if not installed and used in accordance with the
instuctions, 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:
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.
• 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.
Handling Cautions
• If the lens is taken from a cold environment in
a warm one, condensation may develop on the
lens surface and internal parts. To preven
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.
• 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
Focus mode switch (→ 5)
Distance scale (→ 6)
Hood mount (→ 7)
Zoom ring (→ 5)
Gelatin filter holder (→ 8)
Filter mounting
thread (→ 7)
Contacts (→ 4)
Focusing ring (→ 5)
Lens mount index (→ 4)
For detailed information, reference page numbers are provided in parentheses (→ **).
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1. Mounting and Detaching the Lens
See your camera’s instructions for details on
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.
• 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 fault
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.
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2. Setting the Focus
Mode
3. Zooming
To shoot in autofocus (AF) mode, set the focus
mode switch to AF.
oomturn the lens’ zoom ring.
Be sure to finish zooming before focusing.
Changing the zoom ring after focusing can affect
the focus.
To use only manual focusing (MF), set the foc
mode switch to MF, and focus by turning the
focusing ring. The focusing ring always works
regardless of the focus mode.
After autofocusing in ONE SHOT AF mode, focus
manually by pressing the shutter button halfway
and turning the focusing ring. (Full-time manual
focus)
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4. Infinity Compensation Mark
5. Infrared Index
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 i
aligned with the distance indicator on the
distance scale.
The infrred index corrects the focus setting when using
nochme infrared film. Focus on the subject
ually, hen adjust the distance setting by moving the
fousing ring to the corresponding infrared index mark.
Some EOS cameras cannot use infrared film. See
the instructions for your EOS camera.
For accurate manual focusing on subjects at
infinity distance, look through the viewfinder while
rotating the focusing ring.
• The infrared index position is based on a
wavelength of 800 nm.
• The compensation amount differs depending on
the focal length. Use the indicated focal length
as a guide when setting the compensation
amount.
• Be sure to observe the manufacturer’s
instructions when using infrared film.
• Use a red filter when you take the picture.
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6. Hood
7. Filters
(Sold separately)
You can attach filters to the filter mounting thread
on the front of the lens.
• To ensure dust- and water-resistant
performance, attach a Canon PROTECT filter
(77mm).
2 4
• Only one filter may be attached.
• If you need a polarizing filter, use the Canon
Circular Polarizing Filter (77mm).
The EW-83E hood can keep unwanted light out
of the lens, and also protects the front of the lens
from rain, snow, and dust.
To attach the hood, align the hood’s attachme
position mark with the red dot on the front of t
lens, then turn the hood as shown by tharrow
until the lens' red dot is aligned with the hoods
stop position mark.
The hood can be reverse-mounted on the lens
for storage.
• Part of the picture may be blocked if the hood is
not attached properly.
• When attaching or detaching the hood, grasp
the base of the hood to turn it. To prevent
deformation, do not grasp the rim of the hood to
turn it.
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8. Filter Holder
9. Extension Tubes
(Sold separately)
You can attach Extension Tube EF12 II or EF25
II for magnified shots. The shooting distance and
magnification are shown below.
Camera-to-Subject
Magnification
Distance (mm)
Near
155
Far
159
271
Near
0.83×
0.59×
Far
17mm
0mm
17mm
40mm
0.70×
0.32×
EF12 II
E25 II
206
There is a gelatin filter holder at the rear of the
lens. Cut the gelatin filter to fit within the white
frames. Then insert the gelatin filter into the fi
holder.
Incompatible
196
218 1.02×
0.70×
Manual focusing is recommended for accurate
focusing.
• Only one filter can be used.
• When you use a gelatin filter, ghosting may
appear in the image.
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10.Close-up Lenses
(Sold separately)
Attaching a 500D (77mm) Close-up Lens
enables close-up photography.
The magnification will be as follows:
• Can be used at the 40mm end (magnification
0.30x - 0.08x)
• Close-up Lens 250D cannot be attached
because there is no size that fits the lens.
• Manual focusing is recommended for accurate
focusing.
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11.Specifications
Focal Length/Aperture
Lens Construction
Minimum Aperture
Angle of View
17 – 40 mm f/4
9 groups, 12 elements
f/22
Diagonal: 104° – 57° 30’
0.28 m/0.92 ft.
Vertical: 70° 30’ – 34°
Horizontal: 93° – 49° 20’
Min. Focusing Distance
Max. Magnification
Field of View
0.24× (at 40 mm)
234 × 365 mm – 100 × 150 mm / 9.2 × 14.4 inch – 3.9 × 5.9 inch (at 0.28 m)
Filter Diameter
77 mm
Max. Diameter and Length 83.5 × 96.8 mm / 3.3 × 3.8
Weight
Hood
475 g / 16.8 oz
EW-83E
Lens Cap
Case
E-77U/E-77 II
LP1319
• The lens length is measured from the mount surface to the front end of the lens. Add 21.5 mm to include the
E-77U lens cap and dust cap, and 24.2 mm for the E-77 II.
• The size and weight listed are for the lens only, except as indicated.
• The EF1.4X II/EF2X II extenders cannot be used with this lens.
• Aperture settings are specified on the camera.
• All data listed is measured according to Canon standards.
• Product specifications and appearance are subject to change without notice.
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0812Ni © CANON INC. 2003
CT1-8513-004
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