Canon EF17-40LU User manual

Thank you for purchasing aCanon USM'lens.
The Canon EF17 ~40mm f/4L USM is ahigh-
performance wide-angle zoom lens.
"USM" stands for Ultrasonic Motor.
Features
1. Two aspherical elements and aSuper UD
element result in sharp pictures and
outstanding image delineation.
2. Ultrasonic Motor (USM) for silent and high-
speed
AF operation.
3. Manual focusing enabled even in the
AF mode.
4. Circular diaphragm for better background blur.
5. Sealed construction for higher dust- and water-
resistance compared to previous lenses. (For
maximum protection, afilter must also be
attached to the front
of the lens.)
~ Handling Cautions
If the lens is taken from acold environment into a
warm
one, condensation may develop on the lens
surface
and internal parts. To prevent condensation in
this case, lirst put the lens into an airtight plastic bag
before taking it from acold to warm environment.
Then take out the lens after it has warmed gradually.
Do the same when taking the.Iens from awarm
environment into acold one.
Although the lens
is dust- and water-resistant, afilter
must also
be attached to the front of the lens for
complete protection. (The front of the lens moves
during zooming.)
Conventions used in this instruction
.-. Warning to prevent lens or camera malfunction
~ or damage.
~ Supplementary notes on using the lens and
LjJ taking pictures.
1i1-1

•Reorient or relocate the receiving antenna.
•Increase the separation between the equipment and
receiver.
•Consult the dealer or an experienced radiofTV
technician for help.
This digital apparatus does not exceed the Class B
limits for radio noise emissions from digital apparatus as
set out
in the interference-causing equipment standard
entitled "Digital Apparatus", ICES-003 of the Industry
Canada.
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 aclass Bdigital device, pursuant to
part 15 of the FCC Rules. These limits are designed to
provide reasonable protection against harmful
interference
in aresidential 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 aparticular 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:
m-2
(E:
The (E: Mark is aDirective conformity mark
of the European Community (EC)

Focus mode switch (---7 5)
Hood
mount (---7 7)
1---------
Filter mounting
thread (---78)
Focusing ring
(---7 5)
Distance scale
(---7 6,7)
Zoom ring (---7 6)
Gelatin filter holder
(---7 8)
Contacts
(---7 4)
Lens mounting index (---74)
C') Numbers in parentheses indicate reference page numbers.
1E1-3

See your camera's instructions for instructions on
mounting and detaching the lens.
•After detaching the lens, attach the dust cap to
the rear of the lens to prevent the contacts and
lens from getting scratched.
•If the contacts are dirty, scratched, or soiled with
fingerprints, etc., corrosion
ora faulty
connection or operation may result.
•Always attach the
dust cap to the lens when the
lens is not mounted on the camera.
To attach
the dust cap, align the mark on the dust cap
with the mark on the lens and turn the dust cap
clockwise.
To remove the dust cap, turn it
counter-clockwise.
11-4
oThe lens mount has arubber 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.

~
~~
To shoot in autofocus mode, set the focus mode
switch to AF.
To use only manual focusing, set the focus mode
switch to MF , and focus by turning the focusing
ring.
The manual focus 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.
61-5

To zoom, turn the zoom ring.
ft
m
4) •Be sure to finish zooming before focusing.
Changing the zoom ring after focusing can affect
the focus.
•This lens can partially obstruct the light from the
built-in flash units.
To avoid this, use an external
flash.
11-6
To compensate for shifting of the infinity focus
point that results from changes
in temperature,
you can rotate the distance scale slightly past
the normal infinity focus mark.
•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.
•For accurate manual focusing
on subjects at infinity
distance, look through the viewfinder while rotating the
focusing ring.

ft
m
The infrared index corrects the focus setting when using
monochrome infrared film. Focus on the subject
manually, then adjust the distance setting by moving the
focusing ring to the corresponding infrared index mark.
• The compensation amount differs depending on the
focal length. Use the indicated focal length as a
guide when setting the compensation amount.
oSome EOS cameras cannot use infrared film. See
the instructions for your EOS camera.
[l] •The infrared index position is based on a
wavelength of 800 nm.
•Be sure to observe the manufacturer's
instructions when using infrared film.
•Use ared filter also when you take the picture.
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 attachment
position mark with the red dot on the front of the lens,
then turn the hood clockwise until the lens's red dot is
aligned with the hood's stop position mark.
The hood can be reverse-mounted on the lens for storage.
o ·Part of the picture may be blocked if the hood is
not attached properly.
•
To attach (remove) the hood, grasp the base of
the hood and turn it clockwise
(counterclockwise). Do not hold the hood by the
outer rim as this could result
in the hood being
distorted if too much pressure is applied.
[51-7

You can attach filters to the filter mounting thread
on the front of the lens.
•If you need apolarizing filter, use Canon's 77 mm
PL-CII polarizing filter.
[ll Only one filter may be attached.
11-8
There is agelatin 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 filter
holder.
oWhen you use agelatin filter, ghosting or flare
spots may appear
in the image.

With Extension Tube EF 12 or EF 25, the
camera-to-subject distance and image
magnification will be as follows:
Camera-to-Subject Magnification
Distance (mm)
Near Far Near IFar
EF12 17mm 155 159 0.83x I0.70x
40mm 206
271 0.59x I0.32x
EF25 17mm Incompatible Incompatible
40mm 196 218 1.02x I0.70x
GI-9