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Aspherical Elements

Wide-angle lenses and fast normal
focal-length lenses often suffer from
another optical problem; spherical
aberration. Spherical aberration
occurs when the point of focus of the 

light ray coming through the centre of
the lens does not align with the point
of focus of the light ray coming
through the lens edge. Since there 
is no sharp point of focus, the image
looks blurred. Canon’s Aspherical
elements change the curvature from
centre to edge, to align the points 
of focus of the incoming light rays so
that the entire image plane appears
focused. Aspherical optics also help
to correct curvilinear distortion as one
would find in ultra-wide-angle 
lenses. Finally, Aspherical elements
have an extremely precise variable
curvature of one or both sides,
allowing for more compact and lighter
lens designs. 

Canon’s exclusive Super Spectra
Coating and anti-reflective material
inside of lens barrels virtually
eliminate internal ghosting and flare
in all L-series lenses. Weather sealing

keeps dust out, 
and allows for 
photography in
less-than-perfect
weather conditions.

EF Mount

In designing the EF lens mount,
Canon engineers gave photographers
a lot more than simply a way to
quickly attach an interchangeable
lens to a camera body. As the
communication conduit between
camera and lens, the fully electronic
mount system has none of the shock,
operational noise, abrasion, play,
lubrication requirements, slow
response, or diminished precision
caused by lever operation, or design
restrictions related to linkage
mechanisms used to transfer data. A
lens operation self-test system, using
the lens’s built-in microcomputer, can
even warn of malfunctions through
the camera’s LCD readout to help
ensure high reliability. 

The EF mount allows for high-speed
focus, precise aperture control and 
preview, automatic compensation 
with lens extenders, and forward 
compatibility with new lens
technologies like USM, IS and more,
as they are developed by Canon.

Specialty Lenses

Canon’s EF Lens system includes
many special purpose lenses, ranging
from full-frame fisheye, Tilt Shift,
macro, and everything in between.

FISHEYE

Perfect for super wide-angle and 
special effect photography, Canon’s
full-frame fisheye can focus as 
close as eight inches (0.2m), 
and is tack-sharp throughout its
focus range. Up to three gel filters
can be inserted into its built-in rear
filter holder.

MACRO

To bring small things into full-sized
view, Canon’s EF lens lineup has a
number of options for true close-up
and macro photography. With four
macro lenses for precision, and three
screw-on Close-up Lenses for
convenience, in addition to Life-Size
Converter EF and two Extension
Tubes, Canon’s macro lenses and
close-up accessories can uncover 

detail that would be impossible to
detect by the eye and give new
perspective to extremely minute
subjects such as insects or the petals
of a small flower.

TS-E LENS MOVEMENTS

TS-E lenses are capable of tilt and
shift movements, which greatly
expand picture-taking possibilities,
bringing many of the advantages 
of technical view cameras to the 
EOS system. Tilt movements alter 
the angle of the plane of focus
between the lens and film plane,
making broad depth-of-field possible
even at large apertures or vice versa;
shift movements move the lens’s
optical axis in parallel, allowing the
photographer to change or correct
the perspective of their photograph 
at almost any angle.

Image Stabilizer

Canon’s Image Stabilizer (IS)
technology makes hand-held
photography possible in more 
low-light situations than ever before.
When camera shake occurs using
normal lenses without Image 
Stabilizer technology, the image 

projected to the focal plane also
shakes, often resulting in blurred
images at shutter speeds less than
1/focal length. When this same
movement occurs with an IS lens
attached, a special group of lens
elements automatically shifts its
position, thereby compensating for 
the shake and stabilising the image. 
Here’s how Canon’s original Image 
Stabilizer technology works: 

A high-speed
microcomputer
built into the lens
analyses electronic
signals emitted by
vibration-detecting
gyro sensors 
and controls a
mechanism that
moves the image
stabilising lens
group parallel to
the focal plane,
resulting in a
sharper image.
This compensation
effectively adds up

to three shutter speed steps to your
hand-held shooting capability,
depending on the IS lens you choose.
Canon’s IS lenses are perfect for low
light, or situations where a tripod is
not convenient. 

Diffractive Optics

Canon’s use of diffractive optics 
result in lenses that are both 
high performance and more compact
than those with traditional refractive
designs. While conventional glass lens
elements disperse incoming light,
thereby causing chromatic aberration,
Canon’s unique multi-layer diffractive
elements work together with
conventional glass optics to cancel
the effects of dispersion and minimise
or eliminate chromatic aberration.
Here’s how it works: Diffractive
coatings are bonded to the rear
surface of one lens element and the
front surface of another. These
elements are attached to each other
to form a single multi-layer diffractive
optics (DO). 

The DO element’s dispersion
characteristics are reversed when
compared with conventional optics,
making it possible to cancel chromatic
aberrations at each wavelength when
conventional and DO elements are
combined. In addition to chromatic
aberration correction, this technology
also results in smaller lenses, with no
compromise in quality. For example, 
the EF 400mm f/4 DO IS USM lens is
approximately 27% shorter and 36%
lighter in weight than a conventional
400mm f/4 telephoto lens would be, 
yet the quality of the resulting image 
is comparable with one that an 
L-series lens would produce.

Ultrasonic Motor

In order to achieve critical autofocus,
the elements within a camera lens
have to move quickly, quietly and
precisely. With this in mind, Canon
developed the world’s first lens-based
Ultrasonic Motor (USM), which spins
the lens motor with ultrasonic
oscillation energy. Instead of a large,
noisy drive-train system, electronic
vibrations created by piezoelectric
ceramic elements power the
mechanical action of the lens, 

providing constant torque, with
virtually instantaneous stops and
starts. USM lenses are both faster
and quieter than conventional 
motor-driven autofocus systems, and
draw minimal power from the camera,
draining far less critical battery power.

Canon makes two
types of Ultrasonic 
lenses. Ring-type
USM-equipped
lenses, found in
large aperture and
super telephoto
designs, allow 
manual focusing
without switching
out of the auto

mode. Micro USM designs bring 
the performance benefits of Canon’s
USM technology to a wide assortment
of affordable EF lenses. 

L-Series Lenses

No lenses have a better reputation
among professional photographers
than those in Canon’s L-series.
Identifiable by a bold red ring around
the outer barrel, these lenses are 
distinctive in their performance
through use of optical
technologies like 
Ultra-low Dispersion
UD glass, Fluorite 
and Aspherical 
elements and Super
Spectra Coating.

FLUORITE/UD ELEMENTS

Avoiding colour fringing, or chromatic
aberration, has been one of the great
challenges in the design of telephoto
lenses. L-series telephoto lenses like
the EF 70-200mm f/2.8L IS USM and
EF 300mm f/4.0L IS USM utilise
Canon’s Ultra-low Dispersion glass to
minimise this effect. The design of
UD glass provides outstanding

contrast and
sharpness and
minimises the
splitting of colours
as they pass
through the

elements, resulting in cleaner colour
throughout the image. 

Even more effective at suppressing
chromatic aberration are Fluorite 
elements, used in high-end super-
telephoto lenses like the EF 300mm
f/2.8L IS USM and EF 400mm f/2.8L 
IS USM. A single Fluorite element
has the corrective power of two UD
glass elements, giving these L-series
lenses their spectacular performance
and relatively compact design.

CANON LENS TECHNOLOGY

1: No camera shake

2: Lens front shakes 
    downward

3: Image stabilising 
    group counteracting 
    downward camera 
    shake

Group 1
(focusing
group)

Group 2
(Image
stabilising
group)

To
Object

Film
Plane

Direction of
Group 2 
Movement

Group 3 to 6

ring-type USM

micro USM

fluorite and UD glass

Glass

Fluorite

Anomalous 
dispersion

Red

Blue

Comparison of optical characteristics 

between optical glass and Fluorite

EF 15mm f/2.8 Fisheye •f/16 •1/640 sec.

without Tilt
Shift Lens

with Tilt Shift Lens

With a normal lens

With a TS-E lens

Red

Blue

EF 100mm f/2.8 Macro USM •f/5.6 •1/6 sec.

Ring-type USM

Micro USM

Gear unit

Micro
USM II

EMD

electronic mount - 
camera side

electronic mount - 
lens side

spherical aberration of
spherical lens

convergence of parallel 
light rays by an 
Aspherical lens

various lens actuators

using shift movements to focus tall building

aspherical lens example

spherical 
lens 
example

Canon EF Lens: The Heart of the EOS System

At the core of the EOS system, Canon’s renowned EF lens series offers infinite
choices and features for any project, and any budget. With over 50 lenses
ranging from fisheye to super-telephoto, with both fixed-length and zoom 
lenses to fit any photographer’s needs, EF lenses have proven their worth in
every photographic context. 

Canon designs and manufactures each of their lenses to provide high image
quality throughout the entire image area, with natural background blur, and
consistent colour regardless of the lens chosen. All Canon EF lenses are
designed to be quick, quiet, and highly reliable. With these priorities in mind,
Canon’s designs have remained on the cutting edge of technological 
innovation – if a technology does not exist, Canon invents it. Here’s a closer look
at some of the technologies that Canon has incorporated into their EF lenses.

multi-layer DO element construction

How the Image 
Stabilizer Works

EF 400mm f/4 IS DO USM •f/4 •1/1250 sec.

Image Stabilizer ON

with Image 
Stabilizer OFF

15

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iCAN0238_EOS_System_A  2/7/04  5:19 PM  Page 11

Содержание Digital Camera Lens

Страница 1: ...EOS System iCAN0238_EOS_System_A 5 7 04 11 03 AM Page 2 ...

Страница 2: ...bilizer as well as numerous other accessories including Speedlite flash units with Canon s E TTL flash exposure system Power Drive Boosters dedicated photo printers remote controllers and much much more If you already own an EOS camera you can stimulate and broaden your creativity by taking advantage of the many system accessories available for your camera If you haven t tried EOS yet come and see...

Страница 3: ...e camera that s comfortable to hold and easy to use EOS 300D is the new standard in premium quality digital SLRs Photography Without Limits Magnesium alloy body Perfect for journalists studio and wedding photographers or anyone who wants the highest possible resolution from their digital SLR the EOS 1Ds sets a new standard raising the bar on image quality while retaining proven EOS performance Wit...

Страница 4: ...n eye to the future of digital photography Canon is convinced that the further development of RAW and JPEG technologies will enable digital photographers of the future to have the highest quality images possible Bearing that in mind all of Canon s digital EOS SLRs can record JPEG and RAW files simultaneously Often referred to as digital negatives RAW files are no compromise reversible compression ...

Страница 5: ...raise the bar for performance in a high quality 35mm SLR These features include a 45 point autofocus system Canon s amazing Eye Controlled AF predictive AF up to 7 frames per second with optional Power Drive Booster PB E2 and NP E2 battery pack E TTL auto flash 18 custom functions compatibility with Canon s full range of autofocus lenses and Speedlites and much much more These capabilities are inc...

Страница 6: ...ilm automatically prewound to the end of the roll when loaded rewinds one frame at a time during shooting Film automatically prewound to the end of the roll when loaded rewinds one frame at a time during shooting Single and 1 0 frames sec EV 1 20 for all patterns at ISO 100 with f 1 4 TTL full aperture metering 35 zone evaluative metering Pre flash metering 9 5 partial area metering set automatica...

Страница 7: ...Eyepiece Ed Dioptric Adjustment Lens Ed Angle Finder C Remote Switch RS 60E3 Eyecup Ef Wireless Remote Controller RC 1 Battery Pack BP 220 Rubber Frame Ef Dioptric Adjustment Lens E Date Back DB E2 Battery Pack BP E1 Anti Fog Eyepiece Ed Wireless Controller LC 4 Remote Switch Adapter RA N3 Remote Switch RS 80N3 Timer RemoteController TC 80N3 Angle Finder C Extension Cord ET 1000N3 Eyecup Ed Eyecup...

Страница 8: ...tion Here s how it works Diffractive coatings are bonded to the rear surface of one lens element and the front surface of another These elements are attached to each other to form a single multi layer diffractive optics DO The DO element s dispersion characteristics are reversed when compared with conventional optics making it possible to cancel chromatic aberrations at each wavelength when conven...

Страница 9: ... 38 1 25 USM 1 77 83 2 3 3 x 123 5 4 9 950 2 1 0 5 1 6 USM 1 67 73 0 2 9 x 69 5 2 7 380 13 4 0 38 1 25 MM 2 58 67 2 6 x 71 2 8 200 7 8 0 38 1 3 Micro USM 58 67 2 6 x 71 2 8 190 6 7 0 38 1 3 MM 58 67 2 6 x 71 2 8 190 6 7 0 48 1 57 Micro USM 58 67 2 6 x 68 2 7 180 6 3 0 38 1 3 MM 58 67 2 6 x 71 2 8 180 6 3 0 5 1 64 USM 1 72 78 4 3 1 x 96 8 3 8 540 18 9 0 4 1 3 MM 2 52 65 0 2 6 x 63 5 2 5 175 6 2 0 7...

Страница 10: ...s a priority Speedlite 550EX Dimensions W x H x D 80 x 138 6 x 111 9mm Weight 405g without batteries Canon s flagship Speedlite the 550EX meets strict specifications for both professional and advanced amateur users of EOS series cameras The 550EX is fully E TTL compatible with all current EOS SLRs and most of its features are backward compatible with any EOS SLR ever made All this with a maximum G...

Страница 11: ...tibility Chart on page 21 TTL is identical to A TTL in almost every way except there is no pre flash When the camera is set to Program mode TTL flash sets an aperture based on the ambient light level Note A TTL and TTL are not compatible with digital SLRs Optional Settings for Enhanced Creativity FE LOCK Flash Exposure Lock FE Lock adds Auto Exposure Lock and spot metering functions to flash photo...

Страница 12: ...1 to 1 8 The flash output of the C Speedlite group can be adjusted through flash exposure compensation The E TTL autoflash system controls the total flash output to obtain a correct exposure Also when Speedlite 550EX is used with the EOS 1Ds EOS 1D EOS 10D EOS 300D EOS D60 EOS D30 EOS 1v EOS 3 EOS 30 33 or EOS 300V you can fire a modelling flash for 1 sec at 70Hz by pressing the depth of field pre...

Страница 13: ...s Ni MH Charger NC E2 Weight 354g This charger is dedicated to both the NP E3 Battery Pack for the EOS 1Ds 1D and the rechargeable NP E2 Pack for the Power Drive Booster E2 Two packs can be attached at once The discharge feature taking up to 8 5 hours cancels the pack s memory effect It runs on 100 240v AC so it s ideal for international travel Power Drive Booster E2 Ni MH Pack NP E2 Ni MH Pack NP...

Страница 14: ...ies to work as an additional power source for the camera The BP 220 also functions as a vertical grip for the camera with a shutter release button and on off switch Battery Pack BP 8 Weight 95g without batteries This lightweight compact battery pack is designed for use with the Canon EOS 500N EOS 500 and EOS 3000N cameras It is a cost efficient power supply requiring only four AA alkaline or Ni Cd...

Страница 15: ... D30 10D 300D D60 Video Cable VC 100 This cable enables direct image display from the camera to a television or a similar display device Interface Cable IFC 400PCU IFC 300PCU IFC 200PCU These USB interface cables are used to connect the EOS to a Mac or PC via a USB terminal 10D 300D D60 Battery Grip BG E1 Weight 320g without batteries The BG E1 is a large capacity battery pack and vertical grip de...

Страница 16: ... 1N 1 5 RT 600 620 650 1N RS 1N 1 5 RT 600 620 650 300D 30V 33V 30 33 50 50E 100 300V 10 100 700 750 850 10D D60 D30 1Ds 1D Mark II 1D D2000 1V 1V HS 1N RS 1N 1 3 5 30V 33V 30 33 50 50E 300D 1Ds 1D Mark II 1D 1 1v 1v HS 1N RS 1N 3 5 30 33 30V 33V 50 50E 1Ds 1D D2000 1V 1V HS 1N RS 1N 1 300D 3 5 30V 33V 30 33 or 50 50E IX IX 7 ALL except 30 33 30V 33V 50 50E IX IX 7 ALL 3 5 30V 33V 30 33 50 50E ALL...

Страница 17: ...s matte field screen with vertical and horizontal scales marked in millimeters is compatible with all lenses It is effective for close up photography and photomicrography and useful in determining magnification ratios and composition Ed N New Laser Matte with AF Frames Standard with the EOS A2 this screen has five AF frames and is excellent for general photography with all lenses Ed Ne New Laser M...

Страница 18: ... EF 100mm f 2 USM EF 100mm f 2 8 Macro EF 135mm f 2 8 w Soft Focus EF 16 35mm f 2 8L USM EF 17 35mm f 2 8L USM EF S 18 55mm f 3 5 5 6 EF 20 35mm f 2 8L EF 20 35mm f 3 5 4 5 USM EF 22 55mm f 4 5 6 USM EF 24 70mm f 2 8L USM EF 24 85mm f 3 5 4 5 USM EF 28 70mm f 2 8L USM EF 28 70mm f 3 5 4 5 II EF 28 80mm f 3 5 5 6 II USM EF 28 80mm f 3 5 5 6 III USM EF 28 80mm f 3 5 5 6 IV USM EF 28 80mm f 3 5 5 6 V...

Страница 19: ...ew Zealand Freecall 0800 222 666 Facsimile No 64 9 489 0380 canon com au canon co nz canon com au digitalimage Canon is a registered trademark of Canon Inc and advanced simplicity is a trademark of Canon Australia Pty Limited Microsoft Windows and the Windows Logo are registered trademarks of Microsoft Corporation in the United States and in other countries All other trademarks are iCAN0238_EOS_Sy...

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