Owner's Manual

• Camera shake.
IS benefits
\
\
\
\
Image Stabilizer Parallel Movement Principle
1. Lens When still
, .. ~ .. ~ ~ --H~T"
~ IS lens group
Camera shake
Corrected light rays
Image Stabilizer Unit
How do Canon IS Lenses repress blurring
caused
by camera shake?
Canon IS Lenses detect camera shake with a pair
of built-in gyro sensors, shifting lens components in
the
direction of the vibration to counteract it and
prevent blurring. When the shutter button is pressed
halfway while the IS function is on, compensation
for camera shake is activated in just 0.5 seconds.
Since the potential
optical performance of the lens
is optimized, you can capture beautiful images.
Perhaps
you've encountered blurred images when enlarging pictures: photos that look fine in
smaller postcard sizes appear quite fuzzy at greater size. In fact, camera shake happens more
frequently than
you'd think. There are several reasons for accidental blurring. One cause is the use
of a telephoto lens, which lets you shoot small subjects at higher magnification, and also turns small
vibrations
during shooting into heavy blurring of images. Another cause is shooting in dark places.
When taking pictures at lower shutter speeds, in an unsteady posture, or on an unstable platform
such as a train
or a boat, blurring is quite common.
When does camera shake tend to happen,
and
what causes it to occur?
• To avoid camera shake, the general rule is to use a shutter speed
that is the reciprocal of the focal length (1/focallength x 1.6).
• There
will be a 90% or higher chance of the shot not being blurred by camera shake.
1/125 (sec)
1/60
1/30
-Image Stabilizer can be used within 0.5 sec.
after you press the shutter button halfway.
1/15
1/8
50
EF-S17-85mm 1/4-5.6 IS USM Image Stabilizer
Effect Graph
(f =85mm)
How effective is the shake compensation
capability of Canon IS Lenses?
Generally, the shutter speed that allows photographers to shoot photos without blurring is "1 /focallength". Of course,
the faster the shutter speed, the greater the benefit in blur reduction. In comparison with lenses that lack an image
stabilizer, Canon IS Lenses can achieve the same
blur-free clarity at shutter speeds that are 2 to 4 stops
(increments) slower. Let's take a look at an EF-S 17-
85mm f/4-5.6 IS USM lens, for example. Since the
maximum focal length of this lens is effectively
136mm with cameras * like the EOS DIGITAL REBEL
XTi/400D DIGITAL and others that feature APS-C
image sensors, the slowest shutter speed that could
normally be used while maintaining a blur-free
image is 1/125 sec. However, when the IS function
is activated, the shutter speed can be reduced 3
stops to 1/15 sec. without blurring. Thus, you can
shoot subjects at slower shutter speeds without fear
of blurred images - dramatically expanding your
range of shooting situations and photo variations .
How can you best protect your pictures
from camera shake and blurring?
The most certain way to prevent camera shake is the use of a tripod. Additionally, use of flash can
effectively minimize blurring when shooting in
low lighting conditions. However, it's inconvenient to
carry around a heavy, bulky tripod, and in some places, tripod use isn't even allowed. What's
more, the use of a flash may sometimes spoil the mood of a shooting scene by disrupting the
natural lighting nuances
of the atmosphere. In any of these situations, Canon IS Lenses are the
definitive solution to blurring problems. Just a single
IS Lens can help you capture images in a
natural light,
without other equipment or special set-up, wherever and whenever you want.
I 19 I
• EOS 30D. EOS 20D. EOS 2000. EOS DIGITAL REBEL Xli / 400D DIGITAL. EOS DIGITAL REBEL XI / 350D DIGITAL. EOS DIGITAL REBEL / 300D DIGITAL los 01 Seplembe, 20061 I 20 I