Camera Shake - Canon EOS 30D Instruction Manual

• Camera shake _
To subject
1. Lens When still
2.
cam:~~~=~~t~~a:~rake
Corrected light rays
3. Camera shaking corrected . . . \
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.
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IS lens group shifts downward
Image Stabilizer Parallel Movement Principle
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.
Image Stabilizer Unit
How effective is the shake compensation
capability of Canon
IS
Lenses?
• 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)
1/30
• Image Stabilizer can be used within 0.5 sec.
after you press the shutter button halfway.
Image Stabilizer ON
1/15 1/8
50
EF-S17-85mm f/4-5.6 IS USM Image Stabilizer
Effect Graph (f
=
85mm)
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.
* EOS 30D, EOS 20D, EOS 20Da, EOS DIGITAL REBEL XTi / 400D DIGITAL, EOS DIGITAL REBEL XT / 350D DIGITAL, EOS DIGITAL REBEL / 300D DIGITAL. (as of September 2006)
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