Owner's Manual

• Co"..."o shake _
Image Stabilizer Parallel Movement Principle
Corrected Itghl rays
\. -\
capturing
-
II
I
IS 1ensgrouo
Camera shake
\
\t
•
IS lens group shlfts downward
To subjeCt
1 Lens When sliD
2. Gamera shaken
3. Camera shaklng corrected
How do Canon IS Lenses repress blurring
caused
by camera shake?
Canon IS lenses detect comera 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 secands_
Since the potential optical performance of the lens
is optimized, you can capture beautiful images.
How effective is the shake compensation
capability of Canon IS Lenses?
oL--- --' __ -'- _
EF-Sl5-85mm 113.5-5.615 USM Image Stabilizer
Effect Graph (I = 85mm)
__ D
1 S 1130 1160 t/l25(sec)
. Image Stab/net can be used W1dNn 0 50 sec.
after you press h shunsr bunon halfway
ImageS_ON
118
1/4
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/--
/
/
/
/
/
/
Image Stabilizer ... '
OFF ... "
...
......
...
...
...
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50
''''')
100
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Generally, the shutter speed that allows pho ogrophers to shoot photos without blurring is '1 /focallength'. Of caurse,
the fas er the shutter speed, the greater he benefit in blur reduction. In comparison with lenses hat lack on imoge
stabilizer, Canon IS lenses can achieve the same
blur-free clarity at shutter speeds thai are 2 to 5 steps
(incremen s) slower_ let's to e a look at on EF-S 15-
85mm f/3.5-5.6 IS USM lens, for example. Since
the maximum focal length of this lens is effectively
136mm with cameros' like the EOS REBEL T3i/600D
and others that feature APS-C image sensors, e
slowest shu er speed that could normolly be used
while maintaining a blur-lree image is 1/125 sec.
However, when the IS function is activated. he
shutter speed can be reduced 4 s eps to 1/8 sec.
without blurring. Thus. you can shoot subjects 01
slower shutter speeds without fear of blurred images
- dramaticolly expanding your range of shooting
situations ond photo variations .
18
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