Canon EOS REBEL T3 Basic Instruction Manual page 469

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Image Stabilizer Parallel Movement Principle
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IS lens group stults downward
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1 Lens 'Nhen stili
2 Camera shaken
3. Camera shaklng corrected
How do Canon IS Lenses repress blurring
caused by camera shake?
Conan IS lenses detect camero shake with a poir
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 camero shake is activated in just 0.5 seconds.
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?
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EF·Sl5-8Smm tI3.SOS.6 IS USM Image Stabltlzer
EHect Graph (f ;:: 85mm)
Im.age SlabIIizer ON
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Generally, the shutter speed thai allows photographers to shool photos without blurring is 11 /focallength ' Of course,
Ihe faster the shutter speed, the greater the benefil 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 5 steps
(increments) slower. letts toke a look at an EF-S15·
B5mm 1/3.5·5.6 IS USM lens, fo' exomple Since
the maximum focal length of this lens is eHectively
136mm wiih comeros' like ihe EOS REBEL 13i/600D
and others thol leature 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 4 steps to 1/8 sec.
without blurring_ Thus, you con shoot subiecls
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slower shutter speeds without fear of blurred images
- dramatically expanding your range of shooting
situations and photo variations.
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