Canon EOS DIGITAL REBEL XTi Instruction Manual page 263

Learn more about macro lenses LJDIIII
Canon Macro Lenses. All the secrets of easy shooting.
Quiet, fast autofocus action. With no expansion
or
contraction of the lens.
Using USM/inl1cr focusing
situations. Convenient for
What's USM?
This stands for Ultrasonic Motor. Conan has pioneered development
of USM for camera lenses. In fact, we've optimized autofocus
action for quick, responsive performance with high torque while
minimizing motor noise.
When you want to photograph a small animal or
an insect, it's important to get close quietly -
without scaring the subject. Canon Macro Lenses
with USM and inner focus let you photograph
subjects with quiet, rapid autofocus. You'll feel
confident to approach many subjects that are
sensitive to sound and motion in the big world
around them. You'll be able to get close and
capture big, bold images of small worlds!
Terms
Benefits of USM
+
inner focus
Canon Macro Lenses are highly regarded by professional photographers for
ease of use and great results.
Our lens technology provides all the features you need for capturing the best shots.
So you can really enjoy macro photography with Canon.
It's easy to learn to control sophisticated functions.
And gradually, you can take one great shot after another!
What's inner focus?
Technology activates focusing by shifting a group
of
lenses inside the unit, rather than moving (expanding or contractingl the
whole lens unit. Since the overall length of the lens doesn't change, you can enjoy shooting ease and compact dimensions.
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