VI. ACCESSORIES AND LENS
34
New IS Lens
The Canon EF-S 18-55mm f/3.5-5.6 IS is a standard zoom
lens specifically for cameras that take EF-S lenses. It was
developed in response to market demand for a zoom
lens equipped with Image Stabilizer technology at a
reasonable price.
The advantages of IS in the lens are, first, that each IS
system can be designed and optimized for its specific
application, yielding a level of performance unattainable
by the in-body, shifting sensor technique. Second, one
can see the image stabilization effect in the finder. The
image is steady; accurate framing is possible; the AF
point can be placed precisely, and the photographer can
concentrate on the shot and capture the best moment.
Panning is also easier and more effective than with the
in-body approach.
While it is roughly equivalent in weight and size to the
EF-S 18-55mm f/3.5-5.6 II/ f/3.5-5.6 II USM, it offers
an image stabilization effect equivalent to a shutter
speed of 4 stops faster, giving it superb specifications as
well as a modest and attractive price.
The EF-S 18-55mm f/3.5-5.6 IS lens features:
• Light and compact IS-equipped standard zoom lens specifically for cameras that take
EF-S lenses (For EOS 40D, EOS 30D, EOS 20D, EOS 20Da, EOS Digital Rebel XTi, EOS
Digital Rebel XT and EOS Digital Rebel only, as of August 2007)
• Uses smaller circuit boards and a downsized IS unit to make a Canon Image Stabilizer
lens that is roughly the same size and weight as the EF-S 18-55mm f/3.5-5.6 II/ f/3.5-
5.6 II USM
• High-speed autofocus features high-speed
CPU and optimized AF algorithm
• Image Stabilizer effect equivalent to a
shutter speed about 4 stops faster
• Uses a high-precision PMo aspherical
element to correct aberration for excellent
image quality throughout the zoom range
Image Stabilization with Shifting Elements
External view and cross section of EF-S18-55mm f/3.5-5.6 IS
EMD
Lens mount index
Image stabilizer switch
IS unit
Focusing Ring
Focus mode switch
Hood Mount (Bayonet)
Zoom Index
Zoom Ring
Rubber ring
Silver ring
Minimum focusing distance mark
External View and Cross Section of
EF-S 18-55mm f/3.5-5.6 IS
Revisions:
R2:CONFIDENTIAL
EF-S18-55mm
f/3.5-5.6 IS lens movement during zooming.
TI-07201-6-00
18mm
30mm
55mm
at 18mm :84.5mm/at 55mm:55.4mm
at 18mm:35.3mm
/at 55 mm:65.8mm
Compensation optics
PMo aspherical lens
Diaphragm
Lens group 2
Lens group 1
(Focusing lens group)
Image plane
Lens
group 3
Lens group 4
EF-S 18-55mm f/3.5-5.6 IS Lens
Movement During Zooming
Optical Construction
EF-S 18-55mm f/3.5-5.6 IS
