• Compensation optics lens barrel suspended by 3 springs that hold it in place in the
center, making it possible to eliminate the compensation optics retaining mechanism
in this IS unit
• Orientation of the compensation optics lens barrel along
the optical axis maintained using the force exerted by
angle-mounted springs and ceramic ball bearings (The
rotation of these ceramic ball bearings ensures that the
corrective optics are driven smoothly)
• Silicone resin damper fitted between the compensation
optics lens barrel and the supporting component (lens
group 2 lens barrel) damps harmful vibrations caused by
the extension and contraction of the springs and
improves IS performance
• Drive actuator for the compensation optics lens barrel constructed using the same
permanent magnets and coils used in existing IS units
• Construction of the new unit is based on the IS mechanism used in the PowerShot
SD700 IS Digital ELPH with design optimized for the characteristics of this lens
• Incorporating part of the lens group 2 lens barrel as a component of the IS unit makes
it possible to install the IS mechanism in a very limited space
• Automatically distinguishes between normal shooting and panning shots and selects
the optimum Image Stabilizer mode, a first for Canon IS lenses—vibration gyro used to
detect the difference between normal camera shake and panning movement—MODE
1/Normal and MODE 2/panning eliminated
• A tripod can be used with IS left ON (but switching OFF will still reduce power con-
sumption)
• Minimum focusing distance of 0.25m at all zoom settings
• Maximum magnification is 0.34x (at 55mm)
• Uses round EMD diaphragm for very good background blur quality (bokeh) and round
points of light
VI. ACCESSORIES AND LENS
Structural Diagram of the IS
Unit Used in the
EF-S 18-55mm f/3.5-5.6 IS
(schematic)
Spring
Ceramic ball
Compensation optics
lens barrel
Compensation optics
Compensation optics
movement
Damper
35
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