Ultrasonic Motor
The Ultrasonic Motor (USM) was
introduced with the Canon EF 300mm f/2.8L
USM lens in 1987. Silent and accurate, USM
technology powers the rapid auto focusing
performance of almost every current EF lens.
Image Stabilizer
Pioneered by Canon in 1995, Image
Stabilizer technology uses gyro sensors
to detect and compensate for unwanted
camera shake. Today’s IS systems allow
photographers to shoot up to 5 stops slower
with no increase in blur. Since the image
is stabilised within the lens instead of the
camera, the IS system can be optimised for
each model. What’s more, the auto focus
system has a steady image to work with
and the photographer gets a steady image
through the viewfinder.
Canon’s Subwavelength Structure (SWC)
Canon’s Subwavelength Structure (SWC)
anti-reflective coating is what is known as
a biomimetic technology – mimicking a
phenomenon found in nature. Working at
the nanoscale, the SWC coating is inspired
by features found within the eyes of moths.
Fluorine coating
In 2010 Canon introduced a new coating for
lenses elements. Using Fluorine with its tight
molecule bond, this new coating provides a
tough anti static surface that prevents dust
and water from clinging to any exposed lens
elements ensuring easier cleaning.
Aspherical lenses
Canon was the first company to introduce
aspherical elements for SLR lenses
to counteract the problem of spherical
aberration . These special elements
play an integral part in delivering the
corner-to-corner sharpness and clarity
of top performers in the EF range.
Diffractive optics
Canon is the first and only company in the
world to incorporate a Diffractive Optical (DO)
element into an interchangeable SLR lens.
This approach produces outstanding image
quality, but these lenses are significantly
lighter and smaller than similar
conventional lenses.
The EF advantage
What sets the EF lens range apart? Innovation. Canon has been pursuing the
perfect lens for more than six decades. This pursuit has generated a raft of
pioneering technologies, the very best of which are found in today’s line-up.
Fluorite and UD lens elements
Fluorite crystal and Ultra-low Dispersion
(UD) glass elements combat chromatic
aberration or ‘fringing’. By virtue of their
special diffraction properties, these materials
keep colours accurate and contrast high.
Lens coatings
Light reflected off lens elements and the
image sensor can cause ghosting (secondary
images) and flare to appear in images.
Canon’s Super Spectra coating absorbs
light rather than reflecting it. The new
Subwavelength structure coating (SWC)
goes one step further, effectively eliminating
the cause of problematic reflections to ensure
crisp, undistorted images.
Fluorite and UD lens elements keep colours accurate Inside an ultrasonic motor
10/11
Spherical aberration of spherical lens
Convergence of parallel light rays by an
Aspherical lens
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