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01 Apr 2011 12:44 PM
Monarch Media Center
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Resource Type: Hardware
Lens 18-55mm : Ultrasonic (EFS 18-55mm)
Concept of development
Canon / EF-S 18-55mm F3.5-5.6 II USM HDW .1901 CAN
The EF-S18-55mm f/3.5-5.6 USM (Photo 1) is a standard zoom lens developed exclusively for the EOS Kiss
Digital with the following objectives:
Compactness, light weight and high image quality by designing an optical system optimized for the Advanced
Photo System C size imaging element dimensions
Wide zoom range (eqv. to 29-88mm in 135-format)
Silent, high-speed AF
Minimizing ghost and flare prevalent in digital photography
New exterior design clearly identifies as the "EF-S" lens
Feature 1: Compact, high performance optical system
The new optical system developed for the EF-S18-55mm f/3.5-5.6 USM is optimized for CMOS sensor of the
Advanced Photo System C size equipped to the EOS Kiss Digital. The EOS Kiss Digital adopts a compact main
reflex mirror that moves back slightly as it swings up (refer to Technical Report September 2003 issue).
Therefore back-focus (distance from the rear of the lens to the focal plane) of the lens can be made shorter than
for the other EF lenses.
In addition, the optical system is more compact because the image circle need only cover the image sensor
diagonal. In the EF-S18-55mm f/3.5-5.6 USM, these factors all contribute to the optimization of the optical design,
resulting in a compact optical system that provides an extended zoom rage as well as improved image quality
(see Fig. 1).
* The "S" in "EF-S" comes from "Small image circle."
Wide zoom range of 29-88mm
A zoom range equivalent to the angle of view of a 29-88mm lens in the 135-format is achieved while minimizing
the total lens length and the number of optical elements used. The lens consist of 4 lens groups, all of which
move (see Fig. 2). By using a molded plastic (PMo) aspherical element, it provides excellent correction for
aberrations that arise during zooming, resulting in superior image quality (see Fig. 3).
Minimum focusing distance of 0.28 meters
The minimum focusing distance of 0.28m through the entire zoom range was achieved by increasing the power of
the focusing lens group. It also gives a maximum magnification of 0.28x at 55mm telephoto (54mm x 81mm field
of view).
Lens coating optimized for use with digital SLR cameras
The EF-S18-55mm f/3.5-5.6 USM features lens shape and coatings optimized for its use with a digital SLR
camera. As a result, the lens successfully realizes both appropriate color balance and minimization of the ghost
and flare attributable to surface reflections from the imaging element.
Circular aperture for attractive out-of-focus effects
The lens uses an EMD (electromagnetic diaphragm) with an aperture that remains virtually circular from wide
open to about two stops down, providing attractive out-of-focus effects (boke).
Feature 2: Mechanical construction exclusively for the EOS Kiss Digital
Rubber ring to prevent scratching
Because of the short back focus, the rear of the lens protrudes further than other EF lenses. Therefore this lens
can only be mounted on the EOS Kiss Digital. (The actual mount interface remains the same as that of other EF
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