Canon EF11-24mm f/4L USM User Manual page 2

Thank you for purchasing a Canon product.
Canon's EF11-24mm f/4L USM is a high-
performance ultra-wide angle zoom lens, for use
with EOS cameras.
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"USM" stands for Ultrasonic Motor.
Features
1. Use of super UD lens elements, UD lens
elements, and two types of aspherical lens
elements giving superior definition.
2. SWC (Subwavelength Structure Coating)
and ASC (Air Sphere Coating) are utilized to
significantly reduce occurrences of flare and
ghost created by quite large incident angles of
light.
3. Using a fluorine coating on the foremost and
rearmost lens surfaces allows adhered dirt to be
removed more easily than before.
4. Ultrasonic motor (USM) for fast, quiet autofocus.
5. Manual focusing is available after the subject
comes into focus in autofocus mode (ONE
SHOT AF).
6. Circular aperture for producing beautiful
softfocus images.
7. Tight seal structure provides excellent dustproof
and drip-proof performance. However, it is
unable to provide complete protection from dust
and moisture.
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