Canon EF 11-24mm f/4L USM User Manual - Page 2
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Thank you for purchasing a Canon product. Canon's EF11-24mm f/4L USM is a highperformance ultra-wide angle zoom lens, for use with EOS cameras. ●● "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. ENG-1
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