Canon EF 16-35mm f/2.8L USM User Manual - Page 2

Thank you for purchasing a Canon product. The Canon EF16-35mm f/2.8L II USM lens is a high-performance, ultra-wide-angle zoom lens for use with Canon EOS cameras. "USM" stands for Ultrasonic Motor. Conventions used in this instruction Warning to prevent lens or camera malfunction or damage. Supplementary notes on using the lens and taking pictures. Features 1. Aspherical and UD lens elements result in outstanding image delineation. 2. Ultrasonic motor (USM) for quick and quiet autofocusing. 3. Manual focusing is available after the subject comes into focus in autofocus mode (ONE SHOT AF). 4. A truly round aperture hole results in a nicer background blur. 5. Tight seal structure ensures excellent dustproof and drip-proof performance. • Since the front element of this lens moves when zooming, you need to attach a Canon PROTECT filter sold separately for adequate dust-and water-resistant performance. Without a filter, the lens is not dust or water resistant. ENG-1