Canon EF 17-40mm f/4L USM Instruction

Contents

ENG-1Thank you for purchasing a Canon product.The Canon EF17-40mm f/4L USM is a high-performance wide-angle zoom lens.• “USM” stands for Ultrasonic Motor.Features1. Two aspherical elements and a Super UDelement result in outstanding imagedelineation.2. Ultrasonic motor (USM) for quick and quietautofocusing.3. Manual focusing is available after the subjectcomes into focus in autofocus mode (ONESHOT AF).4. A truly round aperture hole results in a nicerbackground blur.5. Tight seal structure ensures excellent dust-proof and drip-proof performance.• Since the front element of this lens moves whenfocusing (zooming), you need to attach a CanonPROTECT filter sold separately for adequatedust- and water-resistant performance. Withouta filter, the lens is not dust or water-resistant.Conventions used in this instructionWarning to prevent lens or cameramalfunction or damage.Supplementary notes on using the lensand taking pictures.COPY