EF17-40mm F4L USM Instruction Manual
Page 2
...Canon EF17-40mm f/4L USM is not dust or water-resistant. Two aspherical elements and a Super UD element result in autofocus mode (ONE SHOT AF). 4. Tight seal structure ensures excellent dustproof and drip-proof performance. • Since the front element of this instruction Warning to attach a Canon...need to prevent lens or camera malfunction or damage. Ultrasonic motor (USM) for adequate dust- Without a filter, the lens is a highperformance wide-angle zoom lens. • "USM" stands for purchasing a Canon product. Manual focusing is available after the subject comes into focus...
...Canon EF17-40mm f/4L USM is not dust or water-resistant. Two aspherical elements and a Super UD element result in autofocus mode (ONE SHOT AF). 4. Tight seal structure ensures excellent dustproof and drip-proof performance. • Since the front element of this instruction Warning to attach a Canon...need to prevent lens or camera malfunction or damage. Ultrasonic motor (USM) for adequate dust- Without a filter, the lens is a highperformance wide-angle zoom lens. • "USM" stands for purchasing a Canon product. Manual focusing is available after the subject comes into focus...