Canon EF 17-40mm f/4L USM Camera Lens

This L-series lens has an entirely new optical design with three Aspherical elements and a Super UD-glass element. The combination provides superb contrast and sharpness, even at the widest settings. It's ideal for both film and digital SLRs, and features the same weather resistant design, rear gel filter holder, and high-speed Ultrasonic Motor as the EF 16-35mm lens

Key Features

- Ultra-wide high performance zoom lens offering excellent image quality.
- Dust-proof and moisture-proof construction 
- Rear focusing and ring USM for silence and high-speed AF 
- 2 UD and 3 types of aspherical elements reducing chromatic aberration and providing superb image quality 
- Non-rotating front element during focus