Canon EF 17-40mm f/4L USM Ultra Wide Angle Zoom Lens for Canon SLR Cameras

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Broaden your perspective with the Canon EF 17-40mm ultra-wide-angle zoom lens. Ideal for both film and digital SLR cameras, the lens offers three aspherical lens elements in addition to a Super UD (ultra-low dispersion) glass element, creating superior optics in all conditions. In addition, the lens focuses as close as 11 inches (0.28mm), and offers both Canon's full-time manual focus and a powerful ring-type ultra-sonic monitor (USM) that produces fast and silent autofocus. Other features include a constant f/4 maximum aperture, the choice of screw-in 77mm filters or a holder in the rear of the lens for up to three gel filters, and optical coatings optimized for use with digital cameras. Boasting weather-resistant construction similar to other high-end L-series cameras, the lens carries a one-year warranty.

Focal length: 17-40mm
Maximum aperture: 1:4
Lens construction: 12 elements in 9 groups
Diagonal angle of view: 104 to 57 degrees (at 30 feet)
Focus adjustment: Inner focusing system with USM
Closest focusing distance: 0.9 feet
Zoom system: Rotating type
Filter size: 77mm
Dimensions: 3.3 inches in diameter, 3.8 inches long
Weight: 1.1 pounds