EF 17-40mm f4L USM

introduced 2003

Focal length and maximum aperture: 17-40mm 1:4
Lens construction: 12 elements in 9 groups
Diagonal angle-of-view: 104°-57° 30'
Focus adjustment: ring-type USM, inner focusing system, full-time manual focus
Closest focusing distance: 0.28 m/ 0.9 ft., 024 x magnification
Zoom system: rotation type
Filter size: 77mm
Max. diameter x length, weight: 83.5 x 96.8mm, 475g