Focal Length : 17 - 40mm
Maximum Aperture : 4
Minimum Aperture : 22
Lens Construction : 12 elements in 9 groups
Diagonal Angle of View : 104o - 57o 30'
Focus Adjustment : Inner focusing system with USM
Closest Focusing Distance : 0.28m / 0.9 ft.
Zoom System : Rotating type
Filter Size : 77mm
Dimensions (D x L) : 83.5mm x 96.8mm (3.3" x 3.8")
Weight : 500g (1.1 lb)
Lens Dust Cap
Canon EF 17-40mm F4L USM Lens
from faroe island on 2014-02-13
really good lens ;)
the 17-35mm is better in low light, but this one is really good too both in low light and day light ;)