The Canon EF 17-40mm f/4L USM is a new and affordable L-series ultra-wide-angle zoom lens that’s ideal for both film and digital SLRs. (The sample photos are copyrighted by the owner. You may click at the thumbnails and see the original pictures.)

Focal Length 17-40mm
Maximum Aperture f/4
Angle of View 104°-57° 30'
Focus Adjustment Inner focusing system with USM
Closest Focusing Distance 0.28m / 0.9 ft.
Filter Size 77mm
Max Diameter x Length 3.3" x 3.8" / 83.5 x 96.8mm
Weight 500g
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Sample Videos

Canon EF-S 17-40mm f4L USM lens review
Canon EF-S 17-40mm f4L USM sample video