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

The Canon EF 17-40mm f/4L USM is a full-frame L-series ultra-wide zoom lens in Canon EF mount, covering a focal range well suited to landscape, architecture, interior, and environmental portrait photography. The constant f/4 maximum aperture is maintained throughout the zoom range for consistent exposure across focal lengths. The optical design incorporates three aspherical elements and one UD lens element to control distortion and chromatic aberration across the wide field of view. Autofocus is driven by a ring-type USM motor for fast, quiet performance with full-time manual override. The L-series build includes dust and water resistant construction suited to use in varied shooting conditions. Compatible with full-frame and APS-C Canon EF-mount bodies and usable on RF-mount cameras via Canon’s EF-EOS R adapter.

– Canon EF mount full-frame L-series ultra-wide zoom lens
– 17-40mm focal length range
– Constant f/4 maximum aperture
– Three aspherical elements and one UD lens element
– Ring-type USM autofocus with full-time manual override
– Dust and water resistant L-series construction
– Compatible with full-frame and APS-C Canon EF-mount bodies
– Usable on RF-mount bodies via EF-EOS R adapter
– Filter thread: 77mm
– Minimum focus distance: 0.28m (0.92 ft)