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The Canon EF 17-40mm f/4L USM is a wide-angle zoom lens from Canon’s professional L-series lineup, designed for full-frame EF-mount cameras while remaining fully compatible with APS-C bodies. Its constant f/4 maximum aperture maintains consistent exposure and depth of field throughout the zoom range, making it a reliable choice for landscape, architecture, interior, and travel photography. Ring-type USM autofocus delivers fast, quiet focusing along with full-time manual focus override for precise control. The optical design incorporates aspherical and ultra-low dispersion elements to help minimize distortion and chromatic aberration across the frame. Built to L-series standards, the lens features a dust- and moisture-resistant construction suited to demanding outdoor and professional use. Its versatile wide-angle range makes it a popular choice for photographers needing a dependable, fast-handling zoom for expansive scenes.
– Focal length: 17-40mm
– Maximum aperture: f/4 (constant)
– Minimum aperture: f/22
– Lens mount: Canon EF
– Format compatibility: Full-frame and APS-C
– Autofocus motor: Ring-type USM with full-time manual focus
– Lens construction: 12 elements in 9 groups, including aspherical and UD elements
– Angle of view: Approximately 104° to 57°20′ (full-frame)
– Minimum focusing distance: 0.28m (11.0 in)
– Filter thread size: 77mm
– Build: L-series, dust- and moisture-resistant construction
