Ultra-wide prime designed for APS-C-format Canon EF-mount cameras, this lens provides a 17.6-25.6mm equivalent focal length range.
Bright constant f/2.8 maximum aperture affords consistent brightness throughout the zoom range and offers improved control over depth of field.
Two aspherical elements, including one large-diameter molded element, help control spherical aberrations and distortions for sharper, more accurate rendering.
Two SD low dispersion elements control color fringing and chromatic aberrations throughout the zoom range for greater clarity and color accuracy.
Multi-coated elements suppress flare and ghosting for improved contrast and color accuracy when working in strong lighting conditions.
Autofocus system uses an internal focusing design for quick and responsive performance.
One-Touch Focus Clutch Mechanism avails quick switching between autofocus and manual focus settings by either pushing or pulling the focus ring. When set to manual, focus response is especially smooth and benefitted by hard stops at the ends of the focusing range.