Description
The Canon EF 11-24mm f/4L USM is an ultra-wide zoom for full-frame EOS bodies (17.6-38.4mm equivalent on APS-C), with a constant f/4 aperture for capturing dramatic landscapes and large interiors in a single frame.
Optics
One Super UD and one UD element reduce chromatic aberration, and four aspherical elements control distortion for edge-to-edge sharpness. Subwavelength and Air Sphere coatings limit backlit flare and ghosting for strong contrast even in harsh light.
Handling
A ring-type USM with internal focusing and a high-speed CPU gives fast, near-silent autofocus, with full-time manual override. Weather-resistant construction and fluorine coating on the front and rear elements suit demanding shoots, with a 9-blade rounded aperture for smooth bokeh. The lens accepts rear insert-type gelatin filters, cut to size behind the rear element.
