The EF 24mm f/1.4L II USM is a Canon L-series lens characterized by a robust physical construction and sophisticated optical design. This lens sports a ring-type USM for quick and quiet autofocus performance and full-time manual focus override
The EF 24mm f/1.4L II USM has a large maximum aperture of f/1.4, making hand-held shooting possible in low light. Such large apertures can be used to restrict depth of field, even at such short focal lengths. Circular diaphragm blades result in smooth out-of-focus regions (bokeh). For optimum visual performance, the lens incorporates two types of special elements: aspherical elements to correct spherical aberrations, and Super UD (ultra-low dispersion) elements to eliminate secondary chromatic aberrations. The result is crisp, high contrast and undistorted image quality all the way across the frame.