Canon EF 24mm f1.4L II USM

Manufacturer's Description:

"Featuring a 13-element, 10-group lens, the EF 24mm f1.4L II USM is designed to achieve the highest standards of image quality. Two high-precision GMo aspheric lenses are employed to correct various forms of aberration such as curvature of field and distortion, with a floating mechanism ensuring crisp corner-to-corner detail throughout the focal range. In addition, two UD lenses reduce the chromatic aberration common in wide-angle lenses"