CANON EF 24MM f/1.4 USM -- This professional wide-angle lens boasts an impressive maximum aperture of f/1.4. This is the first EF lens to employ both a replicated aspherical lens element to suppress distortion and spherical aberration, and a UD lens element to correct lateral chromatic aberration. Thanks to a floating construction, excellent corner-to-corner delineation is attained from 25 centimeters to infinity Max. diameter & length (mm) - 83.5 x 77.4 Weight - 550 grams