One of the fastest lenses available in this focal length. Sharpness, contrast and freedom from distortion are this lens' strong points. Especially important is its ability to make the most of color films when photographing in low light conditions. Thanks to the inclusion of the Canon Floating System, superb image quality is insured at every aperture and distance in its focusing range. SPECIFICATIONS Type: super-wide-angle Construction: 10 elements in 9 groups Angle of view: 94 degrees Minimum Aperture: F/22 Closest Focusing Distance: 8.8in Filter size: 72 Lenshood: optional BW-72 Length: 2 1/4 in Weight: 11oz.