This lens when released had the world's fastest aperture of F/2 among the 28mm lenses. With the Canon Floating System, which prevents aberration in shots at a close distance, and the Super Spectra Coating, which eliminates ghosts and flares, the FD 28mm F/2 S.S.C. lens offers a high contrast and sharp picture image even with full aperture opening. SPECIFICATIONS Type: wide-angle, Angle of view: 75 degrees, Minimum Aperture: F/22, Closest Focusing Distance: 1ft. Filter size: 55. Length: 2 3/8 in, Weight: 12oz.