The FD 35mm F/3.5 S.C. is a wide-angle lens having 6 air-spaced elements and a 64 degree angle of view. It is very compact and inexpensive and is a perfect lens for snapshot photography. It produces sharp pictures from the center to edges throughout its entire focusing range even at maximum aperture. The lens has a CAT system pin which couples with a Flash-Auto Ring and the Speedlite 133D for automatic flash control. Even at full-aperture opening, it takes sharp images throughout the entire image. Equipped with a coupling pin to the Canon CAT System. SPECIFICATIONS Type: wide-angle Angle of view: 63 degrees Minimum Aperture: F/22 Closest Focusing Distance: 1ft 6in Filter size: 55mm Lenshood: optional BW-55A Length: 1 13/16 in Weight: 7 oz.