Canon EF 28mm f/1.8 USM Wide Angle Lens for Canon SLR Cameras Measures 2.7 inches in diameter and 1.7 inches long , weighs 6.5 ounces.This lens takes a 58mm filter. Focal length: 28mm, Closest focusing distance: 1 foot Broadens angle of view and increases depth of field to bring more area into focus 28mm wide-angle lens with f/1.8 maximum aperture for Canon SLR cameras.Max. Diameter x Length, Weight:2.9 x 2.2, 10.9 oz. / 73.6 x 55.6mm, 310g High-precision aspherical lens minimizes distortion and other aberrations; Refer user manual under technical specification for troublr shooting steps