Specifications : Lens Construction: 16 Elements in 15 Groups Angle of View: 84.1 - 39.6 degrees Number of Diaphragm Blades: 9 Blades Minimum Aperture: F22 Minimum Focusing Distance: 38cm / 14.9 in. Maximum Magnification: 1:5.8 Filter Size: Diameter 77mm Dimensions: Diameter 83.6mm X Length 87.2mm3.3 in. X 3.4 in. Weight: 550g/19.5 oz. Corresponding AF Mounts :Sigma, Canon, Nikon, Pentax, Konica-Minolta