Specifications : Lens Construction: 14 Elements in 10 Groups Angle of View: 102.4 - 63.8 degrees (Sigma SD format) Number of Diaphragm Blades: 6 Blades Minimum Aperture: F22 Minimum Focusing Distance: 24cm / 9.4 in. Maximum Magnification: 1:6.7 Filter Size: Diameter 77mm Lens Hood: Petal Hood Dimensions: Diameter 83.5mm X Length 81mm 3.3 in. X 3.2 in. Weight: 470g/16.6 oz. Corresponding AF Mounts :Sigma, Canon, Nikon, Pentax, Konica-Minolta