Lens Construction 11 Elements in 6 Groups Angle of View 180 degrees Number of Diaphragm Blades 6 Blades Minimum Aperture F22 Minimum Focusing Distance 13.5cm/5.3 in. Maximum Magnification 1:4.6 Filter Size Rear (Gelatin filter) Dimensions Diameter 73.5mm X Length 68.6mm 2.9 in. X 2.7 in. Weight 400g/14.0 oz Corresponding AF Mounts SIGMA