Lens Construction: 17 elements in 13 groupsNo. of Diaphragm Blades: 8Minimum Aperture: f/32Closest Focusing Distance (m): 4.5mMaximum Magnification (X): 0.12xAF Actuator: Ring USMFilter Diameter: 52mm drop-inMax. Length x Diameter (mm): 387 x 146mmWeight (g): 3870g