APS-C Format Min.Focal Length (FF): 16mm Max.Focal Length (FF): 50mm Maximum Aperture Range: 3.5-5.6 Aspherical Elements: 4 ED Glass Elements: 1 Number of Aperture Blades: 7 Circular Aperture: Yes Minimum Focus Distance: 0.25m (W) Maximum Magnification Ratio: 0.215x Filter Diameter: 40.5mm Dimensions (DxLmm): F66x31.3 Weight: 107 g Linear Response MF: Yes AF Actuator: Linear motor