Large aperture standard zoom lens provides superior performance both for Digital SLR Cameras and 35mm Film SLR Cameras. To achieve an F2.8 aperture at all focal lengths, it employs three aspherical Lens to provide optimum aberration compensation. Two Special Low Dispersion (SLD) glass elements are provided for color aberration compensation, to assure high image quality. Features: Lens Construction: 14 Elements in 13 Groups Angle of View: 84.1 -34.3 degrees Number of Diaphragm Blades: 9 Blades Minimum Aperture: F32 Minimum Focusing Distance: 40cm Maximum Magnification: 1:3.8 Filter Size: Diameter 82mm Dimensions: Diameter 88.7mm X Length 115.5mm Weight: 715g