EX DG Lenses are designed for digital SLR cameras as well as 35mm film cameras. The power layout of the lens is specially optimized for digital SLR cameras, and Super Multi Coating gives superb color performance whilst cutting down flare and ghost. Two SLD (special low density) elements and four aspherical lenses provide correction against distortion as well as all types of aberration, especially spherical aberration. Features: Super Multi Layer (SML) coating reduces ghost and flare Two pieces of Special Low Dispersion (SLD) elements and four aspherical lenses provide high quality images throughout the entire zoom range Minimum focusing distance of 33cm (13 ) at all focal lengths The inner focus system allows the lens to focus without rotating the front element, therefore a Petal-type hood and circular polarizing filters are easily used Specifications: Focal length: 28-70mm Minimum aperture: F22 Lens construction: 14 elements in 12 groups Angle of view: 75.4-34.3 degrees Number of diaphragm blades: 9 pcs Overall lens length: 87.2mm (3.4 ) Maximum diameter: 74mm (2.9 ) Filter size: 67mm Lens hood: petal shape bayonet Weight: 510g (18 ozs.) Minimum focusing distance: 33cm (13 ) at all focal lengths Maximum magnification ratio: 1:4.4