Tamron AF 17-50mm F/2.8 XR Di-II LD SP Aspherical (IF) Zoom Lens for Konica Minolta and Sony Digital SLR Cameras (Model A16M) Sony / Minolta -compatible lens designed specifically for digital SLR's 17-50mm focal range equivalent to 26-78mm in 35mm format Maximum aperture of f2.8 Filter diameter of 67mm Minimum focus distance of 0.27 meters over entire zoom range