Tamron SP AF17-50mm F/2.8 Di II LD Aspherical (IF) Lens with hood for Nikon-D DSLR Cameras Nikon-compatible lens designed specifically for digital SLRs 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