Sigma 17-70mm f/2.8-4.5 DC Macro Lens for Nikon Digital SLR Compact High Performance Lens and optimized for Digital SLR cameras Multi layer lens coating and lens design reduce flare and ghost Aspherical and SLD lenses, offer excellent correction for various aberrations. Minimum focusing distance of 7.9", maximum magnification of 1:2.3 Large aperture of F2.8 at wide angle.