Sigma 105mm f/2.8 EX DG Medium Telephoto Macro Lens for Sigma SLR Cameras Compact and lightweight medium telephoto macro lens. Optimized image quality for Digital SLR cameras. Super Multi Layer (SML) coating reduces the ghost caused by reflections from thesurface of digital image sensors Maximum magnification of 1:1 Focus Limiter Switch that limits the AF range so improving the speed and accuracy of auto focus Dual Focus (DF) system that is designed to make the lens easy to hold during auto focusing