Buy from Amazon.com : http://fave.co/1CrYT0r

Sigma 105mm f/2.8 EX DG Medium Telephoto Macro Lens for Minolta and Sony SLR Cameras

Product Description :
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
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
Maximum magnification of 11