Buy from Amazon.com : http://fave.co/1CsnUc2
Sigma 105mm f/2.8 EX DG Medium Telephoto Macro Lens for Canon SLR Cameras
Product Description :
Compact and lightweight medium telephoto macro lens
Optimized image quality for Digital SLR cameras
Maximum magnification of 11
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