I was a bit worried when buying this zoom (very) wide angle. It took hundreds of pictures (I have a Canon 50D) to control the use (beware of cameras not held horizontally. But the distortions are spectacular, narrow street (think about putting the visor ) in cramped inside, the image quality is stirring (for an amateur). In addition, icing on the cake, a DxO module would be available in October to help with software correction ... I recommend without reservation this goal for lovers who find naked low prices ... Canon 10-22