The Tokina AT-X 11-16mm Pro DX Autofocus SD EF-Mount lens is the perfect wide-angle zoom lens. This lens offers a constant maximum aperture, and cannot be used on cameras with full-frame sensors. The Tokina Advanced Technology Extra indicates that this lens was manufactured with new technologies and high-grade materials, making it a durable and long-lasting piece. With the Tokina Internal Focusing motor, the lens will not rotate its front element or change the size when focusing. These great features combined provide the perfect zoom lens for your Canon EF mount camera.