The Tokina 11-16mm f/2.8 AT-X116 Pro DX II Digital Zoom Lens is an ultra-wide angle lens designed for Canon EOS cameras with a fast f/2.8 aperture for better photography in low-light situations. This lens has a slightly shorter zoom range to maintain optical quality at wide apertures. Tokina"s exclusive One-touch Focus Clutch Mechanism allows the photographer to switch between AF and MF simply by snapping the focus ring. Water Repellent Optical Coating to protect the lens during inclement weather.