The latest Tokina 16-50mm AT-X 165 Pro DX creates an outstanding standard lens, giving digital photographer the equal of a 24-75mm Lens in terms of film. Tokina’s exclusive One-touch Focus Clutch Mechanism lets you switch among AF and MF just by snapping the focus ring forward for AF and back toward the camera to focus manually. From natural world enthusiast to portrait artist to photojournalist, everybody will be able to be grateful for the AT-X 165’s brilliant 16-50mm F2.8 constant aperture.