Tokina AF 16-50mm f/2.8 AT-X 165 Pro DX

Manufacturer's Description:

"The new Tokina AT-X 165 Pro DX gives the digital photographer the equivalent of a 24-75mm lens in 35mm camera terms with a bright f/2.8 constant aperture. One-Touch Focus Clutch Mechanism makes switching between auto and manual focus as easy as snapping the focus ring back and forth. The front element of the AT-X 165 Pro DX has a newly formulated WP or Water Proof optical coating on the glass. This new coating makes marks such as spots left by water or finger-prints much easier to clean than standard multi-coating. The rear optical group of the lens contains 1 SD (Super-Low Dispersion) glass element to reduce the number of elements in the optical design in order to make the lens more compact, light-weight and faster focusing."