The Tokina 11-16mm f/2.8 AT-X 116 Pro DX Autofocus Lens for Nikon DX-Format DSLRs is an ultra wide angle, short zoom range lens specifically designed for use with select Nikon DX-format digital SLR cameras. The slightly shorter zoom range of this lens over the popular and award winning 12-24mm lens makes it possible to maintain optical quality even at wide-open apertures. This lens features a fast constant aperture of f/2.8, and provides a focal length equivalent to 16.5-24mm in 35mm format.
As part of the AT-X line, this lens is designed to provide excellent optical quality, and offers advanced features like the WR (Water Resistant) front element, its One-touch Focus Clutch Mechanism, that allows the photographer to switch between AF and MF simply by snapping the focus ring forward for AF and back toward the camera to focus manually. Also, it has a 9-bladed aperture for smooth out of focus areas.