Tokina 11-20mm f/2.8 AT-X PRO DX SD

The Tokina 11-20mm f/2.8 AT-X PRO DX is a versatile wide-angle lens designed for APS-C sensors, available for Canon EF and Nikon F mount DSLRs. The Tokina 11-20mm features a constant maximum aperture of f/2.8 across the zoom range with a minimum aperture of f/22, and a 9-blade diaphragm. Construction consists of 14 elements in 12 groups, including three SD ultra-low dispersion elements as well as one P-MO hybrid aspherical and two glass-molded aspherical elements. Focus is internal and features Tokina's One-Touch Focus Clutch mechanism for quick switching between autofocus and manual focus modes.