Designed for Nikon pro DSLRs with full frame sensor, the Tokina AT-X Pro FX 16-28mm f/2.8 is a super wide angle zoom lens. The lens has 15 elements in 13 groups that include aspherical and super low dispersion glass elements to minimize chromatic aberrations while delivering maximum resolution. Its silent DC motor with GMR sensor enables the lens to focus quickly and quietly. Additional features include One-touch Focus Clutch mechanism, 107-76° viewing angle, 11 inch close focusing distance and nine-blade diaphragm.