Tokina AF 20-35mm is wide angle zoom lens that produces dynamic images with edge-to-edge sharpness. It's lens is constructed using multi-coated elements to promise a balanced descriptive performance throughout its focal range and to produce beautiful images at large aperture settings. fast maximum aperture provides effortless shooting in challenging lighting situations. The all-The large angle of view, ideal for capturing the extensiveness of a scene, is suited for landscape and architecture/interior photography. The 20-35mm concerts 13 elements in 11 groups, six diaphragm blades, 1.4 feet close focusing distance, 93°-63° viewing angle and 77mm filter thread.