Sigma 12-24mm f/4.5-5.6 EX DG IF HSM Aspherical Ultra Wide Angle… Maximum Aperture: f/4.5-5.6. Type: Ultra Wide Angle Lens. Focus Type: Auto & Manual. This Sigma 12-24mm F4.5-5.6 lens has a large variable angle of view from 122° super wide-angle (at 12mm/diagonal axis) to 84.1°. The 4 Special Low Dispersion (SLD) glass elements enable effective compensation of color aberration, which is a common problem with super-wide angle lenses. Features an inner focusing system that keeps the length of the lens unchanged while controlling aberration; a minimum focusing distance of 11 at all focal lengths; and it’s equipped with a Petal-type hood to block out extraneous light. For use with Nikon cameras. Ultra wide angle zoom lens offers 122 degree view along the diagonal axis. F4.5-5.6 maximum aperture. Super Multi Coating reduces flare and ghosting. Lens Type: Wide Angle. Camera Lens Description: 24 month. Maximum Focal Length: 24 Millimeters. Minimum Focal Length: 12 Millimeters. Product Dimensions: 3.9 x 3.4 x 3.4 inches. Item Weight: 1.35 pounds. Item model number: 200306.