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 […]