Sigma 20mm f/1.8 EX Aspherical DG DF RF Autofocus Lens for Canon EOS Type: Wide Angle Lens Focus Type: Auto Focus Diameter: 82mm Compatibility: For Canon Features: This super-wide-angle lens is ensured minimal light-fall-off with superior peripheral brightness. The iris diaphragm has 9 diaphragm blades to obtain beautiful out of focus images in the foreground and background. This is an ideal DG lens optimized Digital SLR camera. Minimum focus distance of 20cm (7.9 in.) The minimum focusing distance