SIGMA 50-100MM F/1.8 DC HSM ART LENS FOR CANON EF
Canon EF Mount/APS-C Format80-160mm (35mm Equivalent)Aperture Range: f/1.8 to f/16One SLD and Three FLD ElementsOne High-Refractive Index ElementSuper Multi-Layer CoatingHyper Sonic AF MotorInternal Zoom and Focus; MF OverrideRounded 9-Blade Polycarbonate DiaphragmFixed, Rotating Tripod Collar