Sigma 50-100mm F/1.8 DC HSM Art Lens For Nikon F
Nikon F Mount/DX Format75-150mm (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