ZEISS F1.4 Standard Prime/ ZEISS T Coating/ 11-Blade Circular Aperture/ SSM (Super Sonic Wave Motor)/ Dust And Moisture-Resistant Design/ Convenient Fingertip Control/ 35mm Full-Frame Format/ 50mm Focal-Length/ 12 Elements In 9 Groups/ Circular Aperture/ 0.15x Maximum Magnification Ratio/ 72mm Filter Diameter/ Black Finish