High performance fast F14 aperture standard 50mm prime lens with Full Frame Sensor Coverage Specialized Ultra MultiCoating UMC improves light transmission and reduces ghosting and flare Internal Focusing design IF provides non rotating 77mm filter threads and close focusing to 177 Inches Hybrid Aspherical and Aspherical lens elements control aberrations for clear and coloraccurate images Equipped with an 8 Blade Circular Diaphragm for pleasing Bokeh and a large rubberized focusing ring for quiet and silky smooth control of focus