Large F1.8 maximum aperture enables beautiful defocusing effects, 7-blade circular aperture creates beautiful defocused bokeh- Compact, lightweight design ideal for full-frame E-mount cameras, Aspherical element controls spherical aberration and coma- Double-gauss configuration suppresses field curvature & distortion, Metal mount adds solid durability as well as a sophisticated feel, Fast DC motor focus actuator system drives all lens groups- Minimum focus distance:- 0.45 m (1.48 ft)- Filter Diameter (mm) :- 49 mm- Maximum Magnification ratio (x):- 0.14 x