Large F1.8 maximum aperture enables beautiful defocusing effects7-blade circular aperture creates beautiful defocused bokehCompact, lightweight design ideal for full-frame E-mount camerasAspherical element controls spherical aberration and comaDouble-gauss configuration suppresses field curvature & distortionMetal mount adds solid durability as well as a sophisticated feelFast DC motor focus actuator system drives all lens groupsSmooth defocusingThe F1.8 maximum aperture opens up a world of beautiful prime-lens bokeh. The large F1.8 maximum aperture is also an advantage when shooting night scenes or in dimly lit interiors. When used with an a series camera body that features in-body image stabilization, even greater low-light capability enables handheld capture of clear images in dark scenes without having to use excessively high ISO sensitivity.7-blade circular apertureThe 7-blade circular aperture maximizes the beauty of large-aperture prime-lens, contributing to impressive images in which the subject stands out against a smoothly defocused background bokeh. Refined optical performanceThe lens has an innovative optical design to achieve clear, high-quality images by effectively minimizing distortion and chromatic aberration. A double-gauss configuration effectively suppresses field curvature and distortion, while a precisely placed aspherical element controls spherical aberration and coma for excellent optical characteristics right out to the image periphery....