ts general wide-angle field of view suits photographing a wide variety of subjects and the fast f/1.4 maximum aperture benefits working in low-light conditions and also enables working with shallow depth of field techniques. The optical design incorporates a pair of aspherical elements and two high refractive index elements to suppress spherical aberrations in order to achieve a high degree of sharpness and clarity throughout the aperture range. An Ultra Multi-Coating has also been applied to control flare and ghosting for increased contrast when working in strong lighting conditions. The lens's Linear Super sonic Motor works in conjunction with Sony cameras' AF systems for quick and precise focusing performance. Additionally, a nine-blade circular diaphragm contributes to smooth, rounded bokeh.