Prime wide-angle lens is designed for full-frame-format Sony E-Mount mirrorless cameras, and when used with APS-C format cameras, it has the equivalent perspective of a 52.5mm lens. Bright f/1.8 maximum aperture suits working in low-light conditions and also affords greater control over depth of field. Two extra-low dispersion elements and two high transparency elements reduce color fringing and chromatic aberrations in order to achieve a high degree of clarity and color accuracy. Two aspheric elements help to control spherical aberrations and reduce distortion in order to realize high sharpness and accurate rendering. HD nano multi-layer coating has been applied to individual elements to suppress flare and ghosting for greater contrast and color fidelity when working in strong lighting conditions. STM stepping motor enables quick, quiet, and precise autofocus performance along with full-time manual focus override. The internal focusing design maintains the overall lens length during use for improved handling and quicker response. Integrated manual aperture ring for tactile exposure control; this ring also features an 'A' position for automated, camera-based aperture selection. The lens can be set to the deep focus position for working with distant subjects. Or to the Close-up position for working with subjects as close as 40cm/1.31ft away, and giving a pleasing bokeh quality. Integrated manual aperture ring for tactile exposure control; this ring also features an 'A' position for automated, camera-based aperture selection. Integrated micro-USB port for firmware updates.