Prime wide-angle lens is designed for APS-CT-format Sony E-mount mirrorless cameras and provides a 35mm equivalent focal length.Bright f/1.4 maximum aperture suits working in low-light conditions and also affords greater control over depth of field.Two extra-low dispersion elements reduce color fringing and chromatic aberrations in order to achieve a high degree of clarity and color accuracy.Two high refractive index 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.Additionally, an 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.Nine-blade diaphragm contributes to a pleasing bokeh quality.