Sigma 30mm F2.8 DN Lens for Sony E-mount Cameras (Black) 2 ultra-low-dispersion (UD) glass elements and rear focusing system Ultra-sonic monitor (USM) for quick, highly accurate autofocusing 4.9-foot close focusing distance; produces natural-looking background blur Angle of View 39.6 degrees(Sony E-mount 50.7 degrees) NOTE: Please refer the Compatibility Chart and the User Manual before use.