20mm F1.4 DG HSM | Art (Sony E-mount) firmware v02

It has improved the AF speed.It has improved the AF accuracy when the Face Detection setting is turned on, while using AF.With the Sony α9 or Sony α6400, it has corrected the phenomenon whereby the AF stopping position occasionally had a variation when shutter was half pressed repeatedly during auto focusing on the same subject. * For customers who have Sony α9, please update the camera’s firmware to Ver.5.00 or later.SIGMA 20mm F1.4 DG HSM | Art for Sony E-mount firmware Ver.02 is available for update at the following site.