The Sony a7S III is a video-focused full-frame mirrorless camera with a 12 Megapixel BSI CMOS sensor. It uses an all-new dual-chip Bionz XR processor, which offers considerably more horsepower, allowing for faster autofocus/auto-exposure as well as high bitrate video. The camera offers an ISO range of 80-102400, which expands to 40-409600.