The Sony Alpha A7S III is optimised for video, sensitivity and speed. It is a full-frame mirrorless camera with a 12.1MP CMOS sensor. In addition it features improved noise reduction, a wider dynamic range, and UHD 4K 120p 10-bit 4:2:2 video recording.
Video is the primary application of the a7S III. Improvements include faster readout speeds and greatly reduced rolling shutter, along with high-bitrate internal recording. In addition, output 16-bit raw via the full-size HDMI port. The Sony A7S III also does away with recording time limits. Finally, it incorporates HLG for direct HDR production as well as S-Log2/S-Log3 gamma profiles for advanced HDR productions.
Autofocus performance is outstanding, with intelligent subject tracking and Real-time Eye AF. This ensures critical focus on moving subjects in all recording modes. Sensitivity range is available from ISO 40-409600. The A7S 3 can handle 10 fps continuous shooting for up to 1000 consecutive raw frames. Additionally, 5-axis image stabilisation minimises the appearance of camera shake by up to 5.5 stops.
The a7S III includes a rear articulating LCD and a 9.44m-dot OLED electronic viewfinder. The camera’s new menu system provides intuitive navigation. Additionally, dual memory card slots both support CFexpress Type A or SD UHS-II. This provides flexible and high-speed file storage.
Back-illuminated 12.1MP CMOS Sensor
A redesigned 12.1MP full-frame CMOS sensor now features a back-illuminated Exmor RS design. This achieves improved clarity and reduced noise. In addition, impressive sensitivity, from ISO 80-102400 with an extended ISO 40-409600 range.
Recording up to UHD 4K is possible with frame rates up to 120p. This utilises full 1:1 pixel readout without binning. Internal 10-bit 4:2:2 sampling is also possible in all recording modes.
The high-speed, 120 fps recording also enables 4x and 5x slow-motion. In Full HD resolution, an effective 240p frame rate is also available.