The Sony Alpha a7S Mirrorless Digital Camera features a full-frame 12.2MP Exmor CMOS sensor and BIONZ X image processor to enable notable video and still image quality with an expansive dynamic range, low noise, and extended sensitivity to ISO 409600. At the sensor level, this full-frame sensor features a unique on-chip gapless lens design, which incorporates small lenses between neighboring pixels in order to increase light-gathering efficiency and promote greater image quality across the entirety of the sensor plane.
The sensor and processor combination also avails a wealth of speed throughout the camera system, including a top continuous shooting rate of 5 fps, support for 4K video recording, and a fast 25-point contrast-detection AF system with sensitivity to -4 EV.
50Mbps XAVC S 1920×1080 at 60P, 1280×720 at 120P
For the first time ever in a Sony DSLR camera, the a7S adopts the workflow-friendly XAVC- S recording format in addition to AVCHD and MP4 codecs. XAVC-S format allows for full HD recording at a data rate of 50 mbps with lower compression for improved video quality. The a7S can record full HD (1920×1080) at frame rates of 60p, 60i, 30p and 24p directly to a compatible memory card. Video modes can be changed from full-frame to APS-C (super 35mm equivalent) if desired, and in this crop mode, the camera can support high frame rate 120fps shooting at standard HD resolution (1280 x 720p), creating a 5x slow-motion effect.
In video mode, the A7s can output 4K video at UHD (3840×2160) in 4:2:2 to an optional external 3rd party 4K recorder via the HDMI1.
The A7s comes standard with an E-mount to EF Metabones adapter and can be fitted with a PL lens mount.