The Sony Alpha a7S II is an ultra-sensitive, full-frame E-mount mirrorless camera and an update to the Sony Alpha a7S. Key features include:
Excellent low-light performance and color accuracy
5-axis image stabilization
Updated autofocus system
Uncompressed 4:2:2 UHD 4K video output
What’s New. Sony has essentially taken the groundbreaking a7S and added the best features found on the a7R II. Notable additions are 5-axis image stabilization, internal 4K capture, and improved ISO and AF performance.
12.2MP Full-Frame Exmor Sensor and BIONZ X Image Processor. While it’s technically the same sensor, Sony tweaked the sensor and processor for even better ISOperformance. The a7SII features a native sensitivity range of ISO 100-10,2400 (expandable to ISO 50-409,600).
Internal 4K Recording with Full Pixel Readout. The a7SII can record internal 4K video at 24/25/30 fps @ 100Mbps. Nearly as impressive is Full HD 1080p capture that tops out at 120 fps @ 100Mbps. Internally recorded video is in 8-bit 4:2:0, while clean HDMI outputs uncompressed 4:2:2 UHD4K to an external recorder.
Advanced Video Features. The a7S II supports the S-Log3 gamma curve, which extends dynamic range up to 14 stops.
5-Axis Image Stabilization. Like the a7II and a7RII, the a7S II includes built-in 5-axis image stabilization, which offers up to 4.5 stops of correction to any lens mounted. This includes angular shake (pitch and yaw), shift shake (X and Y axes), and rotational shake (roll). When using an E-mount lens that already features OSS, the two systems will work cooperatively for maximum stabilization.
Improved Autofocus System. The a7S II’s autofocus system provides improved accuracy and performance over its predecessor. For video and legacy-lens users, the manual focus peaking enables highly visible and accurate operation and can be optimized for full-frame or APS-C format shooting modes.
Other Notable Features.