The Sony a7S III is a highly capable full-frame mirrorless camera engineered for advanced video production and superior low-light imaging. It features a 12.1MP Exmor R BSI CMOS sensor and a powerful BIONZ XR processor, enabling internal 4K 120p recording at 10-bit 4:2:2. With an expansive ISO range, 15+ stops of dynamic range, and a fast hybrid autofocus system, it delivers pristine video quality and reliable performance in demanding environments, supported by 5-axis in-body image stabilisation.
Overview
- 12.1MP Full-Frame Exmor R BSI CMOS Sensor
- BIONZ XR Image Processing Engine
- Internal UHD 4K up to 120p recording
- 10-bit 4:2:2 internal recording in all modes
- 15+ Stops Dynamic Range
- High ISO sensitivity up to 409600 (expanded)
- Fast Hybrid AF with 759 phase-detection points
- 5-axis In-Body Image Stabilisation (IBIS)
- Dual CFexpress Type A / SD UHS-II Card Slots
- Fully articulating touchscreen LCD and high-resolution EVF
1x E-Mount Port Cap
1x a7s Rubber Eyepiece
1x SmallRig Master Cage for A7S III
1x SmallRig 15mm Rail Support System Baseplate
1x Short HDMI Cable
1x Sony CEA Standard Media Card Kit
1x Sony FX3/A7S MKIII Battery Kit
1x Sony Headphones
1x Sachtler Camera Bag (Small)
Unrivaled Low-Light Performance
The “S” in a7S stands for “Sensitivity,” and the a7S III truly excels here. Its 12.1MP full-frame sensor features large pixels, which, combined with the new BIONZ XR processor, allows for an extended ISO range up to 409600. This enables the camera to capture exceptionally clean and detailed footage in extremely low-light conditions with minimal noise, making it ideal for documentary, event, and nocturnal shooting where lighting is often challenging.
Advanced Video Capabilities
This camera is designed primarily with videographers in mind. It supports internal UHD 4K video recording at 120 frames per second, crucial for smooth slow-motion. A significant advantage is its ability to record 10-bit 4:2:2 colour internally in all recording modes, providing much greater flexibility and resilience during colour grading in post-production compared to 8-bit footage. It also offers multiple high-quality codecs including XAVC S-I (All-Intra) for robust editing.
Reliable Autofocus for Video
The a7S III incorporates a highly capable Fast Hybrid AF system, featuring 759 phase-detection points covering 92% of the sensor area. This system provides remarkably quick and accurate autofocus, even in challenging low-light situations (down to -6 EV). Its Real-time Tracking and Real-time Eye AF capabilities are particularly beneficial for keeping subjects in sharp focus during dynamic video shoots, minimizing the need for manual focus pulls.
Robust Image Stabilisation
The 5-axis in-body image stabilisation (IBIS) system offers up to 5.5 stops of compensation for camera shake, allowing for stable handheld shooting of both stills and video, especially useful for run-and-gun scenarios. For video, an “Active Mode” further enhances stabilisation, though it involves a slight crop of the image. This integrated stabilisation can reduce the reliance on gimbals in certain situations, providing more compact setups.
Professional Workflow Features
The a7S III is equipped with dual card slots that accept either CFexpress Type A cards (for highest bitrates) or UHS-II SD cards, offering versatile media options and redundant recording. It features a full-size HDMI Type-A port, capable of outputting 16-bit RAW video to compatible external recorders for maximum post-production flexibility. The fully articulating touchscreen LCD and high-resolution electronic viewfinder provide excellent monitoring options in various shooting positions. Its improved heat dissipation design also allows for extended recording times without overheating concerns.