Sony A7S III Mirrorless Digital Camera Body
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Sensitivity, speed and supreme imagery
The Alpha 7S III features a newly developed 12.1-megapixel1Full-frame Backside-illuminated (BSI) Exmor R CMOS sensorthat delivers sensitivity, speed and superior images and movie. Ittakes full advantage of the large pixels and BSI copper wiring structure to more than double the sensitivity and readout speed. The results are astounding, with phenomenal low-light capability, up to 15+ stops of dynamic range and drastically reduced noise for ultra-sharp and clean images and 3x reduced rolling shutter2.In addition, this new Exmor R sensor features Sony’s acclaimed fast hybrid autofocus with 759 phase detection AF points and 92% coverage. The high sensitivity also allows it to autofocus in light as low as EV-6.
8x more processing power
A new BIONZ XR processing engine delivers 8x more processing power than previous models. It not only supports the high sensitivity and wide dynamic range that hasbecome hallmarks of the “S” series, but also high-speed features such as real-time AF tracking and up to 10fps continuous shooting of more than 1000 RAW still images. This new BIONZ XRengine can process large volumes of data in real time, making full-frame readout without pixel binning possible in all recording modes, including 4K 120p5All-I 10-bit 4:2:2.Whether shooting stills or movies, the Alpha 7S III offers overwhelming image quality with stress-free operation.
Legendary low-light and 15+ stops dynamic range
The Alpha 7S III builds on the legendary low-light performance synonymous with Sony’s ‘S’ series. The 12.1MP sensor is optimized for 4K with full-pixel readout and to make use of much larger individual pixels for maximum light gathering capabilities and low signal-to-noise ratio. Fewer pixels mean each individual pixel is larger than on other higher pixel-count full-frame sensors. The Alpha 7S III also employs Sony’s industry-leading Exmor R backside-illuminated CMOS image sensor technology for additional low light performance and to double the readout speed. Base ISO is lower than previous ‘S’ models, with a still and movie range from 80 to 102,400, expandable to 40 to 409,600 for stills and 80 to 409,600 for movies. Thanks to the high-sensitivity, Exxmor R sensor and fast processing, the dynamic range for movies is an impressively wide 15+ stops.
High speed for slow motion
The Alpha 7S III offers several in-camera 4K recording modes to match your creative need and desired format. 4K resolution at up to 120 frames per second5delivers extraordinarily smooth 5x (max.) slow-motion imagery. In addition to supporting 10-bit 4:2:2 recording, this feature can be used with efficient inter-frame (Long GOP) compression or high-quality intra-frame (All-I) compression. A maximum bit rate of 1200 Mbps (4:2:2 10-bit, H.264, All-I)5delivers supreme image quality when directly replaying movies in slow or quick motion in the S&Q mode. Up to 10x slow motion with Full HD resolution is possible at 240 fps (24p recording), providing fresh perspectives on dynamic sports and other types of action.
Effective heat dissipation for extended recording times
Heat buildup from processing large volumes of data when recording high-bitrate, high-resolution 4K 60p and 120p movie can plague other systems, but not the Alpha 7S III. Camera-wide passive heat dissipation is optimized using Sony’s unique S (sigma) graphite heatsink to keep the image sensor and image processing engine temperatures within their normal operating range, preventing overheating. This makes it possible to record 4K 60p video continuously for up to an hour7. Even XAVC S-I 4K 60p 10bit 4:2:2 All-I can be recorded for over an hour until battery ends20and XAVC S-I 4K 120p 10bit 4:2:2 All-I can record over 30 minutes until 2nd media gets full20. Impressive heat management is achieved without sacrificing weather sealing and class leading small size and weight, which has become a hallmark of Sony’s a series E-mount cameras.
10-bit 4:2:2 video reaches new levels of realism
The a7S III can record 10-bit 4:2:2 video internally when using Long GOP or All Intra compression, making it possible to grade for fuller, more natural gradations while generally providing greater editing freedom. Maximum frame rate when recording full-frame 4K is 120p
All Intra (for XAVC S-I™ recording)
In addition to the Long GOP inter-frame compression used in previous models, the a7S III supports intra-frame (All-I) recording for the first time in an a body, allowing internal 4Krecording at bitrates up to 1200 Mbps5. Intra-frame recording provides extra margin for post production and still image extraction when needed.
Efficient MPEG-H HEVC/H.265 (XAVC HS™) coding
In addition to Sony’s common XAVC S™(MPEG-4 AVC/H.264) codec found on current models, the a7S III adds XAVC HS format recording21using the MPEG-H HEVC/H.265 codec for approximately twice the efficiency of XAVC S. You can record more detailed 10-bit 4Kvideo at higher bit rates while keeping data volume within a manageable range. Image quality is better than XAVC S at a comparable bit rate, and equal to XAVC S at lower bit rates. H.265 video can be recorded internally to SDXC or CFexpress Type A memory cards.
16-bit RAW output for movie
The a7S III is capable of16-bit RAW output up to 4K 60p to an external device6via HDMI, to answer the increasing demand for RAW recording for applications that demand the highestquality and post-production flexibility provided by RAW output. Full-frame 4264 x 2408 (16:9 aspect ratio) 16-bit image output is possible, with a choice of frame rates (60p/50p/30p/25p/24p). You can also output RAW video via HDMI while recording XAVC HS 4K, XAVC S 4K, or XAVC S-I 4K to internal card media. Proxy recording is available during RAW output.
Easy S-Log matching with professional camcorders
In many moviemaking workflows the ability to match the color of footage from multiple cameras is essential. The a7S III includes S-Log2 and S-Log3 gamma curves, the latter emphasizing shadow to mid-tone gradations and making it possible to achieve a dynamic range of 15+ stops4. Three color gamut settings are provided: S-Gamut, S-Gamut3, and S-Gamut3. Cine. The S-Gamut3 and S-Gamut3.Cine color gamut settings make it easy to match a7S III footage with that shot on professional camcorders equipped with S-Log3 gamma curve settings. Minimum ISO when shooting S-Log has been reduced to 640, and the 160 to 500range of expanded ISO can be used as well. Sensitivity can be lowered by as much as 2 stops below the normal ISO range for extra-low-noise recording.
Tenacious Real-time Tracking
AI-based Real-time Tracking with a 30% improvement in subject detection performance thanks to the new BIONZ XR processing engine and anew subject recognition algorithm uses color, pattern (brightness), distance (depth), face and eye information to process spatial information in real time at high speed. The focus area will seamlessly change between face and eye to object tracking according to the condition of the subject.
Real-time Eye AF
Real-time Eye AF employs artificial intelligence to detect and process eye data and track the subject’s eye with unprecedented precision. The superior real-time data processing capability of the new BIONZ XR image processing engine provides a 30% improvement in subject detection performance over previous BIONZ X systems, ensuring accurate, reliable detection even when faces are looking away at extreme angles. Real-time Eye AF is simultaneously initiated when the Touch Tracking feature is used. Sony’s Eye AFeasily tracks a subject’s eye in all movie and still shooting modes with human Eye AF available in both modes while animal Eye AF is selectable for stills. In addition to automatic eye selection, it’s possible to manually preselect the subject’s right or left eye.
Accurate AF in low light
Updated AF algorithms achieve high AF precision down to light levels as low as EV-6 (ISO 100 equivalent, F2.0lens, AF-S mode). Focus can be accurately and reliably acquired in light so low that the subject would be difficult to see clearly with the naked eye.
Active Mode stabilization for handheld movie shooting
The a7S III features highly effective 5-axis in-body image stabilization with any lens attached. The powerful BIONZ XR image processing engine with advanced real-time processing, utilizes gyro sensors, plus optimized image stabilization algorithms to combine the new high-precision 5-axis stabilization unit with electronic Active Mode24stabilization for movie shooting in 4K and other formats. This makes handheld shooting as stable as you can get without having to use a gimbal. Using optically stabilized lenses further enhance stability as the camera uses both in-body and optical lens stabilization together as well.