Autor: Redaktion

Sony Alpha 7S III

After almost five years, Sony introduces the new system camera: with outstanding low-light performance and 4K 120p video recording

Like the Alpha 7s II (released in 2015), the Alpha 7s III is also outstanding, especially in the lowlight range. As before, the company continues to exploit the fact that a comparatively low resolution of the sensor (around 12 megapixels) allows larger and therefore more light-sensitive pixels with a better dynamic range (15 exposure levels) and lower noise, even at high ISO values. The ISO range lies between ISO 80 and 409,600.
A new processor (BIONZ-XR processor) enables extremely efficient, eight times faster signal processing. This minimises calculation delays and the rolling h effect, in some cases by a factor of three.
For the first time a Sony Alpha offers a fold-out and rotatable display. The monitor is 3 inches in size, has a resolution of 1.44 megapixels and is designed for convenient touchscreen operation. The display is complemented by a high-resolution OLED viewfinder with 9.44 million pixels and a magnification of 0.9x.
In addition, the Alpha 7S III provides a selection of new Creative Looks with ten pre-sets that can be used for both photo and film shooting.

Sony has done without 8K but offers 4K-UHD with an h-pixel readout without pixel binning and without crop up to 4K/60p. The recording limit here is 1 hour. In 4K/120p mode it is 30 minutes. In this mode however with a slight crop with factor 1.1x.

The Alpha 7S III offers camera-internal 4K-UHD for recordings up to 120p and 4:2:2, 10-bit. In Full HD, the Alpha 7S III even records at up to 240p. A variety of recording modes are possible, including All-Intra (data rate up to 500 Mbit/s) and MPEG-H HEVC/H.265 coding (XAVC HS, data rate up to 200 Mbit/s). The Alpha 7S III also offers: S-Gamut, S-Gamut3 and S-Gamut3 Cine. In addition to the S-Log3 gamma curves, an HLG (Hybrid Log-Gamma) image profile is also available. Via the HDMI 2.1 output (Type A) the material can be exported with up to 4K-UHD 60p 16-bit RAW.

A digital audio interface has been added to the camera's MI (Multi Interface) accessory shoe. The XLR adapter kit XLR-K3M can be easily combined with the Alpha 7S III. This makes it possible to realize digital 4-channel/24-bit sound recordings. As usual, neither cables nor batteries are required for this MI accessory shoe.

Further Movie-Assist functionalities include a revised display design with individually adjustable zoom settings, regulation of white balance during recording, time-lapse, image extraction and much more.

The hybrid autofocus covers 92% of the image sensor and uses 759 spot sizes with phase detection and 425 with contrast AF. Autofocus also includes face/eye recognition, optimised for both human and animal eyes. Real-time tracking and real-time AF with eye detection are used for scenes with lots of movement. This makes it possible to focus continuously on the desired object. The autofocus measurements should be fast and precise, especially in the lowlight range, which is due to the sensitivity of -6 light values. The autofocus system also has several new functions.
These include AF Transition Speed, with seven settings that facilitate focus tracking, and five AF Subject Shift Sensitivity settings that allow the user to determine when the AF changes or stays on the subject. Touch Tracking not only allows the user to start real-time tracking, but also gives them the ability to rotate alone or with a gimbal. It is now possible to start Touch Focus on the LCD or via the Imaging Edge app from the smartphone during manual mode.

The design of the Alpha 7S III has been optimised for heat dissipation to prevent overheating. This also applies when recording 4K 60p 10-bit 4:2:2 video for more than an hour. A newly developed heat-dissipating and fan-less housing keeps the temperatures of the image sensor and processor within their normal operating range. This prevents overheating while maintaining a compact design. At the same time, the design ensures that the camera is protected against dust and moisture.

The A7S II has two combo slots, each of which can accept both SD cards and the faster CFexpress A type.

The new CFexpress Type A memory cards, which were first announced with the Alpha 7s III, have a write speed of 700 MB/s and a read speed of 800 MB/s, making them significantly faster than SD cards. The matching card reader, Sony MRW-G2, will also be available in September.

The camera improves the quality of communication using multiple antennas, supporting 5GHz/2.4GHz WLAN (IEEE 802.11ac) and MIMO (Multiple-input And Multiple-output). Tethering via USB is also possible. When connected to a compatible 5th generation device (5G technology standard for mobile networks) via a USB cable, the 5G network can be used for fast and secure FTP file transfer. FTP transfer is available for both photos and videos. A SuperSpeed C-type USB connector for USB 5Gbps (USB 3.2) transmission is supplied. It enables high-speed remote transmission (tethering) and makes handling large image files easy.

Power is supplied by a Z-battery, which can be charged via USB-C and provides power for 600 photos or 95 minutes of video.

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