Sony Alpha a7S Mark III Mirrorless Digital Camera Body
The Sony Alpha a7S Mark III Mirrorless Digital Camera Body raises the bar for what a full-frame mirrorless camera is capable of with features including optimised video, sensitivity and speed. A revised 12.1MP Exmor R BSI CMOS sensor and updated BIONZ XR image processor offer faster performance, improved noise reduction, and a wider dynamic range, along with UHD 4K 120p video recording and internal 10-bit 4:2:2 sampling.
The updated sensor design of the Sony A7SIII also brings improved autofocus performance via 759 phase-detection points, which offer intelligent subject tracking and Real-time Eye AF to ensure critical focus on moving subjects in all recording modes. The sensor and BIONZ XR processor also facilitate impressive sensitivity, with an expanded range from ISO 40-409600, as well as fast 10 fps continuous shooting for up to 1000 consecutive raw frames. Additionally, 5-axis SteadyShot INSIDE sensor-shift image stabilization is available, too, which minimizes the appearance of camera shake by up to 5.5 stops.
Complementing the imaging assets, Sony has also made some changes to the a7S III's physical design, including a rear LCD with a side-open articulating design and an impressive 9.44m-dot OLED electronic viewfinder. The camera's menu system has also been updated for more intuitive navigation and the body design helps to promote better heat dissipation for improved continuous recording capabilities. Additionally, dual memory card slots both support working with CFexpress Type A or SD UHS-II memory cards for flexible and high-speed file storage.
12.1MP Exmor RS BSI CMOS Sensor and BIONZ XR Image Processor
UHD 4K 120p Video, 10-Bit 4:2:2 Internal Recording
Fast Hybrid AF System
5-Axis SteadyShot INSIDE Image Stabilization
Body Design and Connectivity
- An impressive QXGA OLED Tru-Finder EVF features a high 9.44m-dot resolution and 0.9x magnification for exceptionally bright, clear, and detailed eye-level viewing. This viewfinder has a dedicated 120 fps High Quality setting for smooth motion rendering and the finder's physical design has a long 25mm eye point, 41° field of view, and features a fluorine coating on the outermost viewfinder element to benefit cleaning.
- A first for a7-series cameras, a side-opening 3.0" 1.44m-dot vari-angle articulating screen benefits working from high and low angles as well as a front-facing position for vlogging or other self-recording needs. This LCD is a touchscreen, too, for intuitive shooting control and menu navigation.
- Dual memory card slots both accept either CFexpress Type A or SD-type memory cards. The dual slot design allows for flexible file saving and handling and can be configured to partition file types or can be used for overflow recording. Additionally, both of the card slots are rated to support UHS-II memory cards for faster transfer speeds.
- Redesigned menu structure is more intuitive and complements having different workflows and settings selections for movie recording and stills shooting. The menu system also works in conjunction with the touchscreen design of the rear LCD.
- Magnesium alloy chassis assures rigidity, durability, and stability while remaining lightweight. The lens mount has also been improved to better support heavy lenses, and the grip rigidity has been improved for more comfortable hand-holding.
- Extensive weather-sealing, including enhanced sealing around the battery cover, terminal cover, and chassis joints, has been employed to resist dust and moisture for reliable operation in harsh weather conditions.
- Accepts the high-capacity NP-FZ100 rechargeable lithium-ion battery, which provides approximately 510 shots/80 minutes of recording per charge when using the viewfinder or 600 shots/95 minutes of recording per charge when using the rear LCD.
- Full-size HDMI A port offers a more reliable connection when working with external recorders.
- A USB 3.2 Gen 1 Type-C port has been added, in addition to a micro-USB port, for faster, more reliable tethering support. The USB Type-C connection allows the camera to be charged or powered from the host power source while connected.
- Both 3.5mm headphone and external microphone ports facilitate greater control over audio recording.
- Multi Interface Shoe supports working with the optional ECM-B1M Shotgun Microphone or XLR-K3M XLR Adapter Kit, which provide improved, clear audio recording sound by sending a digital audio signal to the camera, opposed to an analog signal.
- Built-in Wi-Fi enables the remote camera control and instant sharing of imagery to mobile devices for direct sharing online, and support for both 2.4 and 5 GHz bands also enables wireless tethered shooting support. This connectivity also provides remote camera control
- USB Type-C port can be paired with an optional Ethernet wired LAN adapter to provide 1000BASE-T connectivity, wired remote shooting, or FTP transferring.
Video is the primary application of the a7S III, and improvements to the sensor and processor enable faster readout speeds and greatly reduced rolling shutter, along with high-bitrate internal recording, 16-bit raw output via the full-size HDMI port, and flexible control over motion with variable frame rate selection. The a7S III also does away with recording time limits and incorporates HLG for direct HDR production as well as S-Log2/S-Log3 gamma profiles for advanced HDR production with editing.
At the heart of the new Sony Alpha III is a 12 megapixel full-frame sensor that has been improved compared to the Alpha 7S II. Sony is now opting for a construction with back exposure (BSI), with which more light can be captured and which enables better results with low light shots. The maximum sensitivity is still ISO 409.600 (expandable down to up to ISO 40). The sensor is supported by the new BIONZ-XR processor, which is said to have eight times as much computing power as the previous image processor. Sony is also breaking new ground in operation: For the first time in the Alpha 7 series, a fully moveable monitor (3.0 inches, 1.44 million points) was installed, which now also allows touch operation of the menus. The structure of the menus has also been completely revised; among other things, only the relevant entries are available in photo and video mode for better clarity. The OLED viewfinder achieves a record resolution of 9.44 million points and a magnification of 0.9x. Even glasses wearers have the entire picture in view, the size of the picture can also be reduced.
Sony A7sIII specs:
- New 12MP sensor with fast readout and S-Cinetone colorscience
- records FHD 240fps, 4k120fps 10bit 4:2:2 and 4K120fps raw over HDMI
- ONLY Up to 4k60 will be 10bit 4:2:2 internal.
- Downsampled 1080p from 4K, making this the best 1080p hybrid ever made! No line skipping or pixel binning.
- No internal RAW.
- 600mbps bitrate
- Base ISO 160 for S-LOG3
- no Dual ISO
- Max ISO 409600 (video)
- 16bit RAW output
- Sony claims 15 stops dynamic range
- Movie Edit add-on compatibility for Image Stabilization in post
- world’s highest resolution new 9.44 million dot EVF (QXGA resolution)
- same Sony A7rIV AF system
- new kind of passive (noise free) cooling system
- no overheating, no recording time limits (They are claiming to not have overheating issues for at least 1hr even at the highest framerate.)
- UHSII card and CFexpress Type A card support (each of th two slots takes them both!)
- Looks pretty similar to a Sony A7rIV.
- fully articulating screen like the one used by the Sony ZV-1.
- The video record button is now on the top of the camera, placed behind the shutter button
4K with 120p
One focus of the camera is video recording. Unlike Canon with the EOS R5, Sony does not use 8K for video, but continues to use 4K, which is said to achieve the best results so far with an alpha camera. The sensor’s 12 MP resolution enables a full-pixel readout without pixel binning and without crop up to 4K / 60p. In this setting, the recording limit should be one hour without overheating – the EOS R5 only manages 30 minutes at 4K / 60p. The video recording of the Alpha 7S III in 4K / 120p mode is limited to this length – by the way, a slight crop is used (1.1x).SonyAlpha
With Full HD, the Alpha 7S III even records at up to 240p. For time-lapse recordings, lower frame rates up to 1p can also be selected in S&Q mode. It is recorded internally with a color subsampling of 4: 2: 2 and a color depth of 10 bits. New codecs are available: XAVC-S-I records single images (All-I) with a data rate of up to 500 Mbits / s, XAVC-HS reduces the amount of data in image group compression to 200 Mbit / s thanks to H.265 compression. With HDMI 2.1, the camera can even output 4K / 60p as 16-bit raw files (ProRes Raw) to an Atomos recorder. Of course there is also a logarithmic gamma profile available (S-Log 2/3), which should enable a dynamic range of over 15 f-stops; the sensitivity starts here at ISO 640 (extended: ISO 160). According to Sony, the rolling shutter effect has been significantly minimized. The Alpha 7S III is equipped with a 5-axis image stabilizer in the housing, which, measured according to the CIPA standard, achieves an effectiveness of 5.5 f-stops; In video mode, digital stabilization (active mode) is also used, which also uses a gyro sensor. The information from this gyro sensor can also be stored in the metadata of the videos so that it can be used in post-processing for digital stabilization.
Fast autofocus and 10 frames/s
The hybrid autofocus covers 92% of the image sensor and uses 759 phase detection points and 425 with contrast AF. In addition to human, the AF algorithms now also recognize animal eyes – according to Sony, also at a greater distance than before. The AF sensitivity goes down to -6 EV series, the camera shoots at up to 10 frames / s. The mechanical shutter is designed for 1/8000 s.
Sony is using two memory card drives in the Alpha 7S III for the first time, which can use both SD cards (UHS-II) and the new CFexpress type A cards. They are smaller than Type B cards and faster than SD cards. For most video modes, SD cards of video classes V60 and V90 are sufficient; CFexpress is only required in S&Q mode with 4: 2: 2 color subsampling and 10 bit color depth. The series mode also benefits from the faster cards; 1000 uncompressed raws in a row should be possible here
|Lens Mount||Sony E|
|Camera Format||Full-Frame (1x Crop Factor)|
|Pixels||Actual: 12.9 Megapixel|
Effective: 12.1 Megapixel
|Maximum Resolution||4240 x 2832|
|Aspect Ratio||1:1, 3:2, 4:3, 16:9|
|Sensor Size||35.6 x 23.8 mm|
|Image File Format||JPEG, Raw, HEIF|
|Image Stabilization||Sensor-Shift, 5-Axis|
|ISO Sensitivity||Auto, 80 to 102400 (Extended: 40 to 409600)|
|Shutter Speed||1/8000 to 30 Second|
|Metering Method||Center-Weighted Average, Highlight Weighted, Multiple, Spot|
|Exposure Modes||Aperture Priority, Manual, Program, Shutter Priority|
|Exposure Compensation||-5 to +5 EV (1/3 EV Steps)|
|Metering Range||-3 to 20 EV|
|White Balance||Auto, Cloudy, Color Temperature, Color Temperature Filter, Custom, Daylight, Flash, Fluorescent (Cool White), Fluorescent (Day White), Fluorescent (Daylight), Fluorescent (Warm White), Incandescent, Shade, Underwater|
|Continuous Shooting||Up to 10 fps at 12.1 MP for up to 1000 Frames (Raw) / 1000 Frames (JPEG)|
Up to 8 fps at 12.1 MP
Up to 6 fps at 12.1 MP
Up to 3 fps at 12.1 MP
|Recording Modes||H.265/XAVC HS 4:2:2 10-Bit|
UHD 4K (3840 x 2160) at 23.976p/25p/29.97p/50p/59.94p/100p/119.88p [50 to 280 Mb/s]
H.265/XAVC HS 4:2:0 10-Bit
UHD 4K (3840 x 2160) at 23.976p/25p/29.97p/50p/59.94p/100p/119.88p [30 to 200 Mb/s]
H.264/XAVC S-I 4:2:2 10-Bit
UHD 4K (3840 x 2160) at 23.976p/25p/29.97p/50p/59.94p [240 to 600 Mb/s]
Full HD (1920 x 1080) at 23.976p/25p/29.97p/50p/59.94p [89 to 222 Mb/s]
H.264/XAVC S 4:2:2 10-Bit
UHD 4K (3840 x 2160) at 23.976p/25p/29.97p/50p/59.94p/100p/119.88p [100 to 280 Mb/s]
Full HD (1920 x 1080) at 23.976p/25p/29.97p/50p/59.94p/100p/119.88p [50 Mb/s]
H.264/XAVC S 4:2:0 8-Bit
UHD 4K (3840 x 2160) at 23.976p/25p/29.97p/50p/59.94p/100p/119.88p [60 to 200 Mb/s]
Full HD (1920 x 1080) at 23.976p/25p/29.97p/50p/59.94p/100p/119.88p [16 to 100 Mb/s]
|External Recording Modes||Raw 16-Bit|
4.2K (4264 x 2408) up to 59.94p
UHD 4K (3840 x 2160) at 23.976p/25p/29.97p/50p/59.94p
Full HD (1920 x 1080) at 23.976p/50p/59.94p
Full HD (1920 x 1080) at 50i/59.94i
UHD 4K (3840 x 2160) at 23.976p/25p/29.97p/50p/59.94p
Full HD (1920 x 1080) at 23.976p/50p/59.94p
Full HD (1920 x 1080) at 50i/59.94i
|Audio Recording||Built-In Microphone (Stereo)|
External Microphone Input
|Audio File Format||AAC LC, AC3, Dolby Digital 2ch, Linear PCM (Stereo)|
|Focus Type||Auto and Manual Focus|
|Focus Mode||Continuous-Servo AF (C), Direct Manual Focus (DMF), Manual Focus (M), Single-Servo AF (S)|
|Autofocus Points||Phase Detection: 759|
Contrast Detection: 425
|Autofocus Sensitivity||-6 to +20 EV|
|Viewfinder Type||Electronic (OLED)|
|Viewfinder Resolution||9,437,184 Dot|
|Viewfinder Eye Point||25 mm|
|Viewfinder Magnification||Approx. 0.9x|
|Diopter Adjustment||-4 to +3|
|Monitor Resolution||1,440,000 Dot|
|Monitor Type||Articulating Touchscreen LCD|
|Flash Modes||Auto, Fill Flash, Hi-Speed Sync, Off, Rear Sync, Red-Eye Reduction, Slow Sync|
|Maximum Sync Speed||1/250 Second|
|Flash Compensation||-3 to +3 EV (1/3, 1/2 EV Steps)|
|Dedicated Flash System||TTL|
|External Flash Connection||Hot Shoe|
|Memory Card Slot||Dual Slot: CFexpress Type A / SD|
|Connectivity||HDMI A (Full Size), USB Type-C (USB 3.2 Gen 1), USB Micro-B (USB 2.0), 3.5mm Microphone, 3.5mm Headphone|
|Operating Temperature||32 to 104°F / 0 to 40°C|
|Battery||1 x NP-FZ100 Rechargeable Lithium-Ion, 7.2 VDC, 2280 mAh (Approx. 600 Shots)|
|Dimensions (W x H x D)||5.07 x 3.81 x 2.74" / 128.9 x 96.9 x 69.7 mm|
|Weight||1.35 lb / 614 g (Body Only)|
What's In The Box
- Sony Alpha a7S III Mirrorless Digital Camera (Body Only)
- USB Type-C to Type-A Cable
- Cable Protector
- Shoulder Strap
- Accessory Shoe Cap
- Eyepiece Cup
- Limited 1-Year Warranty