Sony Alpha A7S III + Sony XLR-K3M Adapter Kit (SKU BUN-A7SIIIXLRK3M)

The Sony Alpha A7S III is a full-frame mirrorless camera designed for filmmakers and content creators who need high sensitivity, wide dynamic range, and professional video features in a compact body. It continues the strengths of the S series, adding a powerful new processing engine, advanced autofocus, in-body image stabilisation, and 4K recording up to 120p.

New Full-Frame Sensor with Faster Readout

The camera uses a newly developed 12.1MP back-illuminated full-frame Exmor R CMOS sensor with up to twice the readout speed of the A7S II. This sensor delivers:

• High sensitivity with low noise

• Wide dynamic range

• An improved colour filter array for more accurate colour reproduction

• On-sensor phase-detection autofocus for more stable and precise AF

These improvements work together to produce clean, detailed images and video.

BIONZ XR Image-Processing Engine

The BIONZ XR processor offers up to 8 times the processing power of the previous generation. It:

• Reduces latency and improves responsiveness

• Handles real-time AF, subject recognition, and image processing

• Manages data transfer, user interface, and overall camera operation

This results in smoother performance for both stills and video.

High Sensitivity and Wide Dynamic Range

The 12.1MP full-frame design is optimised for low-light performance and clean output across the entire ISO range. Key points:

• Standard ISO range: 80–102400 (expandable to 40–409600)

• For movies: 80–409600 range available

• Dynamic range up to 15 stops

You can shoot in very dark conditions while maintaining usable detail and natural-looking highlights and shadows.

Full-Frame 4K Recording at Up to 120p

Thanks to high-speed sensor readout and the BIONZ XR processor, the A7S III can record:

• Full-frame 4K at up to 120 fps with autofocus

• Full-pixel readout with no pixel binning, maintaining high detail and clarity

This enables smooth slow-motion (up to 5x slower than real time in post), shallow depth of field, and professional-looking bokeh, all in a compact camera body.

10-Bit 4:2:2 Internal Recording

The camera can record 4K internally with:

• 10-bit colour depth

• 4:2:2 colour sampling

• Long GOP or All-Intra compression

This provides more flexibility in colour grading, better HDR performance, smoother gradients, and more robust files for professional editing.

All-Intra Internal Recording

In addition to Long GOP, the A7S III supports All-Intra (All-I) recording, where each frame is encoded independently at bitrates up to 600 Mb/s. This:

• Improves editing responsiveness

• Simplifies frame-accurate cuts

• Provides maximum flexibility in post-production

Efficient HEVC (H.265) Codec and XAVC HS

The XAVC HS format, using the HEVC/H.265 codec, offers:

• Roughly double the compression efficiency compared to standard 4K XAVC S

• Smaller file sizes at comparable quality

• Support for detailed 10-bit 4:2:2 recording with manageable data rates

16-Bit RAW Output via HDMI

For advanced workflows, the camera offers:

• 16-bit RAW output over HDMI to a compatible external recorder

• Full-frame 4264 × 2408 (16:9) output

• Frame rates including 23.98p, 25p, 29.97p, 50p, and 59.94p

• Choice of colour spaces in post-production

This maximises dynamic range and grading flexibility.

S-Log2, S-Log3 and Matching with Cinema Cameras

The A7S III supports:

• S-Log2 and S-Log3 gamma curves

• Up to 15 stops of dynamic range with S-Log3

• Three colour gamuts: S-Gamut, S-Gamut3, S-Gamut3.Cine

S-Gamut3 and S-Gamut3.Cine are designed for easier matching with Sony’s professional cinema cameras, simplifying multi-camera workflows and colour grading.

Proxy Recording for Faster Editing

When recording high-bitrate formats (for example XAVC S-I 4K), the camera can simultaneously record low-bitrate HD proxy files. These can be used for:

• Faster editing and previews on less powerful systems

• More efficient workflows

Proxy options include:

• 10-bit XAVC HS (1920 × 1080)

• 8-bit XAVC S (1280 × 720)

10-Bit HLG Picture Profile for HDR

The A7S III includes an HLG (Hybrid Log-Gamma) picture profile with BT.2020 colour space for direct HDR playback on compatible TVs. Benefits:

• Natural-looking HDR footage without mandatory colour grading

• Retained detail in shadows and highlights

• Extra smooth gradation with 10-bit recording

Improved Image Quality and Reduced Rolling Shutter

The upgraded sensor and processor deliver:

• More natural and consistent skin tones

• Improved foliage and texture reproduction

• Refined highlight roll-off, especially in portraits

• Significantly reduced rolling shutter distortion (down to roughly one-third of the A7S II when recording 4K)

Fast Hybrid AF for Video

Borrowing technology from Sony’s FX9, the A7S III uses Fast Hybrid AF combining:

• On-sensor phase-detection AF

• Contrast-detection AF

This results in:

• Smooth, precise tracking of fast-moving subjects

• Reliable AF performance even with shallow depth of field

• Excellent performance with Sony E-mount lenses, including linear focus motors and power zooms

Two customisable AF controls are provided:

• AF Transition Speed (how quickly focus shifts between subjects)

• AF Subject Shift Sensitivity (how readily AF switches to a new subject)

Both can be assigned and recalled with custom buttons during recording.

AF Support in Manual Focus

Autofocus can assist even when you mainly shoot with manual focus:

• Full-speed AF by half-pressing the shutter or pressing the AF-ON button

• Slower, more cinematic AF transitions triggered via touch focus on the screen or Real-time Eye AF assigned to a custom button

• Smooth AF moves at the pre-set AF Transition Speed

Real-Time Tracking and Real-Time Eye AF for Video

Advanced tracking features simplify movie shooting:

• Real-time Tracking uses colour, pattern, depth, and face data to keep the subject in focus

• Real-time Eye AF locks onto eyes for more reliable portraits and talking-head videos

• Touch Tracking lets you start tracking by touching the subject on the LCD

These features are particularly useful when shooting solo or using a gimbal. AF can also be temporarily engaged via touch even when operating in manual focus.

Active Mode Image Stabilisation for Video

The camera’s Optical SteadyShot system includes Active Mode:

• Uses a precision stabilisation unit, gyro sensors, and optimised algorithms

• Provides strong stabilisation for handheld 4K video

• Lets you shoot confidently without a gimbal in many situations

Enhanced Audio Options

The Multi Interface Shoe includes a digital audio interface:

• Supports clean digital audio directly into the camera with compatible accessories

• With the XLR-K3M adapter, up to 4-channel 24-bit audio recording is possible

Selectable formats:

• 48 kHz / 16-bit 2-channel

• 48 kHz / 24-bit 2-channel

• 48 kHz / 24-bit 4-channel (requires XLR-K3M)

Heat Management for Long Recordings

Sony has redesigned the camera’s internal heat dissipation:

• A unique sigma-shaped graphite-alloy heatsink is built into the stabilisation unit

• Heat is dissipated up to five times more efficiently than in previous models

• The sensor can still move freely for stabilisation, and the system helps prevent overheating during long takes

Designed for Smooth Movie-Making

Ergonomics and controls are tailored to video work:

• Side-opening vari-angle 3.0-inch LCD with 1.44 million dots

• Movie button placed on the top panel for easier access

• Full-size HDMI Type-A port for secure, reliable external connections

• Mode dial layout and default settings optimised for professional use

Dedicated Movie Settings and Flexible Exposure Mode

Certain settings can be stored separately for stills and movies:

• Independent ISO, aperture, and other values for photo and video modes

• When in Movie or S&Q mode, Flexible Exposure Mode replaces standard PASM

• Quickly toggle between auto and manual control of aperture and shutter speed

• Auto/manual toggles can be assigned to custom buttons for one-touch switching

Fast Hybrid AF for Stills

For photography, the A7S III uses:

• 759 phase-detection points covering around 93% of the image area

• 425 contrast-detection points

Features include:

• Real-time Eye AF for humans and animals

• Real-time Tracking for dynamic subjects

• AF performance down to EV –6, enabling accurate focus even in very low light

High-Speed Continuous Shooting

Both mechanical and electronic shutters support:

• Up to 10 fps continuous shooting with AF/AE tracking

• Over 1000 uncompressed RAW images in a single burst, thanks to increased buffer capacity and faster card writing

Improved Stills Image Quality

Stills benefit from:

• Exceptional sensitivity and low noise, especially in mid-to-high ISO ranges

• Better colour and texture reproduction

• A new visible light and IR sensor for more accurate auto white balance

• Support for HEIF stills and HLG Still Image mode (8-bit and 10-bit HEIF)

Creative Look for Instant Style

The Creative Look feature provides:

• Ten in-camera presets that adjust contrast, colour, and brightness

• Eight adjustable parameters for fine-tuning each look

• The ability to save and recall custom Creative Looks for future use

Dual CFexpress Type A / SD Card Slots

The A7S III has two media slots that support:

• CFexpress Type A cards

• SDXC / SDHC cards (UHS-I and UHS-II)

CFexpress Type A cards offer:

• Very fast write/read speeds

• Reliable recording of high-bitrate 4K video

• Rapid buffer clearing after continuous bursts

9.44-Million-Dot High-Resolution EVF

The electronic viewfinder features:

• 9.44-million-dot resolution

• Approximately 0.90x magnification

• 41° diagonal field of view

• 25 mm high eyepoint for comfortable viewing

Improved sealing reduces internal condensation even with rapid temperature changes.

New Touch-Driven Menu System

The menu system is redesigned for professional workflows:

• Tabs displayed on the left, with related parameter groups and settings on the right

• Up to three levels shown at once for a clearer overview

• Full touch operation for faster, more intuitive navigation

Robust, Weather-Resistant Construction

The A7S III is built for demanding conditions:

• Full magnesium-alloy body for durability

• Enhanced sealing at all joints, buttons, and doors

• Redesigned media-slot cover and better battery-compartment sealing

• Ultrasonic sensor-cleaning system vibrating at 70,000 cycles per second to help remove dust from the sensor

USB Power Delivery and Extended Shooting

The camera supports USB Power Delivery (USB PD):

• PD-compatible USB chargers and power banks can be connected to the USB-C port

• Enables long shooting sessions without relying solely on the internal battery

• Can recharge the internal battery faster than conventional USB power

Advanced Connectivity and Workflow Support

The A7S III supports:

• Wired and wireless FTP transfer for stills and movies

• Wireless LAN at 2.4 GHz and 5 GHz

• Wired 1000BASE-T Ethernet via a USB-to-Ethernet adapter connected to the USB-C port (SuperSpeed USB 5 Gbps / USB 3.2)

Remote shooting:

• From a computer with Sony Imaging Edge Desktop

• From a mobile device with Imaging Edge Mobile

External Flash Control from the Camera

You can control compatible flashes and wireless radio commanders directly from the camera menu:

• Change key settings such as light output from the camera body

• Flash parameters are displayed in the same language as the camera menus

Imaging Edge Desktop Software

Imaging Edge Desktop provides:

• Remote: for live view and remote control from a computer

• Viewer: for quick preview, rating, and selection of large image sets

• Edit: for high-quality RAW development and output

This suite helps you get the most from Sony RAW files and manage complex shoots efficiently.

Capture One for Sony

Capture One Express for Sony is a free RAW processing and editing software that offers:

• Robust RAW development

• Efficient file management

• Strong editing tools

Capture One Pro for Sony adds advanced editing and tethered shooting capabilities for more demanding workflows.

S-Cinetone Colour Science

S-Cinetone, derived from Sony’s cinema cameras such as the FX9 and VENICE, is included:

• Produces cinematic colour straight out of camera

• Emphasises natural skin tones and pleasing mid-range colours

• Offers gentle highlight roll-off

• Reduces or eliminates the need for grading in some workflows

Compatible with iMovie and Final Cut Pro X

The camera works with iMovie and Final Cut Pro X for users editing on Apple platforms.

Security and Software Updates

When the product contains software that requires updates, Sony may provide security and functional updates to maintain performance and safety.

Sony XLR-K3M Adapter Kit – Overview

The Sony XLR-K3M is a two-channel digital XLR audio adapter that connects professional microphones and audio sources to compatible Sony cameras via the Multi Interface Shoe.

Key points:

• Designed to work best with cameras that have a digital audio interface in the MI Shoe, sending a direct digital audio stream to the camera

• Compatible with other Sony cameras using the standard MI Shoe via switchable digital/analog output

Included is the ECM-XM1 shotgun microphone, suitable for interviews, streaming, and general video production.

Digital Sound with Low Noise

When used with a camera that supports digital audio in the MI Shoe:

• Audio is transferred in digital form with minimal risk of degradation

• A switch allows selection between digital and analog output for broader compatibility

Inputs and Controls

The XLR-K3M provides:

• Two XLR/TRS combo inputs with switchable mic/line levels and 48V phantom power

• One 3.5mm stereo input with plug-in power

• Individual level controls and intuitive interface

Available controls include:

• Recording level (Auto/Manual)

• Link function to tie Input 1 and Input 2 levels

• Attenuator

• Low-cut filter at 100 Hz or 300 Hz

Mechanical Noise and Cable-Free Operation

The adapter features:

• Shock and vibration suppression to reduce handling and low-frequency noise

• Cable-free operation when mounted directly on the MI Shoe, avoiding mechanical noise through cables

Flexible Mounting

• An MI Shoe extension cable is included, allowing the XLR-K3M to be offset or repositioned to suit cages and rigs

ECM-XM1 Shotgun Microphone

The kit includes:

• ECM-XM1 supercardioid mono shotgun microphone

• Fur windscreen for reducing wind noise

This combination is ideal for on-camera directional recording in a variety of environments.

Package Includes

Sony Alpha A7S III Mirrorless Camera

• Sony Alpha A7S III Mirrorless Digital Camera (Body Only)

• Sony NP-FZ100 Rechargeable Lithium-Ion Battery (2280 mAh)

• Sony BC-QZ1 Battery Charger

• Sony ALC-B1EM Body Cap for E-Mount Cameras

• USB Type-C to Type-A Cable

• Cable Protector

• Shoulder Strap

• Accessory Shoe Cap

• Eyepiece Cup

Sony XLR-K3M Adapter Kit

• Sony XLR-K3M Adapter

• ECM-XM1 Shotgun Microphone

• Fur Windscreen

• MI Shoe Cable

Specifications – Sony Alpha A7S III Mirrorless Camera

Imaging

• Lens Mount: Sony E

• Camera Format: Full-frame (1x crop factor)

• Pixel Count:

  • Actual: 12.9 megapixels

  • Effective: 12.1 megapixels

• Maximum Resolution: 4240 × 2832

• Aspect Ratios: 1:1, 3:2, 4:3, 16:9

• Sensor Type: CMOS

• Sensor Size: 35.6 × 23.8 mm

• Image File Formats: JPEG, RAW, HEIF

• Bit Depth: 14-bit

• Image Stabilisation: 5-axis sensor-shift

Exposure Control

• ISO Sensitivity:

  • Auto: 80–102400 (expandable to 40–409600)

• Shutter Speed Range: 1/8000 to 30 seconds, plus Bulb mode

• Metering Methods: Center-weighted, Highlight-weighted, Multi, Spot

• Exposure Modes: Program, Aperture Priority, Shutter Priority, Manual

• Exposure Compensation: –5 to +5 EV in 1/3 EV steps

• Metering Range: –3 to 20 EV

• White Balance Options: Auto, Cloudy, Daylight, Shade, Flash, Incandescent, Underwater, Custom, Colour Temperature, Colour Temperature Filter, Fluorescent (Cool White, Day White, Daylight, Warm White)

Continuous Shooting and Timers

• Continuous Shooting:

  • Up to 10 fps at 12.1 MP for up to 1000 RAW or 1000 JPEG frames

  • Up to 8 fps at 12.1 MP

  • Up to 6 fps at 12.1 MP

  • Up to 3 fps at 12.1 MP

• Interval Recording: Yes

• Self-Timer: 2, 5, or 10 seconds

Video Recording

Internal recording options include:

• H.265 / XAVC HS 4:2:2 10-bit

  • 4K (3840 × 2160) at 23.976 / 25 / 29.97 / 50 / 59.94 / 100 / 119.88 fps (50–280 Mb/s)

• H.265 / XAVC HS 4:2:0 10-bit

  • 4K at 23.976 / 25 / 29.97 / 50 / 59.94 / 100 / 119.88 fps (30–200 Mb/s)

• H.264 / XAVC S-I 4:2:2 10-bit

  • 4K at 23.976 / 25 / 29.97 / 50 / 59.94 fps (240–600 Mb/s)

  • Full HD (1920 × 1080) at 23.976 / 25 / 29.97 / 50 / 59.94 fps (89–222 Mb/s)

• H.264 / XAVC S 4:2:2 10-bit

  • 4K at 23.976 / 25 / 29.97 / 50 / 59.94 / 100 / 119.88 fps (100–280 Mb/s)

  • Full HD at 23.976 / 25 / 29.97 / 50 / 59.94 / 100 / 119.88 fps (50 Mb/s)

• H.264 / XAVC S 4:2:0 8-bit

  • 4K at 23.976 / 25 / 29.97 / 50 / 59.94 / 100 / 119.88 fps (60–200 Mb/s)

  • Full HD at 23.976 / 25 / 29.97 / 50 / 59.94 / 100 / 119.88 fps (16–100 Mb/s)

External recording via HDMI includes:

• 16-bit RAW at 4.2K (4264 × 2408) up to 59.94p

• 4:2:2 10-bit:

  • 4K up to 59.94 fps

  • Full HD at 23.976 / 50 / 59.94 fps

  • Full HD 1080i at 50 / 59.94 fps

• 4:2:0 8-bit:

  • Similar frame-rate support in 4K and Full HD as above

Additional video details:

• Recording Limit: Unlimited

• System: NTSC/PAL switchable

• Audio Recording: Built-in stereo mic, external mic input

• Audio Formats: AAC LC, AC3, Dolby Digital 2-channel, Linear PCM stereo

• Live Streaming: Supported

• Webcam Functionality: Supported

Focus System

• Focus Types: Autofocus and manual focus

• Focus Modes: AF-S, AF-C, DMF, Manual Focus

• Autofocus Points:

  • 759 phase-detection points

  • 425 contrast-detection points

• AF Sensitivity Range: –6 to +20 EV

Viewfinder and Monitor

• Viewfinder:

  • Type: Electronic OLED

  • Size: 0.64 inch

  • Resolution: 9,437,184 dots

  • Eye Point: 25 mm

  • Coverage: 100%

  • Magnification: Approx. 0.9x

  • Diopter Adjustment: –4 to +3

• Rear Monitor:

  • Size: 3 inches

  • Resolution: 1,440,000 dots

  • Type: Articulating touchscreen LCD

Flash

• Built-In Flash: No

• Flash Modes: Auto, Fill, Slow Sync, Rear Sync, Red-Eye Reduction, Hi-Speed Sync, Off

• Maximum Sync Speed: 1/250 second

• Flash Compensation: –3 to +3 EV (in 1/3 or 1/2 EV steps)

• Dedicated Flash System: TTL

• External Flash Connection: Hot shoe

Interface and Connectivity

• Memory Card Slots: Dual slots supporting CFexpress Type A and SD (SDHC/SDXC)

• Connections:

  • HDMI Type A (full size)

  • USB Type-C (USB 3.2 Gen 1)

  • USB Micro-B (USB 2.0)

  • 3.5 mm microphone input

  • 3.5 mm headphone output

• Wireless: Wi-Fi and Bluetooth

• GPS: Not built-in (can be provided via smartphone connection)

Environmental

• Operating Temperature: 32 to 104°F (0 to 40°C)

Physical

• Battery: 1 × NP-FZ100, 7.2 V, 2280 mAh (approx. 600 shots)

• Dimensions (W × H × D): 128.9 × 96.9 × 69.7 mm

• Weight: 614 g (body only)

Specifications – Sony XLR-K3M Adapter Kit

Compatibility

• Digital Audio: Sony cameras with a digital Multi Interface Shoe

• Analog Audio: Sony cameras with a standard or digital Multi Interface Shoe

Inputs

• 2 × XLR/TRS combo inputs with:

  • Switchable mic/line level

  • 48V phantom power

• 1 × 3.5 mm stereo input with plug-in power

Output

• Multi Interface Shoe connection to the camera

Controls

• Input level controls

• Link function for inputs

• Auto/Manual gain selection

Filters

• Low-cut filter: selectable at 100 Hz or 300 Hz

Weight

• Approximately 187 g (6.6 oz)

Packaging Info (Adapter Kit)

• Approximate Package Weight: 1.695 lb

• Approximate Box Dimensions (L × W × H): 9.9 × 8.7 × 4 inches