Sony a7S III Mirrorless Camera Body Only

  • 12.1 MP full-frame back-illuminated Exmor R CMOS sensor for excellent low-light performance

  • BIONZ XR image processor offering high-speed readout and reduced rolling shutter

  • Internal 4K video up to 120 fps with 10-bit 4:2:2 sampling

  • 16-bit RAW output over HDMI for external recording

  • 5-axis in-body image stabilization with Active mode for smoother handheld video

  • Advanced autofocus (759 phase-detect + 425 contrast) with Real-time Eye AF and tracking

  • Dual card slots supporting CFexpress Type A and UHS-II SD cards

  • Fully articulated, side-opening touchscreen LCD and high-resolution EVF (9.44M-dot)

  • Durable, weather-sealed magnesium alloy body

Description

Product Overview

 

Specification Detail
Model / Type Sony Alpha a7S III (ILCE-7SM3) — mirrorless interchangeable-lens camera
Sensor 12.1 MP (effective), full-frame (35.6 × 23.8 mm) back-illuminated Exmor R CMOS
Max Image Resolution 4240 × 2832 px
Processor BIONZ XR
ISO Range Native: 80 – 102,400 ; Expanded: 40 / 409,600
Stabilization 5-axis in-body sensor shift, up to approx. 5.5 stops; Active mode for video
Shutter / Shooting Modes Mechanical / electronic shutter ; 1/8000 s to 30 s (plus BULB)
Continuous Shooting Up to 10 fps with full AF/AE, buffer over 1,000 RAW frames
Autofocus System 759 phase-detection + 425 contrast-detect, Real-time Eye AF, touch tracking
Viewfinder 0.64-type OLED EVF, approx. 9.44 million dots, 0.9× magnification, 41° FOV
Rear LCD 3.0″ vari-angle (side-opening), approx. 1.44 million dots, touchscreen
Video Recording 4K UHD up to 120p (10-bit 4:2:2) ; Full HD up to 240p ; Multiple codecs (XAVC-S, XAVC HS, XAVC S-I)
RAW / External Output 16-bit RAW output via HDMI Type A ; 10-bit internal
Media Slots Dual slots: CFexpress Type A + SDXC / SDHC (UHS-II)
Connectivity / Ports USB-C (USB 3.2 Gen 1), Micro-USB, Full-size HDMI A, 3.5 mm mic & headphone jacks, Multi Interface Shoe (digital audio)
Wireless Wi-Fi (2.4 / 5 GHz), Bluetooth
Battery NP-FZ100 Li-ion ; approx. 510 shots (via EVF) / 600 shots (via LCD)
Body / Build Magnesium alloy frame, weather/dust-sealed
Dimensions 129 × 97 × 81 mm
Weight (body only) Approx. 699 g

Sony A7S III Overview

 

12.1MP Exmor RS BSI CMOS Sensor with BIONZ XR Processor

 

The Sony A7S III is built around a newly redesigned 12.1MP full-frame back-illuminated Exmor RS CMOS sensor that delivers stunning image clarity and reduced noise, even in low light. Its expanded ISO range of 40–409,600 makes it a powerhouse for night shoots and challenging lighting conditions.

Working alongside the advanced BIONZ XR image processor, the sensor achieves up to 8x faster performance and significantly cuts rolling shutter distortion by 3x. With 2x faster readout speeds, it captures both stills and video with remarkable accuracy. This combination offers up to 14 stops of dynamic range for photos and 15 stops for video, plus continuous shooting at 10 fps for 1000+ uncompressed RAW images.

Sony a7S III Mirrorless Camera Body Only
Sony a7S III Mirrorless Camera Body Only

UHD 4K 120p Video with 10-Bit 4:2:2 Internal Recording

Designed for filmmakers, the A7S III records 4K video up to 120 fps with full-pixel readout and no binning. It supports internal 10-bit 4:2:2 recording in all modes and even outputs 16-bit RAW via HDMI Type-A for maximum post-production flexibility.

Choose between advanced codecs like XAVC HS (HEVC/H.265) for efficient compression or XAVC S-I intraframe for consistent high-quality performance at bitrates up to 600 Mb/s.


Creative Recording Flexibility

Shoot smooth 4x or 5x slow-motion footage directly in-camera at 4K, or push it further with Full HD 240 fps recording. Unlike many cameras, the A7S III has no recording time limits, and its new heat-dissipating design supports extended recording sessions—up to 60 minutes at 4K60p without overheating.

Advanced Color Science

With S-Cinetone, the A7S III delivers cinematic color straight out of the camera, matching Sony’s FX6, FX9, and VENICE cinema cameras. Expect natural skin tones, soft highlights, and rich mid-tones that are ideal for film and commercial work.

For maximum post-production control, it also supports S-Log2 and S-Log3 profiles, squeezing up to 1300% more dynamic range than standard Rec.709.


Fast Hybrid Autofocus with Real-Time Tracking

The 759 phase-detection and 425 contrast-detection points cover 92% of the frame, ensuring reliable autofocus across any scene. Its Real-time Eye AF works for both humans and animals, locking focus precisely where it matters.

For video shooters, the AF system includes customizable transition speeds and subject shift sensitivity, allowing smooth and cinematic focus pulls.

Sony a7S III Mirrorless Camera Body Only
Sony a7S III Mirrorless Camera Body Only

5-Axis In-Body Image Stabilization

 

The enhanced 5.5-stop 5-axis SteadyShot INSIDE system stabilizes handheld footage, whether you’re shooting wide-angle landscapes, telephoto close-ups, or macro shots. For video, the Active IS mode adds an extra layer of stabilization for ultra-smooth footage, even without a gimbal.


Professional Viewfinder & Vari-Angle LCD

 

Framing your shot is effortless with the 9.44m-dot OLED Tru-Finder EVF, offering 0.9x magnification, a wide 41° field of view, and smooth 120 fps refresh rates.

The first A7-series camera with a side-opening 3.0″ vari-angle touchscreen LCD, it makes vlogging, low/high angle shooting, and self-recording intuitive and flexible. The redesigned menu system is now more streamlined and touch-friendly, catering to both stills and video workflows.

Rugged Body & Dual Card Slots

Built with a magnesium alloy chassis, the A7S III is lightweight yet durable, with enhanced weather-sealing against dust and moisture. Its dual card slots support CFexpress Type A and UHS-II SD cards, ensuring fast data handling and flexible storage options.

The camera runs on Sony’s NP-FZ100 battery, delivering up to 600 shots (LCD) or 95 minutes of video recording per charge, making it perfect for long shoots.


Professional Connectivity Options

The A7S III offers all the ports professionals demand:

  • Full-size HDMI Type-A for external RAW recording

  • USB 3.2 Gen 1 Type-C + Micro-USB for fast tethering and charging

  • 3.5mm headphone & microphone jacks for audio control

  • Multi Interface Shoe for digital audio accessories like the ECM-B1M mic or XLR adapter kits

  • Wi-Fi (2.4/5GHz) for remote control, wireless tethering, and instant file sharing

  • Optional Ethernet adapter support for 1000BASE-T wired FTP transfers and live production workflows

Sony a7S III Mirrorless Camera Body Only

Why Choose the Sony A7S III?

The Sony A7S III is more than a mirrorless camera—it’s a cinematic powerhouse designed for creators who demand exceptional low-light performance, high frame-rate 4K recording, industry-leading autofocus, and pro-level connectivity. Whether you’re a filmmaker, content creator, or photographer, this camera unlocks new creative possibilities.

In the Box:

Sony a7S III Mirrorless Camera
Sony NP-FZ100 Rechargeable Lithium-Ion Battery (2280mAh)
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

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