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for Sony A7SIII Camera

SKU # 17428

$ 4,042.00

The long awaited Sony a7S III brings high frame-rate 4K video with incredible low-light sensitivity to the A7 full frame mirrorless lineup. The video-centric follow up to the a7S II adds internal 10-bit 4:2:2 4K capture at up to 120fps while building on the a7S II's already segment leading low-light capabilities. Upgrades also extend to the 9.44M dot OLED viewfinder, 759-point phase detection autofocus and reduced rolling shutter.

Technical Specifications

 Dimensions 339mm(W) x 170mm(H) x 125mm(D)
Weight in air 2.7kg
Weight in water -0.56kg (incl. camera and battery)
Depth Rating 100m
Compatible Cameras Sony a7S III


Introducing NA-A7SIII

The Sony Alpha a7S III Camera

Built around a new 12.1MP Exmor RS BSI CMOS sensor coupled with a BIONZ XR image processor, the a7S III is a powerful video oriented mirrorless full-frame camera. The long awaited follow up to the a7 SII, which set the standard for low-light capabilities in the full-frame mirrorless segment, brings not only improvements to that key spec but also a host of other notable upgrades.

Key Camera Specs

  • 12.1MP Exmor RS BSI CMOS sensor
  • ISO sensitivity of 40-409600
  • 4K Video Capture at up to 120fps
  • Internal recording at up to 10-bit 4:2:2 color sampling
  • No recording time limit
  • 16-bit raw video output over HDMI-A
  • 759-Point phase-detection autofocus with 92% coverage
  • Dual UHS-II card slots
  • S-Log2/3 or HLG/BT.2020 gamma curves
  • 5.5 Stop IBIS

The new sensor features 759 phase-detection and 425 contrast-detection autofocus points that cover approximately 92% of the image area and promises sensitivity down to -6 EV. Customizable seven-step AF transition speed and five-step AF subject shift sensitivity allows for fine tuning of the autofocus system. As expected, ISO sensitivity is expanded to ISO 40-409600.

A 5-axis in-body stabilization system provides 5.5 stops of camera movement, even with adapted lenses, which combined with the 120fps frame-rates help deliver ultra-smooth handheld video.

Video can be recorded in either All-I XAVC S-I at up to 600Mbps or XAVC HS which uses H.265 compression for smaller file sizes. Internal 4K recording uses 1:1 pixel readout at up to 120fps with 10-bit 4:2:2 sampling. The a7S III offers extensive color customization including the S-Log2 and S-Log3 gamma curves that can deliver 15+ stops of dynamic range. HLG and BT.2020 color spaces are also available. Recording time limits have been removed and improved heat dissipation has been added to the camera body's design. Internal recording is to UHS-II rated dual card slots that support CFexpress Type A or SD cards. External recording of 16-bit raw video is possible via the full size HDMI port when used with compatible recorders.

Nauticam NA-A7SIII Underwater Housing

Nauticam is the leader in producing intuitively designed precision manufactured aluminum underwater housings for the Sony a7 camera line and continues to innovate with the new NA-A7SIII housing. 

The NA-A7SIII is designed to maximize the video-centric capabilities of the Sony a7S III camera while maintaining it's strong still image potential.  The NA-A7SIII is built around the N100 port system that is shared with the rest of the Nauticam housing lineup for the Sony full-frame mirrorless a7 series.  The N100 system includes a dull range of both macro and wide-angle ports as well as delivering access to the lineup of Nauticam's professional wet optics that are optimized for underwater imaging such as the WACP-1/2 and the SMC-1/2 lenses.  These optics deliver unparalleled image quality underwater expanding what is possible with the powerful a7S III camera.

HDMI Output

The a7S III can output 16-bit raw video signal over HDMI and the NA-A7SIII features an M24 bulkhead that supports the HDMI 2.0 standard.  This allows the NA-A7SIII to be used in conjunction with either a recording monitor such as the Atomos Ninja V in the NA-NinjaV housing  via HDMI 2.0 or standalone monitors such as the SmallHD 502 Bright in the NA-502B housings via HDMI 1.4.  

Optional Magnifying Viewfinder

The a7S III camera features an updated 9.44M-dot OLED viewfinder with a 120fps refresh rate.  Nauticam's line of optional magnifying viewfinders, available in both an angled 45º (32203) or straight 180º (32201) configuration provide enhanced viewing ability as well as a dioptric adjustment knob that can used underwater.  Installation can be achieved without tools in less than a minute.  

Mission Control

Nauticam engineer's Mission Control design philosophy means controls are intuitively placed where they are needed most regardless of their position on the camera.  The NA-A7SIII features a double thumb lever within easy reach of the right handle that triggers the AF-ON and RECORD controls of the camera.  A thumb lever on the left side toggles the PLAYBACK button.  The back panel of the housing provides access to all other rear camera controls including a multidirectional pad.

Vacuum Check and Leak Detection System

The Nauticam vacuum check and leak detection system is shipped with NA-A7SIII as standard equipment. With the addition of the optional M14 Vacuum Valve (25624) this monitoring system provides constant updates on the water tight and safe-to-dive status of the housing. A simple color coded LED lighting system lets the user know that the vacuum is solid, or that the housing is losing vacuum. Leak detection is built into the same circuit, so if there is water intrusion, an audible and visual indication will occur. The Nauticam system is temperature compensated, eliminating false alarms caused by a change in outside temperature, or from a camera heating up on an action packed dive.



What's In The Box

  • NA-A7SIII Housing
  • 90120 Spare main O-ring, O-ring remover and lubricant
  • 2x Handles with mounting balls
  • Panasonic CR-2032 Battery (for moisture alarm and vacuum dector)
  • Set of Allen Keys
  • Manual instruction card
  • Padded housing bag and shoulder strap

PDF User Manual Download

Recommended Accessories

  • 32211 Nauticam Full Frame Straight Viewfinder 32°/ 1:1
  • 32212 Nauticam Full Frame Straight Viewfinder 40°/ 0.8:1
  • 32213 Nauticam Full Frame Angle Viewinder 32°/ 1:1
  • 32214 Nauticam Full Frame Angle Viewinder 40°/ 0.8:1
  • 32201 Nauticam 180˚ straight viewfinder
  • 32203 Nauticam 45˚ viewfinder
  • 25624 M14 Vacuum Valve II (Pushbutton Release)
  • 25218 Mounting Ball Set for Tripod Legs
  • 32201  Nauticam 180˚ straight viewfinder
  • 32203  Nauticam 45˚ viewfinder
  • 26302 Mini Flash Trigger for Sony
  • 28130  Hand Strap for 28113
  • 26216  Universal Optical Fiber Cable
  • 25081  M24-M16 Step Down Adaptor (required to use Nikonos 5-pin Bulkhead)
  • 25056 M14 Nikonos 5-pin Bulkhead with Universal Hotshoe Connection (X and Ground Connection Only)
  • 37305 N100 to N120 35.5mm Port Adaptor II (NA-A7SIII is not compatible with 37303 or 37301 N100 to N120 Port Adaptor)


Required accessories for HDMI 2.0 Cable System

  • 25086 M24 adaptor for HDMI 2.0 cable (incl. tightening tool)
  • 25094 M24A3R210-M28A1R170 HDMI 2.0 Cable (for NA-A7SIII to use with Ninja V housing)

*Support RAW 16bit 4.2K (4264 x 2408) up to 59.94p output

Monitor housing:

  • 17922 Nauticam Atomos Ninja V Housing for Atomos Ninja V 5” 4Kp60 4:2:2 10-bit Reorder/Monitor/Player (excl. HDMI 2.0 cable)

Required accessories for HDMI 1.4 Cable System

  • 25081 M24-M16 Step Down Adaptor
  • 25095 HDMI (D-A) cable in 170mm length (for connection from HDMI bulkhead to camera)
  • 25033 standard HDMI bulkhead with M16 thread

*25033 is included in NA-058/502H/ 502B-H monitor housing

Monitor Options:

  • 17906 NA-502H housing for Small HD 502 5-inch HD monitor
  • 17920 NA-502B-H Housing for SmallHD 502 Bright Monitor



Unveiled on the very first Nauticam DSLR housing in 2009, this locking lever has become a signature of the Nauticam brand.  No twisting or threading action is required to mount a port, and it locks securely in place with this lever.  Nauticam also offers locking port extensions, meaning a dome will never twist, even when used with a long extension ring.


The industry's easiest to use housing closure system, requiring very little hand strength to operate, secures the housing back in place. The latches are safely locked to prevent accidental opening, but are easy to open when needed for a quick battery or memory card change.

HDMI Output

The NA-A7SIII supports the HDMI 2.0 standard allowing connection to optional external monitors and recorders to take advantage of the a7S III raw video HDMI output.

Mission Control

Controls on the NA-A7SIII are intuitively placed to provide quick and responsive access to essential camera controls resulting in fewer missed shots and a smoother operating experience.



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