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Sea&Sea Announces Housing for Sony a7R Mark IV
By Ian Bongso-Seldrup, November 27, 2019 @ 09:00 AM (EST)

Sea&Sea has announced its new housing for the Sony a7R Mark IV. The MDXL-α7IV belongs to the company’s new MDXL-series housings, which boast various features as standard, including silicone handle inserts for improved grip, SA8 Fixed Ball Bases, and the Leak Sentinel XB pre-dive vacuum leak detection system alongside the company’s built-in leak sensor. Sea&Sea’s signature yellow now also surrounds certain controls to make them more visible.

The machined aluminum housing offers manual strobe triggering via sync cords and can optionally be fitted with a hotshoe-mounted Optical YS Converter to allow fiber-optic connectivity with compatible Sea&Sea strobes in both TTL and manual modes.

Pricing and availability are not available at this time, but you can preorder the housing on Backscatter.

When purchasing underwater photography equipment like the products mentioned in this article, please support DPG by supporting our retail partner—Backscatter.com.


Sea&Sea MDXL-α7IV Underwater Housing for Sony α7RIV
Revised ergonomic design, improved safety features and eye-catching exterior. The new MDX-L series housings are now upgraded with more standard features to ensure better handling and greater protection for your camera


Equipped with Grip plus, SA8 Fixed Ball Bases, Leak Sentinel XB

  • Equipped with new silicone handle inserts for firm and steady grip as standard. Silicone compound material implanted in the grip providing firm hold.
  • SA8 Fixed Ball Bases now comes standard with MDX-L series housings
  • Leak Sentinel XB, which measures atmospheric pressure inside the housing even on land, is now a standard accessory together with the conventional built-in Leak Sensor. Two alert sensors are available for your peace of mind.



For better noticeability, controls is partially colored with yellow

Compatible with the Sea&Sea, “Manual Flash Trigger/S” (optional)

The camera can be mounted in the housing with its LCD monitor extended from the camera to reduce the distance between the rear window and monitor to increase visibility

Compatible with Optical YS Converter S1

  • Compatible with SEA&SEA “Optical YS Converter S1” which converts the strobe light emission signal of the camera to LED light and synchronizes with the SEA&SEA YS strobe. It is a high-performance converter that does not just emit simple light-emitting signals, but also performs TTL auto light control.

    *Sony original adapter “ADP-MAA” is required separately for connecting camera and optical YS converter.

Buoyancy Pocket

  • With Buoyancy Pocket*1, underwater weight has lessened by 240g/8.5oz*2. The pocket can be used as space for extra battery pack*3.

    *1 Dimensions: 100x63x24mm/3.9x2.5x0.9 inches.
    *2 Compared with the MDX-5D Mark lV, 240g/8.5oz lighter under the following condition: MDX-α7lV + SEL90M28 + Focus Gear + DX Macro Port 87 (underwater weight: 700g/24.7oz).
    *3 SEA&SEA will not take any responsibility for accident caused by use of extra battery or any other accessory stored in the Buoyancy pocket.

Compatible with all the DX (NX) series ports.

  • The camera can be removed from the housing easily even if a lens with large diameter such as the SEL1635GM is mounted on the camera without removing port from the housing enabling you to replace battery and lens with ease.


  • The Port Lock prevents the port from turning or loosening and the Port Lock lever is specifically located to avoid being unlocked accidentally.
  • The housing is equipped with a lens-lock release button which makes it possible to change lenses easily, without opening the housing.
  • Pulling out the Focus/Zoom Dial gives sufficient room inside the housing to easily accommodate larger diameter lenses.
  • The camera’s diopter adjustment dial can be operated from outside the housing. This feature is useful when two or more people with different eyesight use the housing.
  • Equipped with the Optical Viewfinder 0.5x as standard. Other optional viewfinders such as the VF180 1.2x, VF45 1.2x and Optical Viewfinder 0.66x, 0.8x can be used.
    *Some vignetting occurs. When the VF180 1.2x is mounted on housing, the uper part of the camera's viewfinder cannot be viewed due to vignetting.
  • Sync Cord 2-pin Connector enables use of conventional hardwired Sync cable (Manual mode only).
  • Equipped with two sacrificial zinc diodes (one on the front case and the other on the rear) to prevent electrolysis damage.
  • Built-in leak sensor immediately alerts you to water ingress.
  • Tripod screw mount is located on the centre underside of the housing.




  • [Construction]
Body: corrosion-resistant aluminum alloy (machined)
  Grip: corrosion-resistant die-cast aluminum alloy
  • [Depth rating]
100m / 330ft
  • [Dimensions (WxHxD)]
330 x 189 x 131 mm / 13.0 x 7.4 x  5.2 inches
  • [Weight]
Approx. 2,800g / 98.8oz (Housing only)

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