Home » Mirrorless & DSLR » Underwater housing Mirrorless & DSLR » Underwater housing Sea&Sea Sony a1, a7R V, a7 IV, a7S III, a7R IV, a9 II (6 Sony cameras)

Underwater housing Sea&Sea Sony a1, a7R V, a7 IV, a7S III, a7R IV, a9 II (6 Sony cameras)

MDX-AU Sony Alpha model:
Sea&Sea universally compatible with Sony Alpha series the MDX-aU underwater housing. The housing all have bulkheads for strobes & external monitors, depth rated to 100 meters and optical viewfinder.
36 450 SEK
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36 450 SEK
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Part no: MDX-AU


Universally compatible with Sony Alpha series the MDX-aU underwater housing is now fully loaded.

Choose which Sony camera model you have when placing your order.

The housing

This housing is equipped with an optical manual strobe trigger (#50146). For those who do not need TTL photography but want rappid fire, the fiber optical cable connection enables manual fire of an optical controlled strobe.

The back acrylic panel is more than twice as large as before to improve the visibility of the monitor and reduce the underwater weight. Furthermore, it is a sustainable design that can be used with new cameras in the future with minimal parts replacement. Newly designed fiber-optic cable cover are included. Prevents the optical cables from falling out and smartly protects light-emitting panels with a strap to prevent loss of the cover.

The Leak Alarm Unit, which was previously available as an option, is now included as standard equipment. It is effective not only for the early detection of underwater flooding accidents but also for the protection of equipment by checking its waterproof performance before entering the water. CR2032 lithium battery included.

Strobe sync options

Option 1. Optical TTL converter (#50151). Compatible with SEA&SEA “Optical YS Converter S1” which converts the strobe light emission signal of the camera to LED light and synchronizes with Sea&Sea YS strobes. It is a high-performance converter that does not just emit simple light-emitting signals, but also performs TTL auto light control.
Option 2. Electrical connection. Strobe connector/N (#50147) & Sync Cord 2-pin bulkhead contact (#50122). Let's you connect YS strobes electrically with an optional sync cord.

Full range of standard equipment & features

Grip Plus is made of silicone material.
Robust yet secure fit to hold the housing in place.
Lighting can be deployed as desired from the SA8 fixed ball base.
Pre-equipped with lanyard hooks for convenient transportation.
Functional Limitations and Enhancement Customization Kit
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.
All controls have luminescence stickers that glow in a dark environment.
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.


Body corrosion-resistant aluminum alloy (machined)
Grip corrosion-resistant die-cast aluminum alloy
Depth rating 100m
Dimensions 330 x 169 x 137 mm
Weight Approx. 2,900g housing only

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