September 25, 2023


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Sea&Sea Sony Alpha Common Housing Suitable with a7R Mark V

5 min read

Sea&Sea has now added the Sony a7R Mark V to the record of cameras suitable with its common housing, unveiled in July 2022. The MDX-αU already supported the “entry-level” a7 Mark IV, “video-centric” a7S Mark III, “professional sports activities” a9 Mark II, “8K-capable” a1, and the high-resolution predecessor, the a7R Mark IV. On account of the “common” design, preliminary mounting of the digital camera is a bit more concerned, there are some useful limitations that require workarounds, and an non-obligatory further equipment is required.

The common housing options a big acrylic again panel, which reduces weight and goals to offer higher visibility of the LCD. There’s a fiber-optic cable cowl, which is designed to guard the connectors and stop them from falling out. A leak alarm unit is included as commonplace tools. The housing is offered in a silver end in addition to the tradtional black.

The MDX-αU helps fiber-optic connectivity with suitable Sea&Sea YS strobes in TTL or guide modes by way of the non-obligatory Optical YS Converter S2 or Guide Flash Set off, respectively. In the event you set off your YS strobes by way of sync cords, you even have the choice of {an electrical} connection.

Accessible from retailers comparable to Backscatter, the MDX-αU is priced at $4,400.


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Sea&Sea MDX-αU Underwater Housing for Sony α1/α9II/α7sIII/α7RIV/α7IV/α7RV

Common compatibility with Sony Alpha sequence. The longer term-oriented mirrorless SLR suitable housing is now absolutely loaded


Common design for the longer term. The again panel is designed to be massive

The again acrylic panel is greater than twice as massive as earlier than to enhance visibility of the monitor and scale back the underwater weight. Moreover, it’s a sustainable design that can be utilized with new cameras sooner or later with minimal components alternative.

Newly designed fiber-optic cable cowl Newly designed optical fiber cable cowl

Newly designed fiber-optic cable cowl included. Prevents optical cable terminals from falling out and neatly protects light-emitting panels and cable terminals. Features a strap to forestall lack of the quilt.


Leak Alarm Unit as commonplace tools

The Leak Alarm Unit, which was beforehand out there as an possibility, is now included as commonplace tools. It’s efficient not just for early detection of underwater flooding accidents, but additionally for cover of apparatus by checking its waterproof efficiency earlier than entry. CR2032 lithium battery included.

Product No.44135 Leak Alarm Unit Product Web page.

Strobe Synchro System

Three non-obligatory strobe connection strategies can be found.

1. Optical TTL connection

[Product No.50151]  Optical YS Converter S2

Suitable with SEA&SEA “Optical YS Converter S2” which converts the strobe gentle emission sign of the digital camera to LED gentle and synchronizes with the SEA&SEA YS strobe. It’s a high-performance converter that doesn’t simply emit easy light-emitting alerts, but additionally performs TTL auto gentle management.


*Sony authentic adapter “ADP-MAA” is required individually for connecting digital camera and optical YS converter.


Optical TTL connection


2. Optical guide connection

[Product No.50146]  Guide flash set off

For many who don’t want TTL pictures, the fiber-optic cable connection allows guide firing of the YS strobe.

Optical guide connection


3. Electrical connection

[Product No.50147]  Strobe connector/N

[Product No.50122]  Non-obligatory Sync Twine 2-pin Connector

YS strobes may be electrically related with a sync twine.

Electrical connection


Full vary of normal tools

  • Grip Plus manufactured from silicone materials
  • Strong but safe match to carry the housing in place
  • Lighting may be deployed as desired from the SA8 fastened ball base
  • Pre-equipped with lanyard hooks for handy transportation

Focus Level Motion Settings

To carry out “focus level operation” throughout capturing, please make a customized setting for the main target level within the dial customization of the digital camera prematurely. The main focus level may be moved by working the entrance/rear dial.

The next is a information to the setup process for assigning the main target level operation to the entrance and rear dials.



Enhancement Customization Equipment

Widespread to all fashions

  • Up/down/left/proper buttons on the multi selector can’t be used
  • Use the up/down/left/proper buttons on the management wheel as a substitute
  • The up/down/left/proper buttons on the management wheel can’t be used to maneuver the main target level
  • Focus level may be moved with the entrance and rear dials utilizing the digital camera’s dial customization operate

α1/α9II digital camera

  • Drive mode/focus mode dials will not be out there as commonplace
  • It may be supported by utilizing the non-obligatory equipment
  • If you wish to change the drive mode and so on. with out modification, you’ll be able to quickly use it by registering the digital camera’s customized capturing setting prematurely and calling up the operate, however it’s not an ideal substitute

α7IV digital camera

  • The capturing mode lever can’t be used
  • This may be dealt with by utilizing an non-obligatory equipment
  • S&Q can’t be used

α7V digital camera

  • The capturing mode lever can’t be used
  • This may be dealt with by utilizing an non-obligatory equipment
  • S&Q can’t be used

[Product No.50148] α1 customise equipment for MDX-αU

Suitable with drive mode dial/focus mode switching lever.

[Product No.50149] α9II Customise Equipment for MDX-αU

Suitable with drive mode dial and focus mode choice lever.

[Product No.50150] α7IV Customise Equipment for MDX-αU

Suitable with capturing mode choice lever.

[Product No.50152] α7RV Customise Equipment for MDX-α7RVU

Suitable with capturing mode choice lever.

*The α7RV customise equipment can’t be used with an electrically related strobe sync system.

Different Options

  • The Port Lock prevents the port from turning or loosening and the Port Lock lever is particularly situated to keep away from being unlocked unintentionally

  • The housing is supplied with a lens-lock launch button which makes it attainable to alter lenses simply, with out opening the housing

  • Pulling out the Focus/Zoom Dial offers enough space contained in the housing to simply accommodate bigger diameter lenses

  • Geared up with the Optical Viewfinder 0.5x as commonplace. Different non-obligatory viewfinders such because the VF180 1.2x, VF45 1.2x and Optical Viewfinder 0.66x, 0.8x can be utilized

    ※Some vignetting happens.When the VF180 1.2x is mounted on housing, the uper a part of the digital camera’s viewfinder can’t be seen resulting from vignetting

  • Geared up with two sacrificial zinc diodes (one on the entrance case and the opposite on the rear) to forestall electrolysis injury

  • Tripod screw mount is situated on the centre underside of the housing


[Construction] Physique: corrosion-resistant aluminum alloy (machined)
  Grip: corrosion-resistant die-cast aluminum alloy
[Depth rating] 100m / 330ft
[Dimensions (WxHxD)] 330 x 169 x 137 mm / 12.9 x 6.6 x  5.4 inches
[Weight] Approx. 2,900g / 102.3oz (Housing solely)
[Set Item] Silicone grease, O-ring remover, Hex wrench (6mm / for grip dismounting), Hex wrench (4mm / for Lanyard bolt), Hex wrench (2mm), O-ring upkeep guide, Instruction guide (this guide), CR2032 lithium battery (for leak alarm unit), Leak alarm unit guide pump
[Attached accessories to the product] Housing physique cap, Fiber-optic cable cowl


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