Sea and Sea MDX-D850 Underwater Housing for Nikon D850

The BEST housing for Nikon D850

The Sea&Sea MDX series is widely regarded as one of the finest underwater camera housing systems available for professional and enthusiast underwater photographers. Engineered with precision, durability, and ease of use in mind, Sea&Sea MDX housing models are designed to protect your camera while delivering complete access to essential controls beneath the surface.

Its superior ergonomic design and standout range of optional accessories help you capture those optimal moments with the best image quality.

Much lighter than previous housings.
Using modern precision machining, the dimensions of the housing are similar to those of the camera. In addition, the revised internal design has also helped reduce weight. The MDX-D850 is approximately 11% (350g/12.3oz) lighter than the previous MDX-D810 housing.

Various controls can be operated whilst holding the grips.
Frequently used Main and Sub-Command dials are now located directly on the right side of the housing. ISO, REC and other camera functions can be operated by external levers whilst holding the grips. With the AF lock function, you can fix the focus point as required.

Optical YS Converter/N1 can be built into the housing
Optical YS Converter/N1 can be built into the housing
Compatible with Optical YS Converter/N1 for MDX housing which converts the camera’s hot-shoe TTL signal to a light signal. Both TTL and manual strobe modes can be used and controlled from the housing using a Fiber-Optic Cable II.
* Fiber-Optic Cable ll is required when using the Optical YS Converter.
*Serial numbers 124000274 and above are compatible with the Nikon D850. Serial numbers below 124000274 are not compatible. New firmware and/or conversion of the converter will be required.

All the dials have a spring (damper) to prevent the slip of the controls, even if the dimensions of the cameras are slightly different or if gears or other parts wear out to some extent.

MDX-D850 Underwater Housing Review

• 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.
• 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 housing.
• Pulling out the Focus/Zoom Dial gives sufficient room inside the housing to comfortably accommodate larger diameter lenses.
• All controls have luminescent 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 0.8x, can be used.
• *When the VF180 1.2x is mounted on the MDX-D850 housing, the lower part of the camera’s viewfinder (where the shooting data is displayed) cannot be viewed due to vignetting. 
• Sync Cord 2-pin Connector enables the use of a conventional hardwired Sync cable (Manual mode only).
• The accessory port allows the use of Leak Sentinel (vacuum sensor).
• 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.

Sea&Sea Mdx

The Sea and Sea MDX is a premium underwater housing specifically designed to protect digital cameras while allowing photographers to access virtually every camera function underwater. Manufactured from corrosion-resistant aluminum alloy and precision-engineered for professional use, MDX housings are trusted by underwater photographers around the world.

Unlike generic waterproof cases, each Sea&Sea MDX housing is custom-designed for specific camera models, ensuring a secure fit and precise control placement.

The MDX series is suitable for:

• Professional underwater photographers
• Marine researchers
• Dive instructors
• Wildlife filmmakers
• Advanced recreational divers
• Underwater content creators

Its reputation for reliability has made it a preferred choice for demanding underwater environments.

Maintenance Tips

Proper care helps extend the lifespan of your Sea&Sea underwater housing.

Best practices include:

• Rinse thoroughly in fresh water after every dive.
• Inspect and clean O-rings before each use.
• Lubricate O-rings using the recommended grease.
• Store with the housing open in a cool, dry location.
• Avoid prolonged exposure to direct sunlight.
• Test the housing before important dive trips.

Regular maintenance ensures dependable waterproof performance.

Is the Sea and Sea MDX D850 Worth the Price?

Although the Sea and Sea MDX D850 underwater housing price places it in the premium category, it offers exceptional value for serious underwater photographers. The housing is engineered to withstand demanding marine environments while providing smooth operation, reliable sealing, and compatibility with a wide range of underwater photography accessories.

Why Choose the Sea&Sea MDX-D850?

Designed specifically for the Nikon D850, the MDX-D850 offers complete access to camera controls while maintaining exceptional waterproof protection at depths of up to 100 meters (328 feet). Its ergonomic dual-handle design allows photographers to comfortably operate essential controls, even while wearing dive gloves.

Frequently Asked Questions

Is the Sea&Sea MDX suitable for beginners?

Yes. While designed for professional-quality photography, enthusiastic beginners can also benefit from its durability and intuitive controls.

Can I use different lenses with the MDX housing?

Yes. The modular port system allows photographers to use a wide range of compatible lenses with the appropriate ports and extension rings.

Is the Sea&Sea MDX compatible with mirrorless cameras?

Absolutely. Sea&Sea manufactures dedicated mirrorless underwater housing models for many popular mirrorless camera systems.

How deep can the Sea&Sea MDX be used?

Depth ratings vary by housing model. Always refer to the manufacturer’s specifications for your specific MDX housing.

Is the MDX worth the investment?

For serious underwater photographers, the MDX’s premium construction, ergonomic controls, and reliable protection make it a worthwhile long-term investment.

The Sea&Sea MDX has earned its reputation as one of the industry’s leading underwater camera housing systems. Combining precision engineering, durable aluminum construction, ergonomic controls, and dependable waterproof performance, it enables photographers to capture exceptional underwater images with confidence.