Unfortunately, the housing sports a mere three buttons: power, shutter release, and LCD power/Playback. While this arrangement makes for straightforward use, it also forces you to rely solely on the flash, white-balance, and exposure settings you chose before you put the camera in the housing. Since underwater conditions are a mystery until you splash down, you must guess at how to set up the camera in advance.

If you're wrong, you have to get out of the water, dry off the housing, and start over. ReefMaster RM-4K PRO 2000 set: £589 camera itself has a compact 7.3-ounce design and is easy to use.

Removable Li-ion rechargeable battery allows up to 2+ hours video or 500+ images.

Focus from 30 cm to infinity (optional lenses available).Expandable memory using micro SDHC/SDXC memory card up to 128GB.Inbuilt Wi-Fi to preview, download and share footage to smart devices.Easy 4-button controls for easy operation.

Underwater colour-correction modes – ‘Underwater Deep’ and ‘Underwater Shallow’.

40 m compact underwater housing with removable inner camera.

2.0″ 230K Hi-res TFT colour LCD view screen.

4K Ultra HD Video 30fps and 1080p HD video 60 fps.

14 megapixel Panasonic CMOS image sensor.

The camera is compatible with SeaLife accessories such as the Sea Dragon light systems and is available as a set that includes a Sea Dragon 2000 lumen COB LED Light. Memory is expandable up to 128GB using micro SDHC memory cards.

The ReefMaster has a WiFi sharing capability so images and videos can be previewed, downloaded and shared via a smart-phone or tablet using the free ‘SeaLifeReefMaster’ app available from Google Play or the Apple App Store. The housing is rated to a maximum depth of 40m. The ReefMaser features a 2.0″ TFT colour LCD viewing screen and all functions are accessible through a simple 4-button control system. The standard package includes a compact removable inner camera with a ‘robust’ external housing that can be used as a hand-held device or tray-mounted for use with a lighting rig. Revillagigedo Archipelago & Guadalupe Island.

Reefmaster