SeaTouch 4 MAX PLUS

The housing that started this. Your phone goes inside, you touch the screen through the membrane, and everything the phone does it keeps doing at depth: the native camera, a third-party app, the exposure slider, all of it.

Rated to 60 m (200 ft), but read the second number carefully: the touchscreen itself is specified to 30 m (98 ft). Below that the water pressure stops the membrane working reliably, so plan on setting up the shot before you go deeper. For Red Sea reef diving that limit sits below where the color is anyway.

At 375 g (13.2 oz) on land and roughly 150 g (5.3 oz) in the water it is noticeably lighter in the hand than the 6 Pro, and it takes the same phone sizes, up to 180 x 82.5 x 11.2 mm. Two phone adapters are in the box, so a smaller phone does not rattle around.

Buy this one if you want the lighter housing and the lower price. Buy the 6 Pro if you want the newer membrane and the filter already included.