Most models have a single lens, with an ultra-wide angle of view, so you can experiment with mounting and get a big view of the world in frame. Some dual-lens cameras, like the recently announced GoPro Max, capture a 360-degree view of the world. VR playback isn't as popular as it was at the peak of the fad, but editing tools make it possible to convert 360-degree footage into a 16:9 playback format in creative ways.
The FT30 isn't the newest waterproof digital camera here, and doesn't quite offer any best-in-class specs, but what it does offer is commensurate with its very reasonable asking price. It’s also pleasingly slim enough to fit in a snug jeans pocket or similar, although this does come at the cost of a secure grip; you might want to invest in a wrist strap to ensure the FT30 doesn’t get away from you. Provided you keep hold of it, the FT30 is a solid and versatile waterproof camera that should prove well-suited to recording your aquatic adventures – in stills form, anyway. The lower video resolution of 720p means that if you’re a video aficionado, you’re probably better off with one of the other waterproof digital cameras on this list. 
Then there's resolution and video quality. You'll want a camera that can record in 4K for sure. The top-end models from DJI and GoPro offer 60fps 4K with digital stabilization that's absolutely incredible. They're also not limited to ultra-wide views; you can set a narrower angle to remove lens distortion, making them solid choices for vlogging and travel logs.

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