Best Overall
DJI Osmo Action 4
Key details
- Sensor
- 1/1.3-inch CMOS
- Weight
- 5.11 oz
- Max Video
- 4K at 120fps
- Battery Life
- Up to 160 minutes
The number that settled this one for us is 1/1.3 inches: it is the largest sensor listed on any camera in this guide, and it is paired with 2.4μm pixels. Underwater light falls away fast with depth, and a sensor that size holds color and keeps grain down where the small compacts start to smear. That is the difference you notice when you are reviewing the day's clips that evening rather than on the boat.
The magnetic quick-release is the detail we did not expect to care about. It clips to a mask strap, comes off in one pull, and shoots vertical without a cage, so handing it to someone else on the boat takes a second rather than a conversation. Between the 155-degree view and the stabilization, the footage looks smoother than the swim felt.
There is no housing in the box — the body itself is the waterproof part, which removes the one maintenance job the cased action cameras have. The 1770mAh battery is rated for well over two hours, and the camera keeps working down to -20°C. Our one practical note: pair it with your phone at home, on your own Wi-Fi, before you travel.
What it is not is a stills camera for reef life. This is built for wide, immersive footage, and if your trip is about a seahorse at arm's length, the TG-7 does that better. For surf, pool, boat rides, and the one camera you want in a dry bag, this is where we start.
Pros
- Largest sensor in this group for low light
- Magnetic mount swaps between hand and mask
- No housing to seal or maintain
- Battery rated over two hours, cold-rated to -20°C
Cons
- No optical zoom, so close-up stills are not its job
The camera we reach for on any trip with water in it: the biggest sensor here keeps snorkeling footage clean when light thins, and the mount makes it easy to live with.