Best Overall
DJI Osmo Action 4
Key details
- Sensor
- 1/1.3-inch CMOS
- Stabilization
- RockSteady, RockSteady+, HorizonBalancing
- Max Slow Motion
- 4K/120fps
- Rated Battery Life
- 160 minutes
The number that matters here is 120. This is the cheapest camera in this group that clearly delivers 4K at 120 frames per second, and it does it without asking you to baby the hardware: it is waterproof, it weighs 145 grams, and the magnetic mount moves from a tripod to a chest rig in a couple of seconds. We reach for it first because slow motion is usually a spur-of-the-moment decision — the wave, the dog, the kid on the swing — and this is the one that is already mounted when the moment arrives.
The 1/1.3-inch sensor matters more for slow motion than it does for ordinary video. At 120fps each frame is exposed for a sliver of time, so the camera is permanently hungry for light; the 2.4μm pixels and the fast readout are what keep dusk footage usable instead of noisy. Add 10-bit color and D-Log M and those clips have room to be graded rather than just compressed.
RockSteady and HorizonBalancing hold handheld 120fps steady, and the high-frame-rate mode keeps a 155° field of view, so the wide look survives. Long takes are the one place it gets cranky: the body warms up, and a hot afternoon in direct sun is the worst case. Short bursts, which is what most slow-motion clips actually are, keep it out of trouble.
Budget for the edit as well as the shoot. The 4K/120 files are H.265, and older laptops struggle to play them back smoothly, so a fast V60 card and a recent machine are part of the real cost of using this mode. Get that right and the workflow disappears; get it wrong and you spend the evening transcoding.
Pros
- Records 4K at 120fps, not just 1080p
- 1/1.3-inch sensor keeps 120fps usable at dusk
- Waterproof and 145 g, so it goes anywhere
- 10-bit color and D-Log M for grading
Cons
- Companion app is clunky and missing from the Android store
- Battery drains fast when shooting 4K/120
Our top pick because it delivers 4K at 120fps without a caveat — waterproof, 145 grams, and the least expensive way here to shoot slow motion anywhere.