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DJI Osmo Action 4, 1/1.3 inch sensor, 4K 120 fps, 155 degrees review

The only action camera here to publish a sensor size, and the only one with a magnetic mount and a stated cold rating — while never printing the waterproof depth that eight of its nine rivals lead with.

The bottom line The most capable camera on this shelf on the things that are hard to fake — sensor area, frame rate, colour depth, cold — and the page omits the one figure this whole family is normally sold on. For grading and for winter it is the pick; for diving, the depth has to be found elsewhere.

On the listing

A 1/1.3 inch sensor credited with better low-light quality; 10-bit and D-Log M colour for stable grading in post-production; cold resistance to -20 °C with long battery life claimed; 4K at 120 fps with a 155 degree ultra-wide field of view; a magnetic quick release for changing position and shooting true vertical video; 360 degree HorizonSteady among three stabilisation modes; a box holding the camera, one battery and a quick-release adapter mount; and direct pairing with a DJI Mic 2 or Mic Mini transmitter for audio.

The figure nobody else on this shelf prints

One inch over one point three. Eight other cameras here publish resolutions — 5K, 4K, 30 MP, 20 MP — and not one publishes the sensor producing them. This listing does, and that single number explains the price gap better than any other line on the page: area collects light, and light is what a small camera runs out of first.

Built for what happens after the shoot

Ten-bit colour and a D-Log M profile are not features for someone posting straight from the camera. They exist so footage can be graded, and together with the -20 °C rating they describe a working camera rather than a holiday one.

The omission is startling

No waterproof depth. Not a metre, not an IP code, across eight bullets. Every other camera on this shelf except the body camera leads with 30 or 40 metres. Whatever the reason, a buyer reading this page cannot learn whether the camera may be taken into water, and this page will not invent it.

One battery

The box holds a single cell. Four cameras here at a quarter of the price supply two. On a camera whose third bullet claims long battery life without a number, that is the practical thing to plan for.

Availability

Between 189 € and 238 € on the German, French, Italian and Spanish Amazon stores when this page was last checked.

The American and British Amazon stores carry it too, priced in local currency. Those amounts are deliberately absent from the range above, which reads euro stores only.

Everything in this section is the figure Keepa carried on the day of the last update to this page. Availability and prices shift without notice.

Prices quoted in this text were read on 13 September 2026. The live price is at the top of the page.

What it does well, and what it gives up

Strengths

  • Publishes a sensor size, 1/1.3 inch, which no other camera on this shelf does and which is what actually decides low-light quality
  • 4K at 120 fps, more than three times the frame rate of most cameras here
  • States a cold rating, -20 °C, and 10-bit D-Log M colour for grading — both figures aimed at people who will edit the footage

Compromises

  • No waterproof depth anywhere on the page, alone with the body camera among these nine
  • One battery in the box, where four cameras at a quarter of the price supply two
  • The 155 degree field of view is narrower than the 170 degrees claimed by several cheaper cameras

Specifications

Waterproof claimNot published on the listing — eight bullets cover the sensor, colour, cold resistance, the field of view, the magnetic mount, stabilisation, the box and audio, and no depth or ingress rating appears. Every other camera on this shelf leads with one
Video resolutions4K, stated in the title and the fourth bullet
Frame rates120 fps at 4K, stated in the title as 4K/120fps and repeated in the fourth bullet — the highest combination on this shelf by a wide margin
Stabilisation modesThree modes, with 360 degree HorizonSteady named in the sixth bullet as holding the frame level through a full rotation. It is the only listing here to count its modes rather than print the letters EIS
Field of view155 degrees, stated in the fourth bullet as ultra wide. Narrower than the 170 degrees several cheaper cameras claim
Mount interfaceA magnetic quick release, stated in the fifth bullet as making position changes and true vertical video easy. The box includes one quick-release adapter mount
Battery lifeNot published in figures — the third bullet claims long battery life alongside cold resistance to -20 °C, and no capacity or runtime is given. One battery is supplied
Battery removabilityRemovable — the seventh bullet lists one battery among the box contents, and only one, where four cheaper cameras here supply two
Amazon referenceB0C783YNW7 (same reference on 6 Amazon marketplaces)
EAN6941565965073

What people ask before they commit

Why does a sensor size matter more than resolution?

Area decides how much light each pixel collects, and light is what separates a usable frame at dusk from a noisy one. A 1/1.3 inch sensor is substantially larger than what a 5K camera at a third of the price is likely to carry — though none of them publishes a size, so the comparison can only be made against this listing’s own figure. That is the finding: one camera of nine states it.

Is this camera waterproof?

The listing does not say, and this page will not fill the gap. Eight bullets cover sensor, colour, cold, field of view, mounting, stabilisation, contents and audio without a depth or an ingress rating, while every other camera here leads with 30 or 40 metres. Anyone buying it for water should check the maker’s own documentation before getting it wet.