DJI Osmo Action 4 Review: A Discount Camera, Not a Discount Workflow

The Osmo Action 4 is still a useful camera for daylight rides, hiking clips and water-based travel. What it no longer deserves is an automatic recommendation at anything close to its original price. Its video capabilities remain substantial, but the Action 5 Pro and Action 6 improve convenience, storage and low-light flexibility in ways buyers will notice.

TechRadar's launch coverage dates it to August 2023 and records a $399 Standard Combo price. This review is a research synthesis of DJI documentation and Tim Coleman's independent testing. Verdict Hound has not handled or tested the camera. We use the original testing as evidence of behavior, while judging the older hardware against the choices available at our November 8, 2026 review date.

Buyers should start with two questions: how far below an Action 5 Pro does the complete kit cost, and does your shooting actually benefit from the newer model? If the savings are small, a camera that requires a card for every recording and has a shorter published support horizon is less attractive.

DJI specifies a 1/1.3-inch CMOS sensor behind an f/2.8, 155° lens. Normal 16:9 capture reaches 4K120, while 4:3 4K tops out at 60fps. These are different mode limits; a tall capture frame and maximum slow-motion rate cannot simply be combined because both appear on the feature list.

Coleman found a meaningful low-light improvement over the Action 3, with cleaner detail and less objectionable noise. That is useful evidence for forest rides and overcast travel, not evidence that the Action 4 matches a much larger camera after dark. Moving subjects in very little light still challenge shutter speed and stabilization.

The 10-bit D-Log M option is particularly helpful if you already edit footage from another DJI camera. It gives you grading room and a more consistent starting point than trying to undo a heavily styled default look. Manual white balance also helps avoid obvious color changes within a clip. Neither feature guarantees a match without exposure and color work.

The camera's 10MP photographs are adequate for casual sharing, but high-resolution stills are not its main strength. If you want one body for large travel prints and long video sessions, look at the broader camera category rather than pretending an adventure camera replaces a dedicated photographic body.

DJI's specified minimum focus distance is 0.4m. Coleman identified this as an issue for close-range filming. The important consequence is simple: a short grip held very near your face, or a product pushed close to the lens, may not look as sharp as the background.

Keep your arm or grip long enough and review a sample before recording a whole day of commentary. The front touchscreen helps you frame, but the small display is not a reliable substitute for inspecting focus on a larger screen. There is no autofocus system that will rescue a subject placed inside the fixed lens's focusing range.

The related Pocket 3 offers a better dry-land talking-camera experience with autofocus and mechanical stabilization. It is also a fragile, non-weatherproof gimbal, so it should not be mounted or exposed as though it were an Action 4. The distinction is about the environment, not which product has the nicer picture in a room.

TechRadar's running footage showed convincing smoothing, and Coleman described the camera as a useful tool for action. RockSteady 3.0 and 3.0+ use an electronic crop to compensate for movement. More aggressive stabilization should be chosen when the correction is worth the lost width.

Full HorizonSteady is limited to 1080p or 2.7K at 60fps or below. HorizonBalancing extends to supported 4K combinations, also no higher than 60fps. Dedicated Slow Motion does not support EIS. Ordinary high-frame-rate capture and the separate Slow Motion mode are therefore not interchangeable.

For helmet footage, leave room around the subject so stabilization and final cropping do not push important details out of frame. For handlebars, pay attention to vibration and mount rigidity. Software that smooths jogging does not necessarily solve every rapid vibration from a poorly attached bracket.

Electronic stabilization can become less convincing when low light forces blurred exposures. That is why we judge the Action 4's improvement over its predecessor favorably without promising the same result in a dark forest as on a sunny trail.

The removable battery is 1770mAh. DJI's 160-minute reference uses 25°C, 1080p24, RockSteady on, Wi-Fi off and displays off. This is a defined baseline, not a continuous 4K120 runtime.

Coleman used two batteries on some shooting days. He reported no problematic overheating in the field and noticed warming in desk use, but the review does not give a controlled 4K recording duration paired with all settings and ambient temperature. We therefore do not assign an invented one-hour or two-hour thermal benchmark to this model.

For a stationary recording, simulate the planned setup before relying on it. Higher frame rates, limited airflow and warm surroundings can create a different load from short outdoor clips. A power connection is not automatically a cure for heat, and opening a port changes the camera's water-use conditions.

A spare battery and reliable card are a more sensible budget than spending every dollar on the body. If a discounted Action 4 kit needs both additions before it can do your job, compare that total against an Action 5 Pro bundle.

The 145g body has front and rear touch controls and DJI's magnetic quick-release mounting arrangement. For a creator moving between a handle, chest position and small tripod, that can be more convenient than repeatedly tightening a screw. Make sure the retaining hardware has engaged; magnetic attraction alone is not the complete safety mechanism.

DJI rates the camera to 18m without a case and 60m with the appropriate case. These figures are manufacturer specifications under sealing conditions, not our pressure-test results. Close the battery and USB-C doors and follow the current manual before immersion.

The two-meter difference from newer DJI bare-camera ratings is not necessarily the most important buying distinction. For ordinary shallow-water use, mount choice, door condition and correct handling are more relevant than choosing by the largest printed number.

There is no internal storage. A missing, full or incompatible microSD card ends the recording plan. DJI specifies support for cards up to 512GB, but capacity alone does not prove a card's suitability for high-bitrate video. Use a compatible recommended card and test it before travel.

The integrated microphones are a straightforward way to capture ambient sound. DJI's wireless microphone ecosystem and a receiver-based setup can improve speech recording, but check the particular transmitter and firmware combination instead of assuming all later Action-series pairing features apply. A waterproof camera with an exposed audio adapter is a different rig from the sealed bare body.

One current specification deserves attention: DJI lists guaranteed software updates until December 31, 2026. This does not mean the camera stops working the next day, or that no later update can ever appear. It means a new buyer in late 2026 should not treat long-term mobile compatibility and feature support as an open-ended commitment. That is a legitimate cost-of-ownership consideration for a discounted older device.

The launch references were $399 / £379 / AU$629, with the US Adventure Combo at $499. These are historical prices from 2023, not current offers. We would not choose this model at its original premium positioning simply because a retailer labels it an action-camera bargain.

The Action 5 Pro adds internal storage, OLED screens and much stronger independently specified endurance evidence. The Action 6 offers square capture and a variable aperture, helpful for reframing and dim light. The HERO12 Black offers taller 8:7 reframing, GP-Log and strong stabilization, but GoPro's low-light limitations still matter.

An existing Action 4 owner can reasonably keep it if the resulting footage is good and the workflow remains compatible. A new buyer should require a meaningful saving after accessories, not a token reduction from an old MSRP.