Camera
Osmo Action 4
What the Osmo Action 4 Is and Where It Sits
The DJI Osmo Action 4, released on August 2, 2023, is DJI's flagship body-mounted action camera for 2023, competing directly in the high-end wearable-camera segment. Within the broader DJI lineup, it sits alongside the Osmo Pocket 3 (a stabilized handheld gimbal camera), the Mini 4 Pro, and the Mavic 3 Pro drones, each designed for a different capture scenario. The Osmo Action 4 is the choice for physically demanding, mount-based, waterproof shoots where compactness and ruggedness matter more than interchangeable lenses.
A Notably Large Sensor for the Action Camera Category
The headline specification is the 1/1.3-inch CMOS sensor, which sits among the largest in the action camera class as of its 2023 release. A larger sensor captures more light per photosite, translating directly to cleaner shadow detail and reduced color noise at higher ISO settings. The camera's ISO range runs from 100 to 12800 in both photo and video modes, and consensus indicates the extra sensor area keeps noise well-managed into the mid-ISO range where competitors with smaller sensors begin to struggle.
Lens, Aperture, and Field of View
The fixed lens opens to f/2.8 and covers a 155-degree field of view, a wide-angle perspective suited to immersive POV footage, helmet mounts, and environments where backing up is not possible. The f/2.8 aperture is relatively fast for an action camera and supports the sensor in lower light. Because the lens is fixed, optical zoom is not available; DJI provides in-camera digital zoom instead.
4K at Up to 120fps: What That Means in Practice
The Osmo Action 4 records at up to 4K (3840x2160) at 100 or 120 frames per second, per its official product page. Shooting at 4K/120fps means footage can be slowed to approximately 20 percent speed in a 24fps editing timeline while retaining full 4K pixel resolution, a substantial creative tool for action sports, wildlife, and fast-moving subjects. For more extreme slow motion, the camera offers 1080p at 240fps, corresponding to 8x slow motion as listed in specifications.
10-Bit D-Log M: Color Grading Latitude Explained
The color profile specification of 10-bit D-Log M is meaningful for post-production workflows, as 10-bit capture stores 1024 tonal levels per channel compared to 256 in 8-bit. DJI's D-Log M is a flat, low-contrast profile, and reviewers note it is more approachable than some log formats, with DJI-supplied LUTs that convert it to standard Rec.709 in a single step. Users who do not intend to grade footage can shoot in standard color profiles instead.
Stabilization: RockSteady 3.0, RockSteady 3.0+, and HorizonSteady
The Osmo Action 4 ships with three electronic stabilization modes: RockSteady 3.0 for standard shake correction, RockSteady 3.0+ for stronger correction with a minor frame crop, and HorizonSteady for locking the horizon level through rotations of up to 360 degrees. HorizonSteady is particularly useful for skiing, surfing, or cycling footage where the camera rolls significantly, at the cost of a reduced field of view compared to RockSteady. Consensus indicates these modes are among the most effective electronic image stabilization implementations in the action camera category.
| Spec | A | B |
|---|---|---|
| Sensor | 1/1.3-inch CMOS | — |
| Effective Megapixels | 10 MP | — |
| ISO Range | 100–12800 (photo and video) | — |
| Aperture | f/2.8 | — |
| Field of View | 155° | — |
| Max Video Resolution | 4K (3840×2160) @ 100/120 fps | — |
| Slow Motion | 1080p @ 240 fps (8× slow motion) | — |
| Color Profile | 10-bit D-Log M | — |
| Stabilization | RockSteady 3.0 / RockSteady 3.0+ / HorizonSteady | — |
| Electronic Shutter | 1/8000–30 s | — |
| Front Screen | 1.4-inch, 320×320, 323 ppi | — |
| Rear Screen | 2.25-inch, 360×640, 326 ppi | — |
| Battery Capacity | 1770 mAh (6.8 Wh) | — |
| Battery Life | ~160 min at 1080p/24fps | — |
| Wi-Fi | 802.11 a/b/g/n/ac | — |
| Bluetooth | BLE 5.0 | — |
| Waterproofing | 18 m without case; 60 m with Waterproof Case | — |
| Dimensions (L×W×H) | 70.5 × 44.2 × 32.8 mm | — |
| Weight | 145 g | — |
Dual Touchscreen Setup: Front and Rear Displays
The Osmo Action 4 features two touchscreens: a 2.25-inch rear display at 360x640 resolution and 326 ppi for shooting and menu control, and a 1.4-inch front screen at 320x320 and 323 ppi oriented toward the subject for vlogging and selfie framing. Both panels are touch-responsive and remove the need for a companion phone during most shoots. Bright outdoor sunlight can reduce legibility on both displays, which is a common limitation across the action camera category.
Battery Life and Field Practicalities
The 1770 mAh (6.8 Wh) battery is rated at approximately 160 minutes of runtime at 1080p/24fps. In practice, intensive modes such as 4K/120fps with stabilization active reduce runtime considerably; users report approximately 70 to 90 minutes in high-load scenarios. DJI offers a Multifunctional Battery Case accessory that approximately doubles effective capacity and adds a side-charging door for in-field swaps without powering down.
Waterproofing Without an External Housing
A practical differentiator for the Osmo Action 4 is its 18-meter waterproofing rating without any external case, making it ready for rain, surf, and shallow diving directly out of the box. According to Imaging Resource's action camera coverage, waterproofing without a housing is an increasingly important criterion for action cameras used in water sports. For deeper submersion down to 60 meters, DJI's optional Waterproof Case is available as an accessory.
Ergonomics, Size, and Mounting
The camera body measures 70.5 x 44.2 x 32.8 mm and weighs 145 g, compact enough for helmet mounts, chest harnesses, and handlebar clamps without adding noticeable drag. The form factor matches other cameras in the category, and DJI's mounting ecosystem covers a wide range of activities. The magnetic quick-release mount system introduced with this generation simplifies attachment and removal between shoots.
Connectivity: Wi-Fi, Bluetooth, and USB-C Transfer
The Osmo Action 4 connects via 802.11 a/b/g/n/ac Wi-Fi and BLE 5.0 Bluetooth, with the DJI Mimo app handling wireless control, live preview, and basic editing. Bluetooth 5.0 enables low-energy remote control and quick pairing, while Wi-Fi supports file transfer to a phone or laptop. For large 4K/120fps or D-Log M files, physical USB-C transfer is the fastest option and avoids the compression that some wireless transfer methods apply.
Honest Limitations to Consider Before Buying
The Osmo Action 4 has no optical zoom and no variable aperture, limiting creative control compared to larger cameras, and the absence of a mechanical shutter means rolling shutter artifacts can appear on very fast lateral movements. At 10 MP effective resolution, still images are functional but smaller than those from cameras designed primarily for photography. Reviewers note that wind noise at speed remains a challenge without an external windscreen, and the built-in microphones perform adequately only in sheltered conditions.
Who the Osmo Action 4 Is Built For
This camera is designed for athletes, outdoor enthusiasts, and content creators who need a rugged, waterproof, mount-ready camera delivering 4K footage with strong electronic stabilization and real color grading latitude. Consensus indicates it competes well for users who prioritize sensor size and low-light performance over maximum field of view. Users who shoot primarily in variable lighting and intend to grade footage in post-production, particularly in outdoor sports or travel contexts, represent the core audience.
Value and Positioning in DJI's Action Camera Range
At its 2023 launch price, the Osmo Action 4 sits at a premium within DJI's action camera lineup, and DJI ecosystem accessories including the Multifunctional Battery Case, mount adapters, and the diving kit extend the camera's capability without requiring third-party hardware. Users upgrading from the Osmo Action 3 will find partial accessory compatibility, reducing the effective cost of switching. The combination of a 1/1.3-inch sensor, 4K/120fps recording, 10-bit D-Log M, and HorizonSteady stabilization represents a meaningful capability package relative to the asking price.
Frequently Asked Questions
- Can the DJI Osmo Action 4 shoot 4K at 120fps?
Yes. The Osmo Action 4 records 4K (3840x2160) at up to 120 frames per second. This allows footage to be slowed to approximately 20 percent speed in a 24fps timeline while retaining full 4K pixel resolution. For even more extreme slow motion, the camera also offers 1080p at 240fps, which corresponds to 8x slow motion, making it well-suited to fast-moving sports and wildlife subjects.
- Is the DJI Osmo Action 4 waterproof without a case?
Yes. The Osmo Action 4 is rated waterproof to 18 meters without any external housing, so it can be used in rain, surf, and shallow water directly out of the box without attaching a separate case. For deeper submersion, DJI offers an optional Waterproof Case that extends the waterproofing rating to 60 meters, suitable for recreational diving and similar activities.
- What is the difference between RockSteady and HorizonSteady on the Osmo Action 4?
RockSteady 3.0 and its stronger variant RockSteady 3.0+ are electronic stabilization modes that correct shake while keeping a wide field of view. HorizonSteady is a more aggressive mode that locks the horizon level through full 360-degree rotations, which is particularly useful for skiing, surfing, and cycling where the camera rolls significantly during the activity. The trade-off for HorizonSteady is a reduced field of view compared to RockSteady modes, so the choice between modes depends on whether horizon leveling or field of view is the higher priority.
- Does the DJI Osmo Action 4 shoot in log format for color grading?
Yes. The camera supports 10-bit D-Log M video recording, which is DJI's flat color profile that retains more highlight and shadow detail than standard profiles for use with color grading software in post-production. DJI provides LUTs to convert D-Log M footage to standard Rec.709, and the 10-bit depth stores 1024 tonal levels per channel compared to 256 in 8-bit, providing considerably more grading latitude for recovering highlights and shadows.
- How long does the DJI Osmo Action 4 battery last?
DJI rates the 1770 mAh battery at approximately 160 minutes of runtime at 1080p/24fps. In more demanding modes such as 4K/120fps with stabilization enabled, runtime is shorter; users report figures in the 70 to 90 minute range. The optional Multifunctional Battery Case accessory approximately doubles effective capacity for extended shooting sessions and includes a side-charging door for battery swaps without powering down the camera.
- What sensor size does the DJI Osmo Action 4 have and why does it matter?
The Osmo Action 4 uses a 1/1.3-inch CMOS sensor with 10 effective megapixels, which is notably larger than action cameras using 1/2-inch or smaller sensors. A larger sensor means each photosite captures more light, leading to better performance in low-light conditions and reduced noise at higher ISO values within the camera's 100 to 12800 ISO range. The practical result is cleaner footage in indoor, evening, or overcast shooting conditions compared to action cameras with smaller sensors.
- How does the DJI Osmo Action 4 compare to the Osmo Pocket 3 and DJI drones?
The Osmo Action 4 is designed for body-mounted and physically demanding use cases where ruggedness and waterproofing are priorities, while the Osmo Pocket 3 is a handheld stabilized camera with a physically moving gimbal that is better suited to controlled handheld shooting rather than mounting to helmets or harnesses. The Mini 4 Pro and Mavic 3 Pro are aerial cameras targeting a different capture scenario entirely. The Osmo Action 4 is the appropriate choice when the camera must be mounted, worn, or submerged during physical activity.