Between the Osmo Action 4 and HDR-AS300, the Osmo Action 4 comes out ahead in max 4k fps and horizon lock, while the HDR-AS300 wins on waterproof depth. Overall, the Osmo Action 4 scores 95 and the HDR-AS300 scores 58.6 on our Mars Score.
Which should you buy?
The Osmo Action 4 is the clear pick on raw spec strength, leading by 36.4 points on the Mars Score. The margin is wide enough that the underdog only makes sense if its individual strengths line up with what you specifically need.
Pick the Osmo Action 4 if you care most about max 4k fps and horizon lock. The biggest gaps in its favor are max 4k fps, horizon lock, max video, among others.
Pick the HDR-AS300 if you care most about waterproof depth. Its strongest claims are waterproof depth.
There are no meaningful ties on the headline specs — every popular-comparison metric has a winner.
Bottom line: the Osmo Action 4 is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Why DJI - Osmo Action 4 wins
- ▲Max 4K fps — 100.00% more. 120 vs 60.
- ▲Has Horizon lock.
- ▲Max video: 4K120 (vs 4K60).
- ▲Stabilization: gimbal-class (vs advanced).
Why Sony - HDR-AS300 wins
- ▲Waterproof depth — 233.33% more. 60 m vs 18 m.
Spec comparison
Video
| Spec | DJI - Osmo Action 4 | Sony - HDR-AS300 |
|---|---|---|
| Max video | 4K120lead | 4K60 |
| Max 4K fps | 120lead | 60 |
| HDRⓘ | truelead | false |
| Log profileⓘ | truelead | false |
Stabilization
| Spec | DJI - Osmo Action 4 | Sony - HDR-AS300 |
|---|---|---|
| Horizon lock | truelead | false |
| Stabilization | gimbal-classlead | advanced |
Durability
| Spec | DJI - Osmo Action 4 | Sony - HDR-AS300 |
|---|---|---|
| Waterproof depth | 18 m | 60 mlead |
| Weight | 145 g | 109 glead |
| Removable lens | false | false |
Spec-level deep dives
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