Aluminum Metal Cage Protective Frame for DJI Osmo Action Series

In this review the KETOPKIN Aluminum Metal Cage is examined for owners of the DJI Osmo Action 3, Action 4 and Action 5 Pro who need a low-weight protective solution that keeps full functionality. The bottom line: this metal cage is best for users who want a durable, precisely fitting frame with a built-in magnetic quick release system that lets them switch between horizontal and vertical shooting without removing the camera. It excels at protection, accessory mounting and convenience during active shooting.

Key Features

• Aviation aluminum alloy build: CNC processed construction gives a rigid shell that protects the camera while remaining lightweight for handheld and mounted use.
• Inner silicone gask fit: The rabbit cage design with inner silicone gask provides a snug, scratch-free fit that secures the Action 3/4/5 Pro during movement.
• Magnetic quick release adapter: The included magnetic adapter mount supports common action camera accessories and enables fast attachment and detachment for varied setups.
• Horizontal and vertical shooting: Bottom and side magnetic mounts let users switch shooting orientation quickly to unlock more angles without needing new mounts.
• Full access design: Flip-top and hollow-out construction allow battery replacement, charging and touchscreen access without taking the camera out of the cage.
• Accessory-ready interface: Cold shoe mount and 1/4'-20 thread hole provide direct mounting points for microphones, lights, tripods and selfie sticks.

Who It's For

The cage is ideal for vloggers, action sports shooters and travel creators who use the DJI Osmo Action 3, Action 4 or Action 5 Pro and want a sturdy, lightweight protective frame that preserves access to controls and the touchscreen. It suits shooters who frequently change orientation and attach accessories such as microphones or lights.

It is less suitable for users who need full waterproof housing for underwater use or those who prefer a soft neoprene sleeve with minimal mounting options. If absolute weather sealing or integrated gimbal compatibility is required, look for a dedicated waterproof case or purpose-built gimbal mount.

Pros & Cons

Pros

• Precision CNC aluminum construction offers strong protection without much added weight.
• Magnetic quick release adapter makes swapping mounts and switching orientations fast and practical.
• Full access to buttons, touchscreen and battery without removing the camera improves workflow on shoots.
• Cold shoe and 1/4'-20 thread expand accessory options for audio and lighting.

Cons

• The cage is not a waterproof housing, so it does not replace specialized underwater protection.
• Magnetic mounts rely on proper alignment and may need occasional checking during high-impact activities.

Specifications

Our Verdict

The KETOPKIN Aluminum Metal Cage is a practical, well-made accessory for Action 3/4/5 Pro owners who want durable protection plus fast orientation changes and accessory mounting. Its CNC aluminum shell and silicone gask give reliable protection and a precise fit, while the magnetic quick release system adds workflow value for creators who switch setups often. For non-waterproof protective mounting with strong accessory flexibility, this is good value.

Frequently Asked Questions

Will the cage allow charging and battery changes?
Yes. The flip-top and hollow-out design provide access to the touchscreen and battery compartment for charging or replacement without removing the cage.

Does the quick release work with other mounts?
The magnetic quick release adapter is compatible with the original magnetic quick release mount for the Osmo Action cameras and the KETOPKIN magnetic adapter mount; it also works with common action camera accessories.

Is this a waterproof housing?
No. This is an aluminum protective cage designed for impact protection and mounting; it does not provide underwater sealing or full waterproof protection.