Short install, short test, and a few unplanned crashes. This report shows what the Mobula 8 O4 FOV Extender adds, and where it trips up.
TLDR: What you actually need to know
- The extender mounts behind the ND filter, adding a wider field of view to the Mobula 804 O4 camera.
- Fitment: designed to ship with the Mobula 804, which uses the standard 85mm Mobular frame.
- Durability note: frames can become brittle in cold climates, and the presenter still broke frames occasionally in tropical Singapore.
- The presenter used a 3D printed extender lens and reported camera popping out after a crash, glue (E6000) did not cure the problem.
- Video length referenced ends around 05:29, with field tests and comparisons.
- Best for: pilots wanting a wider, more cinematic POV for cinewhoops and freestyle.
- Avoid if: you need a rock-solid, crash-proof camera mount and you fly in very cold conditions.
How do I install the Mobula 8 O4 FOV Extender?
Install it by removing the ND filter and seating the extender lens into the canopy mount, then replace the ND filter if required. The kit has a dedicated mount for ND filters, which lets you swap NDs without removing the extender lens. One canopy version accepts a Flywoo ND filter on the front, so check which canopy you have. The presenter popped the ND filter back into place before heading to the field.
What difference does the Mobula 8 O4 FOV Extender make vs stock lens?
The extender widens the camera's field of view, giving footage a more immersive feel. In the video the presenter says it "increases the feel of view of the light camera" and gives a noticeably wider angle. This is useful for fly-throughs, cinewhoops and close-quarters freestyle where peripheral detail helps. The presenter implies a visible difference, but the exact degree of FOV change is not stated in the video.
Is the Mobula 8 O4 FOV Extender durable?
Durability is mixed, and depends on canopy design and environment. The presenter warns that the Mobular 8 85mm frame can be less durable in cold climates, and even in tropical Singapore he breaks frames occasionally. The specific extender lens in the video was 3D printed rather than moulded, which likely reduces impact resilience. So what: expect better durability from a moulded lens and a robust canopy mount.
How do I fix the camera popping out with this extender?
There is no guaranteed fix shown; the presenter tried glue and the camera still popped out. E6000 adhesive was applied but it did not prevent the camera from dislodging after a crash. One practical option is to use the canopy variant that accepts front-mounted Flywoo ND filters or to buy a moulded canopy with a tighter camera pocket. So what: if you fly aggressively, prefer a canopy and lens combination known for secure camera retention.
When is the FOV extender most useful?
Use it when you want a wider, more cinematic perspective, such as cinewhoops, close indoor flights, and immersive POV runs. The presenter highlights the wider angle as the main benefit and suggests it suits freestyle and cinematic shots. It is not the right choice when you need narrow, telephoto-like framing or when a tiny profile is mandatory. So what: treat it as a visual upgrade, not a structural one.
Does the extender cause vignetting or image issues?
The video does not show consistent vignetting, but a crash induced visible artefacts when the camera popped out. A viewer mentioned vignetting, but the presenter clarifies that the vignette was not intrinsic to the lens; it appeared after a crash shifted the camera so it could see the left-side lens. So what: expect image quality to depend on correct seating and a stable mount, not just on the extender itself.
How did the extender perform in real flights and pilot reactions?
Field tests were positive for immersion, and the wider view was appreciated. The presenter flew the Mobula 804 with the extender in a local field, and chatted with another pilot, David, who was flying a Flywoo Flyfly with a HappyModel crown antenna. The conversation reinforced that pilots prefer FPV for the immersive experience, and the extender adds to that. So what: this is a small, cheap change that makes flights feel bigger to other pilots at the field.
FAQ
Will the Mobula 8 O4 FOV Extender fit other Mobula frames?
Probably, if those frames use the same 85mm Mobular canopy mounting. The presenter refers to the standard 85mm frame. Not stated in the video: exact cross-compatibility with all Mobula variants, so check your canopy shape before ordering.
Can I use Flywoo ND filters with this extender?
Yes, one canopy version has a mount that accepts a Flywoo ND filter on the front. The kit in the video includes an ND filter mount behind which the extender sits. If your canopy is the other variant, you may need a different filter mount or canopy to fit Flywoo NDs.
Why did my camera show a vignette after using the extender?
If you see a vignette, the likely cause is camera displacement after impact, not the extender alone. The presenter says he had a crash and the camera popped out, which made the lens visible on the left side in footage. Check seating and canopy alignment before blaming optics.
How do I stop the camera from popping out?
The presenter tried E6000 glue and it failed, so glue is not a guaranteed solution. Use a moulded canopy with a tighter camera pocket, or pick the canopy variant designed for front-mounted ND filters which may hold the camera more securely. Regularly inspect camera seating after any hard landing.
Will cold weather make the Mobular frame brittle?
Yes, the presenter warns that frames may be less durable in temperate or cold climates. He contrasts that with his tropical Singapore experience where he still breaks frames sometimes. So what: expect lower impact tolerance in cold, and carry spare canopies if you fly in cooler regions.
Is this kit worth buying for a beginner?
It is worth it if you prioritise wider POV footage and accept minor fitment risks. The extender is an easy visual upgrade, but beginners should be aware of potential camera retention issues and consider a moulded canopy for reliability. Not stated in the video: any official warranty details from HappyModel.
Key specs and claims mentioned
- Standard frame size referenced: 85mm Mobular frame.
- FOV Extender Kit ships standard with the Mobula 804 in the video.
- Kit includes a mount for ND filters, allowing ND swap without removing the extender.
- The presenter used a 3D printed extender lens, not a moulded factory version.
- Attempted adhesive: E6000, reported not to stop camera popping out.
- Field test and footage shown, video timestamps up to 05:29.
