# FPV camera sizes (nano 14, micro 19, mini 22, full 28 mm) and DJI O3 / O4 air unit dimensions

> What size is a micro FPV camera?

- Category: Electronics › RC & drones
- Kind: Modern device
- Basis: DJI specs; camera makers' pages via dealers; mount holes for O4 Pro from a maker review
- Page: https://xemstudio.com/objects/fpv-cameras-and-air-units/ · JSON: https://xemstudio.com/api/geometry?object=fpv-cameras-and-air-units · Plain text: https://xemstudio.com/objects/fpv-cameras-and-air-units/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); linked files under their publishers' licenses
- Use in every chat: add https://xemstudio.com/mcp as a connector (https://xemstudio.com/use-with-ai/)

**Exact dimensions.** True size, with no printing tolerance added.

## Notes

- Camera body classes by front width: nano 14 × 14 (Caddx Ant), micro 19 × 19 (Caddx Ratel 2, 19 × 19 × 20), mini 22 × 22, full 28 × 28 (mini cameras often ship with a 28 mm adapter).
- Side M2 screw positions are not published for these cameras, so the cages have slots instead of holes.
- DJI O4 Air Unit Pro: camera 25.55 × 20 × 23.3, VTX 33.5 × 33.5 × 13 (32 g with camera); VTX M2 threads on 20 × 20 and 25.5 × 25.5, camera 2 × M2 16 apart (maker review). DJI O4 (lite): camera 13.44 × 12.36 × 16.5, VTX 30 × 30 × 6.
- DJI O3 Air Unit: VTX 32.5 × 30.5 × 14.5, camera 21.2 × 20 × 19.5, 25.5 × 25.5 mount. Planes and cars: use the 19 or 22 cage on a tilt plate; vibration-isolate with TPU.

## Sizes

| unit | camera_mm | vtx_mm | mount | weight_g |
|---|---|---|---|---|
| nano class (Caddx Ant) | 14 × 14 | None | None | 2 |
| micro class (Caddx Ratel 2) | 19 × 19 × 20 | None | None | 5.9 |
| mini class (Foxeer Predator 5 Mini) | 22 × 22 | None | 28 mm adapter | 8.7 |
| DJI O4 Air Unit Pro | 25.55 × 20 × 23.3 | 33.5 × 33.5 × 13 | 20 × 20 and 25.5 × 25.5 M2 | 32 |
| DJI O4 Air Unit | 13.44 × 12.36 × 16.5 | 30 × 30 × 6 | None | 8.2 |
| DJI O3 Air Unit | 21.2 × 20 × 19.5 | 32.5 × 30.5 × 14.5 | 25.5 × 25.5 | 36.4 |
| ELRS nano receiver (BetaFPV) | None | 12 × 19 | None | 0.7 |
| VTX (Rush Tank Ultimate Mini) | None | 28 × 28 × 3.3 | 20 × 20 | 4.46 |

## Where the files are

- DJI: [O4 Air Unit specs](https://dji.com/o4-air-unit/specs) — web — Publisher's page; dimensions are facts
- Unmanned Tech blog (maker review): [DJI O4 technology review](https://blog.unmanned.tech/dji-o4-fpv-technology-review/) — web — Publisher's page; dimensions are facts
- GetFPV (DJI spec): [DJI O3 Air Unit](https://www.getfpv.com/dji-o3-air-unit.html) — web — Publisher's page; dimensions are facts
- ReadyMadeRC (Caddx spec): [Caddx Ant](https://www.readymaderc.com/products/details/caddx-ant-fpc-camera) — web — Publisher's page; dimensions are facts
- Unmanned Tech (Caddx spec): [Caddx Ratel 2](https://www.unmannedtechshop.co.uk/products/caddx-ratel-2-1200tvl-fpv-camera-2-1mm) — web — Publisher's page; dimensions are facts
- Rotorama (Foxeer spec): [Foxeer Predator 5 Mini](https://www.rotorama.com/kamery/foxeer-predator-v5-mini) — web — Publisher's page; dimensions are facts
- BetaFPV: [ELRS Nano receiver](https://betafpv.com/collections/expresslrs-series/products/elrs-nano-receiver) — web — Publisher's page; dimensions are facts

## Free STEP/STL (5 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/fpv-cameras-and-air-units/index.json

- camera-cage-14mm: [STEP](https://xemstudio.com/files/hardware/fpv-cameras-and-air-units/camera-cage-14mm.step) · [STL](https://xemstudio.com/files/hardware/fpv-cameras-and-air-units/camera-cage-14mm.stl) — Side-plate cage for 14 mm FPV cameras: M2 slots for the side screws (any position), 2 × M3 base
- camera-cage-19mm: [STEP](https://xemstudio.com/files/hardware/fpv-cameras-and-air-units/camera-cage-19mm.step) · [STL](https://xemstudio.com/files/hardware/fpv-cameras-and-air-units/camera-cage-19mm.stl) — Side-plate cage for 19 mm FPV cameras: M2 slots for the side screws (any position), 2 × M3 base
- camera-cage-22mm: [STEP](https://xemstudio.com/files/hardware/fpv-cameras-and-air-units/camera-cage-22mm.step) · [STL](https://xemstudio.com/files/hardware/fpv-cameras-and-air-units/camera-cage-22mm.stl) — Side-plate cage for 22 mm FPV cameras: M2 slots for the side screws (any position), 2 × M3 base
- camera-body-19x19x20: [STEP](https://xemstudio.com/files/hardware/fpv-cameras-and-air-units/camera-body-19x19x20.step) · [STL](https://xemstudio.com/files/hardware/fpv-cameras-and-air-units/camera-body-19x19x20.stl) — Micro 19 mm FPV camera body envelope 19 × 19 × 20
- dji-o4-pro-camera-25.55x20x23.3: [STEP](https://xemstudio.com/files/hardware/fpv-cameras-and-air-units/dji-o4-pro-camera-25.55x20x23.3.step) · [STL](https://xemstudio.com/files/hardware/fpv-cameras-and-air-units/dji-o4-pro-camera-25.55x20x23.3.stl) — DJI O4 Air Unit Pro camera envelope 25.55 × 20 × 23.3

## Questions

**How big is a micro FPV camera?**

19 × 19 mm at the front (about 19 × 19 × 20).

**How big is the DJI O4 Air Unit Pro?**

Camera 25.55 × 20 × 23.3, VTX 33.5 × 33.5 × 13 mm.

## Fits with

- [Flight controller and ESC stack sizes: 30.5×30.5 M3, 20×20, 25.5 / 26 whoop, 16×16 nano, wing FCs, Pixhawk](https://xemstudio.com/objects/fc-esc-stack-mounts/)
- [FPV drone motor sizes: 1104 to 3115, shaft, prop thread and mount patterns](https://xemstudio.com/objects/fpv-drone-motors/)
- [RC servo sizes: 9 g micro (SG90, MG90S), standard (Futaba S3003, Hitec HS-311), 1/4 scale (HS-805BB)](https://xemstudio.com/objects/rc-servos/)