Currently, I am facing a challenge using the 'normal' camera on my iPhone 11 Pro. I have implemented react-native-vision-camera in my project. When executing the following code:
const devices = useCameraDevices();
const deviceBack = devices.back;
console.log(deviceBack?.devices)
I am only seeing two cameras available:
["ultra-wide-angle-camera", "wide-angle-camera"]In summary - Smartphone cameras typically have a wide-angle lens equivalent to around 22mm and 30mm. Therefore, opting for the wide-angle option is recommended as it is considered the "normal" type.
According to the react-native documentation, there are three identifiers for physical cameras on devices:
"ultra-wide-angle-camera""wide-angle-camera" | "telephoto-camera"
"ultra-wide-angle-camera""wide-angle-camera": A built-in wide-angle camera (focal length between 24mm and 35mm).
"telephoto-camera": A built-in camera with a longer focal length than a wide-angle camera (focal length above 85mm).
With that clarified, let's examine camera focal lengths equivalent to phone cameras' focal lengths (source)
| Camera type | Focal length | Angle-of-view |
|---|---|---|
| Wide-angle | 22mm to 30mm | ~84° to ~62° |
| Telephoto | 50mm to 80mm | ~40° to ~25° |
| Ultrawide-angle | 12mm to 18mm | ~112° to ~90° |
| Periscope | 103mm to 125mm | ~20° to ~16° |
The ideal "normal" focal length is considered to be 35mm, so selecting the wide-angle option is suggested since it closely aligns with this standard (and may even provide an angle of view closer to 35mm). Additionally, wide-angle lenses are commonly used in phone cameras.
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