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This library exposes the rear camera's characteristics such as the sensor size, the focal length and the image resolution.

On Android, the Camera2 module is used to get the camera characteristics programmatically.

On iOS, there is no accessible module to do so (see https://stackoverflow.com/questions/13190932/how-to-find-out-focal-length-of-camera-in-ios-and-what-is-the-sensor-height for the existing work around), therefore, the values returned by this library are hardcoded here: https://github.com/AppAndFlow/expo-camera-characteristics/blob/main/src/iPhoneSpecs.ts. We'll try to maintain that list of devices up to date as much as possible.

Installation

This library needs expo-device for iOS.

npx expo install @appandflow/expo-camera-characteristics expo-device

This package cannot be used in the "Expo Go" app because it requires custom native code.

After installing this npm package, add the config plugin to the plugins array of your app.json or app.config.js:

{
  "expo": {
    "plugins": [["@appandflow/expo-camera-characteristics", {}]]
  }
}

And finally, rebuild your app as described in the "Adding custom native code" guide.

npx expo prebuild

API documentation

getCameraCharacteristics()

import * as expoCameraCharacteristics from "@appandflow/expo-camera-characteristics";

const cameraCharacteristics: {
  focalLength: number;
  sensorSize: {
    height: number;
    width: number;
  };
  imageResolution: {
    height: number;
    width: number;
  };
} = expoCameraCharacteristics.getCameraCharacteristics();