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This API is available on Firefox OS for privileged or certified applications only.


The focalLength property value is a read-only property that returns a number that expresses the camera's focal length in millimeters.


var focal = instanceOfCameraControl.focalLength


Return a number representing the camera's focal length in millimeters.


var options = {
  camera: navigator.mozCameras.getListOfCameras()[0]
function onSuccess( camera ) {
  var focal = camera.focalLength;

  console.log("The camera's focal length is: " + focal + "mm");

navigator.mozCameras.getCamera(options, onSuccess)


Not part of any specification; however, this API should be removed when the WebRTC Capture and Stream API has been implemented.

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 Contributors to this page: chrisdavidmills, teoli, MHasan, ajaybhat, kscarfone, Sheppy, Jeremie
 Last updated by: chrisdavidmills,