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    This feature is not on a current W3C standards track, but it is supported on the Firefox OS platform. Although implementations may change in the future and it is not supported widely across browsers, it is suitable for use in code dedicated to Firefox OS apps.

    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.

    See also

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