« DOM Reference

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 certified applications only.


The focusDistanceOptimum property value is the distance in meters where the subject appears sharpest.


var optimum = instanceOfCameraControl.focusDistanceOptimum


Return a number representing a distance in meters.


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

  console.log("The subject looks sharp at: " + optimum + "m");

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, kscarfone, ajaybhat, Jeremie
Last updated by: ajaybhat,