Blux Lens is a great app that lets you out from behind the camera to add some much needed variety to your technique. You can connect two devices remotely via wifi and use Blux Camera to control Blux Lens then place your new lens anywhere. Blux Lens is temporarily free, usually this app retails for $0.99/£0.69, download here. Blux Camera Pro retails for $2.99/£1.99 and you can download it here.