Using the Webcam Utility to turn my Z6 into a webcam. I think all Nikon cameras with a USB that outputs video feeds should be able to work with the Webcam Utility, and since it's free there's really no reason to at least try it out. Please let me know if you tried on your camera and if it worked.
WebCam Utility download links:
WIN: http://alan.sg/NIKONWUWIN
MAC: http://alan.sg/NIKONWUMAC
