They're not transferred, they're kept on video. Since the stations want
deliver either on 3/4" or via sat-link, there's no need for the thing to be on
film.
Re: the recorders...one should broaden one's scope of SF beyond the
latest television shows. Orbs, recorders, transcribers, floating TV cameras,
on and on, they have all had a long history in SF.
jms