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16mm is a standard film format, so named because of its 16-millimetre width.
It was the usual format of choice for location filming until the programme switched exclusively to 1" Type C videotape during season 23. Consequently, it was the film stock used when a strike forced the whole of Spearhead from Space to go on location. Spearhead is the only Doctor Who story entirely filmed on 16mm, though many others have large sections recorded in the format.