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This article is from the rec.arts.movies.tech FAQ, by Scott E. Norwood snorwood@nyx.nyx.net with numerous contributions by others.

7.7 How are 70mm films displayed on television or videotape?

There are two ways to do this. The simpler method is to use a 35mm
(or, gasp!, 16mm) reduction print, which can be transferred to
videotape in a conventional fashion. The more complicated method,
though the one which provides better quality, is to transfer a 70mm
print at Crest National Film Laboratory, which has modified a Rank
(tm) machine to accept various formats of 70mm material at various
frame rates.

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