That said, it still makes sense to hang onto the film as a backup. But it has to be pointed out how much the original film deteriorated over 37 years. And I'm pretty sure they'd moved from celluloid to polyester by that point. Actually, they apparently didn't commonly move to polyester until the 1990s, so maybe that actually makes sense.
Well they could have done a reprint of the film before it faded. My guess is someone dropped the ball in the preservation process. Despite all the psuh to move everything to digital film is hard to beat as a movie projection medium. It's fairly cheap and the mechanics of projecting it our straightforward. Digital projectors of decent quality on the other hand are really expensive. It's also worth noting that IMAX films are shot and projected on what basically is medium format film.
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