Pretty as it is, 70mm film has been deemed too expensive for shooting Hollywood productions. So this is how IMAX preps finished movies for the bigger-screen demands of IMAX. ( Left, 35mm reel. Right, IMAX reel .) Before we move on, let’s explain IMAX film. Technically, it’s a 70mm standard that—unlike the 70mm that was popular back in the day with big movies like Lawrence of Arabia —has been turned sideways on the celluloid. So while typical 70mm motion picture film runs vertically and takes up 5 perforations on the film strip, IMAX runs horizontally and takes up 15 perforations. Yes, that means that the IMAX 70mm standard is three times bigger than normal 70mm and nine times bigger than 35mm

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