With large film stock and cameras come large projectors, which have their own unique way of projecting the film stock vertically. This is the main reason that films shot on traditional IMAX film stock are often under an hour in length non-IMAX films that incorporate the traditional film stock also don’t often shoot more than an hour of footage. This massive film stock is shot vertically on large but noisy cameras that can only ever shoot between 30 seconds to two minutes of 12k resolution footage at a time.