When shooting for IMAX, most of the time he production won’t shoot the entire film on 15-perf, because it’s hard. For instance, in NOPE, ’only’ 48 minutes of footage in the two-hour movie was shot on IMAX cameras —All the film was shot on 65mm celluloid (60% 5-perf 40% 15-perf for IMAX).
The IMAX cameras are larger and heavier and have shorter running times, due to the huge film stock vacuumed inside and rolled at greater speed — the mags only run about three minutes, whereas other film formats can give you a 10-minute load on a mag. So that can limit the way a director shoots. You can’t do super-long takes, and you have to reload more often. Hence, shooting on 15-perf will give you only 3 minutes per 1000 foot magazine, which will cost $1,5000. Yep, shooting 15-perf is expensive and cumbersome. But the main limitations are the noise, dimensions, and weight. However, IMAX will address these parameters with the new fleet of cameras.
formerly Mad Cornish Projectionist.