You found this at a swimming pool? Crazy š Of all the things for people to leave lying around; car keys, gym bags, IMAX film framesā¦ heh. I noticed the sprocket holes are top and bottomā¦ is that an IMAX thing? Iām not that knowledgeable about modern film prints.
Bizarre find, right? And yeah, IMAX runs horizontally. Itās the same film as standard 70mm, but by running it horizontally they get substantially more resolution out of it.