As far as I know, only DTS is setup for 70mm prints. Unless something has changed in the last decade or two. And yes 15 perf 70mm has a frame size 10 times of Academy 35mm. I remember the people at the IMAX theater telling me that, and the brochure they gave me at the time. I believe I still have that brochure, if I can find the photoalbum I stuck it in. I did interviews of viewers as well as IMAX staff at the Vancouver theater back in the day. Back in 1992, one of the staff suggested that they need to make Hollywood movies in IMAX down the road, and the rest is history. I uploaded that interview if anyone wants to hear it. I think part of the reason IMAX works so well for viewers, is because it covers almost all of your normal field of vision. 5 perf doesn't quite do that. You need height in the image as well as width, to do that. 15 perf is of course 3 times the 5 perf frame size. I have an IMAX frame from one of the space movies they made, of the shuttle bay and a satellite inside it, with Earth at the top of the frame. Beautiful shot. I talk on occassion with Andrew from Fotokem about 70mm. Nice guy. He says IMAX is closer to 12K (not 16K) in terms of the detail that makes it onto the final print. Maybe the neg has 16K, but once it gets duped over, its 12K. And their film recorder to output back to 65mm neg, is only 8K at the max. He also said most film outs are only done at 4K, even for IMAX. 8K again is their max resolution for film outs and is rarely done. Im not sure what Nolan did for his films. I did also find out the 5222 neg was optically duped over to color interpositive on Oppenheimer.
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