1877
The 11-mile long, 600 lbs IMAX print of ‘OPPENHEIMER’
(i.imgur.com)
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15/70 is the IMAX film format, using horizontal frames, 70 mm tall and 15 perforations across, in comparison to regular 70mm (large format) film which has much smaller frames turned vertically that are ~5 perforations tall.
Thinking about it now, I probably should have guessed it given the context. Hindsight and all that. 😆