this post was submitted on 14 Jul 2023
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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. 😆