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I would be shocked if your IMAX screening is not 1.90 : 1. Why would thi film be screened in 70mm IMAX? The 70mm film IMAX specification is closer to 1.43 : 1, which this film is not in, as far as I know. IMAX's standard digital specification is 1.90 : 1, and this film was formatted specifically for 1.90 : 1 for IMAX.
If the screening is 2.4 : 1, that's not IMAX because it's not the IMAX digital spec.Back to Composition...