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As far as I have been told all IMAX presentations are in 1.90:1. That is for both 2D and 3D. There are no film prints.
As I have answered elsewhere, my regular colorist and I specifically timed the IMAX version of BR2049, just as we both had done for 'Skyfall', which was also released in IMAX. It did not go through the IMAX custom DMR process, which utilizes grain/noise reduction and all the rest. We did not feel we needed noise reduction.
The film is primarily shot and framed for 2.40:1 in 2D.Back to Composition...