I understand that in most standard 35mm film the choice of filming in either a 2.4:1 AR or a 1.85:1 AR is up to the director.

With that being said, very recently there's been some IMAX commercials popping up about IMAX films being shown with a 1.89:1 AR as having no black bars and 26% more image. So my questions are as follows:

  1. Does 1.89:1 make that much of a difference compared to 1.85:1?

  2. Is it only possible in an IMAX theater to alternate between aspect ratios or can a director decide to alternate between 1.85:1 and 2.4:1 in a regular theater?

  • I hope you meant 1:89:1, not 1:9:1 since this aspect ratio is not available. – A J Jul 1 '17 at 9:04
  • wait,,,I didnt write "1.9" anywhere... – JustAGuy Jul 1 '17 at 9:05
  • Okay. I have changed it with original. – A J Jul 1 '17 at 9:07
  • no you wrote, but I edited it. – A J Jul 1 '17 at 9:07
  • then yes I did mean 1.89 although the commercials clearly state 1.9... – JustAGuy Jul 1 '17 at 9:09

After doing some digging,

1 - There's A difference. It's not that substantial but it shows per the trailer above.

2 - It's entirely up to the director, although according the IMAX, IMAX featured films usualy go full-screen ONLY in IMAX. Meaning the others are left with the regular black-barred 2.4:1.

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