How much are true IMAX films cropped by to fit onto digital screens (and vice versa)?

[hakunamufasa]

Originally Posted by singhcr

The answer to your question is no. Interstellar is coming out in IMAX 70mm today, and it has a mix of 2.40:1 35mm material and 70mm IMAX. The entire screen will be used for the IMAX footage, but the rest of the movie will be letterboxed so none of the image is cropped off.

I know that, but I'm talking about films that aren't filmed with IMAX cameras for their entirety (e.g. 35mm for the entirety of the film but that've been DMR'ed). Some films such as Guardians of the Galaxy did change aspect ratios throughout the IMAX 3D version (http://www.ropeofsilicon.com/guardia...atios-imax-3d/), but what about the stuff such as The Lion King (shown in IMAX in 2002) that doesn't shift aspect ratios? They aren't shown as normal with the black bars at the top and bottom; that wouldn't be an IMAX presentation if it was normal throughout.

Thanks for the info though and the protected zone info; didn't know that the area had a name even though I knew about the area itself.