Wrong and Wrong
IMAX HD's (the current best IMAX standard that you'll see in most theatres that have IMAX 3D) aspect ratio is 2.20:1, which is a much closer ratio to 16:9 (widescreen) than it is to 4:3 (not widescreen). And, by the way, 4:3 is absolutely NOT more immersive than 16:9 - that's crazy. Films have been shot in widescreen for a long time because it IS more immersive. The only reason that 4:3 even still exists as a standard is because the first TVs were square. It also has nothing to do with pupil shape, widescreen is closer to "real life" (and therefore more immersive) because your eyes are lined up horizontally - you see farther left/right when looking straight forward than you do up/down. If we had one eye or our eyes were laid vertically, then yes 4:3 would be more immersive.
I don't know where you watch your IMAX, but you should consider another venue if they're projecting in non-widescreen aspect ratios!
