IMAX vs. IMAX 70mm: The difference between these two cinema formats | Hacker News

A Hacker News thread corrected several technical claims about IMAX and IMAX 70mm.

Commenters disputed details about resolution, projector lamps, and how many 15/70 IMAX theaters exist.

The discussion shifted to why aspect ratios differ and why films cannot just be resized to fit any screen.

The takeaway: large-format film, screen geometry, and projection limits determine what audiences actually see in theaters.