Is Alai 65 16:9?

Photographed by Alai 65IMAX camera, the maximum native frame ratio of this camera is 2. 1 1: 1. At present, the mainstream 1.9 screen projection has black edges above and below, but it will not be as huge as the 2.39 scale black edges.

If the mainstream screen with the scale of 1.9 has no black edges, then the current border of 2. 1 1 must be cut to 1.9, which means the screen must be sacrificed. If the screen is an IMAX screen with a scale of 2. 1 1: 1, it is a perfect full-screen screen.