And to be blunt, there is a lot of imperfection in what you actually see on the screen. It depends on how accurately the theater was built and how well the camera is aimed at the screen, how the film is adjusted in the projector, and any curvature that shows up. From the 35 mm scans that have been done, all the 2.39:1 versions from LD to streaming, capture more of the image from the film than you would have seen in a theater. The various impefections in how films were projected from film meant that some of the image was projected on the black area surrounding the reflective screen and went unseen. In ANH, the wide shot of Vader walking over to the Falcon in the Death Star Hanger has two stormtroopers on either side of the screen. When I saw the SE in the theater in 97, they were partly cut off, but on the DVD, Blu-Ray, Disney+ and the 35 mm scan of the 1977 prints, you fully see all the stormtroopers and a bit of the hanger on either side.