Sun Oct 04, 2020 11:21 am
I'm seven years late to this discussion, but for what it's worth, 2.35:1 was the old Cinemascope ratio. The standard was changed by SMPTE (at Panavision's instigation as I recall) in 1970. It's sometimes rounded to 2.4 and then a 0 tacked on, but it's really 2.39:1. The DCI standard mentions two standard projection ratios, namely 1.85:1 and 2.39:1 (to the nearest two decimal places anyway), both achieved by cropping the full 4096x2160 frame (which is approximately 1.9:1).
While I'm at it, Academy ratio was 1.375:1 (or 1.37:1 if you prefer), not 1.33:1 as you often see. (Adding the optical soundtrack ate into the picture area by about 2 mm and the Academy decided to reduce the frame height by the same 2 mm, which also hid splices better.)