Quote Originally Posted by cmacd123 View Post
... Movie Camera neg is GENERALLY on acetate. before digital intermediate, the camera negative was cut and spliced in the editing shop. Things like IMAX Require the strength of Poly in the Camera. ...
I remember that when DuPont was still making movie stock, they put their negative and reversal materials on their (patented) polyester Cronar base. This was a different material than Estar, and it was less subject to light piping. The point is that it can be done and was done on a commercial scale quite successfully. Whether that is in store for future film is a question.