Quote Originally Posted by brucemuir View Post
Hitchcock used a different framerate sometimes for effect and quite a few others.

I recently saw a docu on the great cinematographer Jack Cardiff where it mentions his use of the technique in the classic ballet "The Red Shoes"

He varied the framerate so the dancer would hover in the air for a split second longer than normal.
I understand what you are saying, but I was talking about frame copies, as opposed to just speed frame variation.