one slight issue," you mention at <a href=""https://www.youtube.com/watch?v=tozuzV5YZ7U&amp;t=2m03s"">2:03</a> modern cameras "don't take a frame all at the same time like an old school photograph".<br>Well", neither did old school cameras. They still had a physical shutter that needed to open and close, and this would wipe across the film plane.<br>For stills cameras, using higher shutter speed (I think the terminology is above "sync" speed) even meant that the rear curtain would closely follow behind the front curtain, exposing a thin strip of the film as they both moved across - which is precisely the same thing as rolling shutter.