I remember reading something about all of this years ago. I can't believe I forgot. Thank you.
Ha, someone ought to change all this: http://en.wikipedia.org/wiki/Comparison_of_movie_cameras#35_mm
I'm getting more and more reliable sources saying that their shutters are adjustable halfmoons and not butterflies. So with every half rotation of the reflex mirrors, the shutter would make a full rotation?
Makes sense!
Simon;
Hmm. I understand camera designs of today are based on cameras of the past, if that's what you were trying to explain, but what I was really looking for was why the engineers of our modern workhorses today might have chosen one design in their camera vs another. A shutter that takes up less space? I get that, other complication aspects aside :)