The film industry in the U.S. was really on a tear and many European
camera makers weren't able to keep up with the changes a busy cameraman
demanded. One of the changes was to make viewing for critical focus
through the side door instead of through the rear of the camera. This
eliminated the viewing tube that ran the length of the camera between
the film magazines. This made it possible to get the twointernal film
magazines to touch each other and made the camera more compact. Bass
also made it possible to take the slack out of your film by turning
knobs that came through the outside of the camera.