This 35mm MOS camera is probably the most widely used camera in the world.  Many feature films have been shot in their entirety with this camera by means of a sound proofing blimp. But the camera has most widely been used as a b-roll camera where sound is not as important as maneuverability and flexibility. Some of these old cameras (produced in the 50s and 60s) are still in use today in commercial work. And the camera that have replaced are the updated Arriflex cameras like the Arri3 and the 435.