The shutter consists of two metal plates with a variable separation between them moving across the focal plane. The plates are connected by a pleated-cloth sleeve to the lens area which cuts off light except to the shutter plates. The separation of the plates is varied by a screw arrangement working on one of the plates. This is set by a lever on the outside of the camera beneath the shutter speed plate. The setting is read against a pointer moving around the speed plate. The tension is provided by a coiled spring and adjusted by an arm on the speed plate. The plates are connected to the shutter spring by cords which wind around a pulley acted on by the spring. The speed plate itself shows the speed for the tension/slit width combination.

Operating the magazine sets the shutter which is released by two levers on the magazine.