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When the shutter is open, the film is exposed. When it closes, the next frame of film is brought into position by the claw.

Adjusting the shutter angle affects the amount of time that film is exposed to light.

A rotary disc shutter is a type of shutter. It is notably used in motion picture cameras. Rotary shutters are semicircular discs that spin in front of the film gate, alternately allowing light from the lens to strike the film, or blocking it.