diaphragm shutter

The term diaphragm shutter has also been used to describe an optical stop with a slit, near the focal plane of a moving-film high-speed camera.

The diaphragm shutter is capable of a maximum speed of 1/1000 second, an extra stop faster than most other diaphragm shutters.

The design featured an unusual but simple diaphragm shutter built into the camera body, so the camera could make use of interchangeable lenses without the need for a complex focal plane shutter.

All leaf shutter speeds are limited by the speed at which the leaves can move: typically 1/500th of a second for a high-specification diaphragm shutter and 1/125th of a second for a simple leaf shutter.