Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Components (hierarchy name)
4. components (objects parts)
5. [components by specific context]
6. [tool and equipment components]
7. camera components
8. shutters (camera components)

Anotations

Scope note:

Describes photographic shutter mechanisms that are mounted in lens barrels, between lens elements. These most generally have a leaf construction that act as a diaphragm that opens and shuts for specific lengths of time, thus exposing the camera film to light.