Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Furnishings and Equipment (hierarchy name)
4. Tools and Equipment (hierarchy name)
5. equipment
6. [equipment by process]
7. image-making equipment
8. photographic equipment
9. [cameras and camera accessories]
10. camera accessories

Anotations

Scope note:

Removable or fixed camera backs that incorporate a ground glass (or plastic) screen on which an image projected from a lens is brought into focus. This is then removed, or a film holder is inserted in front of this to make an exposure.