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:

Magnifying devices intended to be used with photographic equipment, particularly on the ground glass of large format view cameras to achieve critical focus. These are also typically used to view exposed film.