Special Watkin's Diaphragm designed to give equal spaces between U.S. values for a calculating shutter
- Made:
- 1902
- maker:
- Alfred Watkins
Special Watkin's Diaphragm designed to give equal spaces between U.S. values for a calculating shutter, c. 1902.
Details
- Category:
- Photographic Technology
- Object Number:
- 1927-960
- Measurements:
-
overall: 20 mm, 40 mm, .03 kg
- type:
- diaphragm - optical
- credit:
- Watkins, Alfred
