|photography related industry in Rochester (New York)|
|American Camera | Bausch & Lomb | Blair | Century | Crown Optical Co. | Elgeet | Folmer & Schwing | Gassner and Marx | Graflex | Gundlach | Ilex | JML | Kodak | Milburn | Monroe | PMC | Ray | Reichenbach, Morey and Will | Rochester Camera and Supply Co. | Rochester Optical Co. | Seneca | Sunart | Walker | Wollensak|
|and in Rochester (Minnesota)|
| graflex.org - Rudolf Kingslake's|
"Optical industry in Rochester (N.Y.)"
Crown Optical Co. was a lens maker based in Rochester, N.Y., from 1906 to 1919. It made lenses and binoculars. It was commandeered during WWI to ensure binocular production for the Army. Probably some Crown lenses were used on cameras of Seneca in Rochester and McIntosh Stereopticon Co. in Chicago.
- Extreme Wideangle f16 lens for 6.5x8.5" exposures