| Dimensions | 50 mm |
|---|---|
| Focal Length (mm) | |
| Max Aperture (f) | |
| Aperture Blades | |
| Elements | |
| Rear Mount | |
| Front Thread | |
| Production | |
| Serial Numbers |
Dallmeyer Series XII 121/3.4
Petzval (air-spaced rear crown + flint) kinematograph projector lens. Silver body, black nose. Marked F=4¾”. Likely in production during, or just after the end of, WW1.






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