I bought a 19th-century camera and was wondering if anyone by chance had some helpful info about the lens? I've searched from links here and my own research and not making much progress, and hoping someone here may know something. It has '18491 / C. Berthiot Fabricant Opticien Paris / No. 3' engraved. Would also like to know aperture size since it is not listed and I've tried doing the focal length/diameter but the math just doesn't seem right...any help is appreciated.
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