Petzval lens coverage Voigtlander & Sohn Nº6409

[Mikelangel]

Hello!

I've seen this petzval lens:





Without any information about the front and rear lens diameter information, no total length, speed..

With the serial number, I know that are early lens (from about 1857) without waterhouse stop slot with approximate speed of f4, and I suspect that are small, with a coverage of 4x5 aprox.

Is this information correct? Can someone provide me more information?


Thank you very much!!!

Miquel.