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Thank you to all !
Now I have to cut a lensboard and shoot wetplate with it.
Maybe it could be a good surprise ... or an overpriced paperweight :)

tank you a lot for these precious informations !

I try to collect all pieces of the puzzle and i've found this on the web
...

here some pics of a petzval lens that i found :

192321192322192323need Help ! 🙂

Any information about that lens ?

Petzval formula
8cm glass diameter
Maybe 14cm glass to glass