Quote from the book...According to Kingslake, it is a modified Petzval, since in the basic positon the design reoccurs with the separatable rear group. Fabre on the other hand, places it in the category of multiple focus lenses, together with Chevalier's Verres Combine's and Porro's Anallatic, pointing out its versatility. The versatility of the cone is also underscored by the inscription on the barrel "Paysage" and "portrait". Similar to the later lens "Objectif a foyer multiple et lentils additionelles di Derogy" from 1858, a divergent lens could be mounted at the center of the barrel on the appropriate threads. unquote.
from: Photographic Lenses of the 1800's in France by Corrado D'Agostini.
Looking at the Petzvals of Jamin in the book. He did make normal barrel Petzvals and I still maintain my Albion Albumenizing lens is a Jamin. It has been chromed methinks by a very enthusiastic collector.
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