Originally Posted by jnanian
Thanks for your kind reply. There are effectively 4 lenses in two groups at rear and front, and I was thinking about a Petzval lens (or a Pretzel ), the front group is effectively a cemented group.
However, I am a little puzzled with the rear group, which is effectively an air spaced doublet, but it doesn't really match the original Petzval design, as described here : http://www.antiquecameras.net/petzvallens.html
Either this is a Petzval design variant (not Rectilinear, as long as I can tell), or someone reversed the rear group after dismantling it.
@Kent : thanks for your reply, my thinking followed exactly your message, the slot for waterhouse stops designed a taking rather a projection lense, but Ian tell us that was not always true.
@Ian, @Smieglitz : I can now confirm it is actually a French lens, or at least a lens with french glasses, as I followed the suggestion of Smieglitz, and looked the elements edges, and found a signature at two places ! Just an handwriten name : "Berthier". It's rather a stunning thing to found such "message" on a thing probably more than a century old...
But Berthier don't seems to have been a well known optics makers, I found nothing on it, and still don't know the lens brand.
Many thanks again for your replies.
Last edited by Raphael; 06-08-2013 at 06:42 PM. Click to view previous post history.
Reason: Bad English...