|Posted: Fri Feb 12, 2016 3:16 am Post subject:
|Not a positive identification, but I think it's most likely a magic lantern lens - an early sort of slide projector.
Many had quite long focal lengths. I have a 12".
This is a rather large one.
Some were Petzvals, some Triplets.
I like Pentax DSLR's, Exaktas, M42 bodies of all kinds, strange and cheap Japanese lenses, and am dabbling in medium format/Speed Graphic work.