300mm f5.6 TeleCongo Lens ... Which doesn't exist?

[mhayashi]

I just found a nice story of the owner of Yamasaki Optical lab.
Use google chrome and translator to read in your language.
https://chiiden.net/山崎光学/

[Dann Corbit]

I just found a nice story of the owner of Yamasaki Optical lab.
Use google chrome and translator to read in your language.
https://chiiden.net/山崎光学/

That was a wonderful article, that you so much for sharing that link!
One of the really wonderful things about LF photography is the connection to history and craftsmanship.

[mdarnton]

Yes, old Prontor Press or Japanese copy of one. Yamasaki was very efficient in making good economically priced lenses but they were always hostage to what the shutter makers could supply on the day. For example I've seen several Congo lenses specified with Copal 3 shutters but actually delivered in Copal 3S shutters just to get them out of the factory door.

Looking for the emblem on the shutter speed dial, I found this shutter with a similar dial, a Durax: https://www.flickr.com/photos/camera...ool-camerawiki

[Dann Corbit]

Looking for the emblem on the shutter speed dial, I found this shutter with a similar dial, a Durax: https://www.flickr.com/photos/camera...ool-camerawiki

Thank you very much for your analysis. After careful examination of both pictures, I am quite sure you are right.
The people in this forum are amazing.