Leica History of the Bertele Sonnar


"Sceptred Isle"
I have recently come across a very informative article about the history of the "Sonnar" lens and thought that it might be of interest to other members who are interested in "Sonnar" lenses.
The article is in Italian but Google Chrome on Windows will translate it into English.

Please see:- L
Thankyou for posting this- I've hit this page before, and found lots of useful information in this article (after translating!) and can verify the changes to the optical formula as shown.

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