Hi guys,
I have always found help in this forum, so I am writing for help again here.
I recently acquired a Hermagis lens and now I am trying to find more information about it.
The focal length is around 15 inches. It says it is an f/4. It looks like an Eidoscope but I do not think it is. The front element is a cemented double and the rear is air-spaced.
I would be thankful for any information. When was it produced? Why does it say "BIS" at the end of the first row? What does the "Serie I N4" mean? What kind of design is it? Is there literature about it with more technical info? How does it compare to the famous Eidoscopes?
My beat-up iphone is just for size reference only.
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