Hello!
I'm interested in Pantoscop No.4 lens. I found some info about lens (185mm, will cover 25x30cm, something similar to "globe" and etc.), but I was trying to find some information how does this lens perform in real life and... no success.
Is it any good to use today or it is just a collector's item? How is picture quality (I understand, not so good as modern WA lens, but is it still usable)?

Hope some of you had experience with this lens and could share info, or just have seen "review" somewhere. Any info about this lens is welcome.

Thank you.