I have one and I posted some photos made with it recently.
A 100mm slip-on filter made for my 75mm Biogon fits right into the "hood" of the lens. It's a funny lens in a single-speed shutter (B) that seems custom-made. And unfortunately it only opens to f/11; there is an internal stop that closes it to that which I tried to remove but couldn't figure out how. It came on a board for my Wista already which is partly why I bought it.
I actually bought this one on eBay from a well-known...err, infamous...photographer.
Anyway, I apparently never posted them properly on my blog, so I will rectify that tonight (edit:
here you go!). I would have to dig through my posts to find the images I posted here months ago. It was super-sharp though and a nice FL on 8x10.
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