I have its little brother, a 10" one, that I use with my Graflex Super D 4x5. It's very sharp wide open and out of focus areas are very smooth like those of RR lenses. Not harsh like some Petzval lenses. One advantage of it over a Petzval lens is you can focus sharply on the edge or corner of the your ground glass.
The f/3.5 one is a soft focus lens which I got from this Leicashop a few years ago for half of the listing price of this f/4.5 one. It's one of my favorite lenses.
Do you know the focal length of that Weingartshofer? It sounds very tempting.
Hugo
Bookmarks