For all who search for a lens hood for the Steinhein Culminar 85mm f2.8:
this lens has an unusual E36.5x0.5mm filter mount. I ordered an alloy step-up ring with the thread size E36.5 to E52 ("Soligor for Nikon 885 Adapter 36.5-52"). It fits perfect to the Culminar. In addition I screwed a standard lens hood on it. So the whole length of adapter and hood is 43mm. It shows no vignetting and enhances the contrast of this lens.
BTW: the Culminar has a nice bubble bokeh like Trioplan (look at sample photos).