Thank you DNG and Kermaier for feedback !
The lens was an Apo Summicron 90 Asph., @ ISO 160. Dont believe ? Well, I wanted a bokeh panorama here and made 36 single exposures as DNG. Stitched as a mosaic, this makes for a whopping 130 MP wide-angle aspect photo with lots of detail as you can imagine. Calculated in 35 mm terms, this is a 30 mm f: 0.7 lens bokeh. Actually, it is a 90 mm lens f:2.0 on a virtual 7 x 11 cm sensor, larger than a MF system that costs $$$. Anyway, my aim was the bokeh. With lots of detail available, I could easily pull back the local contrast in Silver Efex without quality loss, and pushed the overall contrast and added a vignette (setting called "Holga" in Silver Efex). This sw is really good, the grain looks quite realistic.
Bokeh panoramas are really nice sometimes. Already 3x3 shots with the 90 2.0 make for a 50 1.0 bokeh ...
Carsten