If the rear lens group of these superfast lenses is removed, you get much longer working distance. I hardly need add that the level of optical aberrations skyrockets concomitantly, but hey, you don't shoot with these lenses to get *ultra sharp* pictures do you?
I tried this trick briefly with my Oude Delft Rayxar 65 mm f/0.75 lens. Autumn colours came through beautifully and of course, such a lens is just about bokeh. In fact, so much bokeh there hardly is room for anything else.
Shot this morning with the Df literally on my door step. This kind of lens visually "enlarges" any space to the extreme so you hardly need to move around to find new scenes