I've done some work with adapted "X-ray" lenses lately. The Kowa 55mm f/0.8 is lesser well known lens of this kind and unfortunately, due to its broad rear section, cannot be easily forced to infinity focus like the better known Rodenstock Heligon or Oude Delft Rayxar lenses. However, photo opportunities still exist.
Sometimes the extremely fast shutter speeds mandated by these ultrafast lenses mean you capture unseen details. Like the furling patterns on this Pride flag on a windy day.
Nikon Z fc, Kowa 55mm f/0.8, 1/4000 sec at f/0.8