Wollensak Dumont Cro 50 MM f/1.5 Raptar in Adapting lenses to Fuji X Posted August 30 Advertisement (gone after registration) There were at least three versions of this lens, starting with the 50mm f1.5 Anastigmat, then the Raptar and Oscillo Raptar, which was, I believe 51mm. All these lenses were intended for scientific purposes, mostly for capturing CRT traces on oscilloscope tubes. There are quite easily adaptble by wrapping PVC electrician's tape around the rear barrel and inserting via friction fit into an M52 helicoid. Here is a shot with the 50mm f1.5 anastigmat Hello guest! Please register or sign in to view the hidden content.