This helicoid adapter is 99% similar to original angenieux 35/2.5 L39 mount lens,  if your lens in exakta mount or m42 mount or else, it is very easy upgrade to Leica M mount in just a few minutes. This adapter made of  solid brass and aluminum, RF coupled about 3ft to infinity. come with L39-M adapter, you may use it on screw mount bodies or M mount bodies.

only 2 easy steps:
  • use screw drive take of screw on rear retaining ring then take off retaining ring (no retaining ring needed anymore)
  • screw in lens with proper size of washer, use camera live view make sure lens infinity position image is also infinity