This is a vintage lens, the Pentacon 50mm f1.8 The Pentacon 50mm 1.8 is a cheap vintage lens that works great on mirrorless cameras for Sony or Fuji x system. The Pentacon 50mm f1.8 is easily found all over Europe but not so much in America. It is a cheap but underrated lens for Praktica SLRs. If you find a Pentacon auto 50mm 1.8, I suggest buying it. It has amazingly large bubble bokeh and pretty sharp wide open. Try looking for this cheap vintage camera lens.