Carl Zeiss Jena Sonnar 3,5/135mm.MC Tele Lens,M42,Germany Tele Lens Carl Zeiss Jena M42 cameras. This is very good lens - one the best lens ever made by Carl Zeiss Jena. Photographers here love this lens and some of them use it with adapter even  on their high end Canon or Nikon cameras! It will work with any M42 camera. Lens Carl Zeiss Jena Sonnar 3,5/135mm. MC Ser. No. 9904514 + original case Glass clean, no fungus. The diaphragm-control ring turns smoothly and accurate. The focusing is smooth and precise. There are some micro dust  does not affect the quality of the photos..