Contax Yashica male female mount extender (38mm) Description: Left overs from my own lens lab. You can use these Contax Yashica extenders in your personal proyect with Contax Yashica camera or lenses. They add around 38mm to the optical train once inserted (exactly 37,60mm). High quality 170gr weight. The recovery spring in the male part is working good (here it has two springs that connect with the female part, and they seem some kind of auto engagement tabs. Issues: some normal marks from normal usage.