M39 to M42 Adapter Ring for Zenit Lenses

This 39mm to 42mm adapter ring allows use of older M39 Zenit lenses on any M42 screwmount body (Pentax, Praktica, Chinon, newer Zenits and many others). It is first installed on a lens, and then the lens is screwed into a camera body.The lens is shown for illustration only and is not included