T2 Ring adapter enabling the connection of a M42x.75 thread adapter (present eg in many telescopes, eyepiece extensors or photographic lenses) to the Pentax K camera body.
If you plan to connect a Pentax K reflex body: - with a telescope, pay attention to projection connectors (CLICK) - with a microscope, see microscope adapters with T2 thread (CLICK)
SEE OTHERS T2