There seems to be a problem with the aperture control in that you can have the lens wide open but once the pin is depressed it will go to fully closed regardless of the setting on the aperture ring.
So I am selling the lens as parts or not working .
Good clean original lens .
The optics are clean with no scratches or fungus just the usual dust
I have also included some test shots taken using the lens.
The focus is working as should.
Serial number - 504796.
Camera fitting Mount - PENTAX M42 SCREW
Buy with confidence I accept all returns..