Used Pentax M (SMC) 50mm f/2.0 Lens - smooth focus.  All images not of the lens itself are with this lens using my KP.  All images are direct from the camera without any adjustments in post.  Lens has smooth focus and does not appear to have any issues with aperture, fungus, etc.  A nice prime lens that still works as it should.  Please let me know if you would like to combine shipping on multiple items before purchase.