I see that you just got a Konica (from the other thread). It's definitely not Konica (but you know that, I am sure). What troubles me is that I see no prongs or levers protruding from the lens mount itself, which makes me wonder how the lens is supposed to work -- what couples it to the camera's shutter and aperture mechanisms? Did the lens come with a rear lens cap that might give a clue -- any letters molded on the lens cap (or other identifier) that would help?