I just purchased a 40 years old Konica 501.7. Was presented as "in good condition", and I bought it without having high expectations. My oh my, since I saw/touched it I was high straight away. It's in pristine condition and looks like came out right from the factory. I have bought many lenses 4/3 and m4/3 but I have to mention never got that feeling of perfectly done lens. Unreal feeling at touching/focusing. I attached here a few picture for your enlightenment. Couldn't not to go back to the seller and buy it's twin 25 3.5 even I know I won't going to use it. Paid $90 for bought but it's one of the best investment ever done. Oh, I haven't got the adapter yet, just ordered one via eb*y, really look forward to use the 50 1.7 one.