Bought at St. Vinnies in The Dalles. Aperture looks good and is oil free. The auto focus is working now. I had to go in and clean the middle helicoil and grease it up. I think I got infinity focus pretty well. If not remove the front lens ring to access the six focus adjusting screws, loosen them and turn focus ring till infinity focus is clear, set at infinity and tighten screws.