Thank you for your kind message. I have decided not to sell the 85mm f/1.8D. Because there is a newer 85mm f/1.8 out, many of these are on the used market and the price has dropped. I did not use an extension tube, although that would work well. I used instead an older large Olympus close up lens ... very similar to Canon's 500 close up lens. That's just because I had it; no preference over the extension tube.