I went outside and reset the focus stops so they matched the reading for infinity on the scale, and then adjusted the focus at the other end of the scale for minimum distance (as far as the scale was concerned). On the 135mm scale it was 3.5', and with the 150mm lens it was 4.5'. Then I focused at the distances I wanted to mark. I tried it out with some Polaroid, and was pleasantly surprised to have really good luck getting properly focused even at close distances like 6' and 4.5'. I'm psyched. Now I just need a 10 lb. barbell to start working out my left wrist.