I have the 135mm and the tubes. The tubes are not everything I dreamed of, but neither is the 135mm. I've only used the tubes a couple of times, but they are not full auto with the P67II. With the lens alone, I can only get to 2.4feet. At that point, the width of the field is about 6.5 to 7 inches. Certainly not 1:1. I don't know about the 120mm macro. I'm considering using a diopter lens instead of the tubes. I don't know how close these get or what the options are or if Pentax diopters are better than anyone else's. Maybe someone else knows.