Well, I went a little bit off the wall and bought a Rodenstock 300mm f5.6 Macro-Sironar-N. with reversing elements. I have one of the in a 210 and it's a really nice, very sharp lens. This 300 has a 550mm image circle at f22 but the angle of coverage is 50 degrees so it'll have it's own look. I'll report as soon as I have it..EC