I compared a Apo Symmar 120/5.6 with a Rodenstock Sironar-S 150/5.6 and found be tter contrast transfer for the Sironar-S. I would like to compare the MTF data f or these lenses. Where can I find these data?. For the same reason, I would hav e MTF data for teh Symmar-S 210/5.6 and the APO sironar-S 210/5,6. Who knows where to find these data?