Everyone who sells a Summicron or Summilux regrets it sooner or later.... There is something about wide aperture Leitz lenses that appeals to the soul. If left to mature, this disease spreads to Summitars and Xenons and the next thing you know you are craving Thambars. Then large format hits and you want Cookes and Petzvals. I have seen this syndrome in my medical practice and there is no cure, but there is GAS therapy