My Contax 50 mm f1.4 Zeiss lens has run into a problem of oily aperture blades. The blades eventually remain stuck on wide open now. I know the only way to fix it is to take it apart and clean up the mess on the blades. I have repaired some Pentax lenses before. The first thing to do is always to unscrew the name ring around the front glass element on Pentax lenses. Once the name ring is unscrewed things are exposed and it becomes apparent what to unscrew next. I was able to repair an oily blades problem for a Pentax lens once. Well, the Contax Zeiss lens is different. The name ring is not removable. Under a magnifier I can see that it is actually a part of the front barrel. So I guess the front barrel can be unscrewed off. Does anyone ever repaire one and can confirm this? Or does anyone know the procedure of taking this lens apart for repairing/cleaning the aperture blades? I can't find any information about repairing Contax Zeiss lenses any where. This lens is one sharpest standard lens I ever owned. I am reluctant to give it up. Any information about repairing it is much appreciated.