JOHN CAPPAI , Oct 20, 1997; 09:58 a.m.
MC standts for multi coated. There are two verions of Bronica lenses for the ETR system : The E and the current PE. Usally MC are called the early lenses having a silver ring on the front where you thread the filter. The EII lenses are newer versions, before PE, of old E lenses. The two I know are the 75 and the 500. The big difference betwwen E and PE is that the latest are constructed under the MTF theory, providing better optical performance. I think that the only mechanical improvment, except the modern finish, is the step between f stops.