I just read Kerry Thalmann's article on Caltar lenses in View Camera. In it, he mentions "Schneideritis," a problem with black paint on lens elements in some Schneider lenses. I did some web research and found very little information on it. I'm really interested in any informed comments on the following questions: o) What does it look like? o) How might it affect image quality? o) Is it worth fixing? Thanks in advance!