I finally found a 21 f/3.4 Super Angulon. I was testing it on Saturday without a UV/IR filter and noticed some magenta (in landscape photos) in the center and the edges. I have a UV/IR filter on the way and had arranged for the flange to be sent to JM. I started thinking about the fall-off/vignette pattern of the SA and I'm not sure if coding it as an elmarit or WATE will not just complicate the issue. Can anyone with a SA give me some guidance?