Dirk, AFAIK the Olympic Nikkor doesn't contain any radioactive glass. When comparing them side by side, there are clearly some minor external differences between the Olympic Nikkor and Millennium Nikkor, but Nikon has never published the optical formulas of either lens so we can only speculate about the glass. The Olympic Nikkor first appeared sometime in 1962 mounted on some of the first batch of "reissue" Nikon SPs (about 2000 cameras with serial numbers that start with 623xxxx) released around the same time. The F-mount Nikkor-S 50mm F1.4 was released in January 1962, so its a fair guess that the F-mount version and the new S-mount version were designed at the same time and are optically similar. The Olympic Nikkor has a magenta colored coating on the glass, and is not known to get the amber color typically associated with optical glass that contains lanthanum.