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My 50mm F1.4 had the yellowing from the thorium element but I followed someone's advice to let it sit under a $10 LED light available from Ikea and after a few days the yellow is gone. Hoping to get some shots with it's "new" look.Interesting, because I was just looking at some Takumar footage the other day, and I have to say it looks darn close to a Cooke.
I will see if I can post it.