Quote Originally Posted by benjiboy View Post
I suggest you read this thread http://nortega.com/fastest-tool-to-c...horium-lenses/ I cleared the yellow caste in my canon FD 35mm f2 Thorium lens with one of these in about thirty hours http://www.ikea.com/us/en/catalog/products/20169658/ you can point it right down into the lens and it removed the yellow tinge like magic and because it's L.E.D and they produce U.V light but it produces very little heat, my lens is now completely clear, and it's also a very useful work light.
I got two lenses a M-42 50 f1.4 and an early 35 F2 FD lens that need the UV treatment, the desk lamp looks to be the most effective solution. I got too much shade around my house.