Blurryeyed wrote:
Actually this lens does not have the Thorium element, it is the version prior to that particular lens, I have a couple of those here also as well as the Super Multi Coated versions which also has the same element. I used to put them on top of aluminium foil and leave them in the sun on sunny days. A couple of days of bright sunshine will clear the yellow out of those lenses...
i tried the foil and sunshine treatment on mine but with it being uk sunshine was in short supply. i ended up using a uv light for a loooong time. it did the job though.