Hi! It's one of my first posts here but not the funniest I guess… I'm not especially talking about a magic C-lens in particular here but about a very underestimated question: radioactive lenses! One of my friends is a fireman captain and introduced me yesterday to one of his colleagues specialized in technological risks and chemical dangers (at Poissy, France : they're known to have very great equipments.) We made 3 different tests on all my Russian lenses which are all OK excepted the Mami