Some manufacturers, like especially Asahi Pentax, were even known for using radioactive lens components like thorium.In days gone by Canon made many L lenses with leaded glass elements. The 200/1.8L used them, as did the original EF 85/1.2L (not the second version.) The EF 50/1L too. Many of the early top end L lenses did. It's what gave them that magical look that many of them are famous for. Canon stopped using leaded glass when it was banned in the EU.
Unfortunately something about those leaded glass elements made them subject to haze. Sometimes it could be removed with a lens disassembly and careful cleaning but other times not. I cannot begin to count the number of lenses like this I sent to Canon Japan for cleaning when I was a dealer.
So yes, it does matter what lens elements are made of and decisions that seemed great at the time (and may have actually been great at the time!) can have bad consequences in the future.
So, it indeed matters what lenses are made of!
Edit: I think Canon's FL 1,2/58mm was also radioactive.
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