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This is a thing in vintage lenses: https://camerapedia.fandom.com/wiki/Radioactive_lenses https://camerapedia.fandom.com/wiki/Radioactive_lenses I own a Super

This is a thing in vintage lenses: https://camerapedia.fandom.com/wiki/Radioactive_lenses https://camerapedia.fandom.com/wiki/Radioactive_lenses I own a Super-Multi-Coated Takumar 50mm f/1.4 and can confirm that the glass browns with age. UV exposure (sunlight) does clear it some.

dheera 3y ago
Yep, I have a couple thoriated lenses, it sucks that people downvote an actually relevant comment without understanding.