@wxcafe@social.wxcafe.net what did they put in the glass?

@confusedcharlot @wxcafe@social.wxcafe.net ah, there's also leaded glass, so maybe that

@confusedcharlot @wxcafe@social.wxcafe.net uranium glass glows under UV light so that wouldn't be great for a lens

@noiob @confusedcharlot @wxcafe they used thorium glass elements in older lenses because it was cheaper

@MochiWaifu @confusedcharlot @wxcafe@social.wxcafe.net yeah that one also has a higher refractive index, so that'd make the lens lighter as well

@MochiWaifu @confusedcharlot @wxcafe@social.wxcafe.net apparently it can get discolored over time from radioactive decay

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