@confusedcharlot @wxcafe@social.wxcafe.net ah, there's also leaded glass, so maybe that
@confusedcharlot @wxcafe@social.wxcafe.net lead crystal has higher refractive properties than regular glass so I bet it's great in cameras https://en.wikipedia.org/wiki/Lead_glass
@noiob @wxcafe@social.wxcafe.net it could be lanthanum too. it's more abundant than lead
@noiob @confusedcharlot @wxcafe they used thorium glass elements in older lenses because it was cheaper
@MochiWaifu @confusedcharlot @wxcafe@social.wxcafe.net oh fun
@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
@confusedcharlot @wxcafe@social.wxcafe.net uranium glass glows under UV light so that wouldn't be great for a lens