@confusedcharlot @wxcafe@social.wxcafe.net uranium?
@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