I have read that there are only a handful of optical glass makers in the world.
I think Schott in Germany is the largest. Nikon makes their own and there are probably a couple more in Japan. Rochester New York used to have at least one, maybe more but I suspect there are not any there now.
Are you thinking of Kodak ?
Glass manufacturers are leaving us at an alarming rate. Glass is a classical industrial product and companies who have been around for over a century are now going out of business.
It’s quite sad. I hope we can rebuild someday.
I’m reminded of Waterbury CT. Once the center of _global_ manufacturing now it’s a dangerous, dangerous ghetto.
Gleasons made the lenses for Kodak Cameras in Rochester. Wartime aerial cameras were made there. All the movie reels of bombing were from there for a long time.
Kodak is so small I do not know about Gleasons...
Stromberg Carlson was there too...