Re: [OM] How many manufacturers of optical glass are there?

[WKato]

I think lens engineers drool over glass catalogs the same way that I drool over 
the B&H catalog. There are many types of glass from many different 
manufacturers at differing cost. They plug the various properties of the glass 
into their computers and see if they can make a particular lens cost effective.

My humble guess...
Warren

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