Optical Glass Development

I want to ask how Schott and other glass makers develop their glasses for calibrated light transmittance ?

How everything goes ?

Is it a quantum physics science or a basic experimentation ?

For example , why Leica worked alone to develop its own glass formulas ?
For to make a reason to sell its optics 100 times more expensive than Japan ?
And why they stoped it ?
Or they didnt like zeiss glasses or they didnt want same colors with zeiss ?

There are lots of chaotic questions , please someone tell the reality .

Best ,

Mustafa Umut Sarac

Istanbul
 

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