This may explain why you can spend thousands of dollars on one lens. (Optical glass can cost $1000 a Kg!)
Being a Canon user, here are some Canon videos that show how the glass is made too (using a ‘temperature gradient type continuous slow cooling furnace’ - try saying that too quickly)
Part 2 and 3 of Lens video after the break and a Canon 30 fps set up for a baseball game
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