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To clarify: the innovation isn't that they design better lenses. It's that given the first surface of a lens, they have an analytical formula for the lens's second surface so that the lens doesn't exhibit spherical aberration. Traditionally, numerical methods are used to compute this second surface instead of an analytical formula. Also, as a practical matter, designers often use several spherical lenses instead of a few aspherics because the latter are harder to manufacture/more expensive.



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