Aspherical lenses offer better correction for many common lens aberrations than regular spherical lenses. Lenses with a spherical profile are easier to grind into the correct shape, but aspherical lenses have a more complex profile that’s more difficult and more expensive to make. Many modern lenses use molded aspherical elements instead to get round this. Lenses with aspherical elements in their design command a higher price and generally give better results.
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