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32. What is an "aspheric element"?




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This article is from the Photographic Lenses FAQ, by David Jacobson with numerous contributions by others.

32. What is an "aspheric element"?

It a lens element in which the radius of curvature varies slightly with angle off axis. Aspheric elements give the lens designer more degrees of freedom with which to correct aberrations. They are most often used in wide angle and zoom lenses.

 

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