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aspherical surface

A lens surface with more than one radius of curvature (i.e., the surface does not form part of a sphere). The aspherical elements of a lens help compensate for many lens aberrations common in simpler lens designs. Aspherical elements are particularly important for wide-angle lenses, since they are prone to distortion.

See "A Quick Guide to Digital Cameras" in the Quick Reference section of Webopedia.
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