Aspherical Lens
A lens whose edges have been flattened so that it is not a perfect sphere, produces a superior image. | ||||
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Aspherical Lens Definition from Encyclopedia Dictionaries & Glossaries
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Aspheric lens
An aspheric lens or asphere is a lens whose surfaces have a profile that is neither a portion of a sphere nor of a circular cylinder. In photography, a lens assembly that includes an aspheric element is often called an aspherical lens.
The asphere's more complex surface profile can eliminate spherical aberration and reduce other optical aberrations compared to a simple lens. A single aspheric lens can often replace a much more complex multi-lens system. The resulting device is smaller and lighter, and possibly cheaper than the multi-lens design.
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