Aspheric lens

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Science and technology

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What Wikipedia says

An aspheric lens or asphere (often labeled ASPH on eyepieces) is a lens whose surface profiles are not portions of a sphere or cylinder. In photography, a lens assembly that includes an aspheric element is often called an aspherical lens.

Excerpt from the Wikipedia article “Aspheric lens”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: No machine-readable author provided. ArtMechanic assumed (based on copyright claims)., CC BY-SA 3.0, via Wikimedia Commons.