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.
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.
Source: Wikipedia "Aspheric lens" · CC BY-SA 4.0
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