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An aspheric lens or asphere (often labeled ASPH on eye pieces) 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 .
Kodak (Disc) aspheric 12.5mm f/2.8 Kodak Ektar 25mm f/1.9. Typical lens elements have spherically curved surfaces. However, this causes off-axis light to be focused closer to the lens than axial rays (spherical aberration); especially severe in wide angle or wide aperture lenses. This can be prevented by using elements with convoluted aspheric ...
Aspherical lens, a type of lens assembly used in photography which contains an aspheric lens, sometimes referred to as ASPH Topics referred to by the same term This disambiguation page lists articles associated with the title Aspherical .
Radius of curvature (ROC) has specific meaning and sign convention in optical design. A spherical lens or mirror surface has a center of curvature located either along or decentered from the system local optical axis. The vertex of the lens surface is located on the local optical axis.
Spherical aberration can be eliminated by making lenses with an aspheric surface. Descartes showed that lenses whose surfaces are well-chosen Cartesian ovals (revolved around the central symmetry axis) can perfectly image light from a point on the axis or from infinity in the direction of the axis. Such a design yields completely aberration ...
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The ECE regulations in use throughout most of the world except North America permit the driver-side mirror to have a planar, convex, or aspheric surface; an aspheric section is often combined with a larger convex section, and the two sections are separated by a visible line to alert the driver to the two sections' different perspective shifts ...