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An aspheric biconvex lens. 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.
Schmidt corrector plates work because they are aspheric lenses with spherical aberration that is equal to but opposite of the spherical primary mirrors they are placed in front of. They are placed at the center of curvature "C" of the mirrors for a pure Schmidt camera and just behind the prime focus for a Schmidt–Cassegrain. The Schmidt ...
In lens systems, aberrations can be minimized using combinations of convex and concave lenses, or by using aspheric lenses or aplanatic lenses. Lens systems with aberration correction are usually designed by numerical ray tracing. For simple designs, one can sometimes analytically calculate parameters that minimize spherical aberration.
The Canon FD 55mm ƒ/1.2 AL is a camera lens made by Canon, first introduced alongside the Canon F-1 single-lens reflex camera in March 1971. It was the first lens for any 35mm SLR system to incorporate an aspherical element. [1] The lens was manufactured until 1980.
The sequence of lens designations may differ in literature. See also full list of Nikon designations, Sigma designations, Tamron designations and Tokina designations.. Nikon AF-S/Sigma HSM/Tamron USD or PZD: The lens contains an integrated ultrasonic focus motor based on piezoelectricity, which enables quiet or low noise autofocus operation.
A lens is a transmissive optical device that focuses or disperses a light beam by means of refraction. A simple lens consists of a single ... An aspheric biconvex lens.