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.
The asphere's more complex surface profile can reduce or eliminate spherical aberration and also reduce other optical aberrations such as astigmatism, 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 sometimes cheaper than the multi-lens design.[1] Aspheric elements are used in the design of multi-element wide-angle and fast normal lenses to reduce aberrations. They are also used in combination with reflective elements (catadioptric systems) such as the aspherical Schmidt corrector plate used in the Schmidt cameras and the Schmidt–Cassegrain telescopes. Small molded aspheres are often used for collimating diode lasers.
Aspheric lenses are also sometimes used for eyeglasses. Aspheric eyeglass lenses allow for crisper vision than standard "best form" lenses, mostly when looking in other directions than the lens optical center. Moreover, the reduction of the magnification effect of a lens may help with prescriptions that have different powers in the 2 eyes (anisometropia). Not related to the optical quality, they may give a thinner lens, and also distort the viewer's eyes less as seen by other people, producing better aesthetic appearance.[2]
^"What do "aspheric" or "aspherical" mean?". Fuzhou Looklens Optics. Archived from the original on October 6, 2014. Retrieved June 15, 2012.
An asphericlens or asphere (often labeled ASPH on eye pieces) is a lens whose surface profiles are not portions of a sphere or cylinder. In photography...
individuals, whose lenses have a thick center. An atoric lens design refers to a lens with a more complex asphericlens design. An atoric lens design can address...
Aspherical may refer to: Aspherical space, a concept in topology Asphericallens, a type of lens assembly used in photography which contains an aspheric...
atoric lens (literally, non-toric lens). They are related to toric lenses in the same way that asphericlenses are related to spherical lenses. This is...
combining two or three lens elements. A single-element aplanatic lens is an asphericlens whose surfaces are surfaces of revolution of a cartesian oval....
Montreal". This was based on an arrangement of aspherical surfaces. The Carl Zeiss AG & Varilux lenses were the first PAL of modern design. Bernard Maitenaz...
anamorphic lenses. Asphericlenses have at least one surface that is neither spherical nor cylindrical. The more complicated shapes allow such lenses to form...
lens, used for very high negative (myopic) corrections. More aesthetic asphericlens designs are sometimes fitted. A film made of cylindrical lenses molded...
manufacturing of strongly asphericallens elements which are difficult or impossible to manufacture in glass, and which simplify or improve lens manufacturing and...
media related to Magnifying glasses. Asphericlens Binoculars Burning glass Dome magnifier Glasses Graphoscope Macro lens Optical microscope Optical telescope...
, "fast" lenses. In lens systems, aberrations can be minimized using combinations of convex and concave lenses, or by using asphericlenses or aplanatic...
plane is curved to reduce the impact of aberrations. Lens (optics) Doublet (lens) Asphericlens Operation of Simple Lens - University of Edinburgh v t e...
beads and lenses from rock crystal, with unworked pieces of crystal coexisting with partially finished beads and lenses. The lenses are bi-aspheric and two...
this lens includes a design for a lens with a 270° field of view. A 6.2 mm f/5.6 SAP fisheye was later produced in limited numbers with an aspherical surface...
lenses with fewer elements and lower size can be achieved by using asphericlenses in which the curved surfaces are not spherical, giving more degrees...
would generate chromatic aberration, and spherical aberration if the lens is not aspheric. More common configurations use three or more elements for achromatic...
and wide f/1.9 lens aperture for available-light photography. The lens, a newly designed, four-element lens incorporating one aspheric-shaped element...
manufacturing limitations. Parameters include surface profile types (spherical, aspheric, holographic, diffractive, etc.), as well as radius of curvature, distance...
younger than the designers of the S2." The viewfinder incorporates an asphericlens to minimize distortion and the illuminated framelines are displayed...
models, as well as featuring optics of higher quality, with many lenses containing aspherically ground, fluorite or ultra-low dispersion glass elements. Their...
are the simplest. Contact lenses can provide a wider field of vision and fewer artifacts than even double asphericlenses. Refractive surgery aims to...
special instructions to fabricating labs. In some cases, more aesthetic asphericlens designs can be fitted, reducing Scotoma associated with lenticulars...
of a spherical lens and the distance from its center. It is compensated by designing a multi-lens system or by using an asphericlens. Chromatic aberration...
maintains focus as the focal length changes (parfocal lens) Asphericallens with fast and large lens aperture Servomotor control of zoom, focus and aperture...
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