Aspherical lens
A curved lens with a non-spherical surface. Used to decrease aberrations and permit a more compressed lens size.
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Aspherical Lenses
Aspherical lenses are lenses with complex curved surfaces, such as where the radius of curvature changes according to distance from the optical axis.
Aspherical lens
Techniques Glossary Aspherical lens
A lens element that doesn't form part of a sphere. This is physically difficult to manufacture as most grinding/polishing equipment operates with a spherical action.
Aspherical Lens: A lens designed to reproduce images better by having its edges flattened so that it is not a perfect sphere, hence: "a" (not) "spherical" (a sphere).
Aspherical Lens - A lens whose edges have been flattened so that it is not a perfect sphere, produces a superior image.
Automatic Exposure - The camera automatically adjusts the aperture or shutter speed or both for the proper exposure.
Aspherical lens
A lens whose curved surface does not conform to the shape of a sphere; lenses are usually ground or molded with spherical surfaces; ...
Aspherical Lens
This type of lens is not a symmetrical column or tube. The edges are flattened, which creates a much better image than a standard lens shape.
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An Aspherical lens surface possesses more than one radius of curvature, which allows for the correction of lens aberrations common in simpler lens designs.
ASP - Aspherical Lenses. Lenses with this designation indicates that the lens uses at least one aspheric element. Usually, these lenses have a reduced number of component lenses and a compact size (although not necessarily), and improved performance.
The gain of quality by using hybrid lenses seems to be quite limited while lenses with true ground aspherical lenses often produce outstanding results, molded aspericals are in between quality-wise.
Schneider lenses of particular note include the Super-Symmar XL series with their aspherical lens elements. The 110mm f/5.6 Super-Symmar XL lens is extremely popular, and often listed as a "favorite" lens in many a photographer's arsenal.
8 Leica DG Macro-Elmarit Aspherical Lens Mega O.I.S. ($670)
Billed as the world's first Leica lens for Micro Four Thirds, the Panasonic/Leica 45mm f/2.
However, with modern manufacturing techniques the extra cost of manufacturing aspherical lenses is decreasing, and small aspherical lenses can now be made by molding, allowing their use in inexpensive consumer cameras.
In conjunction with (and ideally suited for) the M8, Leica has also announced the Tri Elmar M 16-18-21 mm F4 Aspherical lens.
Generally, an aspherical lens deviates slightly from an exactly spherical shape, and is relatively free from aberrations.
One hybrid aspherical lens and two glass mold elements give excellent correction for distortion and astigmatism. Incorporating an inner focusing system, the lens produces high-definition images throughout the entire zoom range.
Nikon introduced the first photographic lens with aspherical lens elements in 1968. Allows for more compact wide angle lenses, lighter and better performing than others with only spherical elements.
"I came across the Sigma 28-300mm f/3.5-6.3 DG IF Macro Aspherical Lens for Canon SLR Cameras, what is your opinion of this lens I have seen mixed reviews?" ...
With two extra-low dispersion glass elements and three aspherical lens elements, the lens delivers high-resolution, high-contrast images while minimising chromatic aberration. Ideally suited for use on Nikon DX-format and FX-format cameras.
Such an aspherical lens element can help simplify lens design by minimizing the number of elements required and can result in a sharper image. Aspherical elements are particularly useful for correcting distortion in wide-angle lenses.
6 uses SLD and aspherical lenses for producing sharp images with internal focusing. Lens is very light weight and compact. It weighs 18 oz and is 3.5 inches long. Sigma's 28-300mm version also uses SLD and aspherical glass.
 See also: Aspherical, Image, Light, Camera, Lens
  
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