Spherical aberration This is the distortion to the view, seen through a telescope. It is due to the lenses being inappropriate for the design of telescope.
Spherical Aberration
A problem where a lens or mirror in a telescope is not shaped correctly, so the light from the center is focused at a different location than the light from the edges. You should never have to worry about this.
Spherical Aberration An optical aberration in which light from different parts of a mirror or lens is brought to different foci.
Superior Conjunction The conjunction of Venus and Mercury when they are more distant than the Sun. (See diagram.) ...
SPHERICAL ABERRATION
A fault in the image produced by an optical instrument in which the light rays towards the edge of a light beam passing through the instrument come to a focus at a different point from those near the centre of the beam.
Spherical aberration is an optical defect of a lens or mirror caused by its rounded shape. Spherical lenses and mirrors produce a distorted (blurry) image.
Spherical aberration in lenses ...
Spherical aberration - A common form of optical aberration caused when the light from the periphery of a mirror or lens doesn't have the same focal point as light from the center.
After the spherical aberration was corrected during Space Shuttle mission STS-61 in 1993, the now excellent imaging capabilities of the telescope were used to study increasingly distant and faint galaxies.
The Hubble's spherical aberration spread a star's light out into a fuzzy halo four arc seconds across.
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392. Spherical Aberration
An image distortion caused by a telescope mirror failing to be exactly parabolic.
spherical aberration a defect seen in images that is caused by the objective not being exactly shaped (e.g., an objective mirror not being exactly parabolic) so that not all of the light is focussed to the same point.
In optics, a specific deviation from perfect imagery, as, for example: spherical aberration, coma, astigmatism, curvature of field, and distortion.
Spherical Aberration always occurs with rays that are distant from the axis and incident on a spherical mirror or lens. It is the cause of the caustic curve. Spherical aberration is corrected by using parabolic reflecting and refracting surfaces.
On the 25th of June, a spherical aberration is discovered on Hubble's main mirror. Hubble still produces incredible images. Shortly after, COSTAR an optical correction system designed to compensate for the fault in Hubble's main mirror is approved.
A Maksutov-Cassegrain telescope (MCT) is a wide-angle reflecting telescope with a curved correcting lens (called a Meniscus Corrector Shell.) that minimizes spherical aberration and a concave mirror that receives light and focuses an image.
Spherical aberration and coma are eliminated in two mirror Ritchey Chretien designs.
The best image plane is in general curved, which may not correspond to the detector's shape and leads to a focus error across the field.
An Anastigmat or anastigmatic lens is a photographic lens completely corrected for spherical aberration, coma , and astigmatism. Early lenses often included the word Anastigmat in their name to advertise this new feature ....
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A catadioptric reflecting telescope similar to a Schmidt, except that it employs a deeply curved full-aperture lens called a meniscus to correct for spherical aberration.
anastigmat(ic)
An optical system, with at least three elements, which is completely corrected for spherical aberration, coma, and astigmatism.
Related category
- OPTICS AND OPTICAL PHENOMENA ...
This optical flaw (known as spherical aberration) meant that HST was not as sensitive as designed, although it could still see many objects in the universe with unprecedented resolution. In late 1993, astronauts aboard the ...
Deconvolution - Deconvolution is a process that attempts to remove the effects of convolution. For example, deconvolution was used to attempt to restore the aberrated images in the Hubble Space Telescope that were caused by spherical aberration.
A parabolic surface, obtained by rotating a parabola about its own axis, is much used for mirrors as it has the property of focusing parallel rays of light to a point focus without spherical aberration.
This idea was actually employed in a telescope constructed by the German Jesuit astronomer Christoph Scheiner (1579?-1650) in about 1630. Because of the difficulties caused by spherical aberration, ...
A correcting plate (a lens) was added in 1930 by the Estonian astronomer and lens-maker Bernard Schmidt (1879-1935), creating the which minimized the spherical aberration of the Cassegrain telescope.
 See also: Telescope, Light, Focus, Field, Diameter
  
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