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Topic: Aberration in optical systems

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Lens (optics)

Spherical aberration

Focal ratio

Chromatic aberration

Eyepiece

Crown glass

Paraboloid of revolution

Depth of field

Hyperfocal distance

Cooke Triplet

Rayleigh criterion

Flint glass

Circle of confusion

Photographic lens

Diopter

Spherical aberration - Wikipedia, the free encyclopedia In optics, spherical aberration is an image imperfection that occurs due to the increased refraction of light rays that occurs when rays strike a lens or mirror near its edge, in comparison with those that strike nearer the center. In lens systems, the effect can be minimized using special combinations of convex and concave lenses, as well as using aspherical lenses. It is often considered to be an imperfection of telescopes and other instruments which makes their focusing less than ideal due to the spherical shape of lenses and mirrors. en.wikipedia.org /wiki/Spherical_aberration   (258 words)

Aberration in optical systems - Wikipedia, the free encyclopedia Aberration in optical systems (lenses, prisms, mirrors or series of them intended to produce a sharp image) generally leads to blurring of the image. In a similar manner, for systems used in photography, the vertex of the colour curve must be placed in the position of the maximum sensibility of the plates; this is generally supposed to be at G'; and to accomplish this the F and violet mercury lines are united. Spherical aberration and changes of the sine ratios are often represented graphically as functions of the aperture, in the same way as the deviations of two astigmatic image surfaces of the image plane of the axis point are represented as functions of the angles of the field of view. en.wikipedia.org /wiki/Aberration_in_optical_systems   (5768 words)

aberration --  Encyclopædia Britannica in optical systems, such as lenses and curved mirrors, the deviation of light rays through lenses, causing images of objects to be blurred. There are three basic types of optical telescopes: refractors that use lenses, reflectors that use mirrors, and catadioptrics that use a combination of both lenses and mirrors. Information on Shprintzen syndrome, caused by deletion of a segment in chromosome 22, and its characteristics--cleft palate, heart defects, facial aberrations, and learning and speech problems. www.britannica.com /eb/article-9003333   (769 words)

Nikon MicroscopyU: Infinity Optical Systems The situation is quite different for infinity-corrected optical systems where the objective produces a flux of parallel light wavetrains imaged at infinity (often referred to as infinity space; Figure 2(b)), which are brought into focus at the intermediate image plane by the tube lens. Another consideration is the objective pupil diameter, which also must be increased for optimum performance with low-magnification objectives in optical systems having long tube lens focal lengths. In a finite optical system of fixed tube length, light passing through the objective is directed toward the intermediate image plane (located at the front focal plane of the eyepiece) and converges at that point, undergoing constructive and destructive interference to produce an image (Figure 2(a)). www.microscopyu.com /articles/optics/cfintro.html   (2190 words)

Olympus Microscopy Resource Center: Anatomy of the Microscope - Focus Depth and Spherical Aberration - Interactive Java Tutorial Cross-sections taken along the optical axis of the microscope near the focal plane using a high numerical aperture objective with spherical aberration are illustrated in Figure 1. Instead, the wavefront is distorted and departs from ideal behavior in a manner that is dependent upon the nature of the aberration and/or image filters and conditions that are present in the optical system. Furthermore, distortion introduced by spherical aberration may not only affect image quality and fidelity, which affect interpretation and measurement of the specimen, but also the efficiency of confocal and other imaging modes in which the microscope optics are used to reduce the image to obtain a diffraction-limited illuminating point. www.olympusmicro.com /primer/java/aberrations/pointspreadaberration   (1297 words)

Mirror article - Mirror reflective plane parallel light mirror image parabolic concave - What-Means.com Note that spherical concave and convex mirrors do not have a single focal point, as often erroneously described in high school physics text books (see spherical aberration in Lens (optics) and Aberration in optical systems). The reflectivity of the mirror coating depends somewhat on the wavelength of light, and this is exploited in some optical work to make cold and hot mirrors. These are glass (or sometimes other material) substrates on which one or more layers of dielectric material are deposited, to form an optical coating. www.what-means.com /encyclopedia/Mirror   (907 words)

Aberration Invariant Optical/Digital Incoherent Optical Systems By optimum combination of optical pre-processing and digital post-processing, or optical coding and digital decoding of the image information, incoherent optical systems invariant to numerous aberrations can be formed. Systems that are invariant to misfocus are also invariant to chromatic aberration, astigmatism, thermal effects, and spherical aberration. The theory of aberration invariance can also be used with low-cost, low-precision optics to produce systems that image with the performance of high-cost, high-precision, or near diffraction-limited, spatial resolution. www.cdm-optics.com /wave/pubs/papers/overview/paper.html   (668 words)

A Glossary for Telescope Buyers and Users A marketing term for an optical system in which every optical surface where light passes from glass into air, or from air into glass, is coated with one of the newer, high-tech low-reflection coatings, which transmit more light than such earlier ones as magnesium fluoride. A marketing term for an optical system in which every optical surface where light passes from glass into air, or from air into glass, is coated with one of the early low-reflection coatings, almost certainly magnesium fluoride. Common Cassegrain systems include the Schmidt-Cassegrain, in which a corrector plate which appears flat to the unaided eye is mounted just skyward of the secondary mirror, and several varieties of Maksutov-Cassegrain, in which a correcting lens that resembles a thick watch glass is similarly mounted. observers.org /beginner/glossary.html   (11783 words)

Nikon MicroscopyU: Microscope Optical Systems Condenser Image Planes - In a microscope optical system, the lamp filament is imaged in the focal plane of the condenser aperture diaphragm when the microscope is configured to operate under conditions of Köhler illumination. Microscope Conjugate Field Planes - In a microscope optical system, the lamp filament is imaged in the focal plane of the condenser aperture diaphragm when the microscope is configured to operate under conditions of Köhler illumination. Perfect Two-Lens System Characteristics - During investigations of a point source of light that does not lie in the focal plane of a lens, it is often convenient to represent a perfect lens as a system composed of two individual lens elements. www.microscopyu.com /articles/optics/opticshome.html   (1867 words)

Aberration - Wikipedia, the free encyclopedia 4.2 Aberration in optical systems, see also the article on lenses. Aberration (Latin ab, from or away + errare, to wander), a deviation or wandering, especially used in the figurative sense as: 4.1 Aberration of light, also referred to as astronomical aberration or stellar aberration. en.wikipedia.org /wiki/Aberration   (126 words)

A to Z of Astronomy The optically visible galaxies are often giant elliptical galaxies with the radio emission coming from pairs of regions on either side and well outside the visible part of the galaxy. A system of coordinates for the positions of objects in the sky based upon the plane of the Milky Way Galaxy and the direction to the centre of the Galaxy in Sagittarius. Originally a clockwork mechanical model of the Solar System showing the planets moving around the Sun and sometimes the satellites around their parent planets. www.naasbeginners.freeuk.com /atoz.htm   (9581 words)

KTH Signals, Sensors and Systems :: (none) The main application areas of micromirror arrays are projection display systems, pattern generators in maskless lithography systems, optical scanners, printers, optical spectroscopy, aberration correction, adaptive optical systems and switches and cross connectors in optical communication systems. The torsional micromirror arrays have potential applications as spatial light modulators in projection display systems, in maskless lithography systems and in optical communication systems. Also, the achievable optical quality, the surface roughness and the uniformity of monocrystalline silicon surfaces is superior compared to most other surfaces. www.s3.kth.se /mst/research/projects/micromirrors/index.shtml   (431 words)

coma In optics, a coma is an optical aberration in an astronomical telescope which causes a V-shaped flare to the image of a star. In astronomy, a coma is the tail of a comet produced by vapor boiled off the comet as it nears the sun. da:Coma In medicine, a '''coma''' is a profound state of unconsciousness, which may result from a variety of conditions including intoxication (drug, alcohol or toxins), metabolic abnormalities (hypoglycemia, hyperglycemia, ketosis, etc.), central nervous system diseases, stroke, head trauma, seizures, and hypoxia. encyclopedia.mysleepcenter.com /coma.htm   (739 words)

Kevin's Page The small beam shear interferometer allows adjustment of focus, coma, astigmatism and spherical aberration in optical systems for laser beam sizes ranging from 2.5 to 8 mm. This instrument is well suited for fast alignment of optical elements in systems using laser diodes in research and manufacturing. The cube is inserted into the beam path of the optics system, and the wave-front quality can be checked directly or in reflection back from a mirror element or optical disk surface. www.optics.arizona.edu /Kevin   (401 words)

ISL - Aberation Invariant Imaging Aberration-invariant optical systems are combined optical/digital systems that produce near diffraction-limited images that are not affected by unknown or unmeasured lens aberrations. The benefit of aberration-invariant optical systems is that low-cost, low-quality opitcal systems can be modified through the addition of a special-purpose phase mask to image as a high-cost, high-quality system. The unknown aberrations could be due to deterministic design errors, such as spherical aberration, while the unmeasured errors, such as chromatic aberration, could be due to low-cost fabrication procedures or large swings in ambient operating temperature. www.colorado.edu /isl/research/aberration.html   (140 words)

Mirrors -- Effects-- Composition Mirrors are also sometimes used as part of security systems, so that a single video camera can show more than one angle at a time. optical work to make cold and hot mirrors. Rounded mirrors are sometimes placed at corners of places such as parking lots or stores, allowing people to see around corners to avoid crashing into other vehicles or shopping carts. www.edinformatics.com /inventions_inventors/mirror.htm   (1045 words)

Cooke Triplet It was the first lens system that allows elimination of most of the optical distortion or Aberration in optical systems at the outer edge of lenses. The Cooke triplet is a photographic lens design designed and patented in 1893 by Dennis Taylor who was employed as chief engineer by Cooke of York. A Cooke triplet comprises a negative flint glass element in the centre with a crown glass element on each side. read-and-go.hopto.org /Lenses-by-type/Cooke-Triplet.html   (292 words)

Optical Systems Any lens used in an optical system for polychromatic light should always be an achromat, designed for the particular object and image distances under which it is used. It is not satisfactory for the design of optical components of wide aperture or field, high power, or fidelity of imaging, for which accurate ray tracing and wave considerations are necessary. Chromatic aberration is caused by the differences in index for different wavelengths, or dispersion, and cannot be reduced at all. www.du.edu /~jcalvert/optics/optsys.htm   (3142 words)

RCOS :: Home Coma is an aberration common in all reflecting telescope systems. RC Optical Systems is owned and operated by Optical Systems Incorporated, an Arizona Corporation. RC Optical Systems selected the Ritchey-Chretien design for its wide coma free field of view. www.rcopticalsystems.com   (345 words)

Book List Index Aberrations of the Symmetrical Optical System Welford, Academic Systems and Transformations with Applications in Optics Papoulis, Robert E. Krieger Publishing Co. Electro-Optical System Design : For Information Processing Wyatt, www.opticsnotes.com /books.htm   (750 words)

Contact Lenses Chromatic or Colour Aberrati 1000 on In optical systems composed of lenses, the position, magnitude and errors of the image depend upon the refractive indices of the glass employed (see lens, and above, Monochromatic Aberration). Many people typically only use it for disinfection and storage, relying on other products for rinsing Fantastic system to save thousands of dollars on groceries every month. bonose.com /Contact+Lenses.html   (620 words)

aberration in optical systems - OneLook Dictionary Search Tip: Click on the first link on a line below to go directly to a page where "aberration in optical systems" is defined. We found one dictionary with English definitions that includes the word aberration in optical systems: aberration in optical systems - OneLook Dictionary Search www.onelook.com /?w=aberration+in+optical+systems   (85 words)

photonics, a, aberration in optical systems definition dictionary glossary Browse photonics a "aberration in optical systems" Product Areas Find Patents for photonics a "aberration in optical systems" Find Engineering Standards for photonics a "aberration in optical systems" www.globalspec.com /definition/Photonics/A/aberration_in_optical_systems   (158 words)

Olympus Microscopy Resource Center: Anatomy of the Microscope - Objective Magnification in Infinity Optical Systems: Interactive Java Tutorial Infinity-corrected microscope optical systems are designed to enable the insertion of auxiliary devices, such as vertical illuminators and intermediate tubes, into the optical pathway between the objective and eyepieces without introducing spherical aberration, requiring focus corrections, or creating other image problems. The situation is quite different for infinity-corrected optical systems where the objective produces a flux of parallel light wavetrains imaged at infinity (often referred to as infinity space, and labeled in the tutorial window), which are brought into focus at the intermediate image plane by the tube lens. The situation is quite different for infinity-corrected optical systems where the objective produces a flux of parallel light wavetrains imaged at infinity, which are brought into focus at the intermediate image plane by the tube lens. www.olympusmicro.com /primer/java/infinityoptics/magnification   (981 words)

Optical Design Software Overview Aberration coefficients are useful in optical design because they characterize the system in terms of its symmetries, because they allow the overall performance to be expressed as a sum of surface contributions, and because they are calculated quickly. The form in which aberrations are displayed depends on the program and the type of system under study, but as a general rule, for focal systems aberrations are displayed as equivalent ray displacements in the paraxial image plane. Systems that are limited primarily by geometrical aberrations are difficult to evaluate using physical optics, because the wavefront changes so much across the pupil that it is impossible to sample it sufficiently using a reasonable number of rays. www.sinopt.com /learning1/optsoft/evaluation/evaluation.htm   (3682 words)

Aberration in optical systems - Wikipedia, the free encyclopedia Aberration in optical systems (lenses, prisms, mirrors or series of them intended to produce a sharp image) generally leads to blurring of the image. Spherical aberration and changes of the sine ratios are often represented graphically as functions of the aperture, in the same way as the deviations of two astigmatic image surfaces of the image plane of the axis point are represented as functions of the angles of the field of view. The aberrations of the third order are: (1) aberration of the axis point; (2) aberration of points whose distance from the axis is very small, less than of the third order -- the deviation from the sine condition and coma here fall together in one class; (3) astigmatism; (4) curvature of the field; (5) distortion. en.wikipedia.org /wiki/Aberration_in_optical_systems   (5764 words)

Seidel vs. Zernike The Seidel aberrations were developed in the mid 19th century to account for the monochromatic geometrical aberrations of centered optical systems, i.e. The aberration polynomial coefficients can be found either from a series expansion of the law of refraction, or using an iteration procedure introduced by Buchdahl[4], which considers rotational invariants and builds upon low-order coefficients to develop the next higher-order coefficients. The magnitude of the aberrations is expressed in terms of an aberration polynomial. www.sinopt.com /learning1/desnotes/seizern.htm   (818 words)

Information: Telescopes Microscopes Night Vision Binoculars Digital Cameras Rifle Scopes Radar Guns, & more! aberration, optical  Errors in an optical system, lens or mirror, affecting the image.  The six types of aberration are astigmatism, chromatic, coma, distortion, field curvature and spherical. Modern optical systems can exceed this “theoretical design limit,” but it remains a standard.  No lens truly brings light to focus at a true point — there is always an airy disk.  If the optics can keep the focus point to the theoretical minimum of the airy disk, they are diffraction limited. infinity corrected optics In microscopy, an optical design in which the rays passing through the objective do not converge to form an image in the eyepiece without the assistance of additional optics in the drawtube.  As the rays remain parallel, they are said to continue to infinity. www.opticsplanet.com /info/glossary.shtml   (6231 words)

28353.000518&ELEMENT_SET=DECL The projection lens system of Claim 1 wherein the diffractive optical surface is formed on a diffractive optical element which comprises two optical surfaces, one of said optical surfaces being plano and the other of said optical surfaces being the diffractive optical surface. The projection lens system of Claim 1 wherein: (i) the projection lens system has an aperture stop and a focal length fo, and (ii) the distance between the diffractive optical surface and the aperture stop is less than 0.1*fo. A projection television system comprising three cathode ray tubes and three projection lens systems, one projection lens system being associated with each of the cathode ray tubes for projecting light from that tube onto a common screen to form an image, each projection lens system comprising the projection lens system of Claim 1. www.wipo.int /cgi-pct/guest/getbykey5?KEY=00/28353.000518&ELEMENT_SET=DECL   (3482 words)

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