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	Imatest - Chromatic aberration
		The visibility of the chromatic aberration is proportional to the
		To deal with these issues Chromatic aberration is measured in percentage of the distance from the image center to the corner (percentage of sensor diagonal/2), corrected for the angle of the ROI with respect to the center.
		Because Chromatic Aberration cannot be measured accurately near the image center, the chart is rendered in pale colors with the Region of Interest (ROI) is less than 30% of the distance from the center to the corner.
	www.imatest.com /docs/sfr_chromatic.html (937 words)

	AllRefer.com - aberration (Physics) - Encyclopedia
		Spherical aberration is caused by the failure of a lens or mirror of spherical section to bring parallel rays of light to a single focus.
		Spherical aberration can be prevented by using a parabolic rather than a spherical section, but this involves much greater complexity and expense in lens or mirror construction.
		Chromatic aberration results in the blurred coloring of the edge of an image when white light is sent through a lens.
	reference.allrefer.com /encyclopedia/A/aberrati.html (301 words)

	Chromatic aberration - Wikipedia, the free encyclopedia
		Chromatic aberration is caused by the dispersion of the lens material, the variation of its refractive index n with the wavelength of light.
		Chromatic aberration of a lens is seen as "fringes" of color around the image, because each color in the optical spectrum cannot be focused at a single common point on the optical axis.
		Chromatic aberration can be further minimized by using an achromatic doublet or achromat in which two materials with differing dispersion are bonded together to form a single lens.
	en.wikipedia.org /wiki/Chromatic_aberration (281 words)

	Aberration
		The annual aberration is the aberration correction for an imaginary observer at the Earth's centre.
		Note that this sort of aberration is different from the planetary aberration, which is the apparent displacement of a solar-system body, with respect to the ephemeris position, as a consequence of the motion of both the Earth and the source.
		The planetary aberration can be computed either by correcting the position of the solar-system body for light-time, followed by the ordinary stellar aberration correction, or more directly by expressing the position and velocity of the source in the observer's frame and correcting for light-time alone.
	www.hartrao.ac.za /nccsdoc/slalib/sun67.htx/node209.html (465 words)

	Aberration in optical systems - Education - Information - Educational Resources - Encyclopedia - Music
		Aberration in optical systems (lenses, prisms, mirrors or series of them intended to produce a sharp image) generally leads to blurring of the image.
		The preceding review of the several errors of reproduction belongs to the Abbe theory of aberrations, in which definite aberrations are discussed separately; it is well suited to practical needs, for in the construction of an optical instrument certain errors are sought to be eliminated, the selection of which is justified by experience.
		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) rawwiki_inboundvature of the field; (5) distortion.
	www.music.us /education/A/Aberration-in-optical-systems.htm (5755 words)

	Canon BCTV Lenses: What is Chromatic Aberration?
		There are two types of chromatic aberration: longitudinal aberration, which corresponds to the tracking error, and lateral aberration, which corresponds to the registration error.
		In fig focal length is plotted on the horizontal axis and on-axis chromatic aberration on the vertical axis.
		In Fig focal length is plotted on the horizontal axis and lateral chromatic aberration on the vertical axis.
	www.canon.com /bctv/faq/chrab.html (351 words)

	Chromatic aberrations
		The chromatic aberration is particularly manifest in wideangle lenses of the retrofocus type and with older-generation tele lenses.
		The aberration does no visual damage to areas with a uniform color or brightness; the archetypal manifestation is color fringing along boundaries that separate dark and bright parts of the image.
		Spherical aberration and LCA are independent of the position of the aperture stop, but their adverse effect on the image quality is reduced upon stopping down the lens.
	www.vanwalree.com /optics/chromatic.html (2263 words)

	Eliminating color fringing (lateral chromatic aberration)
		Longitudinal chromatic aberration is the change of the lens's point of focus for different wavelengths.
		Lateral chromatic aberration is the change in a lens's magnification for different wavelengths, resulting in color fringing.
		It tends to be worst in highly asymmetric lenses, particularly in retrofocus ultrawides (<24mm in the 35mm format), where the rear element may be further from the film than the focal length, and in true telephotos (>200mm in the 35mm format), which may be shorter than the focal length.
	www.normankoren.com /Tutorials/Chromatic.html (1034 words)

	Chromatic Aberration
		One way to minimize this aberration is to use glasses of different dispersion in a doublet or other combination.
		The idea is to use a lens pair with the strongest lens of low dispersion coupled with a weaker one of high dispersion calculated to match the focal lengths for two chosen wavelengths.
		Another approach to chromatic aberration reduction is to use two positive lenses separated by one half the sum of their wavelengths.
	hyperphysics.phy-astr.gsu.edu /hbase/geoopt/aber2.html (297 words)

	Nikon MicroscopyU: Interactive Java Tutorials - Chromatic Aberration
		Chromatic aberrations are wavelength-dependent artifacts that occur because the refractive index of every optical glass formulation varies with wavelength.
		It is relatively simple to demonstrate chromatic aberration using a thick, simple converging (biconvex, positive meniscus, or plano-convex) lens illuminated with a polychromatic point source, such as a flashlight or candle.
		Lateral chromatic aberration is greater for objectives of short focal length and can range from 1.1 to 1.9 percent of the radial distance from the optic axis.
	www.microscopyu.com /tutorials/java/aberrations/chromatic (1967 words)

	Aberration (Site not responding. Last check: 2007-09-20)
		The Aberration trading system was developed in 1986 by Keith Fitschen, a retired Air Force pilot with 20 years of system development experience, to trade a large basket of commodities.
		Aberration uses one equation and one entry and exit rule for all 57 commodities.
		Aberration can also be combined with other systems created by Keith Fitschen, such as I-Master.
	www.castletrading.com /html/system_trading/aberration.htm (245 words)

	aberration on Encyclopedia.com
		Laser ablation responsible for high increase in aberrations: corneal flap induces minimal change, but after laser treatment, the increase is from 40% to 60%.
		Selecting [2.sup.m-p] designs using a minimum aberration criterion when some two-factor interactions are important.
		Electron microscopes stand corrected: correction for the spherical aberration of lenses in electron microscopes is allowing scientists to push the resolution into the sub-angstrom range, opening the doors to new...
	www.encyclopedia.com /html/a1/aberrati.asp (728 words)

	aberration -- Encyclopædia Britannica
		Chromatic aberration is present when the lens forms imagesby different-coloured light in different planes and at different scales.
		Spherical aberration is present when the outer parts of a lens do not bring light rays into the same focus as...
		The change of image distance with wavelength is known as chromatic aberration, and the variation of magnification with wavelength is known as...
	www.britannica.com /eb/article-9003333 (769 words)

	Stellar Aberration and Einstein's Relativity (Site not responding. Last check: 2007-09-20)
		Stellar aberration is explained by the relative motion between a star and an observer on earth.
		It is shown that the description of stellar aberration, in terms of relative transverse velocity between the star and an observer on earth should be corrected, because it is an erroneous interpretation of Einstein's relativity.
		Stellar aberration is a correction, which is absolutely needed, in order to get a logical system of coordinates for stars and galaxies, which is valid at any time all year round and even at any epoch.
	www.newtonphysics.on.ca /Aberration/Aberration.html (2988 words)

	APPARENT LACK OF SYMMETRY IN STELLAR
		The effect of stellar aberration seems to be one of the simplest phenomena in astronomical observations.
		Aberration can also be derived from relativistic composition law of velocities which when applied in moving frame of source, using inverse Lorentz Transformations, predicts an aberration effect produced by the motion of the source in rest frame as discussed below.
		This lack of observational confirmation of active aberration was interpreted as an error in the theory of relativity and as a hint that the latter had to be revised accordingly [2-5].
	www.rajandogra.freeservers.com (2794 words)

	The Physics Classroom
		Aberration - a departure from the expected or proper course.
		There is an intrinsic defect with any mirror which takes on the shape of a sphere; this defect prohibits the mirror from focusing light to a precise point.
		Spherical aberration is most commonly corrected by use of a mirror with a different shape.
	www.physicsclassroom.com /Class/refln/U13L3g.html (394 words)

	C-ship: The Aberration of Light
		Unlike the Lorentz contraction or the dilation of time, which are purely relativistic effects with no counterparts in classical (Newtonian) physics, the aberration of light is predicted by classical physics and was first demonstrated in 1725, two years before Newton's death.
		In classical physics, the aberration of light is precisely like the aberration of rain we've just experienced; the only difference is that light travels considerably faster than rain, about 18 million times faster, as a matter of fact.
		At a quarter of the speed of light, Newton is still firmly in charge; aberration is behaving linearly, and the contribution of special relativity is less than a quarter of a degree of the total aberration of more than 11°.
	www.fourmilab.ch /cship/aberration.html (1881 words)

	Indina Eye Seidel Aberration Values
		longitudinal spherical aberration should be proportional to the square of ray height and the constant of proportionality is called the Seidel value for primary spherical aberration.
		Experimental measurements of aberration (in diopters) for subject DA are shown by symbols.
		Notice that this aberration function, like many of those in the classical literature, is asymmetric about the origin (the intersection of the foveal achromatic axis with the pupil plane).
	research.opt.indiana.edu /Library/INEye/INeyeSidel.html (1444 words)

	Melles Griot Optics Guide - Aberration Balancing (Site not responding. Last check: 2007-09-20)
		The contribution to longitudinal spherical aberration (LSA) for a lens is the -factor multiplied by the focal length and divided by the square of the f-number.
		Since the sign of the aberration is the same as focal length, to null out the effects of spherical aberrations the system requires both positive and negative focal length elements.
		To make the magnitude of aberration contributions of the two elements equal so they will cancel out, and thus correct the system, select the focal length of the positive element to be 3.93 times that of the negative element.
	www.mellesgriot.com /products/optics/fo_4_2.htm (441 words)

	Aberration - Wikipedia, the free encyclopedia
		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.
		4.2 Aberration in optical systems, see also the article on lenses.
	en.wikipedia.org /wiki/Aberration (126 words)

	Aberration Trading System - an Attain Capital Management recommended trading system
		The Aberration trading system was developed in 1986 by Keith Fitschen of Trade-System, Inc. to trade a basket of commodities, and is quite simply the best performing commodity trading system of all time.
		Aberration will pinpoint these, and the profits from those trades will more than offset the losses from the other groups.
		Aberration is a trend-following methodology that works across the commodity groups.
	www.attaincapital.com /t1-aberration.htm (426 words)

	Ultrasonic Wavefront Coherence in the Presence of Aberration (Site not responding. Last check: 2007-09-20)
		For the aberration path, data were acquired with and without using aberration correction on transmit.
		The coherence obtained through an aberrating path using geometric focusing on transmit was not improved by aberration correction on receive.
		Conclusions: The coherence of scattering is significantly decreased by aberration and restoration of coherence requires compensation of aberration on transmit as well as on receive.
	www.ljbdev.com /aium2000abs.html (286 words)

	aberration -- Britannica Concise Encyclopedia - Your gateway to all Britannica has to offer!
		Deviation of light rays by lenses or curved mirrors which causes the images to be blurred.
		Spherical aberration occurs because curvature in a lens or mirror causes rays falling on the outer edges to be brought to a focus at a different point than those falling on the middle.
		Chromatic aberration, which occurs in lenses but not mirrors, is the failure of a lens to focus all colours (wavelengths) of light in the same plane; the image appears blurred and shows rainbow-coloured fringes around the edges.
	concise.britannica.com /ebc/article-9354406?tocId=9354406 (747 words)

	LaserMyEye :: Encyclopedia :: Spherical aberration
		Specific type of wavefront aberration associated with reduced vision quality, especially night vision disturbances (starbursts and haloes) and reduced contrast sensitivity.
		Laser eye surgery for myopes is generally thought to cause spherical aberration in some amount.
		Spherical aberration is most commonly associated with reduced vision quality in dim light, including reduction in contrast sensitivity and the appearance of point light source vision disturbances (starbursts, haloes).
	www.lasermyeye.org /encyclopedia/sphericalab.html (137 words)

	Spherical Aberration (Site not responding. Last check: 2007-09-20)
		For a single lens, spherical aberration can be minimized by bending the lens into its best form.
		Although spherical aberration cannot be eliminated for a single lens, it can be minimized by the appropriate bending of the lens into its best form.
		The higher the index n, the smaller the aberration for the optimum shape.
	hyperphysics.phy-astr.gsu.edu /hbase/geoopt/aber.html (154 words)

	rft's photography / Tips & Tricks / Correcting Chromatic Aberration of Digital Cameras (Site not responding. Last check: 2007-09-20)
		Chromatic aberration is a deficiency of the lens that results in colour fringes that are only present on the peripheral parts of a photo.
		Another clear indication of chromatic aberration is, that the coloured fringes only appear on non-radial edges and their colour depends on the orientation with respect to the center.
		Obviously a correction of chromatic aberration after the colour interpolation has been performed in the camera can never be as good as a possible correction before colour interpolation has taken place.
	ray.cg.tuwien.ac.at /rft/Photography/TipsAndTricks/Aberration (1757 words)

	TradeSystem, Inc.
		Aberration went ten years without a losing year on any of it's portfolios, but in 2003 Aberration did not turn a profit.
		That equity curve is a direct parallel to Aberration trading it's Starter Portfolio of corn, live cattle, cotton, sugar, palladium, crude oil, dollar index, and 10-year notes while taking trades with $3,000 or less of risk.
		From about the middle of 1987 through the start of 1990, Aberration made only $5,000 or $6,000 on it's Starter Portfolio, while Aztec's equity curve is rising as sharply as at any time during the run.
	www.trade-system.com (414 words)

	Angular aberration from observer motion
		However, there are two good reasons to accept this shortcoming: (i) The angular aberration correction is generally small, with the exception of aberration in the vicinity of strong shocks with large velocity gradients.
		We have encountered numerical fluctuations in the neutrino distribution function at the shock position at this late time that are due to this fixed choice of differencing in the angular advection in the aberration terms.
		, we demonstrate that the expected energy violations from angular aberration are unlikely to dominate the violations of energy conservation by the adaptive grid or a mismatch in
	www.cita.utoronto.ca /~liebend/transport/node14.html (450 words)

	Chromosomal aberration frequencies in patients with thalassaemia major undergoing therapy with deferiprone and ... (Site not responding. Last check: 2007-09-20)
		Chromosomal aberration frequencies in patients with thalassaemia major undergoing therapy with deferiprone and deferoxamine in a comparative crossover study -- Marshall et al.
		Chromosomal aberration frequencies in patients with thalassaemia major undergoing therapy with deferiprone and deferoxamine in a comparative crossover study*
		with a decrease in the frequency of chromosomal aberrations.
	mutage.oupjournals.org /cgi/content/abstract/18/5/457 (383 words)

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