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Topic: Achromatic

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	Achromatic Doublets
		Achromatic doublets are the simplest form of compound lens.
		Achromats are corrected for on-axis chromatic and spherical aberration making them good for broadband collimation and focusing.
		These achromatic doublets are made from either crown and flint optical glasses.
	www.optarius.com /achromatic_doublets.htm (122 words)

	Quadrupole singlet focusing for achromatic parallel-to-parallel devices - Patent 4455489
		Achromatic optical elements are essential in commercial and medical therapeutic irradiation systems because the primary attribute for such operations is the relatively high beam intensity and control thereof.
		It is a necessary and sufficient condition for an achromatic deflection element that momentum dispersive trajectory d.sub.x (initial central trajectory direction, having a magnitude of P.sub.0 +.DELTA.P) is dispersed and brought to parallelism with the central trajectory P.sub.0 at the midpoint deflection angle.alpha..sub.1 +.alpha..sub.2, that is, at the symmetry plane.
		Further, the trajectory of particles initially displaced from, and parallel with trajectory P.sub.0 (in the bending plane) are focused to a cross-over with trajectory P.sub.0 at the symmetry plane.
	www.freepatentsonline.com /4455489.html (3531 words)

	ARRI Lens Tutorial - What is an Achromatic Lens Assembly? (Site not responding. Last check: 2007-09-10)
		An achromatic assembly is a group of lenses designed to compensate for various unwanted optical effects.
		Achromatic assemblies are used in most modern cine lenses.
		Achromatic assemblies are particularly good at compensating for chromatic aberration, an optical effect that can be seen as color fringing in the image, usually at high contrast edges.
	www.arri.com /prod/cam/tutorials/achromatic/achromatic.html (264 words)

	Chromatic aberration - Wikipedia, the free encyclopedia
		For an achromatic doublet, visible wavelengths have approximately the same focal length.
		The use of achromats was an important step in the development of the optical microscope.
		An alternative to achromatic doublets is the use of diffractive optical elements.
	en.wikipedia.org /wiki/Achromatic (730 words)

	Achromatic Lens - Doublets
		Achromatic doublet lenses have significantly better optical performance than singlet lenses in visible imaging and laser beam manipulation applications.
		Achromatic Lenses are consist of two elements, usually of a positive low-index crown glass cemented to a negative high-index flint glass that have been corrected for chromatic aberration with respect to two selected wavelengths in the blue and red region of the spectrum.
		One frequent use of Achromatic Lens is to achieve diffraction limited focusing of a laser beam.
	www.achromaticlens.com (226 words)

	Achromatic anamorphic prism pair (US5596456)
		An achromatic anamorphic prism pair for the conversion of the elliptical output beam of a tunable diode laser to a circular beam.
		The achromatic design prevents a directional shift in the output beam with respect to the optical axis of the system laser wavelength is varied.
		An achromatic anamorphic prism pair for the conversion of an input beam having an elliptical cross-section to an output beam having a circular cross section comprising;
	www.delphion.com /details?pn=US05596456__ (198 words)

	Sphæra issue no. 8: article 5 (Site not responding. Last check: 2007-09-10)
		It is the original manuscript of the rebuttal prepared by Peter Dollond to Jesse Ramsden's charge that John Dollond took the idea of the achromatic telescope from the previous work of Chester Moor Hall, having learnt of it through an encounter with the optician George Bass.
		John Dollond's famous paper on achromatic combinations of lenses was read at the Royal Society in June 1758 and published in the Philosophical Transactions the same year.
		Ramsden's paper was King's source for the account of Hall ordering crown and flint components for an achromatic doublet separately from Edward Scarlett and James Mann, and of each of them independently sub-contracting their order to George Bass, who was thus able to discover the secret.
	www.mhs.ox.ac.uk /sphaera/issue8/articl5.htm (2044 words)

	Stellarvue 80mm Achromatic Refractors
		I own two achromatic Stellarvue telescopes, the 80/9D and the Nighthawk that I use for visual observation.
		While the explanation of the optical design and performance distinctions between apochromatic and achromatic refractors is best left as an exercise for the reader, one additional important fact is that the former are usually far more expensive than the latter.
		The better of the two telescopes is the 80/9D, solely on the basis of optical performance at the eyepiece and largely because physics decrees that a longer focal length is inherently more forgiving with respect to the optical shortcomings of achromatic telescopes in bringing all wavelengths of visible light to the same focal point.
	www.novac.com /resources/reviews/stellarvue80.php (1505 words)

	Achromatic Lenses feature anti-reflection coating., Edmund Optics
		Lenses consist of 2 optical components cemented together to form achromatic doublet, which is computer-optimized to correct for on-axis spherical and chromatic aberrations.
		The most popular 6.25, 9.0, 12.5, and 25 mm achromats are now offered with the VIS 0° multilayer broadband anti-reflection coating designed to minimize reflections in the visible spectrum.
		Achromatic lenses consist of two optical components cemented together to form an achromatic doublet, which is computer optimized to correct for on-axis spherical and chromatic aberrations.
	news.thomasnet.com /fullstory/485614/rss (547 words)

	Journal of Vision - A comparison of the BOLD fMRI response to achromatic, L/M opponent and S-cone opponent cardinal ...
		A comparison of the BOLD fMRI response to achromatic, L/M opponent and S-cone opponent cardinal stimuli in human visual cortex: II.
		The appropriate contrast metric for the comparison of color and luminance sensitivity is unknown and so we made the comparison using both a perceptual match between stimuli (in multiples of detection threshold), a direct contrast match (in cone contrast).
		This is in contrast to a region in the ventral occipital cortex (beyond V4v) that exhibited stronger fMRI signals to chromatic compared to achromatic stimuli.
	journalofvision.org /5/8/265 (464 words)

	Achromatic telescope - Wikipedia, the free encyclopedia
		The achromatic telescope is a refracting telescope that is constructed to correct for chromatic aberration.
		In the achromatic doublet, one of the lenses is normally made of Flint glass, giving it a relatively high index of refraction, while the other if made of Crown glass with a lower index of refraction.
		An apochromatic refractor is a variant of the achromatic refracting telescope that uses an arrangement of three or more lenses to correct for chromatic aberration, while also minimizing other types of aberrations that can occur.
	en.wikipedia.org /wiki/Achromatic_telescope (363 words)

	Achromatic Lens
		Achromatic Lenses consist of two or more elements, usually of crown and flint glass that have been corrected for chromatic aberration with respect to two selected wavelengths.
		Red Optronics provides achromatic lenses consisting of two elements.
		The minimum diameter of Achromatic Lens we can process is 3.5mm.
	www.redoptronics.com /achromatic-lenses.html (87 words)

	Currently Available 2 Element (Achromatic) Close-up Lenses
		The Brenner catalog does not list the manufacturer of their CU lens.
		He also stated that he has tried the B+W +10 diopter CU lens and that the B+W isn't achromatic and thus shows colour fringing.
		The Hoya filter is shown as being available in 58mm size on the THK (Hoya distributor) web page but not on B & H's page.
	www.angelfire.com /ca/erker/closeups.html (812 words)

	Synonyms of achromatic — Infoplease.com
		usage: being of the achromatic color of maximum lightness; having little or no hue owing to reflection of almost all incident light; "as white as fresh snow"; "a bride's white dress"
		usage: being of the achromatic color of maximum darkness; having little or no hue owing to absorption of almost all incident light; "fl leather jackets"; "as fl as coal"; "rich fl soil"
		achromatic (vs. chromatic), argent, silver, silvery, silverish, ash-gray, ash-grey, ashy, auburn, reddish-brown, canescent, chalky, charcoal, charcoal-gray, charcoal-grey, coal-fl, jet, jet-fl, pitchy, sooty, ebon, ebony, gray, grey, grayish, greyish, hueless, ink-fl, inky, inky-fl, iron-gray, iron-grey, lily-white, milk-white, neutral, oxford-gray, oxford-grey, pearly, pearly-white, sable, slate-gray, slaty, slatey, stone-gray, snow-white, snowy, whitish, off-white, flish, colorless#2, colourless
	www.infoplease.com /thesaurus/achromatic (132 words)

	Meade Instruments Corporation - LXD55 Achromatic Refractors
		With objective lenses that resolve to the theoretical limits for their apertures, Meade 5" and 6" LXD55 refractors present all of the diffraction-limited optical performance obtainable from the classical 2-element achromat design.
		Observing with a Meade 5" or 6" refractor is an experience unlike that with other telescopes, as the refractors' large unobstructed clear apertures enable a level of resolution and high contrast normally reserved for larger instruments of other types.
		Model AR-5: 5" f/9 Achromatic Refractor — Explore over 30,000 of Autostar's database objects — galaxies, nebulae, and star clusters — or any object of known RA and Dec., as the telescope moves automatically at 4.5°/sec.
	www.meade.com /catalog/lxd55/lxd55_achrofrac.html (448 words)

	Journal of Vision - Combining achromatic and chromatic cues to transparency, by Fulvio, Singh, & Maloney
		Observers were shown six-region stimulus displays similar to those used by R. Kasrai and F. Kingdom (2001) and made adjustments of the color and luminance attributes of one of the filter regions to achieve the best percept of transparency.
		In Experiment 1, we measured reliability for achromatic, L, superimposed luminance with color, L + C, and superimposed luminance with polarity-reversing color, L + iC.
		In Experiment 3, we manipulated the transmittance of the achromatic and chromatic filters separately and investigated how this influences the settings made for each attribute.
	journalofvision.org /6/8/1 (338 words)

	Bolder Vision Optik \| Achromatic Waveplates, Retarders
		Bolder Vision now offers low-cost achromatic waveplates, which can replace many single wavelength waveplates with just one component.
		Bolder Vision now carries an off the shelf achromat for the visible wavelength range of 400-700nm.
		The visible achromat is a valuable lab tool, which can replace many of your single wavelength waveplates.
	www.boldervision.com /achro.html (112 words)

	achromatic - OneLook Dictionary Search
		adjective: being of the achromatic color of maximum lightness; having little or no hue owing to reflection of almost all incident light
		Phrases that include achromatic: achromatic lens, achromatic colour, achromatic prism, achromatic threshold, achromatic condenser, more...
		Words similar to achromatic: achromatically, achromatism, achromatize, fl, colorless, white, more...
	www.onelook.com /?w=achromatic (287 words)

	Meadowlark Optics \| Precision Achromatic (via CobWeb/3.1 planetlab2.cs.unc.edu) (Site not responding. Last check: 2007-09-10)
		Meadowlark Optics designs its Precision Achromatic Retarders to provide a nearly constant retardance value over a broad wavelength region.
		Precision Achromatic Retarders: standard 1/4- and 1/2-wave devices for common wavelength regions in the visible and near infrared.
		Data on the performance of a 1/4-wave Achromatic Retarder.
	www.meadowlark.com.cob-web.org:8888 /products/RetardersAchromatic.php (109 words)

	4010 Celestron Junior Microscope with an Achromatic Objective of 20x.
		Celestron Junior Microscope with an Achromatic Objective of 20x.
		The perfect starting microscope - it has a 10x eyepiece with an achromatic objective of 20x for a 200x power view.
		This unit is all metal and has a plain stage with clips, a 42mm plano-convex mirror for adjustable lighting, and a smooth rack and pinion focuser.
	www.adorama.com /CNMSJ.html (85 words)

	Meade DS-2070AT 70mm Achromatic Refractor 20073
		And, with its wide-ranging capabilities, Autostar is a valuable tool in the hands of the most experienced observer as well.
		Newtonian reflecting telescopes, Models DS-2114ATS and DS-2130ATS, of the series include high-resolution primary and secondary mirrors free of the optical zones and irregularities often found on optics of lesser quality.
		Integrated to the focuser sleeves of these models is an achromatic relay lens, allowing longer telescope focal lengths to be housed in short, compact tubes.
	www.opticsplanet.net /meade-ds2000.html (1127 words)

	Edmund Optics - Achromatic Waveplates
		Unlike standard waveplates, Achromatic Waveplates provide a constant phase shift independent of the wavelength of light that is used.
		This wavelength independence is achieved by using two different crystalline materials to yield quarter- or half-wave retardation over a broad spectral range.
		The flat response of an Achromatic Waveplate is ideal for use with tunable lasers, multiple laser-line systems and other broad spectrum sources.
	www.edmundoptics.com /onlinecatalog/displayproduct.cfm?productID=2421 (168 words)

	Meade 40mm Modified Achromatic 1.25"
		These fine 3-element eyepieces offer the price-conscious amateur an excellent alternative to more sophisticated and expensive oculars.
		The four Modified Achromatic focal lengths shown here are an optical advancement over the traditional Kellner and yield sharp, faithful lunar, planetary, and deep-space images.
		Nothing can be copied or re-used from this entire site without the express written consent of the owners of Anacortes Telescope and Wild Bird.
	www.buytelescopes.com /product.asp?pid=975 (183 words)

	Lens (optics) - Wikipedia, the free encyclopedia (via CobWeb/3.1 planetlab2.cs.unc.edu) (Site not responding. Last check: 2007-09-10)
		Chromatic aberration of a lens is seen as fringes of color around the image.
		It can be minimised by using an achromatic doublet (or achromat) in which two materials with differing dispersion are bonded together to form a single lens.
		An apochromat is a lens or lens system which has even better correction of chromatic aberration, combined with improved correction of spherical aberration.
	en.wikipedia.org.cob-web.org:8888 /wiki/Lens_(optics) (2673 words)

	Definition of achromatic - Merriam-Webster Online Dictionary
		1 : refracting light without dispersing it into its constituent colors : giving images practically free from extraneous colors achromatic telescope>
		Learn more about "achromatic" and related topics at Britannica.com
		Get the Top 10 Search Results for "achromatic"
	www.m-w.com /cgi-bin/dictionary?book=Dictionary&va=achromatic (71 words)

	Optarius - Achromat Achromatic lens Achromatic doublet Plano-concave le, Beam splitter Laser beam splitter Beam ...
		Optarius - Achromat Achromatic lens Achromatic doublet Plano-concave le, Beam splitter Laser beam splitter Beam combiner Dichroic mir, Aspheric lens Aspheric condenser, Neutral density filter Interference filter Edge filter Prism, Cylindrical lens Cylindrical optics Wave plate Quarter
		Our purpose is to help you select the most suitable optical components, whatever your application.
		including achromatic doublet lenses, plano-convex lenses, plano-concave lenses, meniscus lenses, bi-convex and bi-concave lenses, aspheric condenser lenses, cylindrical lenses.
	www.optarius.com (467 words)

	Telescope achromatic lenses objectives construction building making Accessories parts homemade kits ATM telescopes ...
		Telescope achromatic lenses objectives construction building making Accessories parts homemade kits ATM telescopes equipment
		Please note - Due to the small demand of achromatic* lenses, ordering periods will be longer than usual*
		International Residents Please Call 61+ 8 8381 3188
	www.telescopes-astronomy.com.au /telescope_achromatic_lenses.htm (103 words)

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