achromatic lens


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Words related to achromatic lens

a compound lens system that forms an image free from chromatic aberration

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References in periodicals archive ?
This study aims to develop an achromatic lens design that combines the advantages of Fresnel lenses (high efficiency, reduced thickness, and lightweight construction) along with the stability and lack of spectrum aberrations of achromatic lenses.
Describes the development of an affordable precision hybrid glass-polymer achromatic lens fabricated by microinjection molding.
* Achromatic Lens: Lens comprising two or more elements, usually of crown and flint glass, that corrects for chromatic aberration, or the scattering of color.
After Newton had given up the idea of an achromatic lens, he concentrated on his invention, the reflecting telescope, recognizing quite correctly that in a reflecting telescope, light was focused independent of wavelength.
Sporting a multicoated 3.5-inch (90-mm) achromatic lens with a focal length of 910 mm (f/10), this refractor is shipped with a German equatorial mount (motor drive optional) and an adjustable aluminum tripod.
Hall did not publicize his lens properly, and John Dollond (1706-1761), who prepared an achromatic lens in 1757, often gets the credit.
In an effort to replicate the views he had with Peltier's big refractor (but minus the color aberration inherent in an achromatic lens that size), Doug opted to make his Newtonian's spider with three curved vanes, thus eliminating the diffraction spikes produced by straight-vaned spiders.
Sporting a multicoated 3.5-inch (90-mm) achromatic lens with a focal length of 910 mm (f/10), this refractor is shipped with an altazimuth mount (which has dual-axis slow-motion controls) and an adjustable aluminum tripod.
Chromatic aberration, which had been the plague of telescopists for the first century of their existence till the reflecting telescope (see 1668) and the achromatic lens (see 1733) came into use, was still plaguing microscopists.
There are limits to what can be expected of an f/4.3 two-element, achromatic lens. And because it's impossible to suspend the laws of physics, the Moon, Venus, and Jupiter appear with garish violet haloes.
Only the 1729 advent of the achromatic lens corrected the color problems and helped stop the insanity.