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However, it is well known that he was not the first to make achromatic lenses.
Had he done so, he would almost certainly have invented the achromatic lens.
In 1765, he introduced an astronomical instrument fitted with two achromatic lenses.
An achromatic lens focused an 8mm-wide, slightly converging light beam.
Achromatic lenses are corrected to bring two wavelengths (typically red and blue) into focus in the same plane.
An Achromatic telescope uses an achromatic lens to correct for this.
An early step in the development of the achromatic lens, since it corrects some chromatic aberration.
An achromatic lens is a compound lenses made with two types of glass with different dispersion.
Great refractors were large refracting telescopes using achromatic lenses (as opposed to mirrors).
The 1955 model came with a meniscus lens, later replaced with an achromatic lens.
Anastigmat is an achromatic lens used to reduce or eliminate astigmatism designed specifically for photographic applications.
An erfle is a 5-element eyepiece consisting of two achromatic lenses with extra lenses in between.
He used the achromatic lens to build the first refracting telescope free from chromatic aberration (colour distortion).
The difficulties of fabricating two disks of optical glass required to make a large achromatic lens were formidable.
The residual color error (tertiary spectrum) can be up to an order of magnitude less than that of an achromatic lens.
In telescopes they can a be pre-18th century simple single element objective lenses which were used before the invention of doublet achromatic lenses.
In collaboration with optician George Dollond Barlow worked on achromatic lenses for telescopes.
Malcolm used an original design incorporating achromatic lenses like those used in telescopes, and improved the windage and elevation adjustments.
Brewster chose renowned achromatic lens developer Philip Carpenter as the sole manufacturer of the kaleidoscope in 1817.
It can be further minimized by using an achromatic lens or achromat, in which materials with differing dispersion are assembled together to form a compound lens.
An achromatic lens or achromat is a lens that is designed to limit the effects of chromatic and spherical aberration.
The achromatic telescope is a refracting telescope that uses an achromatic lens to correct for chromatic aberration.
The need for very long focal length refracting telescope objectives was finally eliminated with the invention of the achromatic lens in the middle of the 18th century.
He quickly became a leading figure in the production of achromatic lenses, even supplying Peter Dollond, a renowned developer of the lenses.
English optician Chester Moor Hall (1703-1771) develops an achromatic lens (or achromat) commonly used as the objective of small refractor telescopes.
