The achromatic lens, which greatly reduced color aberrations in objective lenses and allowed for shorter and more functional telescopes, first appeared in a 1733 telescope made by Chester Moore Hall, who did not publicize it.
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Design of compound achromatic lenses, in which chromatic aberration is largely cancelled, uses a quantification of a glass's dispersion given by its Abbe number " V ", where " lower"
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However, other large refractors include a 21st-century Solar telescope which is not directly comparable because it uses a single element non-achromatic lens, and the short-lived Great Paris Exhibition Telescope of 1900.
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The next big step in the development of refractors was the advent of the Achromatic lens in the early 18th century, which corrected the chromatic aberration in Keplerian telescopes up to that time allowing for much shorter instruments with much larger objectives.
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After devoting some time to the inquiry he found that by combining two lenses formed of different kinds of glass, he could make an achromatic lens where the effects of the unequal refractions of two colors of light ( red and blue ) was corrected.
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The practical potential of Newton's first telescope was made more clear by the end of the 18th century, when the largest reflector had grown to nearly 50 inches aperture ( 126 cm ) while the largest achromatic lens objective was not more than about 5 inches ( 13 cm ).
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Most of the human eye's wavelength sensitivity curve, shown here, is bracketted by the Abbe number reference wavelengths of 486.1 nm ( blue ) and 656.3 nm ( red ) Abbe numbers are used in the design of achromatic lenses, as their " reciprocal " is proportional to dispersion ( slope of refractive index versus wavelength ) in the wavelength region where the human eye is most sensitive ( see graph ).
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