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In an achromatic lens, two wavelengths are brought into the same focus, here red and blue. An achromatic lens or achromat is a lens that is designed to limit the effects of chromatic and spherical aberration. Achromatic lenses are corrected to bring two wavelengths (typically red and blue) into focus on the same plane.
An Achromatic telescope uses an achromatic lens to correct for this. An achromatic lens is a compound lenses made with two types of glass with different dispersion. One element, a concave lens made out of Flint glass, has relatively high dispersion, while the other, a convex element made of Crown glass, has a lower dispersion.
The main telescope technologies during this period were refractors with non-achromatic objectives (single lens), speculum metal reflectors, refractors with achromatic doublets objective (doublet lens), and apochromatic triplets (after 1760s) objectives. The list is inherently limited by what examples and records survived.
Biography. Dollond was the son of a Huguenot refugee, a silk -weaver at Spitalfields, London, where he was born. He followed his father's trade, but found time to acquire a knowledge of Latin, Greek, mathematics, physics, anatomy and other subjects. In 1752 he abandoned silk-weaving and joined his eldest son, Peter Dollond (1731–1820), who in ...
Galileoscope. Galileoscope. The Galileoscope is a small mass-produced refractor telescope, designed with the intention of increasing public interest in astronomy and science. It was developed for the International Year of Astronomy 2009. [1] It is meant to be an inexpensive means by which millions of people can view the same things seen by ...
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The front doublet is air-gapped and divergent; the rear doublet is glued and convergent. This arrangement was better at correcting spherical and chromatic aberrations and astigmatism than previous lens designs. In optics, a doublet is a type of lens made up of two simple lenses paired together. Such an arrangement allows more optical surfaces ...
Dialyte lens. A dialyte lens (sometimes called a dialyt [1] : 1873) is a compound lens design that corrects optical aberrations where the lens elements are widely air-spaced. [2] The design is used to save on the amount of glass used for specific elements or where elements can not be cemented because they have dissimilar curvatures. [3]
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