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An achromatic doublet brings red and blue light to the same focus, and is the earliest example of an achromatic lens. 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 ...
George Bass was an optician known to have made an achromatic doublet around 1733.. The specifications for the lens elements were given by Chester Moore Hall.According to Hoyle, [1] Hall wished to keep his work on the achromatic lenses a secret and contracted the manufacture of the crown and flint lenses to two different opticians, Edward Scarlett and James Mann. [2]
This list covers optical lens designs grouped by tasks or overall type. The field of optical lens designing has many variables including the function the lens or group of lenses have to perform, the limits of optical glass because of the index of refraction and dispersion properties, and design constraints including realistic lens element center and edge thicknesses, minimum and maximum air ...
Kiron Corporation was a subsidiary of Kino Precision Industries, Ltd., a Japanese manufacturer of photographic lenses.Kiron was based in Carson, California, operating in the 1980s primarily as the United States distributor of Kiron lenses, which were offered in a variety of mounts compatible with many popular 135 film manual focus single-lens reflex camera systems.
For the construction of an achromatic collective lens (positive) it follows, by means of equation (4), that a collective lens I. of crown glass and a dispersive lens II. of flint glass must be chosen; the latter, although the weaker, corrects the other chromatically by its greater dispersive power. For an achromatic dispersive lens the converse ...
In this arrangement, the eye lens is a plano-concave/ double convex achromatic doublet (the flat part of the former facing the eye) and the field lens is a double-convex singlet. A reversed Kellner eyepiece was developed in 1975 and in it the field lens is a double concave/ double convex achromatic doublet and the eye lens is a double convex ...
The superachromat or superachromatic lens was first conceived and developed by Maximilian Herzberger as the ultimate well-corrected lens. The color shift curve of a superachromat is a quartic , meaning that in theory four separate colors can be brought to focus in the same plane, while simultaneously correcting spherical aberration and field ...
Often one element is a positive lens made of crown glass and the other is a negative lens made of flint glass. This combination produces a better image than a simple lens. Some Trilobites, which are now extinct, had natural doublet lenses in their eyes. [1] Apochromats can also be made as doublets. Doublets can be air-spaced, cemented, or "oiled".
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