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A meniscus corrector is a negative meniscus lens that is used to correct spherical aberration in image-forming optical systems such as catadioptric telescopes. It works by having the equal but opposite spherical aberration of the objective it is designed to correct (usually a spherical mirror ).
A negative meniscus lens has a steeper concave surface (with a shorter radius than the convex surface) and is thinner at the centre than at the periphery. Conversely, a positive meniscus lens has a steeper convex surface (with a shorter radius than the concave surface) and is thicker at the centre than at the periphery.
Alvan G. Clark, the son of the founder of the eponymous American optical company, designed a photographic lens using a symmetric arrangement of two Gauss lenses and patented it in 1888; [4] Paul Rudolph introduced the Zeiss Planar as an improved Double-Gauss using cemented doublets in the place of the inner negative meniscus elements, [2]: 121 ...
Diagram of a Mangin mirror. In optics, a Mangin mirror is a negative meniscus lens with the reflective surface on the rear side of the glass forming a curved mirror that reflects light without spherical aberration if certain conditions are met.
The meniscus lens on the bottom is a positive element. The negative (diverging) meniscus lens has a thicker edge than the center, and represents the case where the concave surface (shown in red) has a smaller radius than the convex surface (shown in green). The meniscus lens on the top is a negative element.
Various lens shapes, and the location of the principal planes. ʟ̩. Converging or positive lenses. 1 - Symmetrical double convex lens. 2 - Asymmetrical double-convex lens 3 - Plano- convex lens. 4 - Positive meniscus lens. Diverging or negative lenses. 5 - Symmetrical biconcave lens. 6 - Asymmetrical biconcave lens. 7 - Plano-concave lens.
A 150mm aperture Maksutov–Cassegrain telescope. The Maksutov (also called a "Mak") [1] is a catadioptric telescope design that combines a spherical mirror with a weakly negative meniscus lens in a design that takes advantage of all the surfaces being nearly "spherically symmetrical". [2]
The advent of the Biogon opened the way to more extreme wide-angle lenses. Bertele continued to develop his design, patenting an asymmetric wide-angle lens in 1952 that covered an astonishing 120° angle of view "and beyond, practically distortion free", by adding a strong negative meniscus front element to the Biogon design, showing influences from earlier fisheye lens designs, including the ...