Definition of Aplanat. Meaning of Aplanat. Synonyms of Aplanat

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Definition of Aplanat

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Aplanatic focus
Focus Fo"cus, n.; pl. E. Focuses, L. Foci. [L. focus hearth, fireplace; perh. akin to E. bake. Cf. Curfew, Fuel, Fusil the firearm.] 1. (Opt.) A point in which the rays of light meet, after being reflected or refrcted, and at which the image is formed; as, the focus of a lens or mirror. 2. (Geom.) A point so related to a conic section and certain straight line called the directrix that the ratio of the distace between any point of the curve and the focus to the distance of the same point from the directrix is constant. Note: Thus, in the ellipse FGHKLM, A is the focus and CD the directrix, when the ratios FA:FE, GA:GD, MA:MC, etc., are all equal. So in the hyperbola, A is the focus and CD the directrix when the ratio HA:HK is constant for all points of the curve; and in the parabola, A is the focus and CD the directrix when the ratio BA:BC is constant. In the ellipse this ratio is less than unity, in the parabola equal to unity, and in the hyperbola greater than unity. The ellipse and hyperbola have each two foci, and two corresponding directrixes, and the parabola has one focus and one directrix. In the ellipse the sum of the two lines from any point of the curve to the two foci is constant; that is: AG+GB=AH+HB; and in the hyperbola the difference of the corresponding lines is constant. The diameter which passes through the foci of the ellipse is the major axis. The diameter which being produced passes through the foci of the hyperbola is the transverse axis. The middle point of the major or the transverse axis is the center of the curve. Certain other curves, as the lemniscate and the Cartesian ovals, have points called foci, possessing properties similar to those of the foci of conic sections. In an ellipse, rays of light coming from one focus, and reflected from the curve, proceed in lines directed toward the other; in an hyperbola, in lines directed from the other; in a parabola, rays from the focus, after reflection at the curve, proceed in lines parallel to the axis. Thus rays from A in the ellipse are reflected to B; rays from A in the hyperbola are reflected toward L and M away from B. 3. A central point; a point of concentration. Aplanatic focus. (Opt.) See under Aplanatic. Conjugate focus (Opt.), the focus for rays which have a sensible divergence, as from a near object; -- so called because the positions of the object and its image are interchangeable. Focus tube (Phys.), a vacuum tube for R[oe]ntgen rays in which the cathode rays are focused upon the anticathode, for intensifying the effect. Principal, or Solar, focus (Opt.), the focus for parallel rays.
Aplanatism
Aplanatism A*plan"a*tism, n. Freedom from spherical aberration.

Meaning of Aplanat from wikipedia

- The Rapid Rectilinear also named Aplanat is a famous photographic lens design. The Rapid Rectilinear is a lens that is symmetrical about its aperture...
- Chappe, Paris 2002 Die Ästhetik der Lüste, Fotomuseum Leipzig 2002 Icon, Aplanat Galerie, Hamburg 2001 Jolis Momes, Acte 2, Paris 2000 Die Ästhetik der...
- Rapid-Rectilinear (UK) and Steinheil Aplanat (modern Germany). By coincidence, John Dallmeyer's Rapid-Rectilinear and Adolph Steinheil's Aplanat had virtually identical...
- specialized lens for projection, though some, such as the Rapid Rectilinear or Aplanat [citation needed]could be used in both camera and enlarger. Enlarger lenses...
- was a sharp drop in sharpness at the edges, which was corrected in the Aplanat lens developed by Hugo Adolph Steinheil [de]. The lens consisted of two...
- S2CID 51647158. Vladimir Sacek. "Paul-Baker and other three-mirror anastigmatic aplanats". Archived from the original on 2013-06-17. "2m-Alfred-Jensch-Telescope"...
- Bedingungen des Aplanatismus der Linsensysteme" [The Conditions Under Which Aplanatism of the Lens Systems]. Jenaische Zeitschrift für Naturwissenschaft (in...
- International, p. 97. Kubacki, Emily (July 2005), "Understanding Lenses: Aplanats and Achromats", Photonics Spectra, retrieved 2019-12-10. Dijkster****s,...
- Sacek, V. (14 July 2006). "Paul-Baker and other three-mirror anastigmatic aplanats". Telescope-Optics.net. Retrieved 13 August 2013. Korsch, Dietrich (December...
- Hinz; A publication by Aplanat Galerie für Fotografie accompanying the Exhibition, Limited ed., 1. ed., Hamburg 2002, Germany: Aplanat Galerie für Fotografie...