Anastigmat is a lens in which almost all aberrations are corrected, including astigmatism and curvature of the image field [1] . Anastigmata can be considered lenses of any designs and types that meet these conditions. Most anastigmatov give good image quality throughout the field with large values of the relative aperture , providing a high aperture ratio .
An astigmat consists of at least three lenses (if it does not contain other optical elements and aspherical lenses). The simplest anastigmat is a triplet . The vast majority of modern photographic, film and television lenses - anastigmata. For the first time, the Protar lens ( German Protar ), corresponding to the anastigmate class, was designed by the German optician Paul Rudolf in 1890 [2] .
See also
- Aplanat
- Achromat
Sources
- ↑ Photo kinotekhnika, 1981 , p. 26
- ↑ Boris Bakst. Leica. Parade of perfection . Articles about photographic equipment . Photo workshops RSU (November 16, 2012). The appeal date is April 25, 2015.
Literature
- E. A. Iofis . Photo kinotekhnika / I. Yu. Shebalin. - M.,: “Soviet Encyclopedia”, 1981. - p. 26. - 447 p.
- D.S. Volosov. Photographic optics. - Ed. 2nd, Corr .. - M .: "Art", 1978. - 543 p.