aplanatn.

Brit.

/ˈaplənat/, U.S.

/ˈæpləˌnæt/

Etymology: < German aplanat (A. Steinheil, 1866); compare aplanatic adj.

A symmetrical doublet composed of achromatized lenses; an aplanatic lens. Also attributive.

ΘΚΠ

the world > physical sensation > sight and vision > optical instruments > lens > [noun] > other lenses

concave1632

globe1653

meniscus1693

hemispherule1696

convex1705

omphaloptic1728

omphalopter1738

crown lens1764

achromatic1785

condenser1798

meniscus lens1820

Fresnel lens1835

bull's-eye1839

Stanhope lens1850

spot lens1860

amplifier1866

achromat1873

projectora1884

aplanat1890

triplet condenser1892

Aldis lens1902

monocentric1922

Schmidt correcting plate1934

coated lens1948

Panavision1955

Schmidt correcting lens1961

re-imaging1962

1890 Internat. Ann. Anthonys Photogr. Bull. 129 After Steinheil invented his applanat [sic], Dallmeyer copied the same and called it Rapid Rectilinear.

1895 J. A. Hodges Photogr. Lenses viii. 44 Prior to 1866, when Steinheil introduced his rapid aplanat working at f/7, all doublet lenses required comparatively small apertures in order to obtain sufficient definition and flatness of field.

1901 Brit. Jrnl. Photogr. 1 Nov. 695/1 These aplanats consist of strong refracting flint glasses, whose quotient and colour diversion do not much differ.

1902 J. Waterhouse in Encycl. Brit. XXXI. 695/1 Dr. Miethe calculated the data for two lenses brought out by Hartnack (1889), one of them a symmetrical aplanat.

1951 Engineering 9 Mar. 297/2 The two-mirror aplanat telescopes.

This entry has not yet been fully updated (first published 1933; most recently modified version published online December 2021).

单词	aplanat
释义	aplanatn. Brit. /ˈaplənat/, U.S. /ˈæpləˌnæt/ Etymology: < German aplanat (A. Steinheil, 1866); compare aplanatic adj. A symmetrical doublet composed of achromatized lenses; an aplanatic lens. Also attributive. ΘΚΠ the world > physical sensation > sight and vision > optical instruments > lens > [noun] > other lenses concave1632 globe1653 meniscus1693 hemispherule1696 convex1705 omphaloptic1728 omphalopter1738 crown lens1764 achromatic1785 condenser1798 meniscus lens1820 Fresnel lens1835 bull's-eye1839 Stanhope lens1850 spot lens1860 amplifier1866 achromat1873 projectora1884 aplanat1890 triplet condenser1892 Aldis lens1902 monocentric1922 Schmidt correcting plate1934 coated lens1948 Panavision1955 Schmidt correcting lens1961 re-imaging1962 1890 Internat. Ann. Anthonys Photogr. Bull. 129 After Steinheil invented his applanat [sic], Dallmeyer copied the same and called it Rapid Rectilinear. 1895 J. A. Hodges Photogr. Lenses viii. 44 Prior to 1866, when Steinheil introduced his rapid aplanat working at f/7, all doublet lenses required comparatively small apertures in order to obtain sufficient definition and flatness of field. 1901 Brit. Jrnl. Photogr. 1 Nov. 695/1 These aplanats consist of strong refracting flint glasses, whose quotient and colour diversion do not much differ. 1902 J. Waterhouse in Encycl. Brit. XXXI. 695/1 Dr. Miethe calculated the data for two lenses brought out by Hartnack (1889), one of them a symmetrical aplanat. 1951 Engineering 9 Mar. 297/2 The two-mirror aplanat telescopes. This entry has not yet been fully updated (first published 1933; most recently modified version published online December 2021). < n.1890
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