aplanaticadj.
/apləˈnatɪk/ Free from aberration; spec. applied to a compound lens which is free from spherical aberration or divergence of rays of light from the focus.
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the world > physical sensation > sight and vision > optical instruments > lens > [adjective] > types of lenses
convex?a1560
planoconvex1665
concavo-convex1677
convexo-concave1693
strong1732
aplanatic1799
periscopic1803
omphaloptic1819
polyzonal1823
shallow1837
first-order1846
periscopical1846
orthoscopic1853
rectilinear1874
overcorrected1875
sphero-cylindrical1881
wide-aperture1882
afocal1887
apochromatic1887
anastigmatic1890
telecentric1892
photovisual1899
aspherical1922
aspheric1923
multifocal1928
plano1944
demagnifying1959
1799 W. Jones Adams's Lect. Nat. & Exper. Philos. (ed. 2) II. xxii. 531 As..[Blair] conceives that he has thus removed the aberration, he distinguishes his instrument by the term Aplanatic.
1867 J. Hogg Microscope (ed. 6) i. ii. 26 An ‘aplanatic doublet’ consisting of a double convex lens and a meniscus.
1869 J. Tyndall Notes 9 Lect. on Light §165 A spherical lens cannot be rendered aplanatic.
This entry has not yet been fully updated (first published 1885; most recently modified version published online March 2021).
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adj.1799