| 释义 |
aplanat|ˈæplənæt|
[a. G. aplanat (A. Steinheil, 1866); cf. aplanatic a.]
An aplanatic lens. Also attrib.
1890Anthony's Photogr. Bull. III. 129 After Steinheil invented his applanat [sic], Dallmeyer copied the same and called it Rapid Rectilinear. 1895J. A. Hodges Photographic 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. 1901Brit. Jrnl. Photogr. 1 Nov. 695/1 These aplanats consist of strong refracting flint glasses, whose quotient and colour diversion do not much differ. 1951Engineering 9 Mar. 297/2 The two-mirror aplanat telescopes. |