| 单词 | concentric lens |
| 释义 | > as lemmasconcentric lens concentric lens n. Photography (now chiefly historical) a compound lens consisting of planoconvex and planoconcave lenses of such dimensions that the convex and concave surfaces of the combined lens represent portions of two concentric spheres.Invented in 1888 by Dr Hugo Schröder of Ross & Co. ΘΚΠ society > leisure > the arts > visual arts > photography > camera > parts and accessories of camera > [noun] > lens > types of portrait lens1852 short-focus lens1862 periscope1865 rectilinear1867 pantoscope1868 wide-angle1868 long lens1876 apochromatic1887 anastigmat1890 concentric lens1890 euryscope1890 landscape lens1890 rectigraph1890 symmetrical1890 concentric1893 telelens1893 telephoto1894 monocle1897 stigmat1901 stigmatic1902 Long Tom1910 zoom lens1932 Panavision1955 teleconverter1959 macro lens1961 zoom1969 macro1971 1890 Jrnl. Soc. Arts 2 May 595/1 A pair of cemented lenses could be obtained which would more nearly approach to a concentric lens. 1909 A. L. Baker Thick-lens Optics iii. 52 Concentric lens (Ross lens). 2007 M. Zahorcak in M. R. Peres Focal Encycl. Photogr. (ed. 4) 168/1 In 1889, using one of the newly developed types of glass, Ross (England) produced the Concentric lens. < as lemmas |
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