| 单词 | achromat lens |
| 释义 | > as lemmasachromat lens An achromatic lens. Also achromat lens. 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 1873 Overland Monthly Feb. 174/2 Our lenses penetrate substances previously supposed to be opaque. Our achromats have been able to perceive the billows upon star-beaches. 1900 S. P. Thompson tr. O. Lummer Contrib. Photogr. Optics vii. 41 These two-lens combinations corrected in this sense achromatically and spherically we shall henceforth call achromats. 1942 J. Mitchell Ilford Man. Photogr. i. 20 The maximum aperture at which a single achromat can be used is about f/14. 1982 N.Y. Times 4 July ii. 24/6 There are two types of telescopes suited to this kind of photography: refractors which use a two-element achromat lens, and reflectors, utilizing a highly polished precision ground mirror. 1995 Sky & Telescope May 35 (advt.) A relatively short focus objective that is superior to long focus achromats in contrast and definition of subtle planetary detail. < as lemmas |
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