afocaladj.

Brit.

/eɪˈfəʊkl/, U.S.

/eɪˈfoʊk(ə)l/

Origin: Formed within English, by derivation. Etymons: a- prefix⁶, focal adj.

Etymology: < a- prefix⁶ + focal adj.

Optics.

Of a lens or other optical system: that transfers an image without bringing it to a focus, i.e. so that rays entering parallel emerge parallel; relating to or constituting such a system.

ΘΚΠ

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

1887 Proc. Royal Soc. 42 50 If the lenses are nearly but not quite in the afocal position, greater power and a wider field may be obtained.

1911 Astrophysical Jrnl. 33 407 The interference apparatus is placed at the end of the telescope, set upon the nebula for an eye focused for infinity and consequently forming an afocal system.

1932 H. H. Emsley & W. Swaine Ophthalmic Lenses (ed. 2) xvii. 294 The two surfaces of this central portion of the glass are practically concentric..so that the glass itself is afocal.

1973 Physics Bull. July 440/3 Afocal systems such as telescopes, binoculars and periscopic sights.

2007 M. A. Covington Digital SLR Astrophotogr. iii. 32 Another way to eliminate vibration almost completely is to use afocal coupling (that is, aim the camera into the telescope's eyepiece).

This entry has been updated (OED Third Edition, September 2012; most recently modified version published online December 2021).

单词	afocal
释义	afocaladj. Brit. /eɪˈfəʊkl/, U.S. /eɪˈfoʊk(ə)l/ Origin: Formed within English, by derivation. Etymons: a- prefix⁶, focal adj. Etymology: < a- prefix⁶ + focal adj. Optics. Of a lens or other optical system: that transfers an image without bringing it to a focus, i.e. so that rays entering parallel emerge parallel; relating to or constituting such a system. ΘΚΠ 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 1887 Proc. Royal Soc. 42 50 If the lenses are nearly but not quite in the afocal position, greater power and a wider field may be obtained. 1911 Astrophysical Jrnl. 33 407 The interference apparatus is placed at the end of the telescope, set upon the nebula for an eye focused for infinity and consequently forming an afocal system. 1932 H. H. Emsley & W. Swaine Ophthalmic Lenses (ed. 2) xvii. 294 The two surfaces of this central portion of the glass are practically concentric..so that the glass itself is afocal. 1973 Physics Bull. July 440/3 Afocal systems such as telescopes, binoculars and periscopic sights. 2007 M. A. Covington Digital SLR Astrophotogr. iii. 32 Another way to eliminate vibration almost completely is to use afocal coupling (that is, aim the camera into the telescope's eyepiece). This entry has been updated (OED Third Edition, September 2012; most recently modified version published online December 2021). < adj.1887
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