Schmidtn.

Brit.

/ʃmɪt/, U.S.

/ʃmɪt/

Origin: From a proper name. Etymon: proper name Schmidt.

Etymology: < the name of Bernhard Voldemar Schmidt (1879–1935), Estonian-born German optician.

Astronomy.

I. Compounds

1. attributive. Designating a telescope used in astrophotography, having a wide field of view and employing a correcting lens (see sense 2) at the centre of curvature of a spherical primary mirror; in Schmidt camera, Schmidt telescope.In a Schmidt telescope, the film or photographic sensor is placed inside the telescope tube, at the focal point of the correcting lens.

ΘΚΠ

the world > physical sensation > sight and vision > optical instruments > instrument for distant vision > [noun] > telescope > astronomical telescopes

stellascope1661

Schmidt camera1934

Schmidt1939

Maksutov–Cassegrain1958

Maksutov1970

Nasmyth–Cassegrain1972

Schmidt telescope1978

Dobsonian1980

1934 Carnegie Inst. Washington: Year Bk. 1933–4 33 152 (heading) A Schmidt camera for nebular spectra in the ultra-violet.

1978 Sci. Amer. Dec. 90/3 The lens of the scallop eye appears to perform much the same function as the corrector plate of the Schmidt telescope.

2004 B. Bunch & A. Hellemans Hist. Sci. & Technol. 509/2 The Schmidt telescope comes to dominate astronomy because it is free from coma, an aberration.

2. attributive. Designating an aspheric lens formed so as to counter the spherical aberrations in a spherical mirror it is placed in front of, as Schmidt correcting lens, Schmidt correcting plate, Schmidt corrector, etc.

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

1934 Carnegie Inst. Washington: Year Bk. 1933–4 33 144 The successful application by Dunham of a Schmidt correcting plate to the design of spectrographic cameras makes it especially desirable that the coudé instrument be provided with several such cameras.

1961 G. R. Miczaika & W. M. Sinton Tools of Astronomer iii. 99 (caption) Possible shapes of Schmidt correcting lenses.

1993 D. Malin View of Universe viii. 196 (caption) This is the most recent dwarf galaxy discovery, the Sextans dwarf, discovered on UK Schmidt plates by a measuring machine in Cambridge, England, in 1990.

2001 F. Watson in P. Moore 2002 Yearbk. Astron. ii. 230 In their construction, these so-called ‘classical’ Schmidts all follow a similar generic pattern (see Figure 1). The thin glass plate—the ‘Schmidt corrector’—is the heart of the system.

II. Simple uses.

3. A Schmidt telescope.

ΘΚΠ

the world > physical sensation > sight and vision > optical instruments > instrument for distant vision > [noun] > telescope > astronomical telescopes

stellascope1661

Schmidt camera1934

Schmidt1939

Maksutov–Cassegrain1958

Maksutov1970

Nasmyth–Cassegrain1972

Schmidt telescope1978

Dobsonian1980

1939 Publ. Amer. Astron. Soc. 9 255 Thus, each member of this family can be made to have the high speed of the Schmidt, but for flat-field photography.

1964 Listener 21 May 831/1 The Armagh Schmidt is employed mainly on variable star research.

2001 F. Watson in P. Moore 2002 Yearbk. Astron. ii. 230 In their construction, these so-called ‘classical’ Schmidts all follow a similar generic pattern.

This entry has been updated (OED Third Edition, June 2019; most recently modified version published online March 2022).

单词	schmidt
释义	Schmidtn. Brit. /ʃmɪt/, U.S. /ʃmɪt/ Origin: From a proper name. Etymon: proper name Schmidt. Etymology: < the name of Bernhard Voldemar Schmidt (1879–1935), Estonian-born German optician. Astronomy. I. Compounds 1. attributive. Designating a telescope used in astrophotography, having a wide field of view and employing a correcting lens (see sense 2) at the centre of curvature of a spherical primary mirror; in Schmidt camera, Schmidt telescope.In a Schmidt telescope, the film or photographic sensor is placed inside the telescope tube, at the focal point of the correcting lens. ΘΚΠ the world > physical sensation > sight and vision > optical instruments > instrument for distant vision > [noun] > telescope > astronomical telescopes stellascope1661 Schmidt camera1934 Schmidt1939 Maksutov–Cassegrain1958 Maksutov1970 Nasmyth–Cassegrain1972 Schmidt telescope1978 Dobsonian1980 1934 Carnegie Inst. Washington: Year Bk. 1933–4 33 152 (heading) A Schmidt camera for nebular spectra in the ultra-violet. 1978 Sci. Amer. Dec. 90/3 The lens of the scallop eye appears to perform much the same function as the corrector plate of the Schmidt telescope. 2004 B. Bunch & A. Hellemans Hist. Sci. & Technol. 509/2 The Schmidt telescope comes to dominate astronomy because it is free from coma, an aberration. 2. attributive. Designating an aspheric lens formed so as to counter the spherical aberrations in a spherical mirror it is placed in front of, as Schmidt correcting lens, Schmidt correcting plate, Schmidt corrector, etc. 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 1934 Carnegie Inst. Washington: Year Bk. 1933–4 33 144 The successful application by Dunham of a Schmidt correcting plate to the design of spectrographic cameras makes it especially desirable that the coudé instrument be provided with several such cameras. 1961 G. R. Miczaika & W. M. Sinton Tools of Astronomer iii. 99 (caption) Possible shapes of Schmidt correcting lenses. 1993 D. Malin View of Universe viii. 196 (caption) This is the most recent dwarf galaxy discovery, the Sextans dwarf, discovered on UK Schmidt plates by a measuring machine in Cambridge, England, in 1990. 2001 F. Watson in P. Moore 2002 Yearbk. Astron. ii. 230 In their construction, these so-called ‘classical’ Schmidts all follow a similar generic pattern (see Figure 1). The thin glass plate—the ‘Schmidt corrector’—is the heart of the system. II. Simple uses. 3. A Schmidt telescope. ΘΚΠ the world > physical sensation > sight and vision > optical instruments > instrument for distant vision > [noun] > telescope > astronomical telescopes stellascope1661 Schmidt camera1934 Schmidt1939 Maksutov–Cassegrain1958 Maksutov1970 Nasmyth–Cassegrain1972 Schmidt telescope1978 Dobsonian1980 1939 Publ. Amer. Astron. Soc. 9 255 Thus, each member of this family can be made to have the high speed of the Schmidt, but for flat-field photography. 1964 Listener 21 May 831/1 The Armagh Schmidt is employed mainly on variable star research. 2001 F. Watson in P. Moore 2002 Yearbk. Astron. ii. 230 In their construction, these so-called ‘classical’ Schmidts all follow a similar generic pattern. This entry has been updated (OED Third Edition, June 2019; most recently modified version published online March 2022). < n.1934
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