underfocusn.

Etymology: under- prefix¹ 5.Previous versions of the OED give the stress as: underˈfocus.

The situation in which the beam of an electron microscope is focused to a point somewhat short of the specimen.

ΘΚΠ

the world > physical sensation > sight and vision > optical instruments > magnification or magnifying instruments > [noun] > microscope > electron microscopes > underfocus

underfocus1971

underfocusing1971

1971 Jrnl. Physics A 4 806 These large phase shifts can be exactly cancelled by underfocus of the objective lens.

1979 Nature 17 May 227/1 The contrast of the images taken from very thin parts of crystal at about 700 Å underfocus is known to reflect approximately the projection of the structure; the dark dots show the sites of Re ions.

Derivatives

underˈfocused adj.

ΘΚΠ

the world > physical sensation > sight and vision > optical instruments > magnification or magnifying instruments > [adjective] > microscope > parts of

cardioid1910

underfocused1953

eucentric1973

1953 C. E. Hall Introd. Electron Microsc. x. 268 The pattern appearing at the screen is an underfocused image.

underˈfocusing n.

ΘΚΠ

the world > physical sensation > sight and vision > optical instruments > magnification or magnifying instruments > [noun] > microscope > electron microscopes > underfocus

underfocus1971

underfocusing1971

1971 Jrnl. Physics A 4 806 This underfocusing will produce a large chromatic aberration effect.

This entry has not yet been fully updated (first published 1986; most recently modified version published online June 2019).

单词	underfocus
释义	underfocusn. Etymology: under- prefix¹ 5.Previous versions of the OED give the stress as: underˈfocus. The situation in which the beam of an electron microscope is focused to a point somewhat short of the specimen. ΘΚΠ the world > physical sensation > sight and vision > optical instruments > magnification or magnifying instruments > [noun] > microscope > electron microscopes > underfocus underfocus1971 underfocusing1971 1971 Jrnl. Physics A 4 806 These large phase shifts can be exactly cancelled by underfocus of the objective lens. 1979 Nature 17 May 227/1 The contrast of the images taken from very thin parts of crystal at about 700 Å underfocus is known to reflect approximately the projection of the structure; the dark dots show the sites of Re ions. Derivatives underˈfocused adj. ΘΚΠ the world > physical sensation > sight and vision > optical instruments > magnification or magnifying instruments > [adjective] > microscope > parts of cardioid1910 underfocused1953 eucentric1973 1953 C. E. Hall Introd. Electron Microsc. x. 268 The pattern appearing at the screen is an underfocused image. underˈfocusing n. ΘΚΠ the world > physical sensation > sight and vision > optical instruments > magnification or magnifying instruments > [noun] > microscope > electron microscopes > underfocus underfocus1971 underfocusing1971 1971 Jrnl. Physics A 4 806 This underfocusing will produce a large chromatic aberration effect. This entry has not yet been fully updated (first published 1986; most recently modified version published online June 2019). < n.1953
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