Difference between revisions of "Coma"
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== Description == | == Description == | ||
| − | One type of optical [http://cameo.mfa.org/materials/fullrecord.asp?name=aberration aberration] of a lens with spherical surface. When coma aberration occurs, the image cannot be focused because the light rays no longer meet at the focal plane as a point but rather as the shape of a comet. Coma is caused by various lens zones having different magnifications. A lens systems that is corrected for both [http://cameo.mfa.org/materials/fullrecord.asp?name=spherical | + | One type of optical [http://cameo.mfa.org/materials/fullrecord.asp?name=aberration aberration] of a lens with spherical surface. When coma aberration occurs, the image cannot be focused because the light rays no longer meet at the focal plane as a point but rather as the shape of a comet. Coma is caused by various lens zones having different magnifications. A lens systems that is corrected for both [http://cameo.mfa.org/materials/fullrecord.asp?name=spherical%20aberration spherical aberration] and coma for a single object position is called [http://cameo.mfa.org/materials/fullrecord.asp?name=aplanatic aplanatic]. |
== Synonyms and Related Terms == | == Synonyms and Related Terms == | ||
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* ''Van Nostrand's Scientific Encyclopedia'', Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976 | * ''Van Nostrand's Scientific Encyclopedia'', Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976 | ||
| − | * | + | * Random House, ''Webster's Encyclopedic Unabridged Dictionary of the English Language'', Grammercy Book, New York, 1997 |
* ''The American Heritage Dictionary'' or ''Encarta'', via Microsoft Bookshelf 98, Microsoft Corp., 1998 | * ''The American Heritage Dictionary'' or ''Encarta'', via Microsoft Bookshelf 98, Microsoft Corp., 1998 | ||
| − | * | + | * ASTM, Standard Terminology of Microscopy, Annual Book of ASTM Standards, Section 14, General Methods and Instrumentation, ASTM, E175, 75-78, May 1982 |
| − | * | + | * Walter C. McCrone, John Gustave Delly, ''The Particle Atlas'', W. McCrone Associates, Chicago, IV, 1972 |
[[Category:Materials database]] | [[Category:Materials database]] | ||
Revision as of 06:54, 24 July 2013
Description
One type of optical aberration of a lens with spherical surface. When coma aberration occurs, the image cannot be focused because the light rays no longer meet at the focal plane as a point but rather as the shape of a comet. Coma is caused by various lens zones having different magnifications. A lens systems that is corrected for both spherical aberration and coma for a single object position is called aplanatic.
Synonyms and Related Terms
Koma (Deut.); coma (Fr.);
Authority
- Van Nostrand's Scientific Encyclopedia, Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976
- Random House, Webster's Encyclopedic Unabridged Dictionary of the English Language, Grammercy Book, New York, 1997
- The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998
- ASTM, Standard Terminology of Microscopy, Annual Book of ASTM Standards, Section 14, General Methods and Instrumentation, ASTM, E175, 75-78, May 1982
- Walter C. McCrone, John Gustave Delly, The Particle Atlas, W. McCrone Associates, Chicago, IV, 1972