Difference between revisions of "Coma"
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== Description == | == Description == | ||
| − | One type of optical [ | + | 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 == | == Synonyms and Related Terms == | ||
Revision as of 10:11, 13 January 2014
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