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#1 |
Senior Member
Join Date: Jan 2004
Location: Juneau, Alaska
Posts: 474
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Anomalous Dispersion
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#2 | |
Senior Member
Join Date: Sep 2005
Location: Washington, DC, Metro Area, Maryland
Posts: 13,826
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Imacer wrote:
Quote:
dispersion4 : the seperation of light into colors by refraction or diffraction with formation of a spectrum; also : the seperation of nonhomogeneous radiation into components in accordance with some characteristic (as energy) anomalous dispersion 1 : an unusual dispersion of light into colors; or : a dispersion of light into unusual colors2 : a physical impossibility 3 : a meaningless assemblage of words intended to impress and confuse the casual reader. See political writingorcosmetics advertisements. |
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#3 |
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Join Date: Jan 2006
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Could you give the context in which the term was used? It could be just poor translation of the term "chromatic aberration".
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#4 |
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Join Date: Jan 2004
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It's a way of helping to correct Chromatic Aberration; from Tamron's website:
" [align=left]About AD (Anomalous Dispersion) Lens Elements[/align] [align=justify]Anomalous Dispersion glass is a special optical glass that delivers an abnormally large partial dispersion ratio (amount of dispersion at a given wavelength range within visible light) relative to a specific wavelength zone. By combining AD glass elements with elements made of normal glass with different dispersion characteristics, dispersion factors of a specific wavelength can be controlled, resulting in effective compensation of on-axis chromatic aberration on telephoto lenses, or lateral chromatic aberration often associated with wideangle lenses of conventional optical configuration. (Model 190D)[/align] [align=justify]The difference in partial dispersion factors between normal optical glass and AD glass elements[/align][align=justify] [/align][align=justify] ![]() [/align][align=justify] [/align] |
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