Archived posting to the Leica Users Group, 2004/02/03
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]From the Tamron site: > <What is (Anomalous Dispersion) > > Anomalous Dispersion glass is a type of optical glass material that > delivers an abnormally larger partial dispersion ratio (amount of > dispersion at a given wavelength area within visible light range) > relative to a specific wavelength zone. Combined use of AD glass with > other optical glass material(s) of different dispersion > characteristics serves the purpose of optimizing the dispersion > character of an optical system at a specific wavelength. Thus, it > helps to compensate for on-axis chromatic aberration on telephoto > lenses, or for lateral chromatic aberration on wideangle lenses. I still don't know what it means though... John Collier On Feb 3, 2004, at 4:05 PM, Stan Yoder wrote: > Pardon my iggerance, but what is that (in lay terms, if poss.)? It's > mentioned in describing the new Vario-Elmarit R 28-90 in the current > "Viewfinder." - -- To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html