Archived posting to the Leica Users Group, 2004/02/04
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It means the optics are going to be exceptionally excellent. Or, One Killer
of a Lens.
Gene
John Collier
<jbcollier@shaw.ca> To: leica-users@mejac.palo-alto.ca.us
Sent by: cc:
owner-leica-users@mejac.palo Subject: Re: [Leica] Anomalous Partial Dispersion
-alto.ca.us
02/03/2004 05:39 PM
Please respond to
leica-users
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."
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