Archived posting to the Leica Users Group, 2000/03/22

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Subject: [Leica] Anomalous partial dispersion
From: "Anders Nygren" <anygren@attglobal.net>
Date: Wed, 22 Mar 2000 22:56:26 -0600

Hi
Finally I got a trip from Mexico to Miami where I spent one day
visiting some camera stores. I was looking for a I thought that
I was looking for an Elmarit 90 or a Summilux 50 or a
Skopar 25 or a Heliar. But I did not find it. However I found a
APO 90 Asph. I always thought that it was MUCH to expensive
but when I saw and handled it I realised that I had to have it.
(And it is all Your collective fault, if not all the LUGGERs had raved
so much about ths lens I might have had the strengt to "just say no",
so thanks alot, I couldnīt have done it without You all.)

So well back at the hotel I saw in the instructions that two elements
have "anomalous partial dispersion", I have never heard of this
before. Can someone, maybe Erwin, explain what that is?

/Anders Nygren