Archived posting to the Leica Users Group, 1998/06/07

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Subject: Re: [Leica] reply: APO
From: Eric Welch <>
Date: Sun, 07 Jun 1998 20:18:49 -0500

At 12:12 AM 6/8/98 +0200, you wrote:

>zones. If Eric implies that a lens can be fully apochromatically corrected
>in the centre and be non- or partially-apochromatically corrected in the
>outer zones, I at least must pass.

Well, I'm talking about Sigma. :-) 

>in an earlier post, but I was to hasty in my wording). What I meant to say
>is that some glasses have characteristics that can advantageously be used
>in combination with others to create APO correction.

That's what I thought you meant. Your explanations have been exceptionally
good and useful. Thanks.
- --

Eric Welch
St. Joseph, MO

If you are out to describe the truth, leave elegance to the tailor.

Albert Einstein