Archived posting to the Leica Users Group, 1998/05/04

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Subject: Re: [Leica] Apocromats
From: "Henning J. Wulff" <henningw@archiphoto.com>
Date: Mon, 4 May 1998 22:45:53 -0700
 
>> If apocromats are lenses which have been corrected so that the three primary
>
>Just for clarity sake, let's make a distinction between APO lenses, and
>achromats. (Not a misspelling there). Achromats are two-element lenses,
>such as Elpro elements and the 400 and 560 6.8 lenses.

Achromats are lenses which are corrected for longitudinal chromatic
aberrations to bring two colors in the visible spectrum to the same focal
plane, whether they have 2 elements or a dozen.


   *            Henning J. Wulff
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