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

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Subject: Re: [Leica] Apocromats
From: TEAShea <>
Date: Mon, 4 May 1998 09:44:23 EDT

 If apocromats are lenses which have been corrected so that the three primary
 colors are in focus on the same plane, then why are there no short focal
 length apocromats, e.g. under 100mm in 35mm format? >>

Chromatic abberation is less noticable at medium focal lenths.  It becomes
more evident at longer focal lengths.  

Tom Shea