Archived posting to the Leica Users Group, 2001/05/12

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Subject: [Leica] Re: Leica Users digest V20 #4
From: Herbert & Lee Kanner <kanner@acm.org>
Date: Sat, 12 May 2001 14:06:22 -0700
References: <200105121821.LAA13047@mejac.palo-alto.ca.us>

APO, I'm not sure how to expand the acronym, it might be 
"apochromatic," means that the lens has been correct to have the same 
focal length at three wave lengths.  Achromatic means that the lens 
has the same focal length at only two wave lengths.

Herb

Reply to------------------------------------------------

Date: Sat, 12 May 2001 16:09:36 +0800
From: apbbeijing <apbbeijing@yahoo.com>
Subject: Re: [Leica] Re: Opinions on the Telyt-R 350mm 4.8 lens
Message-ID: <B7230EF1.DF48%apbbeijing@yahoo.com>
References:

>  Contains APO glass in some of its elements.

What is APO glass?

Rgds

Adrian
- -- 
Herbert Kanner
kanner@acm.org
650-326-8204