Archived posting to the Leica Users Group, 2000/08/05

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Subject: Re: [Leica] 50/1.2 or 50/1.5 or 50/2?!
From: Krechtz@aol.com
Date: Sat, 5 Aug 2000 16:44:21 EDT
 
In a message dated 8/5/00 3:53:45 PM Eastern Daylight Time, 
henningw@archiphoto.com writes:

<< That's the real test of the effective relative
 aperture, or 't-stop'. >>

For more on T-stops or T-numbers and related topics, see the Focal 
Encyclopedia of Photography.  In the 3rd Edition (1993), check p. 791.  I was 
looking for the name Cooke, which I remember as the name of the optical firm 
which developed lenses calibrated in T-stops.  There may have been others 
unknown to me.

Joe Sobel