Archived posting to the Leica Users Group, 1998/02/11

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Subject: [Leica] Re: Tri lens "Retrogressive?"/ Erwin / Marvin
From: Leikon35@aol.com
Date: Wed, 11 Feb 1998 16:51:18 EST

In a message dated 98-02-11 15:07:50 EST, Erwin writes:
<< 
 I wonder why a 2.8/28 is considered a slow lens and a 2.8/280 is fast one.
 I would not regard the TriElmar as retrogressive just by taking a look at
 one parameter: the full aperture value. If that were the only criterium
 consider every medium format camera hopeless out of times and unworthy 
 of any place in this high speed world.
========================================================
  >>
 Erwin - You know the answer to that as well as anyone ------------------ 
 In optical theory, a 2.8/28 lens has to be only 1" in diameter whereas
 a 2.8/280 has to be about 10" and therefore weigh a ton ------------------

 Can you imagine a 280mm Noctilux f:1 ????  28 inches in diameter !!!!
 As for medium & large format photography, the larger formats are used 
 for a different purpose than available light, which is the "forte" of Leica.

 Marvin