Archived posting to the Leica Users Group, 2002/04/02

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Subject: [Leica] Telyt 400/5.6
From: "Frank Filippone" <>
Date: Tue, 2 Apr 2002 23:26:40 -0800

I just read that this lens is a 2 element design....     It also has a
wonderful following among the knowledgeable.  If the lens is truly a 2
element design, part of te successful imaging quality of the lens is due to
the limited air to air spacing.. Each lens to air space acts as a parial
mirror, causing loss of contrast and reducing imaging accuracy.  The succes
to some extent, is due to its very simple design.

Back to basics.. you want a good lens, use a simple design.

Frank Filippone

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