Archived posting to the Leica Users Group, 1993/04/22

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To: jeff@eng.umd.edu, leica-users@mejac.palo-alto.ca.us
Subject: Re: Summicron lens ID-6 or 7 or 8?
From: geb@dsl.pitt.edu (Gordon Banks)
Date: Thu, 22 Apr 93 12:15:03 -0400
 
Shine a light into the front of it.  Count the number of reflections
of the light you see and divide by two.  That usually works unless
some elements are cemented and have no reflective interface.