Archived posting to the Leica Users Group, 2000/01/18

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Subject: [Leica] Filter question
From: George Huczek <ghuczek@sk.sympatico.ca>
Date: Tue, 18 Jan 2000 07:37:02 -0600
 
Where did the "E" designation on filter sizes originate?  

I also would like to know how the "E" designation translates to standard
filter sizes.  For example, with a lens that takes an E60 filter, does that
mean that any 60mm thread mount filter is compatible or would they be
different.