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

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Subject: [Leica] Re: Filter question
From: George Huczek <ghuczek@sk.sympatico.ca>
Date: Tue, 18 Jan 2000 05:32:13 -0600
 
At 07:58 PM 17/01/2000 -0800, you wrote:
>At 7:37 AM -0600 1/18/00, George Huczek wrote:
>>Where did the "E" designation on filter sizes originate?
>Comes from the German; 'Einschrauben', meaning 'to screw in'. As opposed to
>the 'A' filters from Leica, the 'Aufsteck' or clip on type, as in A36.
>Different 'E' type filters can have different thread pitches, as in 'E67'
>almost works in items threaded for Series VIII retaining rings.
>
What does the "S" stand for, as in the S7 filter size?