Archived posting to the Leica Users Group, 1998/12/16

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Subject: Re: [Leica] Viewing filter for B&W tonal values
From: Randolph Carlisle <omegaman@shentel.net>
Date: Wed, 16 Dec 1998 21:06:19 -0800
 
The viewing filter you seek is a Wratten #90.  Picker (Zone VI) put it
in black plastic frames with the dimensions of 4x5 and 35mm.
RC