BFOOX BY ANOTHER NAME

The BFOOX #51882 negative and positive film viewer is shown on pages 235-237 of my Volume III-Accessories. Leica Photography April 1936 announced this device. 1934 advertising exists in the French language where the nomenclature is VISO. This assembly was especially convenient for the advanced film laboratory.

 
 
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CAP TYPE VIEWFINDER MASK FOR 13.5CM ELMAR

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Oskar Barnack: From the Idea to the Leica