Seneca Duo
 
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| images by Dirk HR Spennemann (Image rights) |
The Duo was a dustproof leaf shutter with slow speeds downto 1 second. The images show it with a Seneca 5×7 Rapid Rectilinear lens. It was made by Wollensak.
- Text is available under GNU Free Documentation License 1.3; other licenses apply to photos.
