the Monocular Duplex, one of the earliest SLR (by Calvin Rae Smith , patent 1884) on the Public Address [1]
Glossary Terms
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^ One was patented in 1861 (Thomas Sutton), but it is not clear if a second example was ever produced; Calvin Rae Smith's design of a Patent Monocular Duplex camera was advertised and sold. Spira, The History of Photography, 119.
^ A. O.
This device allows you to attach these monocular optics (Swarovski brand) to a camera with a threaded lens front, including non-interchangeable-lens compacts and DSLRs (50mm lens preferred).
 See also: Sensor, Focus, Photograph, Image, Lens
  
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