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PLOOT is the designation used by Leitz for an early accessory reflex finder, announced 1934-5,[1][2] which adapts one of their screw-mount rangefinder cameras into an approximation of an SLR. The device comprises a mirror, set in the optical path, which directs the image-forming light from the lens upward to a ground-glass focusing screen, with a vertically-mounted viewfinder eyepiece. The mirror is swung up out of the light-path just before exposure, using a double cable-release.[1] The PLOOT is used with telephoto and macro lenses, which are a range made specially for the system, in tubes allowing for the extra depth of the mirror-box on the front of the camera body. For shorter lenses, this extra depth would make focusing to useful distances impossible; however, critical ground-glass focusing is undoubtedly most useful with long lenses.

The PLOOT was superceded by several generations of Visoflex housing.


  1. 1.0 1.1 A set comprising a Telyt 20 cm f/4.5, serial no. 230214 and PLOOT housing, with double cable release, sold at the first Westlicht Photographica Auction, on 15 November 2002, dated to 1934 by the auctioneer.
  2. French Patent 782058 (filed 1934 and granted 1935 to Ernst Leitz GmbH), Appareil photographique, at Espacenet, the patent search facility of the European Patent Office.