B&L Iris Diaphragm Shutter

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The Iris Diaphragm Shutter of 1891 was the first of Bausch & Lomb's characteristic series of two-piston multi-speed brass shutters with iris diaphragm for standard camera lenses. It has an f-stop and shutter speed setting device on top that reminds of a clock or a ship's machine telegraph. It was invented by Edward Bausch, George Hommel, and Andrew Wollensak.[1] This brass shutter was also made in an aluminium version.[2] The predecessing version of 1888, invented by Edward Bausch, had only one piston for remote shutter release tube connection, and no shutter speed setting scale.[3]

Notes

  1. 1891 version, see Iris Diaphragm Shutter, 1891-type, Brass - c. 1896 on piercevaubel.com
  2. Alu variant, see Aluminum Iris Diaphragm Shutter - c. 1900 on piercevaubel.com
  3. 1888 version, see Iris Diaphragm Shutter, 1888-type, Brass - c. 1889 on piercevaubel.com
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