Universal Screw Mount: A style of lens mounting once used by Pentax, Praktica and other camera makers. The universal screw mount has 42mm diameter threads on the lens mount.
The M42 threaded mount (the "universal screw mount" popularized by the Pentax Spotmatic camera) is similar to the Tamron T-mount - both mounts are 42mm in diameter. However, M42 lenses use 1mm threads and T-mounts use 0.75mm threads.
 See also: Sensor, Back, Optics, Stops, Photograph
  
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