Leica Thread Mount: A screw type lens mounting style with 39mm diameter threads. Most enlarging lenses also have a 39mm thread mount.
The company's earliest cameras derived much from the design of the Leica threadmount rangefinder cameras; concerns about patents, as well as ignorance of the precise specification of the Leica thread mount, ...
[1] Canon manufactured several models from the 1930s until the 1960s; models from 1946 onwards were more or less compatible with the Leica thread mount.
 See also: Digital, Film, Focus, Function, Image
  
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