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M-mount is a bayonet-type lens mount known mostly from rangefinders manufactured by Leica, although during the film days it was one of few open standards with many manufacturers developing lenses and cameras for the M-mount.

M-mount is a bayonet-type lens mount known mostly from rangefinders manufactured by Leica, although during the film days it was one of few open standards with many manufacturers developing lenses and cameras for the M-mount.

Leica M-mount is described by patents: no. 2,038,261 no. 2,643,581 no. 695,397

  • Flange focal distance: 27,8mm
  • Diameter: 44mm

Bayonet on the lens:

M-mount lens