March 1914, Wetzlar. Oskar Barnack completes the prototype of his Liliput camera, the “Ur-Leica. It shoots 36×24 mm (Full Frame) stills, using 35mm cine film positioned horizontally. March 1925. The Leica I begins serial production and is introduced at the Leipzig Fair. The format is called Leica Format. 1930: the Leica I gets a 39 mm diameter threaded mount for interchangeable lenses and looking back, can be called a primordial  ILMC—Interchangeable Lens Mirrorless Camera. 1932: the Leica model C standardizes on a Flange Focal Depth of  28.8 mm. 1954. The first M series Leica Camera, with a bayonet mount, is introduced at Photokina. Flange Focal Depth is now 27.8 mm and the mount’s Inside Diameter is 44 mm. July 2020: Leica Camera introduces the latest in their long line of M cameras–the M10-R has a new 40 Megapixel sensor.

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