The M mount In 1954, Leica launched the M3 rangefinder camera, which featured a new bayonet lens mount, a high magnification viewfinder, as well as an improved film transport. This was the beginning of the M System we know today. The Leica IIIg, which was launched in 1957, was the last thread mount camera that Leica offered. However, it is important to note that the new M mount did not spell an end to the now ubiquitous Leica Thread Mount (LTM) lenses. Instead of being an obsolete system, LTM lenses can be mounted on M mount cameras via thread to …
