Leica launched the L-mount with their Leica T (APS-C) mirrorless, interchangeable lens  camera in 2014. It was the 100th anniversary of Oskar Barnack’s Ur-Leica. A year later, the Leica SL (Typ 601) arrived: Leica Format (36x24mm), mirrorless, autofocus, with the same mount, now renamed “L-mount.” The L-mount has a Flange Focal Depth of 20mm. The mount’s inside diameter is 51mm…. read more…