The L-Mount is a lens mount for mirrorless autofocus system cameras that was launched by Leica for an APS-C system in 2014 with the Leica T and, in 2015, for a full-frame system, the Leica SL.
It is equally suitable for both APS-C format and full-frame cameras. The advantages are a large inner diameter of 51.6 mm that enables the realisation of extremely fast lenses and, at the same time, extremely compact dimensions that permit the construction of compact APS-C format system cameras.
The configuration of the lens-to-camera communication interface is future-proof and, as realised in the case of the Leica SL, the L-Mount also offers an option for the construction of sealed systems that are insensitive to dust and moisture. The register of the L-Mount is 20 mm, and allows the mounting of a multitude of different lenses by means of appropriate adapters.