page_title: Leica L-Mount
section_title: T-Mount to L-Mount
hierarchical_section_title: Leica L-Mount / T-Mount to L-Mount
caption_attribution_description: Deutsch: Nach der Ankündigung der L-Bajonett-Allianz durch Kazuto Yamaki (Sigma), Andreas Kaufmann (Leica Camera) und Junichiro Kitagawa (Panasonic) am 25. September auf der photokina in Köln.
context_page_description: The Leica L-Mount is a bayonet mount developed by Leica Camera AG for interchangeable-lens autofocus digital cameras.
  The L-Mount has an inner diameter of 51.6 mm and a flange depth of 20.0 mm.
  The L-mount exists in two versions, an APS-C version and a full-frame version. The two versions are mechanically and electronically compatible. TL lenses mounted on full-frame cameras will cause the camera to use a crop mode from the center of the sensor, corresponding to the APS-C coverage of the lens. SL lenses mounted on TL cameras function normally, providing a 1.5x crop field of view, as is typical with APS-C cameras.
  In 2018 Leica formed the L-Mount Alliance, licensing Sigma and Panasonic to use an upgraded version of the mount for their own products, opening the way for a more extensive system of fully compatible cameras and lenses.
context_section_description: It was introduced in April 2014 with the Leica T (Typ 701) camera. At the time of introduction, it was called the "T-mount", but this was changed to "L-mount" with the release of the Leica SL, a full-frame sensor camera using the same mount.  The Leica T was renamed to the Leica TL at this time, to permit marketing clarity for the L-mount lens line: TL lenses would cover APS-C sensors, while SL lenses would cover full-frame sensors.
  The mount is used by the Leica TL (discontinued), TL2, Leica CL (2017) and Leica SL systems. The L-Mount is a registered trademark of Leica Camera AG.
caption: Kazuto Yamaki (Sigma), Andreas Kaufmann (Leica Camera) and Junichiro Kitagawa (Panasonic) after the announcement of the L-Mount Alliance on 25 September 2018 at photokina in Cologne
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