Logo of the L-mount alliance
|Type||Bayonet, digital interface|
|Inner diameter||51.6 mm|
|Connectors||10 electrical pins|
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 (TL) and a full-frame version (SL). 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.
- 1 T-Mount to L-Mount
- 2 L-Mount Alliance
- 3 Cameras
- 4 Lenses
- 5 Lens adapters
- 6 Notes
T-Mount to L-Mount
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.
On 25 September 2018, the L-Mount Alliance between Leica, Panasonic and Sigma was announced, enabling the partners "to make use of the L-Mount standard developed by Leica for their own developments and to offer both cameras and lenses utilising this lens mount" with full compatibility between the three companies' products.
According to Sigma CEO, Kazuto Yamaki, the "L-mount system is not exactly the same as the existing one. We updated it a little bit to work better with such lenses through lens adapters."
Sigma announced that it will launch a full-frame camera in 2019, using the L-Mount and the company's Foveon sensor, as well as a range of L-mount lenses and adapters for Sigma SA and Canon EF lenses.
Six cameras and 39 native lenses are confirmed for the L-Mount by 2020.
Leica T/TL cameras use APS-C sensors. The TL mount version is not dust- or splashproof.
Leica SL cameras use full-frame sensors. The SL version is dust- and splashproof.
Leica has an existing range of fifteen L-Mount lenses.
Panasonic committed to releasing a total of ten lenses for the L-mount by the end of 2020, beginning with the 50mm F/1.4 prime and the two zooms listed below; stating that they would provide details at Photokina 2019. 
Sigma plans to release a wide range of lenses. 14 primes from Sigma's 'Global Vision' range, primarily designed for reflex cameras with short flange depths and currently available for the mirrorless Sony E-mount, will also be released in L-Mount from 2019. These will be followed by a range designed specifically for mirrorless parameters.
- Leica APO-Macro-Elmarit-TL 1:2.8 / 60 ASPH
- Leica Summilux-TL 1:1.4 / 35 ASPH
- Leica Summicron-TL 1:2 / 23 ASPH
- Leica Elmarit-TL 1:2.8 / 18 ASPH
- Sigma 16mm f/1.4 DC DN Contemporary
- Sigma 30mm f/1.4 DC DN Contemporary
- Sigma 56mm f/1.4 DC DN Contemporary
- Leica Super-Vario-Elmar-TL 1:3.5-4.5 / 11-23 ASPH
- Leica Vario-Elmar-TL 1:3.5-5.6 / 18-56 ASPH
- Leica APO-Vario-Elmar-TL 1:3.5-4.5 / 55-135 ASPH
- Leica Summilux-SL 1:1.4 / 50 ASPH
- Leica APO-Summicron-SL 1:2 / 75 ASPH
- Leica APO-Summicron-SL 1:2 / 90 ASPH
- Leica APO-Summicron-SL 1:2 / 35 ASPH
- Leica APO-Summicron-SL 1:2 / 50 ASPH
- Panasonic LUMIX S PRO 50mm f/1.4
- Sigma 14mm f/1.8 DG HSM Art
- Sigma 20mm f/1.4 DG HSM Art
- Sigma 24mm f/1.4 DG HSM Art
- Sigma 28mm f/1.4 DG HSM Art
- Sigma 35mm f/1.4 DG HSM Art
- Sigma 40mm f/1.4 DG HSM Art
- Sigma 50mm f/1.4 DG HSM Art
- Sigma 70mm f/2.8 DG MACRO Art
- Sigma 85mm f/1.4 DG HSM Art
- Sigma 105mm f/1.4 DG HSM Art
- Sigma 135mm f/1.8 DG HSM Art
- Leica Vario-Elmarit-SL 1:2.8-4 / 24-90 ASPH
- Leica APO-Vario-Elmarit-SL 1:2.8-4 / 90-280
- Leica Super-Vario-Elmar-SL 1:3.5-4.5 / 16-35 ASPH
Manual third-party lenses are being produced in L-mount by 7Artisans (Photoelectric series), Meyer-Optik (Gorlitz series), and Kipon HandeVision (IBELUX and IBERIT series').
- Leica R-Adapter L
- Leica S-Adapter L
- Leica M-Adapter L
- Leica PL-Adapter L
- Novoflex SL-EOS Adapter 
- Novoflex SL/NIK Adapter
- Sigma SA-L adapter
- Sigma EF-L adapter Sigma-manufactured 'Global Vision' EF-mount lenses are fully supported and compatible; although non-Sigma EF-mount lenses remain unguaranteed.
- Leica SL Details. Manufacturer's website. Visited 2 June 2017.
- Etchells, Dave (2 October 2018). "Sigma interview at Photokina 2018: CEO Kazuto Yamaki gives us a peek inside the L-mount alliance". Imaging Resource. Retrieved 7 October 2018.
- "New Leica TL System announced". Leica Forum Blog. 2016-11-08. Retrieved 2018-07-24.
- Goldstein, Mark. "L-Mount Alliance Between Leica, Panasonic and Sigma Officially Announced". Photography Blog. Retrieved 25 September 2018.
- Goldstein, Mark. "Panasonic S1R and Panasonic S1 35mm Full-frame Mirrorless Cameras". Photography Blog. Retrieved 25 September 2018.
- Butler, Richard. "Sigma to take Foveon full frame and adopt L mount". DPReview. Retrieved 26 September 2018.
- "Leica SL lenses". Leica Company Website. Leica Camera AG. Retrieved June 12, 2017.
- PanasonicLumixVideo channel
- on YouTube
- Keller, Jeff (September 25, 2018). "Panasonic developing two full-frame mirrorless cameras with Leica L-mount". DPReview. Retrieved January 25, 2019.
- "Panasonic Launches Three L-Mount Interchangeable Lensesfor the LUMIX SSeries Full-frame Digital Single Lens Mirrorless Camera" (PDF). Panasonic Global Website. Panasonic Corporation. February 1, 2019. Retrieved March 2, 2019.
- "Adapter-Finder of Novoflex". Novoflex Company Website. Novoflex. Retrieved June 12, 2017.
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