Leica / Panasonic / Sigma · Mirrorless mount

L-Mount — flange distance, protocol, and adapter compatibility

Shared mirrorless mount across Leica SL/CL, Panasonic Lumix S, and Sigma fp series under the L-Mount Alliance. 20 mm flange matches Canon RF. Sigma's MC-21 adapter brings Canon EF and Sigma SA lenses with AF; native L-mount lens count has grown rapidly since 2018.

Mount specifications

Flange focal distance: 20 mm
Throat diameter: 51.6 mm
Electronic protocol: L-Mount
Supported formats: full-frame, APS-C
Manufacturer: Leica / Panasonic / Sigma
Introduced: 2014
Status: Active production

Adapting L-Mount lenses onto other bodies

You own L-Mount glass and want to mount it on a body with a different lens mount. Rows are sorted by feasibility.

Body mount	Result	Adapter examples	Caveats
Canon EF-M flange 18 mm	Mechanical MFIS lens-onlyAp. wheel1.5× crop	generic mechanical adapter ring (multiple vendors)	Mechanical adapter only — no electronic communication between L-Mount lens and Canon EF-M body. Lens has no aperture ring; choose an adapter with a built-in aperture-control wheel.
Nikon Z flange 16 mm	Mechanical MFIS lens-onlyAp. wheel	generic mechanical adapter ring (multiple vendors)	Mechanical adapter only — no electronic communication between L-Mount lens and Nikon Z body. Lens has no aperture ring; choose an adapter with a built-in aperture-control wheel.
Sony E (incl. FE) flange 18 mm	Mechanical MFIS lens-onlyAp. wheel	generic mechanical adapter ring (multiple vendors)	Mechanical adapter only — no electronic communication between L-Mount lens and Sony E (incl. FE) body. Lens has no aperture ring; choose an adapter with a built-in aperture-control wheel.
Fujifilm X flange 17.7 mm	Mechanical MFIS lens-onlyAp. wheel1.5× crop	generic mechanical adapter ring (multiple vendors)	Mechanical adapter only — no electronic communication between L-Mount lens and Fujifilm X body. Lens has no aperture ring; choose an adapter with a built-in aperture-control wheel.
C-mount flange 17.526 mm	Mechanical MFIS lens-onlyAp. wheel2.7× crop	generic mechanical adapter ring (multiple vendors)	Mechanical adapter only — no electronic communication between L-Mount lens and C-mount body. Lens has no aperture ring; choose an adapter with a built-in aperture-control wheel.
Canon RF flange 20 mm	Speed booster MFIS lens-onlyAp. wheel	Speed Booster / focal-reducer family	Flange clearance is only 0.0 mm — a plain mechanical adapter cannot reach infinity focus; a focal reducer (Speed Booster) with optical glass is required. Speed Boosters typically widen the effective focal length (~0.71×) and add ~1 stop of light, which can be desirable on crop bodies.
Fujifilm GFX (G-mount) flange 26.7 mm	Speed booster MFIS lens-onlyAp. wheelvignettes	Speed Booster / focal-reducer family	Flange clearance is only -6.7 mm — a plain mechanical adapter cannot reach infinity focus; a focal reducer (Speed Booster) with optical glass is required. Speed Boosters typically widen the effective focal length (~0.71×) and add ~1 stop of light, which can be desirable on crop bodies.
Micro Four Thirds flange 19.25 mm	Speed booster MFIS lens-onlyAp. wheel2× crop	Speed Booster / focal-reducer family	Flange clearance is only 0.8 mm — a plain mechanical adapter cannot reach infinity focus; a focal reducer (Speed Booster) with optical glass is required. Speed Boosters typically widen the effective focal length (~0.71×) and add ~1 stop of light, which can be desirable on crop bodies.
Leica M flange 27.8 mm	Speed booster MFIS lens-onlyAp. wheel	Speed Booster / focal-reducer family	Flange clearance is only -7.8 mm — a plain mechanical adapter cannot reach infinity focus; a focal reducer (Speed Booster) with optical glass is required. Speed Boosters typically widen the effective focal length (~0.71×) and add ~1 stop of light, which can be desirable on crop bodies.

Adapting other lenses onto a L-Mount body

You own a L-Mount body and want to mount glass from other systems. Mirrorless-lens-onto-DSLR-body combinations are omitted (rear element collides with the mirror box).

Lens mount	Result	Adapter examples	Caveats
Canon EF flange 44 mm	Mechanical AF fullIS fullAp. electronic	Sigma MC-21 EF-L	MC-21 has the best AF coverage with Sigma's own EF lenses; Canon-brand EF lens support varies by model. Tamron and some older third-party EF lenses are not officially supported.
Canon EF-S flange 44 mm	Mechanical MFIS lens-onlyAp. wheelvignettes	generic mechanical adapter ring (multiple vendors)	Mechanical adapter only — no electronic communication between Canon EF-S lens and L-Mount body. Lens has no aperture ring; choose an adapter with a built-in aperture-control wheel.
Nikon F flange 46.5 mm	Mechanical MFIS lens-onlyAp. wheel	generic mechanical adapter ring (multiple vendors)	Mechanical adapter only — no electronic communication between Nikon F lens and L-Mount body. Lens has no aperture ring; choose an adapter with a built-in aperture-control wheel.
Sony A / Minolta A flange 44.5 mm	Mechanical MFIS lens-onlyAp. wheel	generic mechanical adapter ring (multiple vendors)	Mechanical adapter only — no electronic communication between Sony A / Minolta A lens and L-Mount body. Lens has no aperture ring; choose an adapter with a built-in aperture-control wheel.
Fujifilm GFX (G-mount) flange 26.7 mm	Mechanical MFIS lens-onlyAp. wheel1.27× crop	generic mechanical adapter ring (multiple vendors)	Mechanical adapter only — no electronic communication between Fujifilm GFX (G-mount) lens and L-Mount body. Lens has no aperture ring; choose an adapter with a built-in aperture-control wheel.
M42 (Pentax / Praktica screw mount) flange 45.46 mm	Mechanical MFIS lens-onlyAp. ring	generic mechanical adapter ring (multiple vendors)	Mechanical adapter only — no electronic communication between M42 (Pentax / Praktica screw mount) lens and L-Mount body.
Leica M flange 27.8 mm	Mechanical MFIS lens-onlyAp. ring	generic mechanical adapter ring (multiple vendors)	Mechanical adapter only — no electronic communication between Leica M lens and L-Mount body.
Pentax K flange 45.46 mm	Mechanical MFIS lens-onlyAp. wheel	generic mechanical adapter ring (multiple vendors)	Mechanical adapter only — no electronic communication between Pentax K lens and L-Mount body. Lens has no aperture ring; choose an adapter with a built-in aperture-control wheel.
PL (Positive Lock) flange 52 mm	Mechanical ——Ap. ring	Wooden Camera PL-L IBE Optics PL-to-L	PL flange (52 mm) on an L-mount 20 mm flange leaves 32 mm of adapter — comfortable for rigged builds on Panasonic Lumix S1H / BS1H or Sigma fp.
Canon EF (cine) flange 44 mm	Mechanical MF—Ap. electronic	Sigma MC-21 EF-L (Canon EF / Sigma SA → L-mount)	MC-21 transmits electronic aperture commands from a Panasonic / Sigma / Leica L-mount cinema body to the EF-cine iris. Focus stays fully manual; cinema bodies pulling focus via Servo or wireless FIZ work as expected.
Exakta flange 44.7 mm	Mechanical MFIS lens-onlyAp. ring	generic mechanical adapter ring (multiple vendors)	Mechanical adapter only — no electronic communication between Exakta lens and L-Mount body.
T-mount (T2) flange 55 mm	Mechanical MFIS lens-onlyAp. ring	generic mechanical adapter ring (multiple vendors)	Mechanical adapter only — no electronic communication between T-mount (T2) lens and L-Mount body.
Praktica B flange 44.4 mm	Mechanical MFIS lens-onlyAp. ring	generic mechanical adapter ring (multiple vendors)	Mechanical adapter only — no electronic communication between Praktica B lens and L-Mount body.
Konica AR flange 40.5 mm	Mechanical MFIS lens-onlyAp. ring	generic mechanical adapter ring (multiple vendors)	Mechanical adapter only — no electronic communication between Konica AR lens and L-Mount body.
Minolta SR / MC / MD flange 43.5 mm	Mechanical MFIS lens-onlyAp. ring	generic mechanical adapter ring (multiple vendors)	Mechanical adapter only — no electronic communication between Minolta SR / MC / MD lens and L-Mount body.
Canon RF flange 20 mm	Speed booster MFIS lens-onlyAp. wheel	Speed Booster / focal-reducer family	Flange clearance is only 0.0 mm — a plain mechanical adapter cannot reach infinity focus; a focal reducer (Speed Booster) with optical glass is required. Speed Boosters typically widen the effective focal length (~0.71×) and add ~1 stop of light, which can be desirable on crop bodies.
Canon EF-M flange 18 mm	Speed booster MFIS lens-onlyAp. wheelvignettes	Speed Booster / focal-reducer family	Flange clearance is only -2.0 mm — a plain mechanical adapter cannot reach infinity focus; a focal reducer (Speed Booster) with optical glass is required. Speed Boosters typically widen the effective focal length (~0.71×) and add ~1 stop of light, which can be desirable on crop bodies.
Nikon Z flange 16 mm	Speed booster MFIS lens-onlyAp. wheel	Speed Booster / focal-reducer family	Flange clearance is only -4.0 mm — a plain mechanical adapter cannot reach infinity focus; a focal reducer (Speed Booster) with optical glass is required. Speed Boosters typically widen the effective focal length (~0.71×) and add ~1 stop of light, which can be desirable on crop bodies.
Sony E (incl. FE) flange 18 mm	Speed booster MFIS lens-onlyAp. wheel	Speed Booster / focal-reducer family	Flange clearance is only -2.0 mm — a plain mechanical adapter cannot reach infinity focus; a focal reducer (Speed Booster) with optical glass is required. Speed Boosters typically widen the effective focal length (~0.71×) and add ~1 stop of light, which can be desirable on crop bodies.
Fujifilm X flange 17.7 mm	Speed booster MFIS lens-onlyAp. wheelvignettes	Speed Booster / focal-reducer family	Flange clearance is only -2.3 mm — a plain mechanical adapter cannot reach infinity focus; a focal reducer (Speed Booster) with optical glass is required. Speed Boosters typically widen the effective focal length (~0.71×) and add ~1 stop of light, which can be desirable on crop bodies.
Micro Four Thirds flange 19.25 mm	Speed booster MFIS lens-onlyAp. wheelvignettes	Speed Booster / focal-reducer family	Flange clearance is only -0.8 mm — a plain mechanical adapter cannot reach infinity focus; a focal reducer (Speed Booster) with optical glass is required. Speed Boosters typically widen the effective focal length (~0.71×) and add ~1 stop of light, which can be desirable on crop bodies.
Canon RF (cine) flange 20 mm	Speed booster MFIS lens-onlyAp. wheel	Speed Booster / focal-reducer family	Flange clearance is only 0.0 mm — a plain mechanical adapter cannot reach infinity focus; a focal reducer (Speed Booster) with optical glass is required. Speed Boosters typically widen the effective focal length (~0.71×) and add ~1 stop of light, which can be desirable on crop bodies.
C-mount flange 17.526 mm	Speed booster MFIS lens-onlyAp. wheelvignettes	Speed Booster / focal-reducer family	Flange clearance is only -2.5 mm — a plain mechanical adapter cannot reach infinity focus; a focal reducer (Speed Booster) with optical glass is required. Speed Boosters typically widen the effective focal length (~0.71×) and add ~1 stop of light, which can be desirable on crop bodies.

Adapter SKU teardown

Curated adapter SKUs that involve the L-Mount mount on either side, with the operational specifics — body-side electronic contact count, firmware-update path, weather sealing, and whether optical glass is in the path.

Sigma MC-21
released 2019
Canon EF lens → L-Mount body
- 12 body-side contacts
- firmware updatable
- not weather sealed
- no glass — pass-through
- Sigma's bridge from Canon EF + Sigma SA into the L-Mount Alliance ecosystem (Leica SL / CL, Panasonic Lumix S, Sigma fp).
- Best with Sigma's own EF Art / Contemporary / Sports lenses; Canon-brand EF compat is curated and listed on Sigma's published chart.

References

https://l-mount.com/

Mount specifications

Adapting L-Mount lenses onto other bodies

Adapting other lenses onto a L-Mount body

Adapter SKU teardown

Sigma MC-21

References

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