Which manufacturers make L-mount cameras?

Three under the L-Mount Alliance: Leica (SL3, SL2, SL2-S, CL, TL2), Panasonic (Lumix S1R II, S5 II, S5 IIX, S1H, S9), and Sigma (fp, fp L). All three ship native L-mount lenses; Sigma's L-mount Art / Contemporary / DG DN lineup is the largest by far. The alliance was announced in September 2018; the mount itself dates back to Leica's 2014 T (Typ 701) APS-C body.

Does the Sigma MC-21 preserve autofocus on Canon EF lenses for L-mount bodies?

Yes on Sigma EF-mount Art / Sports / Contemporary lenses — the MC-21 was designed primarily for Sigma's own EF glass, with full AF, IS, and electronic aperture control. Canon-brand EF lenses operate on a whitelist with degraded AF performance; check Sigma's published compatibility chart before buying. MC-21 also handles Sigma SA-mount glass (Sigma's discontinued DSLR mount) onto L-mount bodies.

Can I share lenses between a Leica SL body and a Panasonic Lumix S body?

Yes — that's the core value proposition of the L-Mount Alliance. Every native L-mount lens from Leica, Panasonic, and Sigma mounts and operates identically across all three manufacturers' bodies, including autofocus, electronic aperture, and in-lens stabilisation. Firmware on the lens itself determines the feature set; there is no body-specific licensing or lockout.

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

L-Mount on the flange-distance axis

L-Mount sits at 20 mm — highlighted in orange below. The flange-distance gap between the mirrorless and SLR clusters is the room a mechanical adapter occupies; that gap is why almost every SLR lens adapts onto every mirrorless body, and why the reverse is mechanically impossible.

Flange focal distance (mm)SLR / DSLRMirrorlessRangefinderMedium-format mirrorlessCinemaLegacy SLR

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
Body mount 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.
Body mount 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.
Body mount 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.
Body mount 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.
Body mount 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.
Body mount 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.	Speed Booster equivalence calculator Plug in any L-Mount lens and pick the focal-reducer family. The calc returns the effective focal length and aperture on a Canon RF (APS-C), plus the full-frame equivalent angle of view after the body's crop stacks on top. Lens focal length (mm)Max aperture (f/N)Focal-reducer family Effective focal length 35.5 mm 50.0 mm × 0.71 on the reducer. Effective aperture f/1.28 0.99 stops brighter than f/1.80. Full-frame equiv. angle of view 53.3 mm 35.5 mm × 1.5× (APS-C sensor crop). A focal reducer concentrates the lens's image circle, so both focal length and f-number scale by the same ratio (stops gained = `−2 · log₂(ratio)`). The body's crop factor still applies on top — the full-frame-equivalent angle-of-view multiplier is ratio × body crop. Calculator is informational; verify against the adapter vendor's per-lens compatibility chart before purchase.
Body mount 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.	Speed Booster equivalence calculator Plug in any L-Mount lens and pick the focal-reducer family. The calc returns the effective focal length and aperture on a Fujifilm GFX (G-mount) (medium-format), plus the full-frame equivalent angle of view after the body's crop stacks on top. Lens focal length (mm)Max aperture (f/N)Focal-reducer family Effective focal length 35.5 mm 50.0 mm × 0.71 on the reducer. Effective aperture f/1.28 0.99 stops brighter than f/1.80. Full-frame equiv. angle of view 28.0 mm 35.5 mm × 0.79× (medium-format sensor crop). A focal reducer concentrates the lens's image circle, so both focal length and f-number scale by the same ratio (stops gained = `−2 · log₂(ratio)`). The body's crop factor still applies on top — the full-frame-equivalent angle-of-view multiplier is ratio × body crop. Calculator is informational; verify against the adapter vendor's per-lens compatibility chart before purchase.
Body mount 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.	Speed Booster equivalence calculator Plug in any L-Mount lens and pick the focal-reducer family. The calc returns the effective focal length and aperture on a Micro Four Thirds (MFT), plus the full-frame equivalent angle of view after the body's crop stacks on top. Lens focal length (mm)Max aperture (f/N)Focal-reducer family Effective focal length 35.5 mm 50.0 mm × 0.71 on the reducer. Effective aperture f/1.28 0.99 stops brighter than f/1.80. Full-frame equiv. angle of view 71.0 mm 35.5 mm × 2× (MFT sensor crop). A focal reducer concentrates the lens's image circle, so both focal length and f-number scale by the same ratio (stops gained = `−2 · log₂(ratio)`). The body's crop factor still applies on top — the full-frame-equivalent angle-of-view multiplier is ratio × body crop. Calculator is informational; verify against the adapter vendor's per-lens compatibility chart before purchase.
Body mount 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.	Speed Booster equivalence calculator Plug in any L-Mount lens and pick the focal-reducer family. The calc returns the effective focal length and aperture on a Leica M (APS-C), plus the full-frame equivalent angle of view after the body's crop stacks on top. Lens focal length (mm)Max aperture (f/N)Focal-reducer family Effective focal length 35.5 mm 50.0 mm × 0.71 on the reducer. Effective aperture f/1.28 0.99 stops brighter than f/1.80. Full-frame equiv. angle of view 53.3 mm 35.5 mm × 1.5× (APS-C sensor crop). A focal reducer concentrates the lens's image circle, so both focal length and f-number scale by the same ratio (stops gained = `−2 · log₂(ratio)`). The body's crop factor still applies on top — the full-frame-equivalent angle-of-view multiplier is ratio × body crop. Calculator is informational; verify against the adapter vendor's per-lens compatibility chart before purchase.

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
Lens mount 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.
Lens mount Canon EF-S flange 44 mm	Mechanical AF fullIS fullAp. electronicvignettes	Sigma MC-21 EF-L	The MC-21 accepts EF and EF-S alike and passes AF, IS and electronic aperture; Sigma's own EF lenses have the widest supported list. EF-S's APS-C image circle is native on an APS-C L body (Leica CL / TL2); on a full-frame L body (SL2, Panasonic S5 II) stay in APS-C crop mode to avoid vignetting.
Lens mount Canon FD flange 42 mm	Mechanical MFno ISAp. ring	generic mechanical adapter ring (multiple vendors)	Mechanical adapter only — no electronic communication between Canon FD lens and L-Mount body.
Lens mount 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.
Lens mount 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.
Lens mount 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.
Lens mount M42 (Pentax / Praktica screw mount) flange 45.46 mm	Mechanical MFno ISAp. ring	generic mechanical adapter ring (multiple vendors)	Mechanical adapter only — no electronic communication between M42 (Pentax / Praktica screw mount) lens and L-Mount body.
Lens mount Leica M flange 27.8 mm	Mechanical MFno ISAp. ring	generic mechanical adapter ring (multiple vendors)	Mechanical adapter only — no electronic communication between Leica M lens and L-Mount body.
Lens mount 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.
Lens mount PL (Positive Lock) flange 52 mm	Mechanical MFno ISAp. 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.
Lens mount Canon EF (cine) flange 44 mm	Mechanical MFno ISAp. 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.
Lens mount Exakta flange 44.7 mm	Mechanical MFno ISAp. ring	generic mechanical adapter ring (multiple vendors)	Mechanical adapter only — no electronic communication between Exakta lens and L-Mount body.
Lens mount T-mount (T2) flange 55 mm	Mechanical MFno ISAp. ring	generic mechanical adapter ring (multiple vendors)	Mechanical adapter only — no electronic communication between T-mount (T2) lens and L-Mount body.
Lens mount Praktica B flange 44.4 mm	Mechanical MFno ISAp. ring	generic mechanical adapter ring (multiple vendors)	Mechanical adapter only — no electronic communication between Praktica B lens and L-Mount body.
Lens mount Konica AR flange 40.5 mm	Mechanical MFno ISAp. ring	generic mechanical adapter ring (multiple vendors)	Mechanical adapter only — no electronic communication between Konica AR lens and L-Mount body.
Lens mount Minolta SR / MC / MD flange 43.5 mm	Mechanical MFno ISAp. ring	generic mechanical adapter ring (multiple vendors)	Mechanical adapter only — no electronic communication between Minolta SR / MC / MD lens and L-Mount body.
Lens mount Olympus OM flange 46 mm	Mechanical MFno ISAp. ring	K&F Concept OM-LM Novoflex L-OM Fotodiox OM to L-Mount	26 mm flange clearance — generous adapter thickness on Panasonic S5/S1, Leica SL, and Sigma fp. Manual focus + manual aperture only. Panasonic L-mount bodies offer focus peaking + IBIS-assisted handheld stabilisation for vintage glass.
Lens mount Contax/Yashica (C/Y) flange 45.5 mm	Mechanical MFno ISAp. ring	generic mechanical adapter ring (multiple vendors)	Mechanical adapter only — no electronic communication between Contax/Yashica (C/Y) lens and L-Mount body.
Lens mount 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.
Lens mount 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.
Lens mount 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.
Lens mount 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.
Lens mount 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.
Lens mount 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.
Lens mount 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.
Lens mount 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.
- Firmware-updatable via the Sigma USB Dock + Sigma Optimization Pro on the lens-side mount.
Firmware history
1. v1.002019-04
  - Initial release alongside the Panasonic Lumix S1 / S1R launch
  - Sigma Global Vision EF + Sigma SA mount compatibility tables
2. v1.102019
  - Additional Sigma Art / Contemporary EF lens compatibility entries
3. v1.202020
  - Canon-brand EF lens compatibility table added (curated list)
  - Continuous-AF stability fixes on Lumix S1 / S1H
Approximate milestones — verify against the Sigma firmware page for the authoritative changelog.

References

https://l-mount.com/

Common questions

Which manufacturers make L-mount cameras?: Three under the L-Mount Alliance: Leica (SL3, SL2, SL2-S, CL, TL2), Panasonic (Lumix S1R II, S5 II, S5 IIX, S1H, S9), and Sigma (fp, fp L). All three ship native L-mount lenses; Sigma's L-mount Art / Contemporary / DG DN lineup is the largest by far. The alliance was announced in September 2018; the mount itself dates back to Leica's 2014 T (Typ 701) APS-C body.
Does the Sigma MC-21 preserve autofocus on Canon EF lenses for L-mount bodies?: Yes on Sigma EF-mount Art / Sports / Contemporary lenses — the MC-21 was designed primarily for Sigma's own EF glass, with full AF, IS, and electronic aperture control. Canon-brand EF lenses operate on a whitelist with degraded AF performance; check Sigma's published compatibility chart before buying. MC-21 also handles Sigma SA-mount glass (Sigma's discontinued DSLR mount) onto L-mount bodies.
Can I share lenses between a Leica SL body and a Panasonic Lumix S body?: Yes — that's the core value proposition of the L-Mount Alliance. Every native L-mount lens from Leica, Panasonic, and Sigma mounts and operates identically across all three manufacturers' bodies, including autofocus, electronic aperture, and in-lens stabilisation. Firmware on the lens itself determines the feature set; there is no body-specific licensing or lockout.