Which L-Mount bodies support the MC-21 with full AF?

Panasonic Lumix S1 / S1R / S1H / S5 series, every Sigma fp variant, and Leica SL2 / SL3. AF is most polished on the Lumix S5 / S1H pairing.

Can the MC-21 mount Sigma SA-mount lenses as well as Canon EF?

Sigma sells two physical variants: MC-21 EF (takes Canon EF + Sigma Global Vision EF) and MC-21 SA (takes Sigma SA-mount glass). Pick the one matching your lens collection.

Does it work with Sony or Canon mirrorless bodies?

No — L-Mount is the body-side mount, so the MC-21 only fits L-Mount Alliance bodies (Leica / Panasonic / Sigma). For Sony E-mount use the Sigma MC-11 instead.

Sigma · Canon EF → L-Mount adapter

Sigma MC-21 — Canon EF → L-Mount adapter

Sigma's bridge from Canon EF + Sigma SA into the L-Mount Alliance ecosystem (Leica SL / CL, Panasonic Lumix S, Sigma fp).

At a glance

Vendor: Sigma
Release year: 2019
Body-side contacts: 12 pins
Flags: firmware-updatableweather-sealed —requires glass —

What this adapter preserves

Compatibility for Canon EF lens on a L-Mount body (computed from the lensmount dataset — open the Canon EF to L-Mount adapter page for the full verdict, flange clearance, and adapter caveats).

Focus: Full AF
IS: IS / IBIS preserved
Aperture: Electronic aperture
Infinity focus: Reaches infinity

What it does

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

v1.002019-04
- Initial release alongside the Panasonic Lumix S1 / S1R launch
- Sigma Global Vision EF + Sigma SA mount compatibility tables
v1.102019
- Additional Sigma Art / Contemporary EF lens compatibility entries
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.

Specific lens compatibility

Per-lens notes for the Sigma MC-21 based on the vendor's published compatibility chart and community-tested behaviour. Three states: works (✓) — full AF / IS / aperture behave as native; partial (⚠) — usable with a documented caveat; issue (✗) — known incompatibility or rough edge.

Lens	Status	Note
Sigma 24-70 mm f/2.8 DG OS HSM Art (EF)	Works	Full AF, OS pass-through, electronic aperture on Lumix S5 / S1H. One of the smoother MC-21 pairings.
Sigma 150-600 mm f/5-6.3 DG OS HSM Contemporary (EF)	Works	AF holds for static and slow-tracking work on Lumix S1H; v1.20 firmware stabilised continuous-AF behaviour.
Canon EF 24-70 mm f/2.8L II USM	Partial	Added to the Canon-brand chart in v1.20. Single-shot AF is reliable; subject tracking is noticeably slower than on a Lumix-native S Pro lens.
Tamron 70-200 mm f/2.8 Di VC USD G2 (EF)	Issue	Not certified on the MC-21 — Sigma's compat list is narrower for Tamron on L-Mount than on Sony. Expect inconsistent AF and unreliable VC pass-through.

Common questions

Which L-Mount bodies support the MC-21 with full AF?: Panasonic Lumix S1 / S1R / S1H / S5 series, every Sigma fp variant, and Leica SL2 / SL3. AF is most polished on the Lumix S5 / S1H pairing.
Can the MC-21 mount Sigma SA-mount lenses as well as Canon EF?: Sigma sells two physical variants: MC-21 EF (takes Canon EF + Sigma Global Vision EF) and MC-21 SA (takes Sigma SA-mount glass). Pick the one matching your lens collection.
Does it work with Sony or Canon mirrorless bodies?: No — L-Mount is the body-side mount, so the MC-21 only fits L-Mount Alliance bodies (Leica / Panasonic / Sigma). For Sony E-mount use the Sigma MC-11 instead.

Mounts on either side

Lens side

Canon EF

Flange 44 mm · Canon

Open mount page →

Body side

L-Mount

Flange 20 mm · Leica / Panasonic / Sigma

Open mount page →

Other adapters worth comparing

Keep exploring

Back to every adapter we track, or jump to the full cross-brand compatibility matrix. Need a kit recommendation? Open the adapter picker.