Sigma MC-21 & MC-31: SA, EF and PL glass on L-mount

Sigma's MC-21 brings Sigma-made SA-mount and EF-mount lenses to L-mount bodies with single-shot autofocus (AF-S works; AF-C does not). The MC-31 is the purely mechanical PL cine adapter — manual everything, with shim-adjustable back focus.

Last verified 2026-08-14 · every claim below links its manufacturer source

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Adapter	Mounts	Autofocus (maker's wording)	Buy
Sigma Mount Converter MC-21	Sigma SA / Canon EF (Sigma-made EF-mount lenses only) → L-mount	limited (Sigma, verbatim: 'High precision AF photography in AF-S mode is achieved. Note: Not compatible with AF-C mode.') Limitation: Officially supports SIGMA lenses only (not Canon-brand EF lenses); AF-C unavailable; Touch AF and continuous AF in video unavailable on Panasonic bodies manufacturer source ↗	Amazon →
Sigma Mount Converter MC-31	PL (Arri) → L-mount	none (purely mechanical cine adapter; Sigma page makes no AF claims — PL cine lenses are manual focus; features shim adjustment and all-metal construction) Limitation: Manual focus/aperture only; designed around Sigma fp (screw-thread body securing); shim adjustment required for back-focus accuracy manufacturer source ↗	Amazon →

Check the Sigma Mount Converter MC-21 price on Amazon →

Or skip the adapter: native L-Mount lenses

Adapting is a bridge, not a destination — the native range may already cover you. Every L-Mount lens that fits without an adapter: the L-Mount lens index, organized by focal length, aperture and use.

Does autofocus work with a Sigma MC-21 adapter?

Sigma Mount Converter MC-21: limited. Sigma Mount Converter MC-31: none.

Which lenses does the sigma mc-21 adapter unlock?

Sigma SA / Canon EF (Sigma-made EF-mount lenses only) lenses become mountable on L-mount bodies. See the full L-Mount native-lens index for what fits without an adapter.

Sources: Sigma Mount Converter MC-21 · Sigma Mount Converter MC-31 — fetched and verified 2026-08-14. All mount adapters · Methodology