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Black cylindrical mount adapter with silver lens-release button and gold electronic contacts

SIGMA

SIGMA MC-21 Mount Converter SA to L-Mount #89S969

SKU CH-A0N4-5GM4G

Mount converter lets 29 Sigma SA lenses work on L-Mount cameras from Sigma, Leica and Panasonic

  • Use existing SIGMA SA lenses on L-Mount bodies
  • Access 29 SIGMA lenses via the MC-21 converter
  • Compatible with Leica L and Panasonic L-Mount cameras
  • Supports APS-C DC lenses with autocrop function
  • Extends lens investment across the L-Mount system

L-Mount compatibility for SA lenses

The SIGMA MOUNT CONVERTER MC-21 lets owners of SIGMA SA mount lenses use them on L-Mount camera bodies from SIGMA, Leica Camera and Panasonic. It extends the utility of existing lens collections by adapting them to the L-Mount system. The converter supports 29 interchangeable SIGMA lenses for L-Mount use, including DC lenses that work with the autocrop function on full-frame sensors.

Thermals noise and power draw

This passive adapter contains no electronics that generate heat, produce noise or draw power during normal operation. It functions as a mechanical and electrical interface between lens and camera body without active components. Performance depends entirely on the attached lens and camera combination.

Bundled software and accessories

No software, cables or additional accessories are included with the MC-21. The package provides only the mount converter itself, enabling immediate physical attachment of compatible SIGMA SA and CANON EF mount compatible lenses to L-Mount cameras. Firmware updates for the converter are handled through the camera body when available.

Highlights

  • Use existing SIGMA SA lenses on L-Mount bodies
  • Access 29 SIGMA lenses via the MC-21 converter
  • Compatible with Leica L and Panasonic L-Mount cameras
  • Supports APS-C DC lenses with autocrop function
  • Extends lens investment across the L-Mount system

Specifications

No published specifications for this item yet.

Questions about this item

How do I attach the MC-21 to my Sigma SA lens and L-mount camera?

Align the red dots on the lens and converter, twist until it clicks, then mount the converter to the camera body using the L-mount index.

What maintenance does the MC-21 need over time?

Keep the gold contacts clean with a dry microfibre cloth and check the bayonet pins for wear before each session.

Which aperture limit appears first when I shoot continuously with a fast Art zoom?

The lens’s own maximum aperture — for example F2.8 on the 24-70mm F2.8 DG OS HSM

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