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Sigma MC-21 EF to Leica L-Mount Lens Adapter
Sigma MC-21 EF to Leica L-Mount Lens Adapter
Sigma MC-21 EF to Leica L-Mount Lens Adapter
Sigma MC-21 EF to Leica L-Mount Lens Adapter
Sigma MC-21 EF to Leica L-Mount Lens Adapter
Sigma MC-21 EF to Leica L-Mount Lens Adapter
Sigma

Sigma MC-21 EF to Leica L-Mount Lens Adapter

★★★★★4.3 (7 reviews)

Mount your Sigma EF lenses on Leica L-mount cameras with full autofocus and EXIF data support.

$269.99*
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*Price sourced from Amazon.com. Last updated:Jul 14, 2026.Price and availability are subject to change.

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Overview

The Sigma MC-21 Lens Mount Converter bridges the gap between Sigma's Canon EF mount lens lineup and Leica L-mount camera bodies such as the Panasonic Lumix DC-S1 and DC-S1R. Rather than investing in an entirely new set of native L-mount lenses, photographers can continue using their existing Sigma EF glass with retained autofocus, aperture control, and image stabilization functionality. The adapter also passes lens correction data and full EXIF metadata, so focal length, aperture, and lens identification are all recorded in your image files just as they would be with a native lens.

Build quality details include interior flocking that suppresses internal reflections and prevents stray light from degrading contrast or sharpness. A built-in tripod socket on the adapter is a thoughtful addition, providing a secure tripod mounting point for lenses that lack their own tripod collar — particularly useful with longer or heavier zoom lenses. This bundle adds practical extras including a 32GB SDHC memory card, a neoprene lens pouch for storing the adapter when not in use, and cleaning tools to keep your gear in good condition. It is important to note that the MC-21 is engineered specifically for Sigma's own EF mount lenses and is not guaranteed to work with Canon-branded or other third-party EF mount optics.

Key Features

Bundle Includes: Sigma Mc-21 Lens Mount Converter/adapter (Sigma Ef To Leica L-mount),32GB Ultra SDHC UHS-I Memory Card (100mb/s), Small Neoprene DSLR Camera Lens Pouch, Lens Cleaning Brush Cleaning Tool, and Dust Blower

Compatibility: It is compatible with Panasonic Lumix Dc-s1r and Panasonic Lumix Dc-s1

Eliminates Internal Reflections: The barrel's inside surface is covered with flocking and guards against reduced lens performance from internal reflections

Tripod Socket: The Sigma MC-21 adapter allows one to attach a tripod. This is useful when using lenses that aren't built with a tripod socket

Exif Data: Lens type, focal length, F number and other tags are embedded as Exif data in the image file

Specifications

Brand
Sigma
Model
89E969_K1
Lens Mount Compatibility
Sigma Canon EF Mount
Camera Mount Compatibility
Leica L-Mount
Internal Flocking
Yes
Tripod Socket
Yes
EXIF Data Support
Yes (focal length, F number, lens type)
Compatible Camera Bodies
Panasonic Lumix DC-S1, DC-S1R, and other L-mount bodies
Bundle Includes
MC-21 Adapter, 32GB SDHC Card, Neoprene Lens Pouch, Cleaning Brush, Dust Blower

Pros & Cons

👍 Pros

  • Enables use of Sigma EF mount lenses on Leica L-mount cameras, expanding your lens options without buying new glass
  • Built-in flocking on the interior barrel eliminates internal reflections that could degrade image quality
  • Includes a tripod socket on the adapter itself, adding tripod support for lenses that lack their own mounting collar
  • Preserves full EXIF data including focal length and aperture for accurate metadata in image files
  • Bundle includes useful accessories like a memory card, lens pouch, cleaning brush, and dust blower

👎 Cons

  • Only works with Sigma-branded Canon EF mount lenses, not with Canon or other third-party EF lenses
  • Autofocus speed may be slower compared to using lenses natively designed for the L-mount system
  • Adds length and weight between the camera body and lens, shifting the overall balance point
  • Limited to Leica L-mount bodies, so it cannot be used with other mirrorless mount systems

Frequently Asked Questions

The MC-21 is compatible with Sigma's own Canon EF mount lenses (SA-E and EF mount versions). It does not support Canon-branded EF lenses or third-party EF lenses from other manufacturers.
Yes, compatible Sigma EF lenses retain autofocus functionality when used with the MC-21 on Leica L-mount bodies, though focus speed may vary depending on the specific lens and camera combination.
Yes, lens metadata including focal length, aperture (F number), and lens type are embedded as EXIF data in image files when shooting through the MC-21.
Yes, the adapter includes a built-in tripod socket, which is especially useful when using lenses that do not have their own tripod collar.
This bundle includes the Sigma MC-21 adapter, a 32GB Ultra SDHC memory card, a small neoprene lens pouch, a lens cleaning brush, and a dust blower.

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