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Sigma Mount Converter MC-21, Sigma SA-L to SA Mount, Increases Lens Compatibility

SIGMA

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SKU

SIG89S969

$189.00

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Key Features

Lens Compatibility: Mount Sigma SA and Canon EF lenses on L-Mount bodies.
Autofocus Support: Fast, accurate AF in AF-S mode, with manual focus available.
Pre-loaded Lens Data: Optimizes AF, aperture control, and in-camera corrections for supported lenses.
EXIF Preservation: Lens type, focal length, aperture and related metadata preserved in images.
Tripod Socket: Built-in 1/4 Inch-20 tripod mount protects the camera-lens junction with heavy lenses.
Low-Reflection Interior: Flocked barrel reduces internal reflections for improved contrast.

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Sigma Mount Converter MC-21, Sigma SA-L to SA Mount, Increases Lens Compatibility Overview

Description

The SIGMA MC-21 is a purpose-built mount converter that extends the life and usability of existing Sigma SA and Canon EF lens collections by allowing them to perform on L-Mount cameras with preserved metadata and optimized lens behavior. Designed with professional workflows in mind, the MC-21 balances compact size, firmware upgradeability, and mechanical strength for reliable field use.

Problem

Users migrating to L-Mount systems often face the cost and disruption of replacing established lens inventories, inconsistent AF performance with third-party adapters, and loss of metadata that complicates post-production. The MC-21 addresses these problems by providing an official Sigma solution with pre-loaded lens profiles, EXIF preservation, and robust mounting.

Need to reuse existing SA/EF lenses without buying new L-Mount glass.
Concern over inconsistent or degraded autofocus with adapters.
Require EXIF metadata preservation for professional workflows.

Solution

The MC-21 solves migration friction by providing a single, manufacturer-backed adapter that retains essential lens functions and metadata while enabling legacy glass to operate on L-Mount cameras. Its LED compatibility indicator and firmware update path reduce guesswork and increase system longevity.

Benefits

Preserve Investment: Reuse SA and EF lenses, avoiding costly repurchases.
Reliable AF-S: Near-native AF-S performance with supported lenses.
Workflow Ready: EXIF data preserved for catalogue and post processes.
Mechanical Stability: Tripod socket protects camera mount with heavy lenses.

Applications

Professional photography migrating to L-Mount while keeping legacy lens collections.
Video production uses where AF-S and manual control suffice, and lens corrections aid image quality.
Rental houses and educators maintaining versatile inventories across mounts.

Why Choose

Official Sigma adapter with pre-loaded lens profiles, LED compatibility indicator, and firmware updates for growing lens support.

Specifications

Model / Variant	MC-21 (L-Mount)
Product Type	Mount Converter / Lens Adapter
Category / Sub-Category	Camera Accessory / Lens Mount Adapter
Release Year
Dimensions (W H D)
Weight	~145 g
Materials / Finish	Precision alloy housing, flocked interior
Power / Battery	N/A
Performance / Capacity	Maintains AF-S, aperture control, and EXIF transfer for supported lenses
Connectivity & I/O	Electronic contacts for lens communication, firmware update port via Sigma support tools
Storage / Media	N/A
Mount / Interface	Input: Sigma SA, Canon EF; Output: L-Mount
Environmental / Compliance	Not specified by manufacturer
Warranty	Manufacturer warranty (see Sigma policy)

Brand	SIGMA
Manufacturer SKU	89S969
UPC	85126937249

What’s included

1- Mount Converter MC-21, SIGMA SA-L to SA-Mount

Compatibility

FREEFLY Ember S5K	Sony BURANO	Sony ILX-LR1	Sony NEX-VG30	Sony PXW-FS7M2
Kinefinity MAVO LF MKII	Sony BURANO CineAlta Digital Cinema Camera	Sony NEX-EA50M	Sony NEX-VG900	Sony PXW-FX9
Kinefinity MAVO S35 MKII	Sony FX3	Sony NEX-EA50UH	Sony PXW-FS5	Sony VENICE 6K Digital Motion Picture Camera
Sony FX30	Sony NEX-FS700R	Sony PXW-FS5M2
Sony FX6	Sony NEX-FS700U	Sony PXW-FS7

FAQ

Does the SIGMA MC-21 support autofocus?

Yes, the MC-21 supports autofocus in AF-S (single-servo) mode for supported Sigma SA and Canon EF lenses; AF-C (continuous) is not supported for all lenses and can vary by lens model.

Which lenses are compatible with the MC-21?

The adapter supports Sigma SA-mount lenses and Canon EF-mount lenses. Compatibility may vary by specific lens model; Sigma pre-loads many lens profiles and provides firmware updates to add or improve compatibility.

Will EXIF data be preserved when using the MC-21?

Yes, the MC-21 preserves lens metadata such as lens model, focal length, and aperture in image EXIF, aiding cataloguing and post-production workflows.

Is a tripod mount included?

Yes, the MC-21 includes a tripod socket (1/4 inch-20 female thread) to support heavy lenses and reduce stress on the camera mount.

Can the MC-21 receive firmware updates?

Yes, Sigma provides firmware updates for the MC-21 via their support portal to add or improve lens profiles and compatibility.

Does the adapter affect image quality?

The adapter's flocked interior reduces internal reflections to protect contrast and color; optical performance is determined by the mounted lens, and the adapter transmits lens corrections to compatible L-Mount cameras.

Will Canon EF lenses retain aperture control?

Yes, supported Canon EF lenses retain electronic aperture control through the adapter when paired with compatible camera bodies.

Is the MC-21 weather sealed?

Sigma does not specify an IP rating for the MC-21; while it is robustly built, official weather sealing claims are not published.

What should I do if a lens shows incompatible via the LED indicator?

If the LED indicates incompatibility, check for available firmware updates for the adapter or lens. Refer to Sigma's support site for firmware instructions and compatibility lists.

Can I use third-party EF lenses like Tamron or Tokina?

Some third-party EF lenses may work with limited functionality. Compatibility varies by lens and may require manual focus or have restricted AF behavior; test specific lenses before critical use.