Download Lenses MOUNT CONVERTER MC-21 EF-L Firmware

Steps for
Firmware Update

The following procedure is to update the MOUNT CONVERTER firmware via SIGMA fp. Regarding firmware update via L-Mount cameras (Panasonic Lumix S1 / Lumix S1R / Lumix S1H、Leica SL2), please follow the instruction manual for each camera.

Before updating

  • Please ensure that the firmware of the camera body is updated to the latest version.
  • Use a fully charged battery or connect the camera to the AC adapter.
  • Do not disconnect the battery or the AC adapter during the firmware update of the MOUNT CONVERTER.
  • Ensure the power of the camera is always kept ON during the firmware update of the MOUNT CONVERTER.
  • The MOUNT CONVERTER needs to be attached to a camera to update the firmware.

How to check the firmware version of the MOUNT CONVERTER

Turn on the camera after attaching the MOUNT CONVERTER.
Press the MENU button on the back side of the camera body and open the setup menu.

Select “Firmware Update” from the setup menu.

After the OK button is pressed, “Camera” and “Lens” shows up. Please select “Lens”.

The firmware version that is installed in the MOUNT CONVERTER will show up.
If the firmware version is “Ver.1.2” or older, it is necessary to download the new version and update.


Check the terms and conditions on the SIGMA Software Program License Agreement, and download the file if you agree with them. Select the directory and save the file.


NOTICE: Read this before downloading, copying or using the Software Program.
Refrain from downloading the software unless you agree with the terms and conditions. These terms and conditions will be regarded as accepted when users select to download it.

Installing and using the Licensed Software Program for Firmware ("Licensed Software") indicates the acceptance of these terms and conditions when users select “download” button. Read all of the terms and conditions of this license agreement prior to installing or using the Licensed Software Program. If you do not accept these terms, you must delete the Licensed Software Program from your hardware.
Please note that you may not use, copy, modify or transfer the Licensed Software or documentation or any copy, except as expressly provided in this agreement.


This Licensed Software Program (the "Software") and the accompanying on-line read-me and help files (the "Documentation") are licensed, not sold, to you by SIGMA Corporation ("SIGMA"). Subject to the terms of this Agreement, you have a personal, nontransferable, nonexclusive and non-sublicensable right to use the Software solely for your personal or internal business purposes, and not for any further resale, re-license or other use by third parties. On condition that you own an applicable MOUNT CONVERTER for update, you may use this Software on any computer or recording media owned by you or under your control. You agree to prevent and protect the contents of the Software and Documentation from unauthorized disclosure or use. SIGMA reserves all rights not expressly granted to you. SIGMA's licensors are the intended third party beneficiaries of this license agreement and have the express right to rely upon and directly enforce the terms set forth herein.

Limitation on Use.

You agree not to
i. assign, transfer, lease, rent or engage in any time-sharing of the Software,
ii. alter or modify the Software, in whole or in part,
iii. modify or create any derivative work of the Software, in whole or in part or,
iv. reverse assemble, decompile, reverse engineer or otherwise attempt to derive source code, the underlying ideas, algorithms, structure or organization of the Software in whole or in part.
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You may not sublicense, assign, delegate, rent, lease, time-share or otherwise transfer this license or any of the related rights or obligations for any reason. Any attempt to make any such sublicense, assignment, delegation or other transfer by you shall be void.


The Software and related Documentation are copyrighted by SIGMA. You may only copy the Software (or this license) to update applicable MOUNT CONVERTER by computers or cameras which are owned by you or under your control. You may make one copy of the Documentation and print one copy of any on-line documentation or other materials provided to you in electronic form for each permitted copy of the Program. Any and all other copies of the Software and any copy of the Documentation made by you are in violation of this license.


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DOWNLOAD MCLE0130.plf (991KB)

* After you agree to term, if the download does not complete even after clicking the download button, right-click and select “Save Target As ...”, to download.


Prepare SD/SDHC/SDXC card and format in camera. Note: Please make sure that important data is not inside your SD/SDHC/SDXC card before format.


For Windows
(It appears differently depending on OS version.)

For Macintosh
(It appears differently depending on OS version.)

Connect the SD/SDHC/SDXC card to the computer via card reader etc. and copy the downloaded file to the root directory (the top layer of the file structure) of the SD/SDHC/SDXC card. (The copy destination is not in the “DCIM” subfolder)


Insert the SD/SDHC/SDXC card with the firmware to the camera and turn on the power.


Press the MENU button on the back side of the camera body and open the setup menu.


Select “Update Firmware” and select “OK”.


After selecting the OK button, “Camera” and “Lens” appears on the display. Please select “Lens”.


The message “Start firmware update?” will appear on the display.

In case the message does not appear

In case the message “Start firmware update?” does not appear on the display, please check the following notes.

The firmware update file is not installed in the card, or not in the appropriate directory.

The update file may not be in the card or the firmware may not be in the specified directory. Please repeat STEP 02.

The correct firmware is not installed.

If the card contains a firmware version older than the MOUNT CONVERTER, it cannot be updated. Put the correct version of firmware into the card and start over from STEP 03.

There is not enough battery.

Use a fully charged battery or an AC adapter and start over from STEP 03.


Select “Yes” to start the firmware update. Shortly the update will start.


If the message “Firmware update has failed” is displayed during the firmware update, please contact our customer support.


「When "Firmware update is complete. It will restart automatically" is displayed, the update is complete. * Do not operate the camera until the update completion message appears.


Check the “Information” version in the setup menu and confirm the lens version is updated to Ver. 1.3.

Inquiries on the firmware update

For further inquiries on the firmware update, please contact your nearest authorized SIGMA subsidiary / distributor.
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