Thank you for purchasing and using our products.

We would like to announce that a new firmware update for SIGMA 100-400mm F5-6.3 DG DN OS | Contemporary for L-Mount is now available.

[Applicable product]

SIGMA 100-400mm F5-6.3 DG DN OS | Contemporary for L-Mount

[Benefits of the update]

It has improved the phenomenon whereby the lens' optical stabilizer effect differs depending on the shutter type used.

[How to update]

For those who update the firmware in-camera, please refer to the following page:

For customers who own the SIGMA USB DOCK UD-11:
Connect the lens to a computer via the SIGMA USB DOCK UD-11 (sold separately), then open SIGMA Optimization Pro*. If the lens firmware is not the latest version, the following message will appear: "The latest lens firmware is available". Click "Yes" to update.

*Before updating lens firmware using the SIGMA USB DOCK UD-11, please ensure you update SIGMA Optimization Pro to the latest version.

[SIGMA Optimization Pro download page]

For further information, please contact your nearest authorized SIGMA subsidiary / distributor.

For Canadian customers, please contact Gentec International at:

For worldwide support, please contact your local authorized SIGMA Service Station at:

We appreciate your continued support for our company and products.