Canon RF 400mm F2.8L IS USM firmware v1.0.6

Firmware Version 1.0.6 incorporates the following enhancement: 1.​ Improves the Panning Assist control feature for 2nd and subsequent images captured during continuous shooting when using the electronic shutter.

If the lens' firmware is already Version 1.0.6, it is not necessary to update the firmware.

You can check the firmware version of the lens from the camera menu.

Refer to the camera instruction manual for how to check the current firmware version.

Preparations for a firmware update: After the downloaded compressed file (.zip) is extracted, a firmware folder is created.

• Extracting the downloaded file: Right-click the zip file, and then select Extract All to extract the file. In the folder you downloaded are the firmware (RF037106.afu / file size: 2,883,636 bytes) and instructions on the firmware update procedures (a PDF file in five languages: Japanese, English, French, Spanish, and Simplifi​ed Chinese). Before starting the firmware update operations, please be sure to carefully review the instructions to confirm your understanding of the firmware update procedures. (The following is the history of past firmware updates) Firmware Version 1.0.6 is the first update to be released.