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New Firmware for Canon EOS-1D X Mark III and EF 100-400mm f/4.5-5.6L IS II USM Lens

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Canon released new firmware updates for EOS-1D X Mark III camera and EF 100-400mm f/4.5-5.6L IS II USM lens. This is a bug fix firmware for the EOS-1D X Mark III while the EF 100-400mm fixes a phenomenon.

The compact, high-performance L-series supertele zoom lens that is ideally suited for sports and wildlife photography which has a price tag for $2,199.

Here are the firmware update details and download links.

Firmware Version 1.2.1 incorporates the following fix:

1. Fixes a phenomenon, in which, after updating the camera’s firmware to version 1.2.0, the Smart Controller may respond slowly or not at all on some cameras*.

*The phenomenon described above may occur in cameras whose first two digits of the serial number are “01” “02” “03” or “04”.

Firmware Version 1.2.1 also incorporates the following fixes and enhancements from Firmware Version 1.2.0:

1. Enhancements when using Browser Remote:
– The image list displayed will be refreshed automatically on the browser.
– On the shooting screen of the browser, you can set the movie resolution and a high frame rate.
– On the shooting screen of the browser, you can change the movie shooting mode.
– On the shooting screen of the browser, Live View will be displayed as soon as you select the movie shooting button.
2. Enhances Auto Focus (AF) for improved face and eye recognition at greater distances.
3. Fixes a phenomenon that may occur during viewfinder shooting, in which the shutter may not be released or the camera may not operate in the following settings:
– In One-Shot AF mode, when the AF Area Selection Mode is set as Zone AF, Large Zone AF or Automatic Selection AF.
– In AI Servo AF, when direct AF point selection is made using the smart controller.
– When the Register/Recall Shooting Function is assigned to the AE Lock button, in the Custom Controls.
4. Connectivity during FTP transmission, has been improved.
5. Improves Wi-Fi connectivity when using the Wireless File Transmitter WFT-E9.
6. Fixes a phenomenon, in which the card access time may take longer, when using certain CFexpress cards.

Firmware Version 1.2.1 is for cameras with firmware up to Version 1.2.0. If the camera’s firmware is already Version 1.2.1, it is not necessary to update the firmware.

In accordance to the functional improvements of Firmware Version 1.2.0, the user’s manual will be revised. Please download the user’s manual together with the new firmware.

Download Firmware Version 1.2.1

Canon EOS-1D X Mark III with CFexpress Card and Reader Bundle: $6,499 at (AmazonB&HAdorama)

Read more: Best Lenses for Canon EOS-1D X Mark III

Firmware Version 1.0.7 incorporates the following fix.

  • Fixes a phenomenon, in rare cases, the IS mechanism may cause the image to jump.

Download firmware v1.0.7 at Canon USA