Canon has released firmware updates for its EOS 5D Mark III and EOS-1D X DSLRs. Both updates claim to improve the user's ability to control autofocus in Live View mode when wide angle lenses are used. Firmware 2.0.7 for the 1D-X also fixes a couple of issues, including a problem with vertical lines appearing when long exposures are used. Read more EOS-1D X Mark III Firmware Update, Version 1.7.1 [Windows] For Windows 11, 24th March 2023 EOS-1D X Mark III Firmware Update, Version 1.8.0 [Windows]
The Canon EOS R3, Canon EOS R5, Canon EOS R6 II, Canon EOS R8, and the Canon EOS-1D X Mark III have all received new firmware updates, featuring minor new features as well as bug fixes.

In the folder you downloaded are the firmware (1DX30180.FIR / file size: 65,886,352 bytes) and instructions on the firmware update procedures (a PDF file in five languages: Japanese, English, French, Spanish, and Simplified Chinese).

Canon has released the new firmware version 1.3.0 for Canon EOS-1D X Mark III DSLR camera. Firmware Version 1.3.0 incorporates the following enhancements: Enables 2nd curtain shooting sync during radio transmission wireless flash shooting when the Speedlite EL-1 flash is attached to the camera. Enables manual flash output (excluding high-speed

Affected Products. EOS-1D X Mark III. Support. Changes in firmware: The firmware ( version 1.8.0) incorporates the following fixes and enhancements: Adds the ability to register the focus position in the preset functions of the CR-A100 Camera Remote Application. When used with the Robotic Camera System CR-S700R, it helps the user to focus on
Shot-to-shot cycle times in the Canon 1D Mark IV's single-shot mode were extremely fast at 0.29 second for Large/Fine JPEGs, 0.27 second for RAWs and 0.30 second for RAW + L/F JPEGs. Continuous
A supported camera* is required for the firmware update. Cameras that can be used for the firmware update: Canon EOS-1D X (*1), Canon EOS 5D Mark III (*1,*2), or Canon EOS REBEL T4i *1. If the "Battery Info." on the menu screen is checked right before performing the firmware update, the update operation may fail.
A few months ago Canon were very keen for me to toe the marketing line and retract what one of their own guys said at Photokina about the 1D C being basically a 1D X with a firmware update. So they set me up an interview with one of their product managers who didn’t really answer my questions but did say that the 1D C was different hardware yfMK.
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    • canon 1d mark iv firmware update