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Canon has released new firmware for the EF 200-400mm f/4L IS 1.4x.
Changes in firmware
Firmware Version 1.1.0 is incorporated with the following correction.
- Corrects a phenomenon in which the subject may not be in focus on some occasions when using this lens with some camera models (*) and performing AF shooting from approximately 3m.
* Some camera models:
EOS-1D X, Mark II, EOS-1D X, EOS-1D C, EOS 5Ds, EOS 5Ds R, EOS 5D Mark IV, EOS 5D Mark III
Firmware Version 1.1.0 is for lenses with Firmware Version 1.0.0. If the lens’ firmware is already Version 1.1.0, it is not necessary to update the firmware.