Firmware: Canon EF 200-400mm f/4L IS 1.4x v1.1.0

Last updated: May 6, 2025 1:28 am

Craig

Published: May 8, 2018

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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.

Download firmware v1.1.0 for the Canon EF 200-400mm f/4L IS 1.4x

TAGGED:EF 200-400 f/4L IS 1.4x firmware

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Craig is the founder and editorial director for Canon Rumors. He has been writing about all things Canon for more than 17 years. When he's not writing, you can find him shooting professional basketball and travelling the world looking for the next wildlife adventure. The Canon EOS R1 is his camera of choice.