Canon EF 200-400mm F/4L IS 1.4X Firmware Update V1.1.0 Released

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Canon released the new firmware update version 1.1.0 for Canon EF 200-400mm f/4L IS USM Extender 1.4x Lens. You can follow the links below to download the firmware update:

Download links:

Canon EF 200-400mm f/4L IS USM Extender 1.4x Lens Firmware Version 1.1.0

Firmware Version 1.1.0 is incorporated with the following correction.

  1. 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.

Canon EF 200-400mm F/4L IS 1.4X: $10,999 at Amazon, B&H, Adorama