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Made by Canon
The Canon EF 200-400mm f/4L IS USM Extender 1.4x is a professional super-telephoto zoom lens with a built-in 1.4x extender that instantly switches the focal range to 280-560mm. It is designed for professional sports, wildlife, and news photographers requiring versatile reach without changing lenses, featuring 4-stop IS and fluorite elements for exceptional optical quality. Firmware updates address compatibility and autofocus improvements with newer Canon bodies.
Product released: June 1, 2013
Version 1.1.0, released April 24, 2018
Verified by LatestUpdate: June 18, 2026
Changes in firmware 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. Preparations for the firmware update: In the folder you downloaded are the firmware (for EF200-400mm f/4L IS USM Extender 1.4x: EF015110.lfu / file size: 360,500 bytes) and instructions on the firmware update procedures (a PDF file in five languages: Japanese, English, French, Spanish, and Simplified Chinese). Before starting the firmware update operations, please be sure to carefully confirm your understanding of these instructions.
Official Canon EF 200-400mm f/4L IS USM Extender 1.4x product page
The Canon EF 200-400mm f/4L IS USM Extender 1.4x is a professional super-telephoto zoom lens with a built-in 1.4x extender that instantly switches the focal range to 280-560mm. It is designed for professional sports, wildlife, and news photographers requiring versatile reach without changing lenses, featuring 4-stop IS and fluorite elements for exceptional optical quality. Firmware updates address compatibility and autofocus improvements with newer Canon bodies. It was originally released on June 1, 2013.
The latest firmware version for the Canon EF 200-400mm f/4L IS USM Extender 1.4x is 1.1.0. It was released on April 24, 2018.
Canon EF 200-400mm f/4L IS USM Extender 1.4x firmware version 1.1.0 includes the following changes: Changes in firmware 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....
To update the Canon EF 200-400mm f/4L IS USM Extender 1.4x firmware, download the latest version (1.1.0) from Canon's website. Follow Canon's installation instructions, which typically involve copying the firmware file to a memory card or connecting via USB. You can download the latest firmware from Canon's support page.
Details and download instructions for the latest Canon EF 200-400mm f/4L IS USM Extender 1.4x firmware (version 1.1.0) are on Canon's official release page: https://www.canon.co.uk/support/consumer/products/lenses/ef/ef-200-400mm-f4l-is-usm-extender-14x.html?type=firmware
You can track Canon EF 200-400mm f/4L IS USM Extender 1.4x firmware updates automatically on LatestUpdate.io. We monitor Canon's releases and notify you when new firmware versions are available, so you never miss an update.
The Canon EF 200-400mm f/4L IS USM Extender 1.4x is manufactured by Canon. Visit the official product page for more information.