Canon EF 200-400mm f/4L IS USM Extender 1.4x
firmware v1.1.0
Canon · Released Apr 24, 2018 · First seen Jul 10, 2026
v1.1.0 is the latest firmware for the Canon EF 200-400mm f/4L IS USM Extender 1.4x, released April 24, 2018.
What's in this update
Release notes not published by vendor — see official page. Check Canon's website for the full details of what this update changes.
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