Canon EF 400mm f/2.8L IS III USM

Canon EF 400mm f/2.8L IS III USM firmware

Canon · EF 400mm f/2.8L IS III USM · EF 400mm f/2.8L IS III USM · Lens

Latest firmware for the Canon EF 400mm f/2.8L IS III USM is v1.1.3 (July 7, 2020).

Specifications

EF 400mm f/2.8L IS III USM specifications

Focal length
400mm
Maximum aperture
F2.8
Minimum aperture
F32
Type
Prime Lens
Filter thread
52 mm
Elements / groups
17/13
Aperture blades
9
Closest focus
2.5 m
Maximum magnification
0.17×
Stabilisation
Yes
Autofocus
Yes
Mount
Canon EF
Weight
2840 g
Dimensions
343 × 163 mm

Changelog

EF 400mm f/2.8L IS III USM firmware changelog

  1. v1.1.3 first tracked

Firmware history

  1. Version 1.1.3 Latest Released Jul 7, 2020 First seen Jul 10, 2026
    Show release notes

    Firmware Version 1.1.3 incorporates the following enhancements:

    • Focusing performance has be​en improved when using the Servo AF continuous shooting mode. Firmware Version 1.1.3 is for lenses with firmware up to Version 1.1.2 If the lens' firmware is already Version 1.1.3, it is not necessary to update the firmware. You can check the firmware version of the lens from the camera menu. Refer to the camera instruction manual for how to check the version. Please review the instructions thoroughly before you download the fir​mware. Preparations for the firmware update: In the folder you downloaded are the firmware ( EF019113.lfu / file size: 2,883,636 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 check the procedure in accordance with the instruction.
    Release notes & download

Watch the EF 400mm f/2.8L IS III USM for updates

Get an email the moment Canon publishes new firmware. Just your email — no account or password needed.

More Canon lenses we track