Free firmware update for super-telephoto lenses

Canon has released firmware update version 1.1.1 for the EF 300mm f2.8L IS II USM, EF 400mm f2.8L IS II USM, EF 500mm f4L IS II USM and EF 600mm f4L IS II USM lenses. This firmware update will be carried out free of charge from 6 August 2012 by Canon Service Centers.

Version 1.1.1 changes the control algorithm of the focus drive and enhances the drive’s responsiveness for more precise focus adjustments. In particular, the new firmware enhances the AI servo AF capability of the lenses to track objects that move irregularly in sports events, such as soccer or rugby.

The new firmware is for lenses which currently have firmware version 1.0.0. The serial numbers (10 digits) of the lenses equipped with firmware version 1.0.0 are as follows:

EF 300mm f/2.8L IS II USM / EF 400mm f/2.8L IS II USM The third digit in the serial number is either 0, 1, 2, or 3 (xx0xxxxxxx、xx1xxxxxxx、xx2xxxxxxx、xx3xxxxxxx).
EF 500mm f/4L IS II USM / EF 600mm f/4L IS II USM The third digit in the serial number is 0 (xx0xxxxxxx).

More EOS firmware updates

Canon released a number of firmware updates in March 2024, as follows: EOS R3 – version 1.7.1 1. Enables servo zooming to be remotely controlled from EOS Utility or Camera Connect when Power Zoom Adapter PZ-E2/PZ-E2B is attached to a compatible lens. 2. Enables up to 2 TB to be used on CFexpress cards larger than 2 TB. 3. Fixes an issue that may cause the camera, in rare instances, to stop functioning when using GPS. 4. Fixes an issue that may display Error Code 70 when performing anti-flicker shooting at a shutter speed of 1 second or higher. 5. Enhances security for FTPS (File Transfer Protocol Security) connections. 6. Fixes an issue in which Mobile File Transfer may not function when connecting the camera to an iPhone compatible with USB 3.0 and higher. 7. Fixes an issue that, under specific circumstances, may prevent the image from being displayed in the viewfinder or on the screen causing the camera to stop operating, or Error Code 70 may be displayed. 8. Fixes minor issues. EOS

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