To the Users of the EF300mm f/2.8L IS II USM, EF400mm f/2.8L IS II USM, EF500mm f/4L IS II USM, and EF600mm f/4L IS II USM Interchangeable Lenses for Canon SLR Cameras

We are releasing new firmware (Version 1.1.1) to incorporate new functions into the EF300mm f/2.8L IS II USM and EF400mm F2.8L IS II USM that were released in August 2011, and EF500mm f/4L IS II USM and EF600mm f/4L IS II USM that were released in May 2012.

UPDATE:

Please see the changes to the “Identification Procedure” section below regarding the criteria for affected serial numbers. The identification procedure has been enhanced to include the first, second and third digits from the left in order to more precisely identify affected products.

Thank you for using Canon products.
In August 2012, Canon released a firmware update for EF300mm f/2.8L IS II USM, EF400mm f/2.8L IS II USM, EF500mm f/4L IS II USM and EF600mm f/4L IS II USM lenses. The details are described below.

Firmware changes

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.

Affected Products

Firmware Version 1.1.1 is for lenses with Firmware Version 1.0.0. If the lens’ firmware is already Version 1.1.1, it is not necessary to update the firmware.

Identification Procedure:
The first, second, and third digits from the left in the serial number (10 digits) for lenses equipped with Firmware Version 1.0.0 are as follows:

 Lens Name
Serial numbers of affected products
(x represents any optional numbers) 
 EF300mm f/2.8L IS II USM 790xxxxxxx through 913xxxxxxx 
EF400mm f/2.8L IS II USM 
790xxxxxxx through 913xxxxxxx 
EF500mm f/4L IS II USM
 880xxxxxxx through 910xxxxxxx
EF600mm f/4L IS II USM
 880xxxxxxx through 910xxxxxxx
Lenses with serial numbers other than those listed above are equipped with Firmware Version 1.1.1 or later.

Market Support

For customers who wish to have the firmware of their lenses updated, please bring your lenses to your nearest Canon service center and this service will be provided to you free of charge.

Contact Information for Inquiries

Canon Australia
Services and Support 13 13 83 (local call)
Canon New Zealand
Customer Care
0800 222 666