Canon Product Advisory for EF 300mm f/2.8L IS II, EF 400mm f/2.8L IS II, EF 500mm f/4L IS II, and EF 600mm f/4L IS II Lenses (firmware update)

EF 300mm f/2.8L IS II

Canon advisory:

To the Users of the EF 300mm f/2.8L IS II USM, EF 400mm f/2.8L IS II USM, EF 500mm f/4L IS II USM, and EF 600mm f/4L IS II USM Interchangeable Lenses for Canon Digital SLR Cameras

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.

Canon has released a firmware update for EF300mm f/2.8L IS II USM, EF400mm F2.8L IS II USM, EF500mm f/4L IS II USM and EF600mm f/4L IS II USM lenses. This firmware update will be performed by Canon Service Centers. Please contact us using the contact information listed at the bottom of this page.

Firmware changes:
Firmware Version 1.1.1 incorporates the following enhancement:

1. Changes the control algorithm of the focus drive, and enhances the drive’s responsiveness for more precise focus and 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 presents 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.

Support
This information is for residents of the United States and Puerto Rico only. If you do not reside in the USA or Puerto Rico, please contact the Canon Customer Support Center in your region.

Please register your EF300mm f/2.8L IS II USM, EF400mm f/2.8L IS II USM, EF500mm f/4L IS II USM or EF600mm f/4L IS II USM.  By registering, we will be able to notify you via email when future firmware updates become available.

Thank you,
Customer Support Operations
Canon U.S.A., Inc

Contact Information for Inquiries
Canon Customer Support Center
Phone:	1-800-OK-CANON
	1-800-652-2666
TDD:	1-866-251-3752
Email:	[email protected]
For additional support options: www.usa.canon.com/support