This was posted on 'Canon Rumors' of 19 September.
Has anyone had their lens updated yet? If so with what results?
"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 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."
Has anyone had their lens updated yet? If so with what results?
"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 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."