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[From Canon Website]
Canon has released a new firmware update (Firmware Version 1.1.1) for the EF 300mm f/2.8L IS II USM, EF 400mm F2.8L IS II USM, EF 500mm f/4L IS II USM and EF 600mm f/4L IS II USM lenses. This firmware update will be performed by Canon Service Centers.
Firmware Version 1.1.1 incorporates the following enhancement:
Changes the control algorithm of the focus drive, and enhances the drives 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. Please contact customer support if you are unsure as to what firmware your lens currently supports.
The serial numbers (10 digits) of the lenses equipped with Firmware Version 1.0.0 are as below.
EF 300mm 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 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：
The third digit in the serial number is 0 (xx0xxxxxxx).
EF 600mm f/4L IS II USM：
The third digit in the serial number is 0 (xx0xxxxxxx).
Answer :
The products affected by this issue will be updated on your behalf free of charge from 06 August 2012 and you are kindly requested to contact one of our authorised service facilities.
If you have any further enquiries, please contact us using the e-mail support or telephone support option.
We offer our sincere apologies to customers who have been inconvenienced by this. Canon strives to provide the highest quality products to our customers, and we spare no effort in our quality management to make sure our customers use our products with confidence. We hope our efforts will earn your understanding.
_______________________________________
Anyone else affected by this?
Canon has released a new firmware update (Firmware Version 1.1.1) for the EF 300mm f/2.8L IS II USM, EF 400mm F2.8L IS II USM, EF 500mm f/4L IS II USM and EF 600mm f/4L IS II USM lenses. This firmware update will be performed by Canon Service Centers.
Firmware Version 1.1.1 incorporates the following enhancement:
Changes the control algorithm of the focus drive, and enhances the drives 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. Please contact customer support if you are unsure as to what firmware your lens currently supports.
The serial numbers (10 digits) of the lenses equipped with Firmware Version 1.0.0 are as below.
EF 300mm 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 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：
The third digit in the serial number is 0 (xx0xxxxxxx).
EF 600mm f/4L IS II USM：
The third digit in the serial number is 0 (xx0xxxxxxx).
Answer :
The products affected by this issue will be updated on your behalf free of charge from 06 August 2012 and you are kindly requested to contact one of our authorised service facilities.
If you have any further enquiries, please contact us using the e-mail support or telephone support option.
We offer our sincere apologies to customers who have been inconvenienced by this. Canon strives to provide the highest quality products to our customers, and we spare no effort in our quality management to make sure our customers use our products with confidence. We hope our efforts will earn your understanding.
_______________________________________
Anyone else affected by this?