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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).

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