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http://www.sigma-photo.co.jp/english...pic.php?id=673

"We would like to announce the availability of a new firmware update for the following Canon mount lenses.The lens firmware updates improve the AF accuracy when it is mounted on the SIGMA MOUNT CONVERTER MC-11 EF-E, and offers the improved usability for video shooting."

Applicable products:
・SIGMA 24-105mm F4 DG OS HSM | Art CANON
・SIGMA 17-70mm F2.8-4 DC MACRO OS HSM | Contemporary CANON
・SIGMA 18-200mm F3.5-6.3 DC MACRO OS HSM | Contemporary CANON
・SIGMA 18-300mm F3.5-6.3 DC MACRO OS HSM | Contemporary CANON

Benefits of this firmware update:
・It has improved the AF accuracy when the lens is attached with the SIGMA MOUNT CONVERTER MC-11.
・It has reduced the operating sound of the lens diaphragm blades when attached with the SIGMA MOUNT CONVERTER MC-11 EF-E and used for video shooting.
・It has improved the AF accuracy when the lens is used for video shooting as well as with Live View mode of EOS DIGITAL SLR cameras.*1
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