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Sigma has released new firmware for its 100-400mm F/5-6.3 DG OS HSM lens for Canon mount. According to Sigma, firmware version 1.01 improves the AF performance of the lens. When attached to the Sigma mount converter MC-11 AF performance will be improved as well. In addition the optical image stabilization mechanism can operate at faster speeds.
As usual, Sigma lens owners with the Sigma USB Dock must first update the Sigma Optimization Pro software to, at minimum, version 1.4.1 (Windows) or version 1.4.0 (Mac) before downloading and installing the new firmware.
Articles: Digital Photography Review (dpreview.com)