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Sigma has released Firmware v 1.02 for the 18-35mm f/1.8 DC HSM
Autofocus is supported at any aperture value when used with the Canon Digital Cinema Camera EOS C100.
Please Note: Before upgrading the firmware of 18-35mm F1.8 DC HSM A013, please first update your SIGMA Optimization Pro to Ver1.2.0.
Sigma 18-35mm f/1.8 DC HSM Art Firmware v1.02 | Sigma 18-35 f/1.8 DC HSM Art at B&H Photo