Sigma just released firmware updates for the following lenses:
Firmware Modifications (applicable to all)
Note: Before upgrading the firmware of 30mm F1.4 DC HSM A013, please first update your SIGMA Optimization Pro to Ver1.2.0.
Download the Sigma Firmware Updates.
B&H carries the Sigma 24-105mm f/4 DG OS HSM, 18-200mm f/3.5-6.3 DC MACRO OS HSM and 30mm f/1.4 DC HSM lenses and the Sigma USB dock.