Sigma Autofocus Issues
June 16 (news)--Sigma has announced that three recent telephoto zoom lenses may have problems correctly autofocusing in some cases. Contact your local Sigma service center to obtain information on how to have your lens inspected and corrected (in the US, you'll have to call, as the support bulletin is not yet on the US Web site that I can see). The three lenses are:
50-500mm f/4.5-6.3 DG OS HSM with serial numbers between 10633051 and 1097200.
120-400mm f/4.5-5.6 DG OS HSM with serial numbers between 10574001 and 1097200.
150-500mm f/5-6.3 DG OS HSM with serial numbers between 10674301 and 1097200.