Sigma has announced the availability of the new Sigma 70-200mm F2.8 EX DG OS HSM Lens.
Sigma has announced the Sigma APO 50-500mm f/4.5-6.3 DG OS HSM Lens APS-C Hood Adapter. This adapter will be provided with new lenses and will be provided at no charge to current owners of this lens.
Sigma has issued a Service Notice regarding the following lenses and serial number ranges:
APO 50-500mm F4.5-6.3 DG OS HSM (10633051 - 10972000)
APO 120-400mm F4.5-5.6 DG OS HSM (10574001 - 10972000)
APO 150-500mm F5-6.3 DG OS HSM (10674301 - 10972000)
Details of the issue being resolved are vague: "possible autofocus defect".