slrclub (via dicahub) reports that Sigma will launch a universal lens conversion service. All Sigma lenses with 10 contacts can be easily modified to get another mount type, except for Nikon/Pentax version of Sigma lenses. For Nikon/Pentax versions, the aperture will be controlled mechanically after the conversion. There shouldn’t be such issues with Canon/Sony/Other versions of Sigma lenses. Tomorrow we will know more, since Sigma will officially announce the service on August 1st. The service will start from 9/2.