Here is a summary or excerpt from an article that has just been published on DPNow:
The new LUMIX G lens incorporates an inner focus direct-drive linear motor for focusing, which enables smooth, silent operation of its fast and accurate contrast AF system, for use in both photo and movie recording.
More...
The new LUMIX G lens incorporates an inner focus direct-drive linear motor for focusing, which enables smooth, silent operation of its fast and accurate contrast AF system, for use in both photo and movie recording.
More...