ZK3.5x85 is a telephoto zoom lens with a frequently-used focal length covering from 85 to 300mm.

Thanks to the detachable servo drive unit on the ZK series, the lens can be operated in the same manner as a traditional broadcast ENG-Style lens and accessories. Furthermore, with the servo drive unit removed, traditional cinema manual, or external cine motors for zooming and focusing operation is also available for all models of this series.