The novel Cinefade system synchronises the external iris motor of a professional camera system with a light transmission filter to vary depth-of-field in film.
The same light transmission filter can also be used individually as a motorised variable ND filter that is remotely controlled by a cmotion lens control system to allow for precise and fast exposure changes when the camera is inaccessible or when the creative brief calls for an exact T-stop to maintain a consistent depth-of-field.