The present invention further relates to a projection system for film which comprises a film gate having a projection aperture, such that film frames of the film move past the projection aperture; and a drive mechanism for moving the film progressively past the projection aperture. The drive mechanism comprises a first rotary member having a drive pin and a second rotary member operationally associated with film. The second rotary member comprises a plurality of slots which cooperate with the drive pin of the first rotary member to cause an intermittent rotation of the second rotary member and thereby cause an intermittent motion of the film. One of the drive pin or the slots being shaped in a controlled manner to permit the second rotary member to reach a peak acceleration and a peak deceleration in a continuous manner.