Scan line to scan line feedforward in an autofocus system of an imaging system

The present invention is in the field of imaging systems. More particularly, the present invention provides an autofocus system for an imaging system that incorporates a feedforward signal to increase the effective tracking bandwidth of the autofocus system. The present invention provides an autofocus system for an imaging system, such as an external drum platesetter. The autofocus system automatically focuses each of a plurality of scan lines produced by an imaging system on a supply of recording material, and includes a control loop with scan line to scan line feedforward of a motor command waveform.