electronically controlled film transport methods and systems are described . one system described comprises a film transport path for transporting film , an input drive assembly for advancing film through the film transport path , an output drive assembly for advancing film out of the film transport path , an aperture positioned in the film transport path , at least one registration pin capable of engaging at least one perforation in the film to secure a portion of the film in the aperture , wherein the at least one registration pin is capable of retracting to a non - engaging position , and a controller for controlling the retraction of the at least one registration pin .