Abstract: A zoom lens barrel driving system for a camera includes a driving source, a magnification controlling unit, and a focus controlling unit. The magnification controlling unit is formed with a plurality of barrels and a plurality of lens groups. The barrels and the lens groups move in an optical axis direction upon receipt of a driving power from the driving source such that magnification continuously varies. The focus controlling unit is formed by the lens groups. The lens groups repeatedly move between a near focal position and an infinite focal position in the optical axis direction in synchronization with variation in the magnification to perform a focus controlling operation.

Abstract: A photographic printer includes a light source for radiating light rays for photographic printing to a film; a unit for fixing the film; a unit for providing a film information signal by detecting the light filtered through the film; an image processing unit for processing the film information signal and generating a corresponding control signal; an image display unit located between the light source and the film for displaying an image corresponding to the control signal; and a focusing unit for forming an image on a printing paper according to the light filtered through the image display means and the film.