The aim of the invention is reduce the damage to material containing cellulose during the bleaching thereof, by using bleaching catalysts, without significantly affecting the bleaching performance. A camera having this zoom lens unit incorporated therein includes a control unit into which control information, with respect to any of a plurality of variable design parameters for the zoom lens unit, is inputted by the user. The apparatus includes a combined dissector-retractor having a balloon retractor disposed upon the surface of the balloon dissector and integrated therewith.