PURPOSE: To set image formation magnification freely in the vertical and horizontal directions and to take sharp enlarged and reduced copies by providing a variable power cylindrical lens for varying the image formation magnification of an original in one direction, and using it in combination with an image formation optical system.

CONSTITUTION: The (x)-directional image formation magnification of the original 4 is inputted to an input device 26 and the actuator 22 for the variable power cylindrical lens 16 is operated by a control means 18 to vary the (x)-directional image formation magnification. The control means 18 controls moving speeds of actuators 20 and 24 to equalize the ratio of the (m)-directional (x-directional) movement extent of the original 4 and the M-directional rotation extent of a photoreceptor 12 to the image formation magnification. An image reduced or enlarged only in one direction of the original 4 is formed on the photoreceptor 12 with light from an illumination optical system 6. When the variable power optical system uses an image formation lens system 10, the two-dimensional size of a copy image is varied freely.