PURPOSE: To display a negative image which is brought to an image pickup, on a monitor screen together with a marked line for showing a trimming area, by replacing a small and light TV camera which uses a CCD sensor array, with a projection lens, so that it can move on an optical axis.

CONSTITUTION: A projection lens 9 and a TV camera 10 are placed at an equal distance from the rotation center of a seat plate 11, and replaced and installed alternately on an optical axis, when a replacing device 12 is operated. At the time of an image exposure, a trimming mask frame 27 of a size which conforms with a size of a duplicate image is installed in an exposing part. On a screen of a monitor 14, an image of an original picture which is brought to an image pickup by the TV camera 10, and a marked line corresponding to the trimming mask frame which is installed in the exposing part are superposed and displayed, and by making an image size which is brought to an image pickup and displayed by the TV camera 10 correspond to an image size which is projected and made to form an image to the exposing part, a trimming state of the duplicate image can be displayed exactly.