of 20 it is determined whether the preview button 3 is switched on or not the preview button 3 is intended for performing actual stopping down operation up to a value which user sets up so that the user can confirm depth of field in the photographic frame before taking a picture if the preview button 3 is switched on data for displaying a depth of field is prepared 21 and it is displayed 80 then the mode of the display of the lcd device 11 is switched from the main display mode to the depth of field display mode or displaying mode of the depth of field both described thereafter this switchover is shown in fig9 the screen 100 is a u201c detailed screen u201d refer to fig1 which is one of the main display modes in this display mode when the preview button 3 is pushed the screen is switched to a screen 120 which presents the depth of field display mode in the screen 120 a reference numeral 121 represents an icon which indicates camera position and a reference numeral 122 represents an icon which indicates object position a triangular pointer 123 is an icon which indicates a position where a focus is in the optimum the screen 120 shows that the camera can substantially focus on the photographic object in the range from 2.