listing of ccd sensitivity ratios associated with various f numbers stored in advance in the eeprom 11 the data items of ccd sensitivity ratios are obtained by measuring the voltage level of an output of the ccd the voltage level of an output of the ccd is measured by varying the f number setting in a camera from f1 to fn n u2267 2 for each measurement the camera is used to image an object whose brightness is constant moreover when the f number can be varied continuously from f to f u2032 an intermediate value between s and s u2032 may be found by performing linear interpolation in other words the value of a function between s and s u2032 is found by fitting a curve close to s and s u2032 on the assumption that the three plotted points lie on a straight line with this capability the storage capacity of the eeprom 11 may be small in determining the exposure conditions at the time of photographing recording an exposure error resulting from a change in ccd sensitivity is corrected based on the ccd sensitivity ratios assume that a shutter speed designated to carry out ae imaging with a selected f number of fae and a shutter speed designated to carry out real exposure recording with a selected f number of frec have the following relationship in this manner recording can be achieved so that proper brightness so that recording will be unaffected by deterioration of ccd sensitivity resulting from narrowing the diaphragm as mentioned above according to the electronic.