based on a pg signal from the pg coil 50 the servo circuit 54 with a reference signal constituting a reference for the rotation of the magnetic disk 48 and the servo circuit 54 controls the rotation of the motor 52 based on said reference signal and an fg signal from the motor 52 then in response to the closing of the shutter switch 81 the diaphragm 12 is so controlled as to obtain an appropriate exposure and the image pickup circuit 14 accumulates charges corresponding to the light coming from an object for a predetermined period said charges are read by clock signals from the standard signal generator 78 fig2 shows the circuit structure of the image pickup circuit 14 and the filter arrangement of the photoelectric conversion device these structures will not be explained in detail since they are already known the output of the image pickup circuit 14 is supplied through the switch 16 to the a d converter 18 digitized therein and stored in succession in the frame memory 22 when the rotation of the magnetic disk 48 becomes stabilized at a predetermined value the servo circuit 54 sends a servo locking signal to the system control circuit 76 which in response activates the high speed arithmetic operation circuit 26 thereby releasing the stored data of the frame memory 22 with conversion to the recording format for the magnetic disk 48 more specifically the pixel data stored in the frame memory 22 in the order of color filter arrangements of the photoelectric conversion device of.