Abstract: An endoscope of the type having in its imaging system a solid state imaging device provided in its insertable section into a cavity of a living body for receiving an optical image and converting it into electrical signals which are processed and then transmitted to a monitor to be visualized thereon. The endoscope comprises an operating part having an insertable section into a cavity which includes therein a solid state imaging device for receiving an optical image and converting it into electrical signals, a control unit for providing driving signals for the solid state imaging device and processing the signals from the solid state imaging device to provide a video signal and a display for receiving the video signal from the control unit to be visualized as, for example, a television picture. The operating part further includes an adjusting means for modifying levels of the driving signals corresponding to the characteristics of the solid state imaging device.