Medical control device and medical observation system

A medical observation system comprising:

• a light source configured to emit first light and second light having a wavelength band different from a wavelength band of the first light;
• an imaging device including a first imaging element and a second imaging element, the imaging device being configured to
• irradiate an observation target with the first light to capture return light of the first light via the observation target to generate a first captured image, and
• irradiate the observation target with the second light to capture return light of the second light via the observation target to generate a second captured image;
• and
• circuitry configured to control operations of the light source device and the imaging device, the circuitry further configured to
• control an operation of the light source device and adjust a light amount of the first light and a light amount of the second light, and
• control an operation of the imaging device, and execute
• first processing of changing an exposure period of the imaging element, and
• second processing of discarding image information generated by the imaging element according to light reception in a partial period of the exposure period, wherein
• the circuitry is further configured to control an increase, after the light amount of the first light and the light amount of the second light decrease to a drive limit value, a diaphragm amount of an electronic shutter of the first imaging element and a diaphragm amount of an electronic shutter of the second imaging element while maintaining a state in which a ratio between an effective exposure period of the first imaging element and an effective exposure period of the second imaging element is a specific ratio.