Patent ID: 8723937

Claim:
An endoscope system comprising: an imaging section comprising: an imaging optical system; and an imaging element; an observation mode setting section configured to set an object observation mode as a distant observation mode or a close observation mode; a diaphragm control section configured to select a diaphragm state of the imaging optical system based on the observation mode set by the observation mode setting section; and an image processing section configured to process an image acquired by the imaging section, wherein the diaphragm control section is configured to select a first diaphragm state when the observation mode is the distant observation mode, the first diaphragm state being a state in which a resolution determined by a diffraction limit based on a diaphragm of the imaging optical system is lower than a resolution determined by the imaging element, wherein the diaphragm control section is configured to select a second diaphragm state when the observation mode is the close observation mode, the second diaphragm state being a state in which the resolution determined by the diffraction limit based on the diaphragm of the imaging optical system is equal to or higher than the resolution determined by the imaging element, and wherein the image processing section is configured to reduce high-frequency components in the image acquired by the imaging section when the observation mode is the distant observation mode as compared with a case where the observation mode is the close observation mode.