Patent ID: 7877006

Claim:
A focus information display system comprising: a focus state display device that displays whether a focus state of an optical system that forms an subject image is a correct focus state or an out-of-focus state; a first correct focus determination device that determines, in the event that an out-of-focus display indicating an out-of-focus state is performed by the focus state display device, whether a focus state of the optical system is a correct focus state or an out-of-focus state; a second correct focus determination device that determines, in the event that a correct focus display indicating a correct focus state is performed by the focus state display device, whether a focus state of the optical system is a correct focus state or an out-of-focus state, wherein a determination of a correct focus state is made in a focus position range that is wider than the focus position range in which the first correct focus determination device determines a correct focus state; and a display switching device that switches the focus state display device to a correct focus display when the first correct focus determination device determines a correct focus state in the event that an out-of-focus display is performed by the focus state display device, and switches the focus state display device to an out-of-focus display when the second correct focus determination device determines an out-of-focus state in the event that a correct focus display is performed by the focus state display device.