A finder apparatus according to a first aspect of the present invention includes an optical finder for observing an optical image of a subject using an eyepiece portion, a display device that displays information, a half mirror that is arranged on an optical path of the optical finder, an electronically variable ND filter that is inserted on a subject side from the half mirror on the optical path of the optical finder, a brightness information acquisition unit that acquires brightness information of external light, a brightness measurement unit that measures brightness of the incident external light, and a transmittance calculation unit that calculates transmittance of the electronically variable ND filter in real time based on the measured brightness and the acquired brightness information.