Imaging apparatus, finder display control method of imaging apparatus, finder display control program of imaging apparatus, and viewfinder

A non-transitory and computer-readable recording medium, the recording medium for causing a computer to execute, in a case where instructions stored in the recording medium are read by the computer,

• a finder display control function of an imaging apparatus including an optical finder through which an optical image of a subject is observed, a display, a superimposing optical element that is disposed in an optical path of the optical finder so as to superimpose displaying by the display on the optical image of the subject observed through the optical finder, and an electronic variable ND filter that is disposed in an optical path of the optical finder so as to adjust a light amount of the optical image of the subject incident into the superimposing optical element, the function including:
• a function of acquiring information about a result of measurement of a transmittance of the electronic variable ND filter changing over time in a case where the transmittance of the electronic variable ND filter is switched;
• and
• a function of controlling the light amount of the display on the basis of a result of measurement of the transmittance so as to keep constant a light amount ratio of the optical image of the subject observed through the optical finder and the displaying by the display superimposed on the optical image.

A viewfinder comprising:

• an observation optical system through which an optical image of a subject incident through the finder window from the eyepiece is observed;
• a display;
• a superimposing optical element that is disposed in an optical path of the observation optical system so as to superimpose displaying by the display on the optical image of the subject observed through the observation optical system;
• an electronic variable ND filter that is disposed in an optical path of the observation optical system so as to adjust a light amount of the optical image of the subject incident into the superimposing optical element;
• a transmittance measurer that measures a transmittance of the electronic variable ND filter changing over time in a case where the transmittance of the electronic variable ND filter is switched;
• and
• a processor that controls a light amount of the display on the basis of a result of measurement of the transmittance measurer so as to keep constant a light amount ratio of the optical image of the subject observed through the observation optical system and the displaying by the display superimposed on the optical image.