Imaging apparatus

An imaging apparatus, comprising:

• a viewfinder optical system adaptable to guide, toward a viewfinder window, a monitoring luminous flux, which is included in a luminous flux received from an optical imaging system, specifically, a luminous flux having been reflected from a main reflective surface;
• a first image sensor for generating an image signal by detecting the monitoring luminous flux;
• a photometric sensor;
• and
• optical path changing means adaptable to change an optical path,
• wherein:
• the viewfinder optical system has a first reflective surface that reflects the monitoring luminous flux,
• the first reflective surface is adaptable to change a reflection angle of the monitoring luminous flux,
• a change in the reflection angle of the first reflective surface causes a course of the monitoring luminous flux to be switched between a first optical path reflected from the first main reflective surface toward the viewfinder window and a second optical path reflected from the first reflective surface toward the first image sensor,
• when the course of the monitoring luminous flux takes the second optical path, a travel direction of the second optical path is changed with the optical path changing means placed on the second optical path, causing a photometric processing to be performed using the first image sensor placed on the second optical path resulting from the change in the travel direction, and
• when the course of the monitoring luminous flux takes the first optical path, the photometric processing is performed using the photometric sensor placed in the vicinity of the first optical path.