Focus detection device and method of adjusting focus detection device comprising independent pupil adjustment of moveable field lenses

摘要

In order to obtain a focus detection device that can perform pupil adjustment accurately in all of a plurality of focus detection areas, field lenses corresponding to each focus detection area in a focus detection device having a plurality of focus detection areas are comprised of separate materials for each focus detection area, and independent adjustment of the eccentricity of the field lens corresponding to each focus detection area is made possible in the plane perpendicular to the optical axis of each field lens so that pupil adjustment can be performed independently for each of the plurality of focus detection areas.