Patent ID: 8439579

Claim:
A single-reflex camera comprising: a mirror box configured to house a mirror configured to deflect part of a light flux that has passed through an image-pickup optical system when the mirror is inserted into an optical path of the light flux; and a focus detecting unit that includes a condenser lens configured to condense a light flux deflected by the mirror, and provides focus detections using light condensed by the condenser lens and a phase difference method, wherein the mirror box further includes: a first opening, arranged to allow the light flux that has passed through the image-pickup optical system to enter the mirror box; a bottom plate arranged between the mirror and the focus detecting unit, the bottom plate including a front part that inclines towards an optical axis of the image-pickup optical system as it extends away from the first opening, and wherein part of the condenser lens is located on a side of the optical axis of the image-pickup optical system with respect to a line extending from a bottom end of the first opening parallel to the optical axis of the image-pickup optical system wherein the bottom end of the first opening is the end of the first opening closest to the bottom plate, wherein the bottom plate further includes: a plate-shaped center part positioned further away from the image-pickup optical system than the front part, wherein the center part is the closest part of the bottom plate to the optical axis; and a plate-shaped back part that inclines away from the optical axis as it extends away from the center part.