Patent ID: 7561343

Claim:
An electronic image pickup apparatus comprising: a zoom lens system which forms an image of an object; and an electronic image pickup device which receives the image formed by the zoom lens system to convert the image into an electric signal, the zoom lens system comprising: a plurality of lens units arranged along an optical path including an optical axis which extends from an object side to an image surface, each space between the plurality of lens units which are adjacent to each other being changed to change a focal length of the zoom lens system, among the plurality of lens units, a first lens unit which is a lens unit arranged closest to an object side comprising a reflective surface which reflects the optical path, the zoom lens system further comprising: an aperture stop having an aperture which is disposed on the optical path reflected by the reflective surface of the first lens unit, the aperture of the aperture stop having a non-circular shape in a state in which an area of the aperture is maximized, in the state in which the area of the aperture is maximized, a length of the aperture in a direction along an incident optical axis that enters the first lens unit being smaller than a length of the aperture in a direction vertical to the incident optical axis that enters the first lens unit and a reflected optical axis reflected by the reflective surface, a lens arranged closest to an image side on the optical path extending from the reflective surface to the image surface having a non-circular outer shape, the outer shape of the lens being formed so that a length of the outer shape in the direction along the incident optical axis which enters the first lens unit being smaller than the length of the outer shape in the direction vertical to the incident optical axis which enters the first lens unit and the reflected optical axis reflected by the reflective surface, the following condition being satisfied: 1.10< D x /D y <1.75 (1), in which D y is a length of the aperture in the direction along the incident optical axis that enters the first lens unit in the state where the area of the aperture is maximized, and D x is a length of the aperture in the direction vertical to the incident optical axis that enters the first lens unit and the reflected optical axis reflected by the reflective surface of the first lens unit in the state where the area of the aperture is maximized.