An apparatus includes a body accommodating an imaging plane, and a lens device providing a light beam path and including lens units arranged along and coaxially with the path. The second lens unit next to the most outwardly located first lens unit is reciprocally rotational between a first position, at which the second lens unit is coaxial with the path, and a second position, at which the second lens unit is positioned away from the path. The first lens unit is provided on a cylindrical unit and is reciprocally movable with the cylindrical unit along the optical axis, and is moved to approach the plane while the second lens unit is in the second position to shorten a distance between the first lens unit and the plane in comparison with the distance between the first lens unit and the plane when the second lens unit is in the first position.