PURPOSE: To correct the parallax of a finder easily by rotating polarizing prisms which are provided rotatably on the front surface of a lens system associatively with the movement of the lens system of an AF device.

CONSTITUTION: The polarizing prisms 5 and 6 provided in front of the lens system 4 are held rotatably by frames 7 and 8 having gears 9 and 10, and the frames 7 and 8 are rotated in the opposite directions by gears 12 and 13 for prism rotation to perform deflection according to their angle of rotation. The extent of deflection of the prism by the gear 12 which rotates corresponding to the amount of operation of a focus adjustment by an AF device corresponds to the parallax of the finder 2 to the distance up to a subject on photography. Thus, the parallax is corrected easily.