Patent ID: 6335827
Filing Date: 2002-01-01
Classification: G02B

Abstract:
A real image mode variable magnification finder, comprising:an objective optical system having positive refracting power; an image erecting optical system; and an ocular optical system having positive refracting power, said objective optical system having, in order from an object side, a first lens unit with negative refracting power, a second lens unit with negative refracting power, a third lens unit with positive refracting power, and a fourth lens unit with negative refracting power, wherein, when a magnification of said finder is changed, a plurality of lens units including said third lens unit are moved, a distance between said second lens unit and said third lens unit is changed so as to be shorter in an intermediate position than in a wide-angle position and much shorter in a telephoto position than in the intermediate position, and a distance between said first lens unit and said second lens unit is changed so as to be shorter in the intermediate position than in the wide-angle position and to be much shorter in the telephoto position than in the intermediate position.