A real image mode variable magnification finder optical system comprises a variable
magnification objective optical system having a positive optical power, an ocular
optical system having a positive optical power, and a plurality of reflecting surfaces
for erecting an image. The objective optical system comprises a plurality of movable
lens units and at least one rotationally asymmetric reflecting surface having an
optical power, and the reflecting surface participating in the function of the
objective optical system and in the function of erecting an image. Each of the
lens unit included in the objective optical system has at least one aspherical
surface. The finder optical system satisfies the following condition:
0.02d(fw/ft2)0.4.
where d is a distance from a first surface of the objective optical system
to one of the reflecting surfaces positioned nearest to an object measured along
an axial chief ray at a wide angle end, fw is a focal length of the objective optical
system at a wide angle end, and ft is a focal length of the objective optical system
at a telephoto end.