An optical apparatus has an imaging optical system provided with a
deformable mirror and an electronic zoom function that an image recorded
in an image sensor by the imaging optical system is magnified by image
processing. A ray deflecting function of the deformable mirror is changed
in accordance with a change of an object area corresponding to an image
to be used, and aberration of the imaging optical system is optimized.
The deformable mirror is controlled by an arithmetical unit connected to
an image processor and a driving circuit. The electronic zoom is
performed with respect to the image recorded in the image sensor through
a signal processing circuit and the image processor, and when the image
is displayed on a display device, the deformable mirror is deformed so
that sharpness at nearly the center of an object image formed on the
image sensor is improved. This offers the optical apparatus in which a
compact design is achieved, the magnification of the optical system can
be changed, and the sharpness of the image is high even when a variable
magnification ratio is increased.