Patent ID: 6057962
Filing Date: 2000-05-02
Classification: G02B

Abstract:
An observation optical system having a front portion through which light enters, the optical system comprising:at least one telescopic optical system having a plurality of optical elements, said plurality of optical elements being arranged such that said observation optical system has a horizontally extending first optical axis passing through said front portion, and a vertically extending second optical axis when said observing optical system is held horizontally by a user;a first compensation optical system that is moved to shift an optical path of light passed through said first compensation optical system to compensate trembling of image due to hand vibration applied to said observation optical system in a horizontal direction when said observation optical system is held horizontally; anda second compensation optical system that is moved to shift an optical path of light passed through said second compensation optical system to compensate trembling of image due to hand vibration applied to said observation optical system in a vertical direction when said observation optical system is held horizontally,said first compensation optical systems being arranged such that said first optical axis intersects said first compensation optical system,said second compensation optical system being arranged to such that said second optical axis intersects said second compensation optical system, said second compensation optical system comprising a rotatable member which is rotatable about an axis extending parallel to said second optical axis, said rotatable member being equally balanced at said second optical axis.