Patent ID: 6392804
Filing Date: 2002-05-21
Classification: G02B

Abstract:
An image-blur correcting viewing-optical system comprising an objective optical system, an image-erecting optical system and an eyepiece optical system;wherein said objective optical system comprises an image-blur correcting lens element which is driven in a direction perpendicular to an optical axis; and wherein said image-blur correcting lens element satisfies the following condition: 1 mm&lE;&phgr;âˆ’&phgr;0&lE;3 mm wherein&phgr; designates a mechanical diameter of said image-blur correcting lens element; and &phgr;0 designates a diameter of an axial open aperture of a first surface of said image-blur correcting lens element, wherein the objective optical system, the image erecting optical system, and the eyepiece optical system define a telescope.