Image-blur correcting viewing-optical system
AssigneePENTAX Corporation
InventorTakaaki Yano
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Abstract
An image-blur correcting viewing-optical system includes an objective optical system, an image-erecting optical system and an eyepiece optical system. The objective optical system includes a front lens group having a positive lens element, a negative lens element and a positive lens element, and a rear lens group constituting an image-blur correcting lens element which is driven in a direction perpendicular to the optical axis; and the image-blur correcting viewing-optical system satisfies the following condition: 0.5≦hc/hmax≦0.8 (1) wherein hc designates the radius of an axial open aperture of the first surface of the image-blur correcting lens element; and hmax designates the radius of an axial open aperture of the first surface of the front lens group of the objective optical system.
Claims3
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 a front lens group comprising a positive lens element, a negative lens element and a second positive lens element, and a rear lens group comprising an image-blur correcting lens element which is driven in a direction perpendicular to the optical axis, in this order from an object;
- and
- wherein said image-blur correcting viewing-optical system satisfies the following condition:
- 0.5≦hc/hmax≦0.8
- wherein
- hc designates the radius of an axial open aperture of the first surface of said image-blur correcting lens element;
- and
- hmax designates the radius of an axial open aperture of the first surface of said front lens group of said objective optical system.
Dependencies are inferred from the claim text.