High speed focusing telephoto lens

Details High speed focusing telephoto lens High speed focusing telephoto lens

1976-04-19

1978-01-17

Sacher, Paul A.

350177, 350216, G02B 960, G02B 962

Patent

active

040689298

ABSTRACT:
This invention is directed to a telephoto lens. The telephoto lens comprises a positive front lens group which remains stationary during focusing and a negative rear lens group having a stationary sub-group and at least one movable sub-group. The movable sub-group has a positive refracting power with its front surface being convex toward the object. The stationary sub-group has a negative refracting power with its rear surface being concave toward the image. The movable sub-group is moved on the optical axis toward an object so as to cause said telephoto lens to focus an object at near distance from its focusing on an object at far distance.

REFERENCES:
patent: 3854797 (1974-12-01), Yokota

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