Telephoto lens with large relative aperture

Details Telephoto lens with large relative aperture Telephoto lens with large relative aperture

1978-04-27

1979-12-04

Sacher, Paul A.

350177, 350215, G02B 962, G02B 964

Patent

active

041769139

ABSTRACT:
A telephoto lens with large relative aperture comprises a first converging lens group, a diverging lens group and a second converging lens group arranged in this order as viewed from the object side. The first converging lens group has two positive lens components and a negative lens component spaced from each other by an air space, the group remaining fixed when focusing. The diverging lens group has a cemented negative lens component and a negative lens component with an air space therebetween which is larger than the sum of the center thickness of the former component and the center thickness of the latter component. The second converging lens group comprises a cemented lens component and remains fixed when focusing. The first converging lens group and the diverging lens group virtually form an afocal system for an object at infinity. The diverging lens group is movable along the optical axis toward the image side for focusing upon an object at a shorter distance and also toward the object side for focusing upon an object at a longer distance.

REFERENCES:
patent: 4113357 (1978-09-01), Nakamura
patent: 4126378 (1978-11-01), Ogino

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