High-aperture-ratio inner-focus telephoto lens

Details High-aperture-ratio inner-focus telephoto lens High-aperture-ratio inner-focus telephoto lens

1993-12-16

1996-02-06

Sugarman, Scott J.

Optical: systems and elements

Lens

Telephoto

359746, 359748, 359557, G02B 1302

Patent

active

054900140

ABSTRACT:
A high-aperture-ratio inner-focus telephoto lens comprises a first lens group of positive refracting power, a second lens group of negative refracting power and a third lens group of positive refracting power arranged in the named order from the object side, in which the first lens group and the second lens group form a substantially afocal system, focusing is effected by moving the second lens group along the optical axis, and the first lens group has a front group of positive refracting power and a rear group of weak positive refracting power arranged in the named order from the object side.

REFERENCES:
patent: 4610514 (1986-04-01), Nakamura
patent: 5323270 (1994-06-01), Sato
patent: 5325234 (1994-06-01), Yoneyama

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