Large-aperture ratio telephoto lens system

Details Large-aperture ratio telephoto lens system Large-aperture ratio telephoto lens system

1984-06-25

1985-07-09

Corbin, John K.

350457, G02B 1302

Patent

active

045278687

ABSTRACT:
A high performance large aperture ratio telephoto lens system having a focal length of 200 mm to 300 mm, aperture ratio of 1:2.0 and low telephoto ratio and comprising a first converging lens group, a diverging lens group and a second converging lens group; said first converging lens group consisting of three positive, positive and negative lens components, said diverging lens group consisting of three lens components, i.e., a positive meniscus lens component, a negative meniscus lens component and a negative cemented doublet, and said second converging lens group comprising at least a cemented doublet consisting of a negative element and a positive element.

REFERENCES:
patent: 3854797 (1974-12-01), Yokota
patent: 4045128 (1977-08-01), Momiyama
patent: 4176913 (1979-12-01), Nakamura et al.
patent: 4348084 (1983-09-01), Kitagishi et al.

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