Large relative aperture telephoto lens system

Details Large relative aperture telephoto lens system Large relative aperture telephoto lens system

1982-07-26

1984-07-03

Corbin, John K.

350457, G02B 1302

Patent

active

044575955

ABSTRACT:
A large relative aperture telephoto lens system comprising a first converging lens group consisting of four positive, positive, negative and positive lens components, a diverging lens group consisting of two negative cemented doublets, and a second converging lens group consisting of a positive lens component and a cemented doublet composed of a negative lens element and a positive lens element.
Said lens system is so adapted as to perform focusing and correction of aberrations by displacing the two negative lens components in said diverging lens group and said second lens group as a whole independently along the optical axis while changing relative airspaces, maintains high performance within a range from infinity to short distances and assures high operability for focusing.

REFERENCES:
patent: 3854797 (1974-12-01), Yokota
patent: 4045128 (1977-08-01), Momiyama
patent: 4157211 (1979-06-01), Tanaka et al.
patent: 4176913 (1979-12-01), Nakamura et al.

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