Large aperture medium telephoto lens system

Details Large aperture medium telephoto lens system Large aperture medium telephoto lens system

1994-12-27

1997-06-17

Sugarman, Scott J.

Optical: systems and elements

Lens

Multiple component lenses

359684, 359746, 359748, G02B 912, G02B 1514, G02B 1302

Patent

active

056402775

ABSTRACT:
The lens system includes, in order from an object side, a 1-st lens unit having a positive refractive power which has at least two positive lens elements and a negative lens element positioned on an image side of said positive lens elements, a 2-nd lens unit having a positive refractive power and a 3-rd lens unit having a positive refractive power. During focusing, both 1-st and 3-rd lens units are fixed, whereas the 2-nd lens unit is movable along an optical axis. The lens system satisfies at least one of the conditions 1.8<F1/f<2.4 and 0.8<F2/f<0.96.

REFERENCES:
patent: 4812027 (1989-03-01), Yanagisawa
patent: 4848883 (1989-07-01), Maruyama
patent: 4991943 (1991-02-01), Betensky
patent: 5172274 (1992-12-01), Hirakawa
patent: 5272564 (1993-12-01), Suzuki et al.

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