Lens system enabling close distance photographing

Details Lens system enabling close distance photographing Lens system enabling close distance photographing

1990-04-23

1991-04-16

Sugarman, Scott J.

350428, G02B 964, G02B 1522

Patent

active

050077201

ABSTRACT:
A lens system enabling close distance photographing has an excellent image forming performance for a wide focussing range from infinite distance to equi-magnification distance while employing a relatively simple lens composition. The lens system has a basic composition including a 1st group of positive refractive power, a 2nd group of positive refractive power and a 3rd group of negative refractive power arranged in this order from the object side and in focussing from infinite distance to closest distance, the 1st group and the 2nd group move to the object side away from the 3rd group, which is fixed relative to the image plane, while expanding the space between the 1st and the 2nd groups, the 3rd negative group has a positive lens and a negative lens arranged in this order from the object side.

REFERENCES:
patent: 4392724 (1983-07-01), Hamanishi
patent: 4464023 (1984-08-01), Kato et al.
patent: 4571033 (1986-02-01), Kato et al.
patent: 4592626 (1986-06-01), Fujii
patent: 4786153 (1988-11-01), Ogata

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