Wide angle lens system having short overall length

Details Wide angle lens system having short overall length Wide angle lens system having short overall length

1986-03-12

1987-06-16

Corbin, John K.

G02B 960

Patent

active

046732594

ABSTRACT:
This invention relates to a wide angle lens system having small telephoto ratio. The strong curvature of a negative lens group arranged on the image side, which is the characteristic of the lens system of this type, is eased by composing the negative lens group as a doublet. This structure maintains the spacing between the front lens group and the rear lens group to be small.
The negative lens group on the image side comprises two negative meniscus lenses, which have surfaces having stronger curvature facing each other.

REFERENCES:
patent: 3516734 (1970-06-01), Schmidt
patent: 3951524 (1976-04-01), Doi et al.
patent: 4183626 (1980-01-01), Rogers

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