Compact zoom lens having a large aperture and good aberation cor

Details Compact zoom lens having a large aperture and good aberation cor Compact zoom lens having a large aperture and good aberation cor

1983-11-16

1988-06-07

Corbin, John K.

350423, G02B 1514

Patent

active

047492660

ABSTRACT:
A zoom lens including, from front to rear, a first lens group of positive power, a second lens group of negative power, a third lens group of positive power, a fourth lens group of negative power, and a fifth lens group of positive power. For zooming from the shortest focal length to the longest focal length, the first lens group is moved forward, the air space between the first and second lens groups is increased, the air space between the second and the third lens groups is decreased, the air space between the third and fourth lens groups is increased, and the air space between the fourth and fifth lens groups is decreased. The fifth lens group remains stationary during zooming. This construction and arrangement results in a zoom lens of compact form with a large aperture while still permitting good stability of aberration correction throughout a greatly extended zooming range.

REFERENCES:
patent: 3512872 (1970-05-01), Lynch et al.
patent: 4437732 (1984-03-01), Ishiyama
patent: 4501475 (1985-02-01), Fujita et al.

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