Wide magnification-variable range zoom lens system

Details Wide magnification-variable range zoom lens system Wide magnification-variable range zoom lens system

1981-06-03

1984-03-20

Corbin, John K.

G02B 1514

Patent

active

044377320

ABSTRACT:
A wide magnification-variable range zoom lens system having a short total length and a small diameter permitting zooming from the wide angle to a long focal length comprises five lens groups having positive, negative, positive, negative and positive focal lengths respectively, a partial lens system consisting of said first and second lens group having a negative focal length over the entire zooming region, a partial lens system consisting of said third through fifth lens groups having a positive focal length, all of said lens groups moving along the optical axis to contribute to the variation of focal length of said zoom lens system, and said first lens group widely moving toward the object side when total focal length of the zoom lens system varies from the shortest to the longest.

REFERENCES:
patent: 3185029 (1965-05-01), Peck et al.

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