High zoom-ratio zoom lens system

Details High zoom-ratio zoom lens system High zoom-ratio zoom lens system

2009-08-04

2010-10-12

Sugarman, Scott J (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S676000

Reexamination Certificate

active

07813051

ABSTRACT:
A high zoom-ratio zoom lens system of five lens groups includes a positive first lens group, a negative second lens group, a positive third lens group, a positive fourth lens group, and a negative fifth lens group, in this order from the object.Upon zooming from the short focal length extremity to the long focal length extremity, a distance between the first lens group and the second lens group increases, and a distance between the second lens group and the third lens group decreases.The high zoom-ratio zoom lens system satisfies the following conditions:in-line-formulae description="In-line Formulae" end="lead"?5.5<f1/|f2|<10.0(f2<0)  (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?1.7<f3/f4<4.0  (2)in-line-formulae description="In-line Formulae" end="tail"?whereinf1designates the focal length of the first lens group;f2designates the focal length of the second lens group;f3designates the focal length of the third lens group; andf4designates the focal length of the fourth lens group.

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