Zoom lens system

Details Zoom lens system Zoom lens system

2005-07-26

2005-07-26

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

Reexamination Certificate

active

06922290

ABSTRACT:
A zoom lens system includes a positive first lens group, a negative second lens group. Zooming is performed by moving the first and second lens groups in the optical axis direction thereof. The most image-side lens element of the positive first lens group includes a positive lens element having at least one aspherical surface. The zoom lens system satisfies the following conditions:in-line-formulae description="In-line Formulae" end="lead"?4.5<fT/f1G<5.5   (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?3.5<fT/fLasp<5.5   (2)in-line-formulae description="In-line Formulae" end="tail"?whereinfTdesignates the focal length of the zoom lens system at the long focal length extremity;f1Gdesignates the focal length of the positive first lens group; andfLaspdesignates the focal length of the positive lens element having the aspherical surface in the positive first lens group.

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