Zoom lens and imaging apparatus including the same

Details Zoom lens and imaging apparatus including the same Zoom lens and imaging apparatus including the same

2007-07-24

2007-07-24

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S715000, C359S774000

Reexamination Certificate

active

11393187

ABSTRACT:
At least one exemplary embodiment is directed to a zoom lens which includes a first lens group, which can have a positive refracting power; a second lens group, which can have a negative refracting power, and can move during zooming; a third lens group, which can have a positive refracting power; and a fourth lens group, which can have a positive refracting power, and can move during zooming, the lens groups being aligned in order from front to back, where the focal lengths fw and ft of the whole system at a wide-angle end and at a telescopic end, respectively, can satisfy the following conditions:in-line-formulae description="In-line Formulae" end="lead"?0.15<fw/f4 <0.26in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?1.0<f3/(fw·ft)1/2<1.2.in-line-formulae description="In-line Formulae" end="tail"?

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