Zoom lens and image pickup apparatus

Details Zoom lens and image pickup apparatus Zoom lens and image pickup apparatus

2007-12-25

2007-12-25

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S684000

Reexamination Certificate

active

11526640

ABSTRACT:
The present invention provides a zoom lens provided with, in order from an object side: a first lens group having a positive refractive power whose position on the optical axis is fixed during a zooming operation and a focusing operation; a second lens group having a negative refractive power; a third lens group having a positive refractive power; a fourth lens group having a positive refractive power; a fifth lens group having a negative refractive power; and a sixth lens group having a positive refractive power. The first lens group includes a reflection optical element. At least the fifth lens group is used for focusing on an object at a finite distance. The maximum lateral magnification of the predetermined lens groups between a wide-angle end and a telephoto end of the zoom lens and focal lengths of the zoom lens satisfy a predetermined condition.

REFERENCES:
patent: 2007/0070513 (2007-03-01), Yamashita et al.

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