Zoom lens system and camera having same

Details Zoom lens system and camera having same Zoom lens system and camera having same

2008-05-22

2008-12-30

Thompson, Timothy J (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S686000

Reexamination Certificate

active

07471460

ABSTRACT:
A zoom lens system includes, in order from an object side to an image side, a first lens unit having positive optical power, a second lens unit having negative optical power, a third lens unit having positive optical power, and a fourth lens unit having positive optical power. Each lens unit moves during zooming. In particular, the first lens unit moves so as to be closer to an object at a telephoto end than at a wide-angle end during zooming, and the fourth lens unit moves in a locus convex toward the object side during zooming. The sharing of magnification variation between the third lens unit and the fourth lens unit is appropriately set.

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